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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>Line Chart | Chart.js</title>
<meta name="generator" content="VuePress 1.8.2">
<link rel="icon" href="/docs/3.0.0/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
<link rel="preload" href="/docs/3.0.0/assets/css/0.styles.d1176108.css" as="style"><link rel="preload" href="/docs/3.0.0/assets/js/app.87478e1f.js" as="script"><link rel="preload" href="/docs/3.0.0/assets/js/2.dd802d82.js" as="script"><link rel="preload" href="/docs/3.0.0/assets/js/135.cd052bad.js" as="script"><link rel="preload" href="/docs/3.0.0/assets/js/3.f4a41186.js" as="script"><link rel="prefetch" href="/docs/3.0.0/assets/js/10.d01f0a05.js"><link rel="prefetch" href="/docs/3.0.0/assets/js/100.8bb5059e.js"><link rel="prefetch" href="/docs/3.0.0/assets/js/101.f681b5de.js"><link rel="prefetch" href="/docs/3.0.0/assets/js/102.7c60c881.js"><link rel="prefetch" href="/docs/3.0.0/assets/js/103.6d187d49.js"><link rel="prefetch" href="/docs/3.0.0/assets/js/104.583cd3e4.js"><link rel="prefetch" href="/docs/3.0.0/assets/js/105.e79e58ce.js"><link rel="prefetch" href="/docs/3.0.0/assets/js/106.c92ae374.js"><link rel="prefetch" href="/docs/3.0.0/assets/js/107.b2bf9c1b.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/3.0.0/" 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 open"><span>Chart Types</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/3.0.0/charts/line.html" aria-current="page" class="active sidebar-link">Line Chart</a></li><li><a href="/docs/3.0.0/charts/bar.html" class="sidebar-link">Bar Chart</a></li><li><a href="/docs/3.0.0/charts/radar.html" class="sidebar-link">Radar Chart</a></li><li><a href="/docs/3.0.0/charts/doughnut.html" class="sidebar-link">Doughnut and Pie Charts</a></li><li><a href="/docs/3.0.0/charts/polar.html" class="sidebar-link">Polar Area Chart</a></li><li><a href="/docs/3.0.0/charts/bubble.html" class="sidebar-link">Bubble Chart</a></li><li><a href="/docs/3.0.0/charts/scatter.html" class="sidebar-link">Scatter Chart</a></li><li><a href="/docs/3.0.0/charts/area.html" class="sidebar-link">Area Chart</a></li><li><a href="/docs/3.0.0/charts/mixed.html" class="sidebar-link">Mixed Chart Types</a></li></ul></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"><span>Developers</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="line-chart"><a href="#line-chart" class="header-anchor">#</a> Line Chart</h1> <p>A line chart is a way of plotting data points on a line. Often, it is used to show trend data, or the comparison of two data sets.</p> <div class="chart-editor" data-v-365c20ab><div class="chart-view" data-v-365c20ab><canvas></canvas></div> <div class="chart-actions" data-v-2afd21f1 data-v-365c20ab></div> <div class="code-editor" data-v-66ca8197 data-v-365c20ab><div class="code-editor-header" data-v-66ca8197><div class="code-editor-tabs" data-v-66ca8197><button class="code-editor-tab active" data-v-66ca8197>
config
</button><button class="code-editor-tab" data-v-66ca8197>
setup
</button></div> <div class="code-editor-tools" data-v-66ca8197><!----> <a href="https://github.com/chartjs/Chart.js/blob/master/docs/charts/line.md" title="View on GitHub" target="_blank" class="code-editor-tool fab fa-github fa-lg" data-v-66ca8197></a></div></div> <div class="code-editor-views" data-v-66ca8197><div class="editor-textarea ps" data-v-05f11386 data-v-66ca8197><div class="editor-textarea-content" data-v-05f11386><div class="prism-editor-wrapper" data-v-05f11386><div class="prism-editor__container"><textarea spellCheck="false" autocapitalize="off" autocomplete="off" autocorrect="off" data-gramm="false" placeholder="" data-testid="textarea" class="prism-editor__textarea">const config = {
type: 'line',
data: data,
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> config <span class="token operator">=</span> <span class="token punctuation">{</span>
type<span class="token operator">:</span> <span class="token string">'line'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> data<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span><br /></pre></div></div></div></div><div class="editor-textarea ps" style="display:none;" data-v-05f11386 data-v-66ca8197><div class="editor-textarea-content" data-v-05f11386><div class="prism-editor-wrapper" data-v-05f11386><div class="prism-editor__container"><textarea spellCheck="false" autocapitalize="off" autocomplete="off" autocorrect="off" data-gramm="false" placeholder="" data-testid="textarea" class="prism-editor__textarea">const labels = Utils.months({count: 7});
