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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="A way to create simple reusable template components in Django."><link href=https://emilstenstrom.github.io/django-components/latest/concepts/fundamentals/html_attributes/ rel=canonical><link href=../slots/ rel=prev><link href=../defining_js_css_html_files/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.5.50"><title>HTML attributes - Django-Components</title><link rel=stylesheet href=../../../assets/stylesheets/main.a40c8224.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.06af60db.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style><link rel=stylesheet href=../../../assets/_markdown_exec_pyodide.css><link rel=stylesheet href=../../../assets/_mkdocstrings.css><link rel=stylesheet href=../../../css/timeago.css><link rel=stylesheet href=../../../css/style.css><script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script><meta property=og:type content=website><meta property=og:title content="HTML attributes - Django-Components"><meta property=og:description content="A way to create simple reusable template components in Django."><meta property=og:image content=https://emilstenstrom.github.io/django-components/latest/assets/images/social/concepts/fundamentals/html_attributes.png><meta property=og:image:type content=image/png><meta property=og:image:width content=1200><meta property=og:image:height content=630><meta content=https://emilstenstrom.github.io/django-components/latest/concepts/fundamentals/html_attributes/ property=og:url><meta name=twitter:card content=summary_large_image><meta name=twitter:title content="HTML attributes - Django-Components"><meta name=twitter:description content="A way to create simple reusable template components in Django."><meta name=twitter:image content=https://emilstenstrom.github.io/django-components/latest/assets/images/social/concepts/fundamentals/html_attributes.png></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#removing-atttributes class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <div data-md-color-scheme=default data-md-component=outdated hidden> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title=Django-Components class="md-header__button md-logo" aria-label=Django-Components data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> Django-Components </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> HTML attributes </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media=(prefers-color-scheme) data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="m14.3 16-.7-2h-3.2l-.7 2H7.8L11 7h2l3.2 9zM20 8.69V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12zm-9.15 3.96h2.3L12 9z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: 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light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-component=search role=dialog> <label class=md-search__overlay for=__search></label> 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244.8 8M97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </div> <div class=md-source__repository> EmilStenstrom/django-components </div> </a> </div> <ul class=md-nav__list data-md-scrollfix> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_1> <label class=md-nav__link for=__nav_1 id=__nav_1_label tabindex=0> <span class=md-ellipsis> Overview </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_1_label aria-expanded=false> <label class=md-nav__title for=__nav_1> <span class="md-nav__icon md-icon"></span> Overview </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../overview/welcome/ class=md-nav__link> <span class=md-ellipsis> Welcome to Django Components </span> </a> </li> <li class=md-nav__item> <a href=../../../overview/compatibility/ class=md-nav__link> <span class=md-ellipsis> Compatibility </span> </a> </li> <li class=md-nav__item> <a href=../../../overview/installation/ class=md-nav__link> <span class=md-ellipsis> Installation </span> </a> </li> <li class=md-nav__item> <a href=../../../overview/security_notes/ class=md-nav__link> <span class=md-ellipsis> Security notes 🚨 </span> </a> </li> <li class=md-nav__item> <a href=../../../overview/community/ class=md-nav__link> <span class=md-ellipsis> Community </span> </a> </li> <li class=md-nav__item> <a href=../../../overview/contributing/ class=md-nav__link> <span class=md-ellipsis> Contributing </span> </a> </li> <li class=md-nav__item> <a href=../../../overview/development/ class=md-nav__link> <span class=md-ellipsis> Development </span> </a> </li> <li class=md-nav__item> <a href=../../../overview/code_of_conduct/ class=md-nav__link> <span class=md-ellipsis> Code of Conduct </span> </a> </li> <li class=md-nav__item> <a href=../../../overview/license/ class=md-nav__link> <span class=md-ellipsis> License </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_2> <label class=md-nav__link for=__nav_2 id=__nav_2_label tabindex=0> <span class=md-ellipsis> Getting Started </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_2_label aria-expanded=false> <label class=md-nav__title for=__nav_2> <span class="md-nav__icon md-icon"></span> Getting Started </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../getting_started/your_first_component/ class=md-nav__link> <span class=md-ellipsis> Create your first component </span> </a> </li> <li class=md-nav__item> <a href=../../../getting_started/adding_js_and_css/ class=md-nav__link> <span class=md-ellipsis> Adding JS and CSS </span> </a> </li> <li class=md-nav__item> <a href=../../../getting_started/components_in_templates/ class=md-nav__link> <span class=md-ellipsis> Components in templates </span> </a> </li> <li class=md-nav__item> <a href=../../../getting_started/parametrising_components/ class=md-nav__link> <span class=md-ellipsis> Parametrising components </span> </a> </li> <li class=md-nav__item> <a