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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>Programmatic Event Triggers | Chart.js</title>
<meta name="generator" content="VuePress 1.8.2">
<link rel="icon" href="/docs/3.1.0/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
<link rel="preload" href="/docs/3.1.0/assets/css/0.styles.1623ef7a.css" as="style"><link rel="preload" href="/docs/3.1.0/assets/js/app.0ddc5917.js" as="script"><link rel="preload" href="/docs/3.1.0/assets/js/2.47b832b0.js" as="script"><link rel="preload" href="/docs/3.1.0/assets/js/180.4dbdd10b.js" as="script"><link rel="preload" href="/docs/3.1.0/assets/js/3.f47fb655.js" as="script"><link rel="prefetch" href="/docs/3.1.0/assets/js/10.ceebed1f.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/100.eee663a2.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/101.b9b1b068.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/102.479c4581.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/103.53ead1e1.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/104.5c7d8858.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/105.1d68e09a.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/106.92da18bd.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/107.6f10ac74.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></li></ul></div></div> <a href="https://github.com/chartjs/Chart.js" target="_blank" rel="noopener noreferrer" class="repo-link">
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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><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Bar Charts</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Line Charts</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Other charts</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Area charts</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Scales</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Scale Options</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Legend</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Title</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Tooltip</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Scriptable Options</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Animations</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Advanced</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/3.1.0/samples/advanced/data-decimation.html" class="sidebar-link">Data Decimation</a></li><li><a href="/docs/3.1.0/samples/advanced/progress-bar.html" class="sidebar-link">Animation Progress Bar</a></li><li><a href="/docs/3.1.0/samples/advanced/radial-gradient.html" class="sidebar-link">Radial Gradient</a></li><li><a href="/docs/3.1.0/samples/advanced/linear-gradient.html" class="sidebar-link">Linear Gradient</a></li><li><a href="/docs/3.1.0/samples/advanced/programmatic-events.html" aria-current="page" class="active sidebar-link">Programmatic Event Triggers</a></li><li><a href="/docs/3.1.0/samples/advanced/derived-axis-type.html" class="sidebar-link">Derived Axis Type</a></li><li><a href="/docs/3.1.0/samples/advanced/derived-chart-type.html" class="sidebar-link">Derived Chart Type</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="programmatic-event-triggers"><a href="#programmatic-event-triggers" class="header-anchor">#</a> Programmatic Event Triggers</h1> <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>
hover
</button><button class="code-editor-tab" data-v-66ca8197>
tooltip
</button><button class="code-editor-tab" data-v-66ca8197>
actions
</button><button class="code-editor-tab" 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/samples/advanced/programmatic-events.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">function triggerHover(chart) {
if (chart.getActiveElements().length > 0) {
chart.setActiveElements([]);
} else {
chart.setActiveElements([
{
datasetIndex: 0,
index: 0,
}, {
datasetIndex: 1,
index: 0,
}
]);
}
chart.update();
}</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">function</span> <span class="token function">triggerHover</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>chart<span class="token punctuation">.</span><span class="token function">getActiveElements</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>length <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
chart<span class="token punctuation">.</span><span class="token function">setActiveElements</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 keyword">else</span> <span class="token punctuation">{</span>
chart<span class="token punctuation">.</span><span class="token function">setActiveElements</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
<span class="token punctuation">{</span>
datasetIndex<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
index<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
datasetIndex<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
index<span class="token operator">:</span> <span class="token number">0</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>
chart<span class="token punctuation">.</span><span class="token function">update</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">function triggerTooltip(chart) {
const tooltip = chart.tooltip;
if (tooltip.getActiveElements().length > 0) {
tooltip.setActiveElements([], {x: 0, y: 0});
} else {
const chartArea = chart.chartArea;
tooltip.setActiveElements([
{
datasetIndex: 0,
index: 2,
}, {
datasetIndex: 1,
index: 2,
}
],
{
x: (chartArea.left + chartArea.right) / 2,
y: (chartArea.top + chartArea.bottom) / 2,
});
}
chart.update();
}</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">function</span> <span class="token function">triggerTooltip</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> tooltip <span class="token operator">=</span> chart<span class="token punctuation">.</span>tooltip<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>tooltip<span class="token punctuation">.</span><span class="token function">getActiveElements</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>length <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
tooltip<span class="token punctuation">.</span><span class="token function">setActiveElements</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>x<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span> y<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> chartArea <span class="token operator">=</span> chart<span class="token punctuation">.</span>chartArea<span class="token punctuation">;</span>