const data = {
labels: labels,
datasets: [{
label: 'My First Dataset',
data: [65, 59, 80, 81, 56, 55, 40],
fill: false,
borderColor: 'rgb(75, 192, 192)',
tension: 0.1
}]
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> labels <span class="token operator">=</span> Utils<span class="token punctuation">.</span><span class="token function">months</span><span class="token punctuation">(</span><span class="token punctuation">{</span>count<span class="token operator">:</span> <span class="token number">7</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> data <span class="token operator">=</span> <span class="token punctuation">{</span>
labels<span class="token operator">:</span> labels<span class="token punctuation">,</span>
datasets<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>
label<span class="token operator">:</span> <span class="token string">'My First Dataset'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token number">65</span><span class="token punctuation">,</span> <span class="token number">59</span><span class="token punctuation">,</span> <span class="token number">80</span><span class="token punctuation">,</span> <span class="token number">81</span><span class="token punctuation">,</span> <span class="token number">56</span><span class="token punctuation">,</span> <span class="token number">55</span><span class="token punctuation">,</span> <span class="token number">40</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
fill<span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
borderColor<span class="token operator">:</span> <span class="token string">'rgb(75, 192, 192)'</span><span class="token punctuation">,</span>
tension<span class="token operator">:</span> <span class="token number">0.1</span>
<span class="token punctuation">}</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span><br /></pre></div></div></div></div></div></div></div><h2 id="example-usage"><a href="#example-usage" class="header-anchor">#</a> Example Usage</h2> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">var</span> myLineChart <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>
type<span class="token operator">:</span> <span class="token string">'line'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> data<span class="token punctuation">,</span>
options<span class="token operator">:</span> options
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="dataset-properties"><a href="#dataset-properties" class="header-anchor">#</a> Dataset Properties</h2> <p>The line chart allows a number of properties to be specified for each dataset. These are used to set display properties for a specific dataset. For example, the colour of a line is generally set this way.</p> <table><thead><tr><th>Name</th> <th>Type</th> <th style="text-align:center;"><a href="/docs/3.0.0/general/options.html#scriptable-options">Scriptable</a></th> <th style="text-align:center;"><a href="/docs/3.0.0/general/options.html#indexable-options">Indexable</a></th> <th>Default</th></tr></thead> <tbody><tr><td><a href="#line-styling"><code>backgroundColor</code></a></td> <td><a href="/docs/3.0.0/general/colors.html"><code>Color</code></a></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>'rgba(0, 0, 0, 0.1)'</code></td></tr> <tr><td><a href="#line-styling"><code>borderCapStyle</code></a></td> <td><code>string</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>'butt'</code></td></tr> <tr><td><a href="#line-styling"><code>borderColor</code></a></td> <td><a href="/docs/3.0.0/general/colors.html"><code>Color</code></a></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>'rgba(0, 0, 0, 0.1)'</code></td></tr> <tr><td><a href="#line-styling"><code>borderDash</code></a></td> <td><code>number[]</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>[]</code></td></tr> <tr><td><a href="#line-styling"><code>borderDashOffset</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>0.0</code></td></tr> <tr><td><a href="#line-styling"><code>borderJoinStyle</code></a></td> <td><code>string</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>'miter'</code></td></tr> <tr><td><a href="#line-styling"><code>borderWidth</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>3</code></td></tr> <tr><td><a href="#general"><code>clip</code></a></td> <td><code>number</code>|<code>object</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td><code>undefined</code></td></tr> <tr><td><a