href=../../../getting_started/adding_slots/ class=md-nav__link> <span class=md-ellipsis> Adding slots </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_3 checked> <label class=md-nav__link for=__nav_3 id=__nav_3_label tabindex> <span class=md-ellipsis> Concepts </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_3_label aria-expanded=true> <label class=md-nav__title for=__nav_3> <span class="md-nav__icon md-icon"></span> Concepts </label> <ul class=md-nav__list data-md-scrollfix> <li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_3_1 checked> <label class=md-nav__link for=__nav_3_1 id=__nav_3_1_label tabindex> <span class=md-ellipsis> Fundamentals </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_3_1_label aria-expanded=true> <label class=md-nav__title for=__nav_3_1> <span class="md-nav__icon md-icon"></span> Fundamentals </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../single_file_components/ class=md-nav__link> <span class=md-ellipsis> Single-file components </span> </a> </li> <li class=md-nav__item> <a href=../components_in_python/ class=md-nav__link> <span class=md-ellipsis> Components in Python </span> </a> </li> <li class=md-nav__item> <a href=../access_component_input/ class=md-nav__link> <span class=md-ellipsis> Accessing component inputs </span> </a> </li> <li class=md-nav__item> <a href=../component_context_scope/ class=md-nav__link> <span class=md-ellipsis> Component context and scope </span> </a> </li> <li class=md-nav__item> <a href=../template_tag_syntax/ class=md-nav__link> <span class=md-ellipsis> Template tag syntax </span> </a> </li> <li class=md-nav__item> <a href=../slots/ class=md-nav__link> <span class=md-ellipsis> Slots </span> </a> </li> <li class="md-nav__item md-nav__item--active"> <input class="md-nav__toggle md-toggle" type=checkbox id=__toc> <label class="md-nav__link md-nav__link--active" for=__toc> <span class=md-ellipsis> HTML attributes </span> <span class="md-nav__icon md-icon"></span> </label> <a href=./ class="md-nav__link md-nav__link--active"> <span class=md-ellipsis> HTML attributes </span> </a> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#removing-atttributes class=md-nav__link> <span class=md-ellipsis> Removing atttributes </span> </a> </li> <li class=md-nav__item> <a href=#boolean-attributes class=md-nav__link> <span class=md-ellipsis> Boolean attributes </span> </a> </li> <li class=md-nav__item> <a href=#default-attributes class=md-nav__link> <span class=md-ellipsis> Default attributes </span> </a> </li> <li class=md-nav__item> <a href=#appending-attributes class=md-nav__link> <span class=md-ellipsis> Appending attributes </span> </a> </li> <li class=md-nav__item> <a href=#rules-for-html_attrs class=md-nav__link> <span class=md-ellipsis> Rules for html_attrs </span> </a> </li> <li class=md-nav__item> <a href=#examples-for-html_attrs class=md-nav__link> <span class=md-ellipsis> Examples for html_attrs </span> </a> </li> <li class=md-nav__item> <a href=#full-example-for-html_attrs class=md-nav__link> <span class=md-ellipsis> Full example for html_attrs </span> </a> </li> <li class=md-nav__item> <a href=#rendering-html-attributes-outside-of-templates class=md-nav__link> <span class=md-ellipsis> Rendering HTML attributes outside of templates </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../defining_js_css_html_files/ class=md-nav__link> <span class=md-ellipsis> Defining HTML / JS / CSS files </span> </a> </li> <li class=md-nav__item> <a href=../autodiscovery/ class=md-nav__link> <span class=md-ellipsis> Autodiscovery </span> </a> </li> <li class=md-nav__item> <a href=../components_as_views/ class=md-nav__link> <span class=md-ellipsis> Components as views </span> </a> </li> <li class=md-nav__item> <a href=../subclassing_components/ class=md-nav__link> <span class=md-ellipsis> Subclassing components </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_3_2> <label class=md-nav__link for=__nav_3_2 id=__nav_3_2_label tabindex> <span class=md-ellipsis> Advanced </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_3_2_label aria-expanded=false> <label class=md-nav__title for=__nav_3_2> <span class="md-nav__icon md-icon"></span> Advanced </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../advanced/rendering_js_css/ class=md-nav__link> <span class=md-ellipsis> Rendering JS / CSS </span> </a> </li> <li class=md-nav__item> <a href=../../advanced/html_tragments/ class=md-nav__link> <span class=md-ellipsis> HTML fragments </span> </a> </li> <li class=md-nav__item> <a href=../../advanced/provide_inject/ class=md-nav__link> <span class=md-ellipsis> Prop drilling and provide / inject </span> </a> </li> <li class=md-nav__item> <a href=../../advanced/hooks/ class=md-nav__link> <span class=md-ellipsis> Lifecycle hooks </span> </a> </li> <li class=md-nav__item> <a href=../../advanced/component_registry/ class=md-nav__link> <span class=md-ellipsis> Registering components </span> </a> </li> <li class=md-nav__item> <a href=../../advanced/typing_and_validation/ class=md-nav__link> <span class=md-ellipsis> Typing and validation </span> </a> </li> <li class=md-nav__item> <a href=../../advanced/template_tags/ class=md-nav__link> <span class=md-ellipsis> Custom template tags </span> </a> </li> <li class=md-nav__item> <a href=../../advanced/tag_formatter/ class=md-nav__link> <span class=md-ellipsis> Tag formatters </span> </a> </li> <li class=md-nav__item> <a href=../../advanced/authoring_component_libraries/ class=md-nav__link> <span class=md-ellipsis> Authoring component libraries </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_4> <label class=md-nav__link for=__nav_4 id=__nav_4_label tabindex=0> <span class=md-ellipsis> Guides </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_4_label aria-expanded=false> <label class=md-nav__title for=__nav_4> <span class="md-nav__icon md-icon"></span> Guides </label> <ul class=md-nav__list