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    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><a href="/docs/3.9.1/" aria-current="page" class="sidebar-link">Chart.js</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Getting Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>General</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Configuration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Chart Types</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Axes</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Developers</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/3.9.1/developers/" aria-current="page" class="sidebar-link">Developers</a></li><li><a href="/docs/3.9.1/developers/api.html" class="sidebar-link">API</a></li><li><a href="/docs/3.9.1/developers/axes.html" class="sidebar-link">New Axes</a></li><li><a href="/docs/3.9.1/developers/charts.html" class="sidebar-link">New Charts</a></li><li><a href="/docs/3.9.1/developers/contributing.html" class="sidebar-link">Contributing</a></li><li><a href="/docs/3.9.1/developers/plugins.html" aria-current="page" class="active sidebar-link">Plugins</a></li><li><a href="/docs/3.9.1/developers/publishing.html" class="sidebar-link">Publishing an extension</a></li><li><a href="/docs/3.9.1/api/" class="sidebar-link">TypeDoc</a></li><li><a href="/docs/3.9.1/developers/updates.html" class="sidebar-link">Updating Charts</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="plugins"><a href="#plugins" class="header-anchor">#</a> Plugins</h1> <p>Plugins are the most efficient way to customize or change the default behavior of a chart. They have been introduced at <a href="https://github.com/chartjs/Chart.js/releases/tag/2.1.0" target="_blank" rel="noopener noreferrer">version 2.1.0<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> (global plugins only) and extended at <a href="https://github.com/chartjs/Chart.js/releases/tag/v2.5.0" target="_blank" rel="noopener noreferrer">version 2.5.0<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> (per chart plugins and options).</p> <h2 id="using-plugins"><a href="#using-plugins" class="header-anchor">#</a> Using plugins</h2> <p>Plugins can be shared between chart instances:</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> plugin <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token comment">/* plugin implementation */</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">// chart1 and chart2 use &quot;plugin&quot;</span>
<span class="token keyword">const</span> chart1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span>plugin<span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> chart2 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span>plugin<span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// chart3 doesn't use &quot;plugin&quot;</span>
<span class="token keyword">const</span> chart3 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>Plugins can also be defined directly in the chart <code>plugins</code> config (a.k.a. <em>inline plugins</em>):</p> <div class="custom-block warning"><p class="custom-block-title">WARNING</p> <p><em>inline</em> plugins are not registered. Some plugins require registering, i.e. can't be used <em>inline</em>.</p></div> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> chart <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>
        <span class="token function-variable function">beforeInit</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">chart<span class="token punctuation">,</span> args<span class="token punctuation">,</span> options</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token comment">//..</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>However, this approach is not ideal when the customization needs to apply to many charts.</p> <h2 id="global-plugins"><a href="#global-plugins" class="header-anchor">#</a> Global plugins</h2> <p>Plugins can be registered globally to be applied on all charts (a.k.a. <em>global plugins</em>):</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code>Chart<span class="token punctuation">.</span><span class="token function">register</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    <span class="token comment">// plugin implementation</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><div class="custom-block warning"><p class="custom-block-title">WARNING</p> <p><em>inline</em> plugins can't be registered globally.</p></div> <h2 id="configuration"><a href="#configuration" class="header-anchor">#</a> Configuration</h2> <h3 id="plugin-id"><a href="#plugin-id" class="header-anchor">#</a> Plugin ID</h3> <p>Plugins must define a unique id in order to be configurable.</p> <p>This id should follow the <a href="https://docs.npmjs.com/files/package.json#name" target="_blank" rel="noopener noreferrer">npm package name convention<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>:</p> <ul><li>can't start with a dot or an underscore</li> <li>can't contain any non-URL-safe characters</li> <li>can't contain uppercase letters</li> <li>should be something short, but also reasonably descriptive</li></ul> <p>If a plugin is intended to be released publicly, you may want to check the <a href="https://www.npmjs.com/search?q=chartjs-plugin-" target="_blank" rel="noopener noreferrer">registry<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> to see if there's something by that name already. Note that in this case, the package name should be prefixed by <code>chartjs-plugin-</code> to appear in Chart.js plugin registry.</p> <h3 id="plugin-options"><a href="#plugin-options" class="header-anchor">#</a> Plugin options</h3> <p>Plugin options are located under the <code>options.plugins</code> config and are scoped by the plugin ID: <code>options.plugins.{plugin-id}</code>.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> chart <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">foo</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>           <span class="token comment">// chart 'foo' option</span>
        <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            <span class="token literal-property property">p1</span><span class="token operator">:</span> <span class="token punctuation">{</span>
                <span class="token literal-property property">foo</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>   <span class="token comment">// p1 plugin 'foo' option</span>
                <span class="token literal-property property">bar</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
            <span class="token literal-property property">p2</span><span class="token operator">:</span> <span class="token punctuation">{</span>
                <span class="token literal-property property">foo</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>   <span class="token comment">// p2 plugin 'foo' option</span>