href="#data-structure"><code>data</code></a></td> <td><code>object</code>|<code>object[]</code>|<code>number[]</code>|<code>string[]</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td><strong>required</strong></td></tr> <tr><td><a href="#cubicinterpolationmode"><code>cubicInterpolationMode</code></a></td> <td><code>string</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>'default'</code></td></tr> <tr><td><a href="#line-styling"><code>fill</code></a></td> <td><code>boolean</code>|<code>string</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>false</code></td></tr> <tr><td><a href="#line-styling"><code>hoverBackgroundColor</code></a></td> <td><a href="/docs/3.0.0/general/colors.html"><code>Color</code></a></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>undefined</code></td></tr> <tr><td><a href="#line-styling"><code>hoverBorderCapStyle</code></a></td> <td><code>string</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>undefined</code></td></tr> <tr><td><a href="#line-styling"><code>hoverBorderColor</code></a></td> <td><a href="/docs/3.0.0/general/colors.html"><code>Color</code></a></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>undefined</code></td></tr> <tr><td><a href="#line-styling"><code>hoverBorderDash</code></a></td> <td><code>number[]</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>undefined</code></td></tr> <tr><td><a href="#line-styling"><code>hoverBorderDashOffset</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>undefined</code></td></tr> <tr><td><a href="#line-styling"><code>hoverBorderJoinStyle</code></a></td> <td><code>string</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>undefined</code></td></tr> <tr><td><a href="#line-styling"><code>hoverBorderWidth</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">-</td> <td><code>undefined</code></td></tr> <tr><td><a href="#general"><code>indexAxis</code></a></td> <td><code>string</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td><code>'x'</code></td></tr> <tr><td><a href="#general"><code>label</code></a></td> <td><code>string</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td><code>''</code></td></tr> <tr><td><a href="#line-styling"><code>tension</code></a></td> <td><code>number</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td><code>0</code></td></tr> <tr><td><a href="#general"><code>order</code></a></td> <td><code>number</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td><code>0</code></td></tr> <tr><td><a href="#point-styling"><code>pointBackgroundColor</code></a></td> <td><code>Color</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>'rgba(0, 0, 0, 0.1)'</code></td></tr> <tr><td><a href="#point-styling"><code>pointBorderColor</code></a></td> <td><code>Color</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>'rgba(0, 0, 0, 0.1)'</code></td></tr> <tr><td><a href="#point-styling"><code>pointBorderWidth</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>1</code></td></tr> <tr><td><a href="#point-styling"><code>pointHitRadius</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>1</code></td></tr> <tr><td><a href="#interactions"><code>pointHoverBackgroundColor</code></a></td> <td><code>Color</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>undefined</code></td></tr> <tr><td><a href="#interactions"><code>pointHoverBorderColor</code></a></td> <td><code>Color</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>undefined</code></td></tr> <tr><td><a href="#interactions"><code>pointHoverBorderWidth</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>1</code></td></tr> <tr><td><a href="#interactions"><code>pointHoverRadius</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>4</code></td></tr> <tr><td><a href="#point-styling"><code>pointRadius</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>3</code></td></tr> <tr><td><a href="#point-styling"><code>pointRotation</code></a></td> <td><code>number</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>0</code></td></tr> <tr><td><a href="#point-styling"><code>pointStyle</code></a></td> <td><code>string</code>|<code>Image</code></td> <td style="text-align:center;">Yes</td> <td style="text-align:center;">Yes</td> <td><code>'circle'</code></td></tr> <tr><td><a href="#line-styling"><code>showLine</code></a></td> <td><code>boolean</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td><code>true</code></td></tr> <tr><td><a href="#line-styling"><code>spanGaps</code></a></td> <td><code>boolean</code>|<code>number</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td><code>undefined</code></td></tr> <tr><td><a