data-md-scrollfix> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_4_1> <label class=md-nav__link for=__nav_4_1 id=__nav_4_1_label tabindex=0> <span class=md-ellipsis> Setup </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_1_label aria-expanded=false> <label class=md-nav__title for=__nav_4_1> <span class="md-nav__icon md-icon"></span> Setup </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../guides/setup/syntax_highlight/ class=md-nav__link> <span class=md-ellipsis> Syntax highlighting </span> </a> </li> <li class=md-nav__item> <a href=../../../guides/setup/dev_server_setup/ class=md-nav__link> <span class=md-ellipsis> Running with development server </span> </a> </li> <li class=md-nav__item> <a href=../../../guides/setup/logging_and_debugging/ class=md-nav__link> <span class=md-ellipsis> Logging and debugging </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_4_2> <label class=md-nav__link for=__nav_4_2 id=__nav_4_2_label tabindex=0> <span class=md-ellipsis> Dev guides </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_2_label aria-expanded=false> <label class=md-nav__title for=__nav_4_2> <span class="md-nav__icon md-icon"></span> Dev guides </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../guides/devguides/dependency_mgmt/ class=md-nav__link> <span class=md-ellipsis> JS and CSS rendering </span> </a> </li> <li class=md-nav__item> <a href=../../../guides/devguides/slot_rendering/ class=md-nav__link> <span class=md-ellipsis> Slot rendering </span> </a> </li> <li class=md-nav__item> <a href=../../../guides/devguides/slots_and_blocks/ class=md-nav__link> <span class=md-ellipsis> Using slot and block tags </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_5> <label class=md-nav__link for=__nav_5 id=__nav_5_label tabindex=0> <span class=md-ellipsis> API Documentation </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_5_label aria-expanded=false> <label class=md-nav__title for=__nav_5> <span class="md-nav__icon md-icon"></span> API Documentation </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../reference/api/ class=md-nav__link> <span class=md-ellipsis> Api </span> </a> </li> <li class=md-nav__item> <a href=../../../reference/commands/ class=md-nav__link> <span class=md-ellipsis> Commands </span> </a> </li> <li class=md-nav__item> <a href=../../../reference/components/ class=md-nav__link> <span class=md-ellipsis> Components </span> </a> </li> <li class=md-nav__item> <a href=../../../reference/exceptions/ class=md-nav__link> <span class=md-ellipsis> Exceptions </span> </a> </li> <li class=md-nav__item> <a href=../../../reference/middlewares/ class=md-nav__link> <span class=md-ellipsis> Middlewares </span> </a> </li> <li class=md-nav__item> <a href=../../../reference/settings/ class=md-nav__link> <span class=md-ellipsis> Settings </span> </a> </li> <li class=md-nav__item> <a href=../../../reference/tag_formatters/ class=md-nav__link> <span class=md-ellipsis> Tag formatters </span> </a> </li> <li class=md-nav__item> <a href=../../../reference/template_tags/ class=md-nav__link> <span class=md-ellipsis> Template tags </span> </a> </li> <li class=md-nav__item> <a href=../../../reference/template_vars/ class=md-nav__link> <span class=md-ellipsis> Template vars </span> </a> </li> <li class=md-nav__item> <a href=../../../reference/urls/ class=md-nav__link> <span class=md-ellipsis> Urls </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../../release_notes/ class=md-nav__link> <span class=md-ellipsis> Release notes </span> </a> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component=sidebar data-md-type=toc> <div class=md-sidebar__scrollwrap> <div class=md-sidebar__inner> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#removing-atttributes class=md-nav__link> <span class=md-ellipsis> Removing atttributes </span> </a> </li> <li class=md-nav__item> <a href=#boolean-attributes class=md-nav__link> <span class=md-ellipsis> Boolean attributes </span> </a> </li> <li class=md-nav__item> <a href=#default-attributes class=md-nav__link> <span class=md-ellipsis> Default attributes </span> </a> </li> <li class=md-nav__item> <a href=#appending-attributes class=md-nav__link> <span class=md-ellipsis> Appending attributes </span> </a> </li> <li class=md-nav__item> <a href=#rules-for-html_attrs class=md-nav__link> <span class=md-ellipsis> Rules for html_attrs </span> </a> </li> <li class=md-nav__item> <a href=#examples-for-html_attrs class=md-nav__link> <span class=md-ellipsis> Examples for html_attrs </span> </a> </li> <li class=md-nav__item> <a href=#full-example-for-html_attrs class=md-nav__link> <span class=md-ellipsis> Full example for html_attrs </span> </a> </li> <li class=md-nav__item> <a href=#rendering-html-attributes-outside-of-templates class=md-nav__link> <span class=md-ellipsis> Rendering HTML attributes outside of templates </span> </a> </li> </ul> </nav> </div> </div> </div> <div class=md-content data-md-component=content> <article class="md-content__inner md-typeset"> <a href=https://github.com/EmilStenstrom/django-components/edit/master/docs/concepts/fundamentals/html_attributes.md title="Edit this page" class="md-content__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg> </a> <a href=https://github.com/EmilStenstrom/django-components/raw/master/docs/concepts/fundamentals/html_attributes.md title="View source of this page" class="md-content__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M17 18c.56 0 1 .44 1 1s-.44 1-1 1-1-.44-1-1 .44-1 1-1m0-3c-2.73 0-5.06 1.66-6 4 .94 2.34 3.27 4 6 4s5.06-1.66 6-4c-.94-2.34-3.27-4-6-4m0 6.5a2.5 2.5 0 0 1-2.5-2.5 2.5 2.5 0 0 1 2.5-2.5 2.5 2.5 0 0 1 2.5 2.5 2.5 2.5 0 0 1-2.5 2.5M9.27 20H6V4h7v5h5v4.07c.7.08 1.36.25 2 .49V8l-6-6H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h4.5a8.2 8.2 0 0 1-1.23-2"/></svg> </a> <h1>HTML attributes</h1> <p><em>New in version 0.74</em>:</p> <p>You can use the <code>html_attrs</code> tag to render HTML attributes, given a dictionary of values.</p> <p>So if you have a template:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-0-1 name=__codelineno-0-1 href=#__codelineno-0-1></a><span class=x>&lt;div class=&quot;</span><span class=cp>{{</span> <span class=nv>classes</span> <span class=cp>}}</span><span class=x>&quot; data-id=&quot;</span><span class=cp>{{</span> <span class=nv>my_id</span> <span class=cp>}}</span><span class=x>&quot;&gt;</span>
