302 lines
17 KiB
HTML
302 lines
17 KiB
HTML
<!doctype html>
|
||
<!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
|
||
<!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8"> <![endif]-->
|
||
<!--[if IE 8]> <html class="no-js lt-ie9"> <![endif]-->
|
||
<!--[if gt IE 8]><!--> <html> <!--<![endif]-->
|
||
<head>
|
||
<meta charset="utf-8">
|
||
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
|
||
<title>Using Events - Home Assistant</title>
|
||
<meta name="author" content="Home Assistant">
|
||
<meta name="description" content="Introduction to using events in Home Assistant.">
|
||
<meta name="viewport" content="width=device-width">
|
||
<link rel="canonical" href="https://home-assistant.io/developers/development_events/">
|
||
<meta property="fb:app_id" content="338291289691179">
|
||
<meta property="og:title" content="Using Events">
|
||
<meta property="og:site_name" content="Home Assistant">
|
||
<meta property="og:url" content="https://home-assistant.io/developers/development_events/">
|
||
<meta property="og:type" content="website">
|
||
<meta property="og:description" content="Introduction to using events in Home Assistant.">
|
||
<meta property="og:image" content="https://home-assistant.io/images/default-social.png">
|
||
<meta name="twitter:card" content="summary_large_image">
|
||
<meta name="twitter:site" content="@home_assistant">
|
||
<meta name="twitter:title" content="Using Events">
|
||
<meta name="twitter:description" content="Introduction to using events in Home Assistant.">
|
||
<meta name="twitter:image" content="https://home-assistant.io/images/default-social.png">
|
||
<link href="/stylesheets/screen.css" media="screen, projection, print" rel="stylesheet">
|
||
<link href="/atom.xml" rel="alternate" title="Home Assistant" type="application/atom+xml">
|
||
<link rel='shortcut icon' href='/images/favicon.ico' />
|
||
<link rel='icon' type='image/png' href='/images/favicon-192x192.png' sizes='192x192' />
|
||
</head>
|
||
<body >
|
||
<header class='site-header'>
|
||
<div class="grid-wrapper">
|
||
<div class="grid">
|
||
<div class="grid__item three-tenths lap-two-sixths palm-one-whole ha-title">
|
||
<a href="/" class="site-title">
|
||
<img width='40' src='/demo/favicon-192x192.png'>
|
||
<span>Home Assistant</span>
|
||
</a>
|
||
</div>
|
||
<div class="grid__item seven-tenths lap-four-sixths palm-one-whole">
|
||
<nav>
|
||
<input type="checkbox" id="toggle">
|
||
<label for="toggle" class="toggle" data-open="Main Menu" data-close="Close Menu"></label>
|
||
<ul class="menu pull-right">
|
||
<li><a href="/getting-started/">Getting started</a></li>
|
||
<li><a href="/components/">Components</a></li>
|
||
<li><a href="/docs/">Docs</a></li>
|
||
<li><a href="/cookbook/">Examples</a></li>
|
||
<li><a href="/developers/">Developers</a></li>
|
||
<li><a href="/blog/">Blog</a></li>
|
||
<li><a href="/help/">Need help?</a></li>
|
||
<li><a href='#' class='show-search'><i class="icon-search"></i></a></li>
|
||
</ul>
|
||
</nav>
|
||
<div class='search-container' style='display: none'>
|
||
<div class='search'>
|
||
<i class="icon-search"></i>
|
||
<input id='search' placeholder='Search the docs…'>
|
||
<a href='#' class='close'><i class="icon-remove-sign"></i></a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</header>
|
||
<div class="grid-wrapper">
|
||
<div class="grid grid-center">
|
||
<div class="grid__item two-thirds lap-one-whole palm-one-whole">
|
||
<article class="page">
|
||
<header>
|
||
<h1 class="title indent">
|
||
Using Events
|
||
</h1>
|
||
</header>
|
||
<hr class="divider">
|
||
<p>The core of Home Assistant is driven by events. That means that if you want to respond to something happening, you’ll have to respond to events. Most of the times you won’t interact directly with the event system but use one of the <a href="https://dev-docs.home-assistant.io/en/master/api/helpers.html#module-homeassistant.helpers.event">event listener helpers</a>.</p>
|
||
<p>The event system is very flexible. There are no limitations on the event type, as long as it’s a string. Each event can contain data. The data is a dictionary that can contain any data as long as it’s JSON serializable. This means that you can use number, string, dictionary and list.</p>