href="#stepped"><code>stepped</code></a></td> <td><code>boolean</code>|<code>string</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td><code>false</code></td></tr> <tr><td><a href="#general"><code>xAxisID</code></a></td> <td><code>string</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td>first x axis</td></tr> <tr><td><a href="#general"><code>yAxisID</code></a></td> <td><code>string</code></td> <td style="text-align:center;">-</td> <td style="text-align:center;">-</td> <td>first y axis</td></tr></tbody></table> <h3 id="general"><a href="#general" class="header-anchor">#</a> General</h3> <table><thead><tr><th>Name</th> <th>Description</th></tr></thead> <tbody><tr><td><code>clip</code></td> <td>How to clip relative to chartArea. Positive value allows overflow, negative value clips that many pixels inside chartArea. <code>0</code> = clip at chartArea. Clipping can also be configured per side: <code>clip: {left: 5, top: false, right: -2, bottom: 0}</code></td></tr> <tr><td><code>indexAxis</code></td> <td>The base axis of the dataset. <code>'x'</code> for horizontal lines and <code>'y'</code> for vertical lines.</td></tr> <tr><td><code>label</code></td> <td>The label for the dataset which appears in the legend and tooltips.</td></tr> <tr><td><code>order</code></td> <td>The drawing order of dataset. Also affects order for stacking, tooltip, and legend.</td></tr> <tr><td><code>xAxisID</code></td> <td>The ID of the x-axis to plot this dataset on.</td></tr> <tr><td><code>yAxisID</code></td> <td>The ID of the y-axis to plot this dataset on.</td></tr></tbody></table> <h3 id="point-styling"><a href="#point-styling" class="header-anchor">#</a> Point Styling</h3> <p>The style of each point can be controlled with the following properties:</p> <table><thead><tr><th>Name</th> <th>Description</th></tr></thead> <tbody><tr><td><code>pointBackgroundColor</code></td> <td>The fill color for points.</td></tr> <tr><td><code>pointBorderColor</code></td> <td>The border color for points.</td></tr> <tr><td><code>pointBorderWidth</code></td> <td>The width of the point border in pixels.</td></tr> <tr><td><code>pointHitRadius</code></td> <td>The pixel size of the non-displayed point that reacts to mouse events.</td></tr> <tr><td><code>pointRadius</code></td> <td>The radius of the point shape. If set to 0, the point is not rendered.</td></tr> <tr><td><code>pointRotation</code></td> <td>The rotation of the point in degrees.</td></tr> <tr><td><code>pointStyle</code></td> <td>Style of the point. <a href="/docs/3.0.0/configuration/elements.html#point-styles">more...</a></td></tr></tbody></table> <p>All these values, if <code>undefined</code>, fallback first to the dataset options then to the associated <a href="/docs/3.0.0/configuration/elements.html#point-configuration"><code>elements.point.*</code></a> options.</p> <h3 id="line-styling"><a href="#line-styling" class="header-anchor">#</a> Line Styling</h3> <p>The style of the line can be controlled with the following properties:</p> <table><thead><tr><th>Name</th> <th>Description</th></tr></thead> <tbody><tr><td><code>backgroundColor</code></td> <td>The line fill color.</td></tr> <tr><td><code>borderCapStyle</code></td> <td>Cap style of the line. See <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineCap" target="_blank" rel="noopener noreferrer">MDN<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>.</td></tr> <tr><td><code>borderColor</code></td> <td>The line color.</td></tr> <tr><td><code>borderDash</code></td> <td>Length and spacing of dashes. See <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash" target="_blank" rel="noopener noreferrer">MDN<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>.</td></tr> <tr><td><code>borderDashOffset</code></td> <td>Offset for line dashes. See <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineDashOffset" target="_blank" rel="noopener noreferrer">MDN<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>.</td></tr> <tr><td><code>borderJoinStyle</code></td> <td>Line joint style. See <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineJoin" target="_blank" rel="noopener noreferrer">MDN<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>.</td></tr> <tr><td><code>borderWidth</code></td> <td>The line width (in pixels).</td></tr> <tr><td><code>fill</code></td> <td>How to fill the area under the line. See <a href="/docs/3.0.0/charts/area.html">area charts</a>.</td></tr> <tr><td><code>tension</code></td> <td>Bezier curve tension of the line. Set to 0 to draw straightlines. This option is ignored if monotone cubic interpolation is used.