<a id=__codelineno-0-2 name=__codelineno-0-2 href=#__codelineno-0-2></a><span class=x>&lt;/div&gt;</span>
</code></pre></div> <p>You can simplify it with <code>html_attrs</code> tag:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-1-1 name=__codelineno-1-1 href=#__codelineno-1-1></a><span class=x>&lt;div </span><span class=cp>{%</span> <span class=k>html_attrs</span> <span class=nv>attrs</span> <span class=cp>%}</span><span class=x>&gt;</span>
<a id=__codelineno-1-2 name=__codelineno-1-2 href=#__codelineno-1-2></a><span class=x>&lt;/div&gt;</span>
</code></pre></div> <p>where <code>attrs</code> is:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-2-1 name=__codelineno-2-1 href=#__codelineno-2-1></a><span class=n>attrs</span> <span class=o>=</span> <span class=p>{</span>
<a id=__codelineno-2-2 name=__codelineno-2-2 href=#__codelineno-2-2></a> <span class=s2>&quot;class&quot;</span><span class=p>:</span> <span class=n>classes</span><span class=p>,</span>
<a id=__codelineno-2-3 name=__codelineno-2-3 href=#__codelineno-2-3></a> <span class=s2>&quot;data-id&quot;</span><span class=p>:</span> <span class=n>my_id</span><span class=p>,</span>
<a id=__codelineno-2-4 name=__codelineno-2-4 href=#__codelineno-2-4></a><span class=p>}</span>
</code></pre></div> <p>This feature is inspired by <a href="https://github.com/Xzya/django-web-components/tree/master?tab=readme-ov-file#default--merged-attributes"><code>merge_attrs</code> tag of django-web-components</a> and <a href=https://vuejs.org/guide/components/attrs>"fallthrough attributes" feature of Vue</a>.</p> <h2 id=removing-atttributes>Removing atttributes<a class=headerlink href=#removing-atttributes title="Permanent link">¤</a></h2> <p>Attributes that are set to <code>None</code> or <code>False</code> are NOT rendered.</p> <p>So given this input:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-3-1 name=__codelineno-3-1 href=#__codelineno-3-1></a><span class=n>attrs</span> <span class=o>=</span> <span class=p>{</span>
<a id=__codelineno-3-2 name=__codelineno-3-2 href=#__codelineno-3-2></a> <span class=s2>&quot;class&quot;</span><span class=p>:</span> <span class=s2>&quot;text-green&quot;</span><span class=p>,</span>
<a id=__codelineno-3-3 name=__codelineno-3-3 href=#__codelineno-3-3></a> <span class=s2>&quot;required&quot;</span><span class=p>:</span> <span class=kc>False</span><span class=p>,</span>
<a id=__codelineno-3-4 name=__codelineno-3-4 href=#__codelineno-3-4></a> <span class=s2>&quot;data-id&quot;</span><span class=p>:</span> <span class=kc>None</span><span class=p>,</span>
<a id=__codelineno-3-5 name=__codelineno-3-5 href=#__codelineno-3-5></a><span class=p>}</span>
</code></pre></div> <p>And template:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-4-1 name=__codelineno-4-1 href=#__codelineno-4-1></a><span class=x>&lt;div </span><span class=cp>{%</span> <span class=k>html_attrs</span> <span class=nv>attrs</span> <span class=cp>%}</span><span class=x>&gt;</span>
<a id=__codelineno-4-2 name=__codelineno-4-2 href=#__codelineno-4-2></a><span class=x>&lt;/div&gt;</span>
</code></pre></div> <p>Then this renders:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-5-1 name=__codelineno-5-1 href=#__codelineno-5-1></a><span class=p>&lt;</span><span class=nt>div</span> <span class=na>class</span><span class=o>=</span><span class=s>&quot;text-green&quot;</span><span class=p>&gt;&lt;/</span><span class=nt>div</span><span class=p>&gt;</span>
</code></pre></div> <h2 id=boolean-attributes>Boolean attributes<a class=headerlink href=#boolean-attributes title="Permanent link">¤</a></h2> <p>In HTML, boolean attributes are usually rendered with no value. Consider the example below where the first button is disabled and the second is not:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-6-1 name=__codelineno-6-1 href=#__codelineno-6-1></a><span class=p>&lt;</span><span class=nt>button</span> <span class=na>disabled</span><span class=p>&gt;</span>Click me!<span class=p>&lt;/</span><span class=nt>button</span><span class=p>&gt;</span> <span class=p>&lt;</span><span class=nt>button</span><span class=p>&gt;</span>Click me!<span class=p>&lt;/</span><span class=nt>button</span><span class=p>&gt;</span>
</code></pre></div> <p>HTML rendering with <code>html_attrs</code> tag or <code>attributes_to_string</code> works the same way, where <code>key=True</code> is rendered simply as <code>key</code>, and <code>key=False</code> is not render at all.</p> <p>So given this input:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-7-1 name=__codelineno-7-1 href=#__codelineno-7-1></a><span class=n>attrs</span> <span class=o>=</span> <span class=p>{</span>
<a id=__codelineno-7-2 name=__codelineno-7-2 href=#__codelineno-7-2></a> <span class=s2>&quot;disabled&quot;</span><span class=p>:</span> <span class=kc>True</span><span class=p>,</span>
<a id=__codelineno-7-3 name=__codelineno-7-3 href=#__codelineno-7-3></a> <span class=s2>&quot;autofocus&quot;</span><span class=p>:</span> <span class=kc>False</span><span class=p>,</span>
<a id=__codelineno-7-4 name=__codelineno-7-4 href=#__codelineno-7-4></a><span class=p>}</span>
</code></pre></div> <p>And template:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-8-1 name=__codelineno-8-1 href=#__codelineno-8-1></a><span class=x>&lt;div </span><span class=cp>{%</span> <span class=k>html_attrs</span> <span class=nv>attrs</span> <span class=cp>%}</span><span class=x>&gt;</span>