tooltip<span class="token punctuation">.</span><span class="token function">setActiveElements</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
<span class="token punctuation">{</span>
datasetIndex<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
index<span class="token operator">:</span> <span class="token number">2</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
datasetIndex<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
index<span class="token operator">:</span> <span class="token number">2</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>
x<span class="token operator">:</span> <span class="token punctuation">(</span>chartArea<span class="token punctuation">.</span>left <span class="token operator">+</span> chartArea<span class="token punctuation">.</span>right<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">2</span><span class="token punctuation">,</span>
y<span class="token operator">:</span> <span class="token punctuation">(</span>chartArea<span class="token punctuation">.</span>top <span class="token operator">+</span> chartArea<span class="token punctuation">.</span>bottom<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">2</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>
chart<span class="token punctuation">.</span><span class="token function">update</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 actions = [
{
name: 'Trigger Hover',
handler: triggerHover
},
{
name: 'Trigger Tooltip',
handler: triggerTooltip
}
];</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> actions <span class="token operator">=</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
name<span class="token operator">:</span> <span class="token string">'Trigger Hover'</span><span class="token punctuation">,</span>
handler<span class="token operator">:</span> triggerHover
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
name<span class="token operator">:</span> <span class="token string">'Trigger Tooltip'</span><span class="token punctuation">,</span>
handler<span class="token operator">:</span> triggerTooltip
<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 config = {
type: 'bar',
data: data,
options: {
},
};</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">'bar'</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>
<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 DATA_COUNT = 7;
const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100};
const labels = Utils.months({count: 7});
const data = {
labels: labels,
datasets: [
{
label: 'Dataset 1',
data: Utils.numbers(NUMBER_CFG),
borderColor: Utils.CHART_COLORS.red,
backgroundColor: Utils.transparentize(Utils.CHART_COLORS.red, 0.5),
hoverBorderWidth: 5,
hoverBorderColor: 'green',
},
{
label: 'Dataset 2',
data: Utils.numbers(NUMBER_CFG),
borderColor: Utils.CHART_COLORS.blue,
backgroundColor: Utils.transparentize(Utils.CHART_COLORS.blue, 0.5),
hoverBorderWidth: 5,
hoverBorderColor: 'green',
}
]
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> <span class="token constant">DATA_COUNT</span> <span class="token operator">=</span> <span class="token number">7</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token constant">NUMBER_CFG</span> <span class="token operator">=</span> <span class="token punctuation">{</span>count<span class="token operator">:</span> <span class="token constant">DATA_COUNT</span><span class="token punctuation">,</span> min<span class="token operator">:</span> <span class="token operator">-</span><span class="token number">100</span><span class="token punctuation">,</span> max<span class="token operator">:</span> <span class="token number">100</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<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">'Dataset 1'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> Utils<span class="token punctuation">.</span><span class="token function">numbers</span><span class="token punctuation">(</span><span class="token constant">NUMBER_CFG</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
borderColor<span class="token operator">:</span> Utils<span class="token punctuation">.</span><span class="token constant">CHART_COLORS</span><span class="token punctuation">.</span>red<span class="token punctuation">,</span>
backgroundColor<span class="token operator">:</span> Utils<span class="token punctuation">.</span><span class="token function">transparentize</span><span class="token punctuation">(</span>Utils<span class="token punctuation">.</span><span class="token constant">CHART_COLORS</span><span class="token punctuation">.</span>red<span class="token punctuation">,</span> <span class="token number">0.5</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
hoverBorderWidth<span class="token operator">:</span> <span class="token number">5</span><span class="token punctuation">,</span>
hoverBorderColor<span class="token operator">:</span> <span class="token string">'green'</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
label<span class="token operator">:</span> <span class="token string">'Dataset 2'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> Utils<span class="token punctuation">.</span><span class="token function">numbers</span><span class="token punctuation">(</span><span class="token constant">NUMBER_CFG</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
borderColor<span class="token operator">:</span> Utils<span class="token punctuation">.</span><span class="token constant">CHART_COLORS</span><span class="token punctuation">.</span>blue<span class="token punctuation">,</span>
backgroundColor<span class="token operator">:</span> Utils<span class="token punctuation">.</span><span class="token function">transparentize</span><span class="token punctuation">(</span>Utils<span class="token punctuation">.</span><span class="token constant">CHART_COLORS</span><span class="token punctuation">.</span>blue<span class="token punctuation">,</span> <span class="token number">0.5</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
hoverBorderWidth<span class="token operator">:</span> <span class="token number">5</span><span class="token punctuation">,</span>
hoverBorderColor<span class="token operator">:</span> <span class="token string">'green'</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></div></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">4/2/2021, 8:04:39 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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