</td></tr> <tr><td><code>showLine</code></td> <td>If false, the line is not drawn for this dataset.</td></tr> <tr><td><code>spanGaps</code></td> <td>If true, lines will be drawn between points with no or null data. If false, points with <code>null</code> data will create a break in the line. Can also be a number specifying the maximum gap length to span. The unit of the value depends on the scale used.</td></tr></tbody></table> <p>If the value is <code>undefined</code>, <code>showLine</code> and <code>spanGaps</code> fallback to the associated <a href="#configuration-options">chart configuration options</a>. The rest of the values fallback to the associated <a href="/docs/3.0.0/configuration/elements.html#line-configuration"><code>elements.line.*</code></a> options.</p> <h3 id="interactions"><a href="#interactions" class="header-anchor">#</a> Interactions</h3> <p>The interaction with each point can be controlled with the following properties:</p> <table><thead><tr><th>Name</th> <th>Description</th></tr></thead> <tbody><tr><td><code>pointHoverBackgroundColor</code></td> <td>Point background color when hovered.</td></tr> <tr><td><code>pointHoverBorderColor</code></td> <td>Point border color when hovered.</td></tr> <tr><td><code>pointHoverBorderWidth</code></td> <td>Border width of point when hovered.</td></tr> <tr><td><code>pointHoverRadius</code></td> <td>The radius of the point when hovered.</td></tr></tbody></table> <h3 id="cubicinterpolationmode"><a href="#cubicinterpolationmode" class="header-anchor">#</a> cubicInterpolationMode</h3> <p>The following interpolation modes are supported.</p> <ul><li><code>'default'</code></li> <li><code>'monotone'</code></li></ul> <p>The <code>'default'</code> algorithm uses a custom weighted cubic interpolation, which produces pleasant curves for all types of datasets.</p> <p>The <code>'monotone'</code> algorithm is more suited to <code>y = f(x)</code> datasets: it preserves monotonicity (or piecewise monotonicity) of the dataset being interpolated, and ensures local extremums (if any) stay at input data points.</p> <p>If left untouched (<code>undefined</code>), the global <code>options.elements.line.cubicInterpolationMode</code> property is used.</p> <h3 id="stepped"><a href="#stepped" class="header-anchor">#</a> Stepped</h3> <p>The following values are supported for <code>stepped</code>.</p> <ul><li><code>false</code>: No Step Interpolation (default)</li> <li><code>true</code>: Step-before Interpolation (eq. <code>'before'</code>)</li> <li><code>'before'</code>: Step-before Interpolation</li> <li><code>'after'</code>: Step-after Interpolation</li> <li><code>'middle'</code>: Step-middle Interpolation</li></ul> <p>If the <code>stepped</code> value is set to anything other than false, <code>tension</code> will be ignored.</p> <h2 id="configuration-options"><a href="#configuration-options" class="header-anchor">#</a> Configuration Options</h2> <p>The line chart defines the following configuration options. These options are looked up on access, and form together with the global chart configuration, <code>Chart.defaults</code>, the options of the chart.</p> <table><thead><tr><th>Name</th> <th>Type</th> <th>Default</th> <th>Description</th></tr></thead> <tbody><tr><td><code>showLine</code></td> <td><code>boolean</code></td> <td><code>true</code></td> <td>If false, the lines between points are not drawn.</td></tr> <tr><td><code>spanGaps</code></td> <td><code>boolean</code>|<code>number</code></td> <td><code>false</code></td> <td>If true, lines will be drawn between points with no or null data. If false, points with <code>null</code> data will create a break in the line. Can also be a number specifying the maximum gap length to span. The unit of the value depends on the scale used.</td></tr></tbody></table> <h2 id="default-options"><a href="#default-options" class="header-anchor">#</a> Default Options</h2> <p>It is common to want to apply a configuration setting to all created line charts. The global line chart settings are stored in <code>Chart.overrides.line</code>. Changing the global options only affects charts created after the change. Existing charts are not changed.</p> <p>For example, to configure all line charts with <code>spanGaps = true</code> you would do:</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code>Chart<span class="token punctuation">.</span>overrides<span class="token punctuation">.</span>line<span class="token punctuation">.