<a id=__codelineno-8-2 name=__codelineno-8-2 href=#__codelineno-8-2></a><span class=x>&lt;/div&gt;</span>
</code></pre></div> <p>Then this renders:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-9-1 name=__codelineno-9-1 href=#__codelineno-9-1></a><span class=p>&lt;</span><span class=nt>div</span> <span class=na>disabled</span><span class=p>&gt;&lt;/</span><span class=nt>div</span><span class=p>&gt;</span>
</code></pre></div> <h2 id=default-attributes>Default attributes<a class=headerlink href=#default-attributes title="Permanent link">¤</a></h2> <p>Sometimes you may want to specify default values for attributes. You can pass a second argument (or kwarg <code>defaults</code>) to set the defaults.</p> <div class=highlight><pre><span></span><code><a id=__codelineno-10-1 name=__codelineno-10-1 href=#__codelineno-10-1></a><span class=x>&lt;div </span><span class=cp>{%</span> <span class=k>html_attrs</span> <span class=nv>attrs</span> <span class=nv>defaults</span> <span class=cp>%}</span><span class=x>&gt;</span>
<a id=__codelineno-10-2 name=__codelineno-10-2 href=#__codelineno-10-2></a><span class=x> ...</span>
<a id=__codelineno-10-3 name=__codelineno-10-3 href=#__codelineno-10-3></a><span class=x>&lt;/div&gt;</span>
</code></pre></div> <p>In the example above, if <code>attrs</code> contains e.g. the <code>class</code> key, <code>html_attrs</code> will render:</p> <p><code>class="{{ attrs.class }}"</code></p> <p>Otherwise, <code>html_attrs</code> will render:</p> <p><code>class="{{ defaults.class }}"</code></p> <h2 id=appending-attributes>Appending attributes<a class=headerlink href=#appending-attributes title="Permanent link">¤</a></h2> <p>For the <code>class</code> HTML attribute, it's common that we want to <em>join</em> multiple values, instead of overriding them. For example, if you're authoring a component, you may want to ensure that the component will ALWAYS have a specific class. Yet, you may want to allow users of your component to supply their own classes.</p> <p>We can achieve this by adding extra kwargs. These values will be appended, instead of overwriting the previous value.</p> <p>So if we have a variable <code>attrs</code>:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-11-1 name=__codelineno-11-1 href=#__codelineno-11-1></a><span class=n>attrs</span> <span class=o>=</span> <span class=p>{</span>
<a id=__codelineno-11-2 name=__codelineno-11-2 href=#__codelineno-11-2></a> <span class=s2>&quot;class&quot;</span><span class=p>:</span> <span class=s2>&quot;my-class pa-4&quot;</span><span class=p>,</span>
<a id=__codelineno-11-3 name=__codelineno-11-3 href=#__codelineno-11-3></a><span class=p>}</span>
</code></pre></div> <p>And on <code>html_attrs</code> tag, we set the key <code>class</code>:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-12-1 name=__codelineno-12-1 href=#__codelineno-12-1></a><span class=x>&lt;div </span><span class=cp>{%</span> <span class=k>html_attrs</span> <span class=nv>attrs</span> <span class=nv>class</span><span class=o>=</span><span class=s2>&quot;some-class&quot;</span> <span class=cp>%}</span><span class=x>&gt;</span>
<a id=__codelineno-12-2 name=__codelineno-12-2 href=#__codelineno-12-2></a><span class=x>&lt;/div&gt;</span>
</code></pre></div> <p>Then these will be merged and rendered as:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-13-1 name=__codelineno-13-1 href=#__codelineno-13-1></a><span class=p>&lt;</span><span class=nt>div</span> <span class=na>data-value</span><span class=o>=</span><span class=s>&quot;my-class pa-4 some-class&quot;</span><span class=p>&gt;&lt;/</span><span class=nt>div</span><span class=p>&gt;</span>
</code></pre></div> <p>To simplify merging of variables, you can supply the same key multiple times, and these will be all joined together:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-14-1 name=__codelineno-14-1 href=#__codelineno-14-1></a><span class=c>{# my_var = &quot;class-from-var text-red&quot; #}</span>
<a id=__codelineno-14-2 name=__codelineno-14-2 href=#__codelineno-14-2></a><span class=x>&lt;div </span><span class=cp>{%</span> <span class=k>html_attrs</span> <span class=nv>attrs</span> <span class=nv>class</span><span class=o>=</span><span class=s2>&quot;some-class another-class&quot;</span> <span class=nv>class</span><span class=o>=</span><span class=nv>my_var</span> <span class=cp>%}</span><span class=x>&gt;</span>
<a id=__codelineno-14-3 name=__codelineno-14-3 href=#__codelineno-14-3></a><span class=x>&lt;/div&gt;</span>
</code></pre></div> <p>Renders:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-15-1 name=__codelineno-15-1 href=#__codelineno-15-1></a><span class=p>&lt;</span><span class=nt>div</span>
<a id=__codelineno-15-2 name=__codelineno-15-2 href=#__codelineno-15-2></a> <span class=na>data-value</span><span class=o>=</span><span class=s>&quot;my-class pa-4 some-class another-class class-from-var text-red&quot;</span>
<a id=__codelineno-15-3 name=__codelineno-15-3 href=#__codelineno-15-3></a><span class=p>&gt;&lt;/</span><span class=nt>div</span><span class=p>&gt;</span>
</code></pre></div> <h2 id=rules-for-html_attrs>Rules for <code>html_attrs</code><a class=headerlink href=#rules-for-html_attrs title="Permanent link">¤</a></h2> <ol> <li>Both <code>attrs</code> and <code>defaults</code> can be passed as positional args</li> </ol> <p><code>{% html_attrs attrs defaults key=val %}</code></p> <p>or as kwargs</p> <p><code>{% html_attrs key=val defaults=defaults attrs=attrs %}</code></p> <ol> <li> <p>Both <code>attrs</code> and <code>defaults</code> are optional (can be omitted)</p> </li> <li> <p>Both <code>attrs</code> and <code>defaults</code> are dictionaries, and we can define them the same way <a href=#pass-dictonary-by-its-key-value-pairs>we define dictionaries for the <code>component</code> tag</a>. So either as <code>attrs=attrs</code> or <code>attrs:key=value</code>.</p> </li> <li> <p>All other kwargs are appended and can be repeated.</p> </li> </ol> <h2 id=examples-for-html_attrs>Examples for <code>html_attrs</code><a class=headerlink href=#examples-for-html_attrs title="Permanent link">¤</a></h2> <p>Assuming that:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-16-1 name=__codelineno-16-1 href=#__codelineno-16-1></a><span class=n>class_from_var</span> <span class=o>=</span> <span class=s2>&quot;from-var&quot;</span>