|
||
<p><a href="/docs/configuration/events/">List of events that Home Assistant fires.</a></p>
|
||
<h3><a class="title-link" name="firing-events" href="#firing-events"></a> Firing events</h3>
|
||
<p>To fire an event, you have to interact with the event bus. The event bus is available on the Home Assistant instance as <code class="highlighter-rouge">hass.bus</code>.</p>
|
||
<p>Example component that will fire an event when loaded.</p>
|
||
<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="n">DOMAIN</span> <span class="o">=</span> <span class="s">'hello_event'</span>
|
||
|
||
<span class="k">def</span> <span class="nf">setup</span><span class="p">(</span><span class="n">hass</span><span class="p">,</span> <span class="n">config</span><span class="p">):</span>
|
||
<span class="s">"""Set up is called when Home Assistant is loading our component."""</span>
|
||
|
||
<span class="c"># Fire event my_cool_event with event data answer=42</span>
|
||
<span class="n">hass</span><span class="o">.</span><span class="n">bus</span><span class="o">.</span><span class="n">fire</span><span class="p">(</span><span class="s">'my_cool_event'</span><span class="p">,</span> <span class="p">{</span>
|
||
<span class="s">'answer'</span><span class="p">:</span> <span class="mi">42</span>
|
||
<span class="p">})</span>
|
||
</code></pre>
|
||
</div>
|
||
<h3><a class="title-link" name="listening-to-events" href="#listening-to-events"></a> Listening to events</h3>
|
||
<p>Most of the times you’ll not be firing events but instead listen to events. For example, the state change of an entity is broadcasted as an event.</p>
|
||
<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="n">DOMAIN</span> <span class="o">=</span> <span class="s">'hello_event'</span>
|
||
|
||
<span class="k">def</span> <span class="nf">setup</span><span class="p">(</span><span class="n">hass</span><span class="p">,</span> <span class="n">config</span><span class="p">):</span>
|
||
<span class="s">"""Set up is called when Home Assistant is loading our component."""</span>
|
||
<span class="n">count</span> <span class="o">=</span> <span class="mi">0</span>
|
||
|
||
<span class="c"># Listener to handle fired events</span>
|
||
<span class="k">def</span> <span class="nf">handle_event</span><span class="p">(</span><span class="n">event</span><span class="p">):</span>
|
||
<span class="n">nonlocal</span> <span class="n">count</span>
|
||
<span class="n">count</span> <span class="o">+=</span> <span class="mi">1</span>
|
||
<span class="k">print</span><span class="p">(</span><span class="s">'Total events received:'</span><span class="p">,</span> <span class="n">count</span><span class="p">)</span>
|
||
|
||
<span class="c"># Listen for when my_cool_event is fired</span>
|
||
<span class="n">hass</span><span class="o">.</span><span class="n">bus</span><span class="o">.</span><span class="n">listen</span><span class="p">(</span><span class="s">'my_cool_event'</span><span class="p">,</span> <span class="n">handle_event</span><span class="p">)</span>
|
||
</code></pre>
|
||
</div>
|
||
<h4><a class="title-link" name="helpers" href="#helpers"></a> Helpers</h4>
|
||
<p>Home Assistant comes with a lot of bundled helpers to listen to specific types of event. There are helpers to track a point in time, to track a time interval, a state change or the sun set. <a href="https://dev-docs.home-assistant.io/en/master/api/helpers.html#module-homeassistant.helpers.event">See available methods.</a></p>
|
||
</article>
|
||
</div>
|
||
<aside id="sidebar" class="grid__item one-third lap-one-whole palm-one-whole">
|
||
<div class="grid">
|
||
<section class="aside-module grid__item one-whole lap-one-half">
|
||
<div class='edit-github'><a href='https://github.com/home-assistant/home-assistant.github.io/tree/current/source/developers/development_events.markdown'>Edit this page on GitHub</a></div>
|
||
<div class='section'>
|
||
<h1 class="title delta">Development Guide</h1>
|
||
<ul class='divided sidebar-menu'>
|
||
<li>
|
||
<a href='/developers/'>Introduction </a>
|
||