                <span class="token literal-property property">bla</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h4 id="disable-plugins"><a href="#disable-plugins" class="header-anchor">#</a> Disable plugins</h4> <p>To disable a global plugin for a specific chart instance, the plugin options must be set to <code>false</code>:</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code>Chart<span class="token punctuation">.</span><span class="token function">register</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    <span class="token literal-property property">id</span><span class="token operator">:</span> <span class="token string">'p1'</span><span class="token punctuation">,</span>
    <span class="token comment">// ...</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> chart <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            <span class="token literal-property property">p1</span><span class="token operator">:</span> <span class="token boolean">false</span>   <span class="token comment">// disable plugin 'p1' for this instance</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>To disable all plugins for a specific chart instance, set <code>options.plugins</code> to <code>false</code>:</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> chart <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token boolean">false</span> <span class="token comment">// all plugins are disabled for this instance</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h4 id="plugin-defaults"><a href="#plugin-defaults" class="header-anchor">#</a> Plugin defaults</h4> <p>You can set default values for your plugin options in the <code>defaults</code> entry of your plugin object. In the example below the canvas will always have a lightgreen backgroundColor unless the user overrides this option in <code>options.plugins.custom_canvas_background_color.color</code>.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> plugin <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">id</span><span class="token operator">:</span> <span class="token string">'custom_canvas_background_color'</span><span class="token punctuation">,</span>
    <span class="token function-variable function">beforeDraw</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token parameter">chart<span class="token punctuation">,</span> args<span class="token punctuation">,</span> options</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">const</span> <span class="token punctuation">{</span>ctx<span class="token punctuation">}</span> <span class="token operator">=</span> chart<span class="token punctuation">;</span>
        ctx<span class="token punctuation">.</span><span class="token function">save</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        ctx<span class="token punctuation">.</span>globalCompositeOperation <span class="token operator">=</span> <span class="token string">'destination-over'</span><span class="token punctuation">;</span>
        ctx<span class="token punctuation">.</span>fillStyle <span class="token operator">=</span> options<span class="token punctuation">.</span>color<span class="token punctuation">;</span>
        ctx<span class="token punctuation">.</span><span class="token function">fillRect</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> chart<span class="token punctuation">.</span>width<span class="token punctuation">,</span> chart<span class="token punctuation">.</span>height<span class="token punctuation">)</span><span class="token punctuation">;</span>
        ctx<span class="token punctuation">.</span><span class="token function">restore</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token literal-property property">defaults</span><span class="token operator">:</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">color</span><span class="token operator">:</span> <span class="token string">'lightGreen'</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="plugin-core-api"><a href="#plugin-core-api" class="header-anchor">#</a> Plugin Core API</h2> <p>Read more about the <a href="../api/interfaces/Plugin">existing plugin extension hooks</a>.</p> <h3 id="chart-initialization"><a href="#chart-initialization" class="header-anchor">#</a> Chart Initialization</h3> <p>Plugins are notified during the initialization process. These hooks can be used to setup data needed for the plugin to operate.</p> <p><img src="/docs/3.9.1/assets/img/init_flowchart.ee5be600.png" alt="Chart.js init flowchart"></p> <h3 id="chart-update"><a href="#chart-update" class="header-anchor">#</a> Chart Update</h3> <p>Plugins are notified throughout the update process.</p> <p><img src="/docs/3.9.1/assets/img/update_flowchart.0556691d.png" alt="Chart.js update flowchart"></p> <h3 id="scale-update"><a href="#scale-update" class="header-anchor">#</a> Scale Update</h3> <p>Plugins are notified throughout the scale update process.</p> <p><img src="/docs/3.9.1/assets/img/scale_flowchart.fa1ab63e.png" alt="Chart.js scale update flowchart"></p> <h3 id="rendering"><a href="#rendering" class="header-anchor">#</a> Rendering</h3> <p>Plugins can interact with the chart throughout the render process. The rendering process is documented in the flowchart below. Each of the green processes is a plugin notification. The red lines indicate how cancelling part of the render process can occur when a plugin returns <code>false</code> from a hook. Not all hooks are cancelable, however, in general most <code>before*</code> hooks can be cancelled.</p> <p><img src="/docs/3.9.1/assets/img/render_flowchart.41a98316.png" alt="Chart.js render pipeline flowchart"></p> <h3 id="event-handling"><a href="#event-handling" class="header-anchor">#</a> Event Handling</h3> <p>Plugins can interact with the chart during the event handling process. The event handling flow is documented in the flowchart below. Each of the green processes is a plugin notification. If a plugin makes changes that require a re-render, the plugin can set <code>args.changed</code> to <code>true</code> to indicate that a render is needed. The built-in tooltip plugin uses this method to indicate when the tooltip has changed.</p> <p><img src="/docs/3.9.1/assets/img/event_flowchart.83015c7a.png" alt="Chart.js event handling flowchart"></p> <h3 id="chart-destroy"><a href="#chart-destroy" class="header-anchor">#</a> Chart destroy</h3> <p>Plugins are notified during the destroy process. These hooks can be used to destroy things that the plugin made and used during its life.
The <code>destroy</code> hook has been deprecated since Chart.js version 3.7.0, use the <code>afterDestroy</code> hook instead.</p> <p><img src="/docs/3.9.1/assets/img/destroy_flowchart.10814816.png" alt="Chart.js destroy flowchart"></p></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">8/3/2022, 12:46:38 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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