<a id=__codelineno-16-2 name=__codelineno-16-2 href=#__codelineno-16-2></a>
<a id=__codelineno-16-3 name=__codelineno-16-3 href=#__codelineno-16-3></a><span class=n>attrs</span> <span class=o>=</span> <span class=p>{</span>
<a id=__codelineno-16-4 name=__codelineno-16-4 href=#__codelineno-16-4></a> <span class=s2>&quot;class&quot;</span><span class=p>:</span> <span class=s2>&quot;from-attrs&quot;</span><span class=p>,</span>
<a id=__codelineno-16-5 name=__codelineno-16-5 href=#__codelineno-16-5></a> <span class=s2>&quot;type&quot;</span><span class=p>:</span> <span class=s2>&quot;submit&quot;</span><span class=p>,</span>
<a id=__codelineno-16-6 name=__codelineno-16-6 href=#__codelineno-16-6></a><span class=p>}</span>
<a id=__codelineno-16-7 name=__codelineno-16-7 href=#__codelineno-16-7></a>
<a id=__codelineno-16-8 name=__codelineno-16-8 href=#__codelineno-16-8></a><span class=n>defaults</span> <span class=o>=</span> <span class=p>{</span>
<a id=__codelineno-16-9 name=__codelineno-16-9 href=#__codelineno-16-9></a> <span class=s2>&quot;class&quot;</span><span class=p>:</span> <span class=s2>&quot;from-defaults&quot;</span><span class=p>,</span>
<a id=__codelineno-16-10 name=__codelineno-16-10 href=#__codelineno-16-10></a> <span class=s2>&quot;role&quot;</span><span class=p>:</span> <span class=s2>&quot;button&quot;</span><span class=p>,</span>
<a id=__codelineno-16-11 name=__codelineno-16-11 href=#__codelineno-16-11></a><span class=p>}</span>
</code></pre></div> <p>Then:</p> <ul> <li>Empty tag <br> <code>{% html_attr %}</code></li> </ul> <p>renders (empty string): <br> <code></code></p> <ul> <li>Only kwargs <br> <code>{% html_attr class="some-class" class=class_from_var data-id="123" %}</code></li> </ul> <p>renders: <br> <code>class="some-class from-var" data-id="123"</code></p> <ul> <li>Only attrs <br> <code>{% html_attr attrs %}</code></li> </ul> <p>renders: <br> <code>class="from-attrs" type="submit"</code></p> <ul> <li>Attrs as kwarg <br> <code>{% html_attr attrs=attrs %}</code></li> </ul> <p>renders: <br> <code>class="from-attrs" type="submit"</code></p> <ul> <li>Only defaults (as kwarg) <br> <code>{% html_attr defaults=defaults %}</code></li> </ul> <p>renders: <br> <code>class="from-defaults" role="button"</code></p> <ul> <li>Attrs using the <code>prefix:key=value</code> construct <br> <code>{% html_attr attrs:class="from-attrs" attrs:type="submit" %}</code></li> </ul> <p>renders: <br> <code>class="from-attrs" type="submit"</code></p> <ul> <li>Defaults using the <code>prefix:key=value</code> construct <br> <code>{% html_attr defaults:class="from-defaults" %}</code></li> </ul> <p>renders: <br> <code>class="from-defaults" role="button"</code></p> <ul> <li>All together (1) - attrs and defaults as positional args: <br> <code>{% html_attrs attrs defaults class="added_class" class=class_from_var data-id=123 %}</code></li> </ul> <p>renders: <br> <code>class="from-attrs added_class from-var" type="submit" role="button" data-id=123</code></p> <ul> <li>All together (2) - attrs and defaults as kwargs args: <br> <code>{% html_attrs class="added_class" class=class_from_var data-id=123 attrs=attrs defaults=defaults %}</code></li> </ul> <p>renders: <br> <code>class="from-attrs added_class from-var" type="submit" role="button" data-id=123</code></p> <ul> <li>All together (3) - mixed: <br> <code>{% html_attrs attrs defaults:class="default-class" class="added_class" class=class_from_var data-id=123 %}</code></li> </ul> <p>renders: <br> <code>class="from-attrs added_class from-var" type="submit" data-id=123</code></p> <h2 id=full-example-for-html_attrs>Full example for <code>html_attrs</code><a class=headerlink href=#full-example-for-html_attrs title="Permanent link">¤</a></h2> <div class=highlight><pre><span></span><code><a id=__codelineno-17-1 name=__codelineno-17-1 href=#__codelineno-17-1></a><span class=nd>@register</span><span class=p>(</span><span class=s2>&quot;my_comp&quot;</span><span class=p>)</span>
<a id=__codelineno-17-2 name=__codelineno-17-2 href=#__codelineno-17-2></a><span class=k>class</span><span class=w> </span><span class=nc>MyComp</span><span class=p>(</span><span class=n>Component</span><span class=p>):</span>
<a id=__codelineno-17-3 name=__codelineno-17-3 href=#__codelineno-17-3></a> <span class=n>template</span><span class=p>:</span> <span class=n>t</span><span class=o>.</span><span class=n>django_html</span> <span class=o>=</span> <span class=s2>&quot;&quot;&quot;</span>
<a id=__codelineno-17-4 name=__codelineno-17-4 href=#__codelineno-17-4></a><span class=s2> &lt;div</span>
<a id=__codelineno-17-5 name=__codelineno-17-5 href=#__codelineno-17-5></a><span class=s2> {% html_attrs attrs</span>
<a id=__codelineno-17-6 name=__codelineno-17-6 href=#__codelineno-17-6></a><span class=s2> defaults:class=&quot;pa-4 text-red&quot;</span>
<a id=__codelineno-17-7 name=__codelineno-17-7 href=#__codelineno-17-7></a><span class=s2> class=&quot;my-comp-date&quot;</span>
<a id=__codelineno-17-8 name=__codelineno-17-8 href=#__codelineno-17-8></a><span class=s2> class=class_from_var</span>
<a id=__codelineno-17-9 name=__codelineno-17-9 href=#__codelineno-17-9></a><span class=s2> data-id=&quot;123&quot;</span>
<a id=__codelineno-17-10 name=__codelineno-17-10 href=#__codelineno-17-10></a><span class=s2> %}</span>
<a id=__codelineno-17-11 name=__codelineno-17-11 href=#__codelineno-17-11></a><span class=s2> &gt;</span>