<ul>
|
||
<li><a href='/developers/architecture/'>Architecture </a></li>
|
||
<li><a href='/developers/architecture_components/'>Components </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/development/'>Starting with Development </a>
|
||
<ul>
|
||
<li><a href='/developers/development_environment/'>Setting up Environment </a></li>
|
||
<li><a href='/developers/development_submitting/'>Submit your Work </a></li>
|
||
<li><a href='/developers/development_checklist/'>Checklist </a></li>
|
||
<li><a href='/developers/development_guidelines/'>Style guidelines </a></li>
|
||
<li><a href='/developers/development_testing/'>Testing </a></li>
|
||
<li><a href='/developers/development_catching_up/'>Catching up with Reality </a></li>
|
||
<li><a href='/developers/development_validation/'>Validation </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/development_101/'>Development 101 </a>
|
||
<ul>
|
||
<li><a href='/developers/development_hass_object/'>Hass object </a></li>
|
||
<li><a class='active' href='/developers/development_events/'>Events </a></li>
|
||
<li><a href='/developers/development_states/'>States </a></li>
|
||
<li><a href='/developers/development_services/'>Services </a></li>
|
||
<li><a href='/developers/development_config/'>Config </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/add_new_platform/'>Creating a new platform (to support a new device) </a>
|
||
<ul>
|
||
<li><a href='/developers/code_review_platform/'>Checklist creating a platform </a></li>
|
||
<li><a href='/developers/platform_example_sensor/'>Example sensor platform </a></li>
|
||
<li><a href='/developers/platform_example_light/'>Example light platform </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/creating_components/'>Adding a new component </a>
|
||
<ul>
|
||
<li><a href='/developers/code_review_component/'>Checklist creating a component </a></li>
|
||
<li><a href='/developers/component_loading/'>Loading components </a></li>
|
||
<li><a href='/developers/component_deps_and_reqs/'>Requirements & Dependencies </a></li>
|
||
<li><a href='/developers/component_events/'>Handling events </a></li>
|
||
<li><a href='/developers/component_states/'>States </a></li>
|
||
<li><a href='/developers/component_visibility/'>Visibility </a></li>
|
||
<li><a href='/developers/component_generic_discovery/'>Loading Platforms </a></li>
|
||
<li><a href='/developers/component_discovery/'>Component Discovery </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/intent/'>Intents (handling voice responses) </a>
|
||
<ul>
|
||
<li><a href='/developers/intent/firing/'>Firing intents </a></li>
|
||
<li><a href='/developers/intent/handling/'>Handling intents </a></li>
|
||
<li><a href='/developers/intent/conversation/'>Registering sentences </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/asyncio/'>Asynchronous Programming </a>
|
||
<ul>
|
||
<li><a href='/developers/asyncio_101/'>Introduction to asyncio </a></li>
|
||
<li><a href='/developers/asyncio_categorizing_functions/'>Categorizing Functions </a></li>
|
||
<li><a href='/developers/asyncio_working_with_async/'>Working with Async </a></li>
|
||
<li><a href='/developers/asyncio_misc/'>Miscellaneous </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/frontend/'>Frontend Development </a>
|
||
<ul>
|
||
<li><a href='/developers/frontend_add_card/'>Add State Card </a></li>
|
||
<li><a href='/developers/frontend_add_more_info/'>Add More Info Dialog </a></li>
|
||
<li><a href='/developers/frontend_creating_custom_panels/'>Add Custom Panels </a></li>
|
||
<li><a href='/developers/frontend_creating_custom_ui/'>Add Custom UI </a></li>
|
||
<li><a href='/developers/frontend_translation/'>Translation </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/hassio/architecture/'>Hass.io architecture </a>
|
||
<ul>
|
||
<li><a href='/developers/hassio/debugging/'>Debugging Hass.io </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/hassio/addon_development/'>Hass.io Add-on Development </a>
|
||
<ul>
|
||
<li><a href='/developers/hassio/addon_tutorial/'>Tutorial: Making your first add-on </a></li>
|
||
<li><a href='/developers/hassio/addon_config/'>Configuration </a></li>
