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<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Labeling Axes | Chart.js</title>
<meta name="generator" content="VuePress 1.9.7">
<link rel="icon" href="/docs/4.2.0/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
<link rel="preload" href="/docs/4.2.0/assets/css/0.styles.09d849d4.css" as="style"><link rel="preload" href="/docs/4.2.0/assets/js/app.2a761adc.js" as="script"><link rel="preload" href="/docs/4.2.0/assets/js/2.861276ab.js" as="script"><link rel="preload" href="/docs/4.2.0/assets/js/140.37ff850f.js" as="script"><link rel="prefetch" href="/docs/4.2.0/assets/js/10.a05d7e0c.js"><link rel="prefetch" href="/docs/4.2.0/assets/js/100.89490107.js"><link rel="prefetch" href="/docs/4.2.0/assets/js/101.57734ea8.js"><link rel="prefetch" href="/docs/4.2.0/assets/js/102.dfc0dcf8.js"><link rel="prefetch" href="/docs/4.2.0/assets/js/103.5912eead.js"><link rel="prefetch" href="/docs/4.2.0/assets/js/104.a8187c37.js"><link rel="prefetch" href="/docs/4.2.0/assets/js/105.aabb7deb.js"><link rel="prefetch" href="/docs/4.2.0/assets/js/106.e1c47c0f.js"><link rel="prefetch" href="/docs/4.2.0/assets/js/107.8992624b.js"><link rel="prefetch" href="/docs/4.2.0/assets/js/108.1eea7159.js"><link rel="prefetch" 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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/4.2.0/" 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 open"><span>Axes</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/4.2.0/axes/" aria-current="page" class="sidebar-link">Axes</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Cartesian</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Radial</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/docs/4.2.0/axes/labelling.html" aria-current="page" class="active sidebar-link">Labeling Axes</a></li><li><a href="/docs/4.2.0/axes/styling.html" class="sidebar-link">Styling</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Developers</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Migration</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="labeling-axes"><a href="#labeling-axes" class="header-anchor">#</a> Labeling Axes</h1> <p>When creating a chart, you want to tell the viewer what data they are viewing. To do this, you need to label the axis.</p> <h2 id="scale-title-configuration"><a href="#scale-title-configuration" class="header-anchor">#</a> Scale Title Configuration</h2> <p>Namespace: <code>options.scales[scaleId].title</code>, it defines options for the scale title. Note that this only applies to cartesian axes.</p> <table><thead><tr><th>Name</th> <th>Type</th> <th>Default</th> <th>Description</th></tr></thead> <tbody><tr><td><code>display</code></td> <td><code>boolean</code></td> <td><code>false</code></td> <td>If true, display the axis title.</td></tr> <tr><td><code>align</code></td> <td><code>string</code></td> <td><code>'center'</code></td> <td>Alignment of the axis title. Possible options are <code>'start'</code>, <code>'center'</code> and <code>'end'</code></td></tr> <tr><td><code>text</code></td> <td><code>string</code>|<code>string[]</code></td> <td><code>''</code></td> <td>The text for the title. (i.e. "# of People" or "Response Choices").</td></tr> <tr><td><code>color</code></td> <td><a href="/docs/4.2.0/general/colors.html"><code>Color</code></a></td> <td><code>Chart.defaults.color</code></td> <td>Color of label.</td></tr> <tr><td><code>font</code></td> <td><code>Font</code></td> <td><code>Chart.defaults.font</code></td> <td>See <a href="/docs/4.2.0/general/fonts.html">Fonts</a></td></tr> <tr><td><code>padding</code></td> <td><a href="/docs/4.2.0/general/padding.html"><code>Padding</code></a></td> <td><code>4</code></td> <td>Padding to apply around scale labels. Only <code>top</code>, <code>bottom</code> and <code>y</code> are implemented.</td></tr></tbody></table> <h2 id="creating-custom-tick-formats"><a href="#creating-custom-tick-formats" class="header-anchor">#</a> Creating Custom Tick Formats</h2> <p>It is also common to want to change the tick marks to include information about the data type. For example, adding a dollar sign ('$').
To do this, you need to override the <code>ticks.callback</code> method in the axis configuration.</p> <p>The method receives 3 arguments:</p> <ul><li><code>value</code> - the tick value in the <strong>internal data format</strong> of the associated scale. For time scale, it is a timestamp.</li> <li><code>index</code> - the tick index in the ticks array.</li> <li><code>ticks</code> - the array containing all of the <a href="../api/interfaces/Tick">tick objects</a>.</li></ul> <p>The call to the method is scoped to the scale. <code>this</code> inside the method is the scale object.</p> <p>If the callback returns <code>null</code> or <code>undefined</code> the associated grid line will be hidden.</p> <div class="custom-block tip"><p class="custom-block-title">TIP</p> <p>The <a href="../axes/cartesian/category">category axis</a>, which is the default x-axis for line and bar charts, uses the <code>index</code> as internal data format. For accessing the label, use <code>this.getLabelForValue(value)</code>. <a href="/docs/4.2.0/api/classes/Scale.html#getlabelforvalue">API: getLabelForValue</a></p></div> <p>In the following example, every label of the Y-axis would be displayed with a dollar sign at the front.</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">type</span><span class="token operator">:</span> <span class="token string">'line'</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><span class="token operator">:</span> data<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">scales</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">y</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">ticks</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token comment">// Include a dollar sign in the ticks</span>
<span class="token function-variable function">callback</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">value<span class="token punctuation">,</span> index<span class="token punctuation">,</span> ticks</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token string">'$'</span> <span class="token operator">+</span> value<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><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>Keep in mind that overriding <code>ticks.callback</code> means that you are responsible for all formatting of the label. Depending on your use case, you may want to call the default formatter and then modify its output. In the example above, that would look like:</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code> <span class="token comment">// call the default formatter, forwarding `this`</span>
<span class="token keyword">return</span> <span class="token string">'$'</span> <span class="token operator">+</span> Chart<span class="token punctuation">.</span>Ticks<span class="token punctuation">.</span>formatters<span class="token punctuation">.</span><span class="token function">numeric</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token punctuation">[</span>value<span class="token punctuation">,</span> index<span class="token punctuation">,</span> ticks<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>Related samples:</p> <ul><li><a href="../samples/scale-options/ticks">Tick configuration sample</a></li></ul></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">1/18/2023, 1:35:00 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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