<a id=__codelineno-17-12 name=__codelineno-17-12 href=#__codelineno-17-12></a><span class=s2> Today&#39;s date is &lt;span&gt;{{ date }}&lt;/span&gt;</span>
<a id=__codelineno-17-13 name=__codelineno-17-13 href=#__codelineno-17-13></a><span class=s2> &lt;/div&gt;</span>
<a id=__codelineno-17-14 name=__codelineno-17-14 href=#__codelineno-17-14></a><span class=s2> &quot;&quot;&quot;</span>
<a id=__codelineno-17-15 name=__codelineno-17-15 href=#__codelineno-17-15></a>
<a id=__codelineno-17-16 name=__codelineno-17-16 href=#__codelineno-17-16></a> <span class=k>def</span><span class=w> </span><span class=nf>get_context_data</span><span class=p>(</span><span class=bp>self</span><span class=p>,</span> <span class=n>date</span><span class=p>:</span> <span class=n>Date</span><span class=p>,</span> <span class=n>attrs</span><span class=p>:</span> <span class=nb>dict</span><span class=p>):</span>
<a id=__codelineno-17-17 name=__codelineno-17-17 href=#__codelineno-17-17></a> <span class=k>return</span> <span class=p>{</span>
<a id=__codelineno-17-18 name=__codelineno-17-18 href=#__codelineno-17-18></a> <span class=s2>&quot;date&quot;</span><span class=p>:</span> <span class=n>date</span><span class=p>,</span>
<a id=__codelineno-17-19 name=__codelineno-17-19 href=#__codelineno-17-19></a> <span class=s2>&quot;attrs&quot;</span><span class=p>:</span> <span class=n>attrs</span><span class=p>,</span>
<a id=__codelineno-17-20 name=__codelineno-17-20 href=#__codelineno-17-20></a> <span class=s2>&quot;class_from_var&quot;</span><span class=p>:</span> <span class=s2>&quot;extra-class&quot;</span>
<a id=__codelineno-17-21 name=__codelineno-17-21 href=#__codelineno-17-21></a> <span class=p>}</span>
<a id=__codelineno-17-22 name=__codelineno-17-22 href=#__codelineno-17-22></a>
<a id=__codelineno-17-23 name=__codelineno-17-23 href=#__codelineno-17-23></a><span class=nd>@register</span><span class=p>(</span><span class=s2>&quot;parent&quot;</span><span class=p>)</span>
<a id=__codelineno-17-24 name=__codelineno-17-24 href=#__codelineno-17-24></a><span class=k>class</span><span class=w> </span><span class=nc>Parent</span><span class=p>(</span><span class=n>Component</span><span class=p>):</span>
<a id=__codelineno-17-25 name=__codelineno-17-25 href=#__codelineno-17-25></a> <span class=n>template</span><span class=p>:</span> <span class=n>t</span><span class=o>.</span><span class=n>django_html</span> <span class=o>=</span> <span class=s2>&quot;&quot;&quot;</span>
<a id=__codelineno-17-26 name=__codelineno-17-26 href=#__codelineno-17-26></a><span class=s2> {</span><span class=si>% c</span><span class=s2>omponent &quot;my_comp&quot;</span>
<a id=__codelineno-17-27 name=__codelineno-17-27 href=#__codelineno-17-27></a><span class=s2> date=date</span>
<a id=__codelineno-17-28 name=__codelineno-17-28 href=#__codelineno-17-28></a><span class=s2> attrs:class=&quot;pa-0 border-solid border-red&quot;</span>
<a id=__codelineno-17-29 name=__codelineno-17-29 href=#__codelineno-17-29></a><span class=s2> attrs:data-json=json_data</span>
<a id=__codelineno-17-30 name=__codelineno-17-30 href=#__codelineno-17-30></a><span class=s2> attrs:@click=&quot;(e) =&gt; onClick(e, &#39;from_parent&#39;)&quot;</span>
<a id=__codelineno-17-31 name=__codelineno-17-31 href=#__codelineno-17-31></a><span class=s2> / %}</span>
<a id=__codelineno-17-32 name=__codelineno-17-32 href=#__codelineno-17-32></a><span class=s2> &quot;&quot;&quot;</span>
<a id=__codelineno-17-33 name=__codelineno-17-33 href=#__codelineno-17-33></a>
<a id=__codelineno-17-34 name=__codelineno-17-34 href=#__codelineno-17-34></a> <span class=k>def</span><span class=w> </span><span class=nf>get_context_data</span><span class=p>(</span><span class=bp>self</span><span class=p>,</span> <span class=n>date</span><span class=p>:</span> <span class=n>Date</span><span class=p>):</span>
<a id=__codelineno-17-35 name=__codelineno-17-35 href=#__codelineno-17-35></a> <span class=k>return</span> <span class=p>{</span>
<a id=__codelineno-17-36 name=__codelineno-17-36 href=#__codelineno-17-36></a> <span class=s2>&quot;date&quot;</span><span class=p>:</span> <span class=n>datetime</span><span class=o>.</span><span class=n>now</span><span class=p>(),</span>
<a id=__codelineno-17-37 name=__codelineno-17-37 href=#__codelineno-17-37></a> <span class=s2>&quot;json_data&quot;</span><span class=p>:</span> <span class=n>json</span><span class=o>.</span><span class=n>dumps</span><span class=p>({</span><span class=s2>&quot;value&quot;</span><span class=p>:</span> <span class=mi>456</span><span class=p>})</span>
<a id=__codelineno-17-38 name=__codelineno-17-38 href=#__codelineno-17-38></a> <span class=p>}</span>
</code></pre></div> <p>Note: For readability, we've split the tags across multiple lines.</p> <p>Inside <code>MyComp</code>, we defined a default attribute</p> <p><code>defaults:class="pa-4 text-red"</code></p> <p>So if <code>attrs</code> includes key <code>class</code>, the default above will be ignored.</p> <p><code>MyComp</code> also defines <code>class</code> key twice. It means that whether the <code>class</code> attribute is taken from <code>attrs</code> or <code>defaults</code>, the two <code>class</code> values will be appended to it.</p> <p>So by default, <code>MyComp</code> renders:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-18-1 name=__codelineno-18-1 href=#__codelineno-18-1></a><span class=p>&lt;</span><span class=nt>div</span> <span class=na>class</span><span class=o>=</span><span class=s>&quot;pa-4 text-red my-comp-date extra-class&quot;</span> <span class=na>data-id</span><span class=o>=</span><span class=s>&quot;123&quot;</span><span class=p>&gt;</span>...<span class=p>&lt;/</span><span class=nt>div</span><span class=p>&gt;</span>