|
||
<li><a href='/developers/hassio/addon_communication/'>Communication </a></li>
|
||
<li><a href='/developers/hassio/addon_testing/'>Local Testing </a></li>
|
||
<li><a href='/developers/hassio/addon_publishing/'>Publishing </a></li>
|
||
<li><a href='/developers/hassio/addon_repository/'>Repositories </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/api/'>API </a>
|
||
<ul>
|
||
<li><a href='https://dev-docs.home-assistant.io/en/dev/'>Python API </a></li>
|
||
<li><a href='/developers/websocket_api/'>Websocket API </a></li>
|
||
<li><a href='/developers/rest_api/'>REST API </a></li>
|
||
<li><a href='/developers/python_api/'>Python REST API </a></li>
|
||
<li><a href='/developers/server_sent_events/'>Server-sent events </a></li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<a href='/developers/documentation/'>Website/Documentation </a>
|
||
<ul>
|
||
<li><a href='/developers/documentation/standards/'>Standards </a></li>
|
||
<li><a href='/developers/documentation/create_page/'>Create a new page </a></li>
|
||
</ul>
|
||
</li>
|
||
<li><a href='/developers/helpers/'>Online helpers </a></li>
|
||
<li><a href='/developers/releasing/'>Releasing </a></li>
|
||
<li><a href='/developers/maintenance/'>Maintenance </a></li>
|
||
<li>
|
||
Governance
|
||
<ul>
|
||
<li><a href='/developers/cla/'>Contributor License Agreement </a></li>
|
||
<li><a href='/privacy/'>Privacy Policy </a></li>
|
||
<li><a href='/tos/'>Terms of Service </a></li>
|
||
<li><a href='/code_of_conduct/'>Code of Conduct </a></li>
|
||
<li><a href='/developers/credits/'>Credits </a></li>
|
||
<li><a href='/developers/license/'>License </a></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</section>
|
||
</div>
|
||
</aside>
|
||
</div>
|
||
</div>
|
||
<footer>
|
||
<div class="grid-wrapper">
|
||
<div class="grid">
|
||
<div class="grid__item">
|
||
<div class="copyright">
|
||
<a rel="me" href='https://twitter.com/home_assistant'><i class="icon-twitter"></i></a>
|
||
<a rel="me" href='https://facebook.com/homeassistantio'><i class="icon-facebook"></i></a>
|
||
<a rel="me" href='https://plus.google.com/110560654828510104551'><i class="icon-google-plus"></i></a>
|
||
<a rel="me" href='https://github.com/home-assistant/home-assistant'><i class="icon-github"></i></a>
|
||
<div class="credit">
|
||
Contact us at <a href='mailto:hello@home-assistant.io'>hello@home-assistant.io</a> (no support!).<br>
|
||
Website powered by <a href='http://jekyllrb.com/'>Jekyll</a> and the <a href='https://github.com/coogie/oscailte'>Oscalite theme</a>.<br />
|
||
Hosted by <a href='https://pages.github.com/'>GitHub</a> and served by <a href='https://cloudflare.com'>CloudFlare</a>.
|
||
</div>
|
||
<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" property="dct:title">home-assistant.io</span> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</footer>
|
||
<script>
|
||
var _gaq=[['_setAccount','UA-57927901-1'],['_trackPageview']];
|
||
(function(d,t){var g=d.createElement(t),s=d.getElementsByTagName(t)[0];
|
||
g.src=('https:'==location.protocol?'//ssl':'//www')+'.google-analytics.com/ga.js';
|
||
s.parentNode.insertBefore(g,s)}(document,'script'));
|
||
</script>
|
||
<link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/2/docsearch.min.css" />
|
||
<script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/2/docsearch.min.js"></script>
|
||
<script type="text/javascript">
|
||
docsearch({
|
||
apiKey: 'ae96d94b201c5444c8a443093edf3efb',
|
||
indexName: 'home-assistant',
|
||
inputSelector: '#search',
|
||
debug: false // Set debug to true if you want to inspect the dropdown
|
||
});
|
||
document.querySelector('.search .close').addEventListener('click', function(ev) {
|
||
ev.preventDefault();
|
||
document.querySelector('.search-container').style.display = 'none';
|
||
});
|
||
document.querySelector('.show-search').addEventListener('click', function(ev) {
|
||
ev.preventDefault();
|
||
document.querySelector('.search-container').style.display = 'block';
|
||
document.getElementById('toggle').checked = false;
|
||
document.querySelector('.search-container input').focus();
|
||
});
|
||
</script>
|
||
</body>
|
||
</html>
|