</span>spanGaps <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="data-structure"><a href="#data-structure" class="header-anchor">#</a> Data Structure</h2> <p>All of the supported <a href="/docs/3.0.0/general/data-structures.html">data structures</a> can be used with line charts.</p> <h2 id="stacked-area-chart"><a href="#stacked-area-chart" class="header-anchor">#</a> Stacked Area Chart</h2> <p>Line charts can be configured into stacked area charts by changing the settings on the y-axis to enable stacking. Stacked area charts can be used to show how one data trend is made up of a number of smaller pieces.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">var</span> stackedLine <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>
type<span class="token operator">:</span> <span class="token string">'line'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> data<span class="token punctuation">,</span>
options<span class="token operator">:</span> <span class="token punctuation">{</span>
scales<span class="token operator">:</span> <span class="token punctuation">{</span>
y<span class="token operator">:</span> <span class="token punctuation">{</span>
stacked<span class="token operator">:</span> <span class="token boolean">true</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><h2 id="vertical-line-chart"><a href="#vertical-line-chart" class="header-anchor">#</a> Vertical Line Chart</h2> <p>A vertical line chart is a variation on the horizontal line chart.
To achieve this you will have to set the <code>indexAxis</code> property in the options object to <code>'y'</code>.
The default for this property is <code>'x'</code> and thus will show horizontal lines.</p> <div class="chart-editor" data-v-365c20ab><div class="chart-view" data-v-365c20ab><canvas></canvas></div> <div class="chart-actions" data-v-2afd21f1 data-v-365c20ab></div> <div class="code-editor" data-v-66ca8197 data-v-365c20ab><div class="code-editor-header" data-v-66ca8197><div class="code-editor-tabs" data-v-66ca8197><button class="code-editor-tab active" data-v-66ca8197>
config
</button><button class="code-editor-tab" data-v-66ca8197>
setup
</button></div> <div class="code-editor-tools" data-v-66ca8197><!----> <a href="https://github.com/chartjs/Chart.js/blob/master/docs/charts/line.md" title="View on GitHub" target="_blank" class="code-editor-tool fab fa-github fa-lg" data-v-66ca8197></a></div></div> <div class="code-editor-views" data-v-66ca8197><div class="editor-textarea ps" data-v-05f11386 data-v-66ca8197><div class="editor-textarea-content" data-v-05f11386><div class="prism-editor-wrapper" data-v-05f11386><div class="prism-editor__container"><textarea spellCheck="false" autocapitalize="off" autocomplete="off" autocorrect="off" data-gramm="false" placeholder="" data-testid="textarea" class="prism-editor__textarea">const config = {
type: 'line',
data: data,
options: {
indexAxis: 'y',
scales: {
x: {
beginAtZero: true
}
}
}
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> config <span class="token operator">=</span> <span class="token punctuation">{</span>
type<span class="token operator">:</span> <span class="token string">'line'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> data<span class="token punctuation">,</span>
options<span class="token operator">:</span> <span class="token punctuation">{</span>
indexAxis<span class="token operator">:</span> <span class="token string">'y'</span><span class="token punctuation">,</span>
scales<span class="token operator">:</span> <span class="token punctuation">{</span>
x<span class="token operator">:</span> <span class="token punctuation">{</span>
beginAtZero<span class="token operator">:</span> <span class="token boolean">true</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><br /></pre></div></div></div></div><div class="editor-textarea ps" style="display:none;" data-v-05f11386 data-v-66ca8197><div class="editor-textarea-content" data-v-05f11386><div class="prism-editor-wrapper" data-v-05f11386><div class="prism-editor__container"><textarea spellCheck="false" autocapitalize="off" autocomplete="off" autocorrect="off" data-gramm="false" placeholder="" data-testid="textarea" class="prism-editor__textarea">const labels = Utils.months({count: 7});
const data = {
labels: labels,
datasets: [{
axis: 'y',
label: 'My First Dataset',
data: [65, 59, 80, 81, 56, 55, 40],
fill: false,
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(255, 159, 64, 0.2)',
'rgba(255, 205, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(201, 203, 207, 0.2)'