</code></pre></div> <p>Next, let's consider what will be rendered when we call <code>MyComp</code> from <code>Parent</code> component.</p> <p><code>MyComp</code> accepts a <code>attrs</code> dictionary, that is passed to <code>html_attrs</code>, so the contents of that dictionary are rendered as the HTML attributes.</p> <p>In <code>Parent</code>, we make use of passing dictionary key-value pairs as kwargs to define individual attributes as if they were regular kwargs.</p> <p>So all kwargs that start with <code>attrs:</code> will be collected into an <code>attrs</code> dict.</p> <div class=highlight><pre><span></span><code><a id=__codelineno-19-1 name=__codelineno-19-1 href=#__codelineno-19-1></a><span class=x> attrs:class=&quot;pa-0 border-solid border-red&quot;</span>
<a id=__codelineno-19-2 name=__codelineno-19-2 href=#__codelineno-19-2></a><span class=x> attrs:data-json=json_data</span>
<a id=__codelineno-19-3 name=__codelineno-19-3 href=#__codelineno-19-3></a><span class=x> attrs:@click=&quot;(e) =&gt; onClick(e, &#39;from_parent&#39;)&quot;</span>
</code></pre></div> <p>And <code>get_context_data</code> of <code>MyComp</code> will receive <code>attrs</code> input with following keys:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-20-1 name=__codelineno-20-1 href=#__codelineno-20-1></a><span class=n>attrs</span> <span class=o>=</span> <span class=p>{</span>
<a id=__codelineno-20-2 name=__codelineno-20-2 href=#__codelineno-20-2></a> <span class=s2>&quot;class&quot;</span><span class=p>:</span> <span class=s2>&quot;pa-0 border-solid&quot;</span><span class=p>,</span>
<a id=__codelineno-20-3 name=__codelineno-20-3 href=#__codelineno-20-3></a> <span class=s2>&quot;data-json&quot;</span><span class=p>:</span> <span class=s1>&#39;{&quot;value&quot;: 456}&#39;</span><span class=p>,</span>
<a id=__codelineno-20-4 name=__codelineno-20-4 href=#__codelineno-20-4></a> <span class=s2>&quot;@click&quot;</span><span class=p>:</span> <span class=s2>&quot;(e) =&gt; onClick(e, &#39;from_parent&#39;)&quot;</span><span class=p>,</span>
<a id=__codelineno-20-5 name=__codelineno-20-5 href=#__codelineno-20-5></a><span class=p>}</span>
</code></pre></div> <p><code>attrs["class"]</code> overrides the default value for <code>class</code>, whereas other keys will be merged.</p> <p>So in the end <code>MyComp</code> will render:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-21-1 name=__codelineno-21-1 href=#__codelineno-21-1></a><span class=p>&lt;</span><span class=nt>div</span>
<a id=__codelineno-21-2 name=__codelineno-21-2 href=#__codelineno-21-2></a> <span class=na>class</span><span class=o>=</span><span class=s>&quot;pa-0 border-solid my-comp-date extra-class&quot;</span>
<a id=__codelineno-21-3 name=__codelineno-21-3 href=#__codelineno-21-3></a> <span class=na>data-id</span><span class=o>=</span><span class=s>&quot;123&quot;</span>
<a id=__codelineno-21-4 name=__codelineno-21-4 href=#__codelineno-21-4></a> <span class=na>data-json</span><span class=o>=</span><span class=s>&#39;{&quot;value&quot;: 456}&#39;</span>
<a id=__codelineno-21-5 name=__codelineno-21-5 href=#__codelineno-21-5></a> <span class=err>@</span><span class=na>click</span><span class=o>=</span><span class=s>&quot;(e) =&gt; onClick(e, &#39;from_parent&#39;)&quot;</span>
<a id=__codelineno-21-6 name=__codelineno-21-6 href=#__codelineno-21-6></a><span class=p>&gt;</span>
<a id=__codelineno-21-7 name=__codelineno-21-7 href=#__codelineno-21-7></a> ...
<a id=__codelineno-21-8 name=__codelineno-21-8 href=#__codelineno-21-8></a><span class=p>&lt;/</span><span class=nt>div</span><span class=p>&gt;</span>
</code></pre></div> <h2 id=rendering-html-attributes-outside-of-templates>Rendering HTML attributes outside of templates<a class=headerlink href=#rendering-html-attributes-outside-of-templates title="Permanent link">¤</a></h2> <p>If you need to use serialize HTML attributes outside of Django template and the <code>html_attrs</code> tag, you can use <code>attributes_to_string</code>:</p> <div class=highlight><pre><span></span><code><a id=__codelineno-22-1 name=__codelineno-22-1 href=#__codelineno-22-1></a><span class=kn>from</span><span class=w> </span><span class=nn>django_components.attributes</span><span class=w> </span><span class=kn>import</span> <span class=n>attributes_to_string</span>
<a id=__codelineno-22-2 name=__codelineno-22-2 href=#__codelineno-22-2></a>
<a id=__codelineno-22-3 name=__codelineno-22-3 href=#__codelineno-22-3></a><span class=n>attrs</span> <span class=o>=</span> <span class=p>{</span>
<a id=__codelineno-22-4 name=__codelineno-22-4 href=#__codelineno-22-4></a> <span class=s2>&quot;class&quot;</span><span class=p>:</span> <span class=s2>&quot;my-class text-red pa-4&quot;</span><span class=p>,</span>
<a id=__codelineno-22-5 name=__codelineno-22-5 href=#__codelineno-22-5></a> <span class=s2>&quot;data-id&quot;</span><span class=p>:</span> <span class=mi>123</span><span class=p>,</span>
<a id=__codelineno-22-6 name=__codelineno-22-6 href=#__codelineno-22-6></a> <span class=s2>&quot;required&quot;</span><span class=p>:</span> <span class=kc>True</span><span class=p>,</span>
<a id=__codelineno-22-7 name=__codelineno-22-7 href=#__codelineno-22-7></a> <span class=s2>&quot;disabled&quot;</span><span class=p>:</span> <span class=kc>False</span><span class=p>,</span>
<a id=__codelineno-22-8 name=__codelineno-22-8 href=#__codelineno-22-8></a> <span class=s2>&quot;ignored-attr&quot;</span><span class=p>:</span> <span class=kc>None</span><span class=p>,</span>
<a id=__codelineno-22-9 name=__codelineno-22-9 href=#__codelineno-22-9></a><span class=p>}</span>
<a id=__codelineno-22-10 name=__codelineno-22-10 href=#__codelineno-22-10></a>
<a id=__codelineno-22-11 name=__codelineno-22-11 href=#__codelineno-22-11></a><span class=n>attributes_to_string</span><span class=p>(</span><span class=n>attrs</span><span class=p>)</span>
<a id=__codelineno-22-12 name=__codelineno-22-12 href=#__codelineno-22-12></a><span class=c1># &#39;class=&quot;my-class text-red pa-4&quot; data-id=&quot;123&quot; required&#39;</span>
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