],
borderColor: [
'rgb(255, 99, 132)',
'rgb(255, 159, 64)',
'rgb(255, 205, 86)',
'rgb(75, 192, 192)',
'rgb(54, 162, 235)',
'rgb(153, 102, 255)',
'rgb(201, 203, 207)'
],
borderWidth: 1
}]
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> labels <span class="token operator">=</span> Utils<span class="token punctuation">.</span><span class="token function">months</span><span class="token punctuation">(</span><span class="token punctuation">{</span>count<span class="token operator">:</span> <span class="token number">7</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> data <span class="token operator">=</span> <span class="token punctuation">{</span>
labels<span class="token operator">:</span> labels<span class="token punctuation">,</span>
datasets<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>
axis<span class="token operator">:</span> <span class="token string">'y'</span><span class="token punctuation">,</span>
label<span class="token operator">:</span> <span class="token string">'My First Dataset'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token number">65</span><span class="token punctuation">,</span> <span class="token number">59</span><span class="token punctuation">,</span> <span class="token number">80</span><span class="token punctuation">,</span> <span class="token number">81</span><span class="token punctuation">,</span> <span class="token number">56</span><span class="token punctuation">,</span> <span class="token number">55</span><span class="token punctuation">,</span> <span class="token number">40</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
fill<span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
backgroundColor<span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token string">'rgba(255, 99, 132, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(255, 159, 64, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(255, 205, 86, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(75, 192, 192, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(54, 162, 235, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(153, 102, 255, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(201, 203, 207, 0.2)'</span>
<span class="token punctuation">]</span><span class="token punctuation">,</span>
borderColor<span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token string">'rgb(255, 99, 132)'</span><span class="token punctuation">,</span>
<span class="token string">'rgb(255, 159, 64)'</span><span class="token punctuation">,</span>
<span class="token string">'rgb(255, 205, 86)'</span><span class="token punctuation">,</span>
<span class="token string">'rgb(75, 192, 192)'</span><span class="token punctuation">,</span>
<span class="token string">'rgb(54, 162, 235)'</span><span class="token punctuation">,</span>
<span class="token string">'rgb(153, 102, 255)'</span><span class="token punctuation">,</span>
<span class="token string">'rgb(201, 203, 207)'</span>
<span class="token punctuation">]</span><span class="token punctuation">,</span>
borderWidth<span class="token operator">:</span> <span class="token number">1</span>
<span class="token punctuation">}</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span><br /></pre></div></div></div></div></div></div></div><h2 id="example"><a href="#example" class="header-anchor">#</a> Example</h2> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">var</span> myLineChart <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>
type<span class="token operator">:</span> <span class="token string">'line'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> data<span class="token punctuation">,</span>
options<span class="token operator">:</span> <span class="token punctuation">{</span>
indexAxis<span class="token operator">:</span> <span class="token string">'y'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h3 id="config-options"><a href="#config-options" class="header-anchor">#</a> Config Options</h3> <p>The configuration options for the vertical line chart are the same as for the <a href="#configuration-options">line chart</a>. However, any options specified on the x-axis in a line chart, are applied to the y-axis in a vertical line chart.</p> <h2 id="internal-data-format"><a href="#internal-data-format" class="header-anchor">#</a> Internal data format</h2> <p><code>{x, y}</code></p></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">3/30/2021, 10:32:39 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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