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plugin
</button><button class="code-editor-tab" data-v-66ca8197>
data
</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/legend/html.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 getOrCreateLegendList = (chart, id) => {
const legendContainer = document.getElementById(id);
let listContainer = legendContainer.querySelector('ul');
if (!listContainer) {
listContainer = document.createElement('ul');
listContainer.style.display = 'flex';
listContainer.style.flexDirection = 'row';
listContainer.style.margin = 0;
listContainer.style.padding = 0;
legendContainer.appendChild(listContainer);
}
return listContainer;
};
const htmlLegendPlugin = {
id: 'htmlLegend',
afterUpdate(chart, args, options) {
const ul = getOrCreateLegendList(chart, options.containerID);
// Remove old legend items
while (ul.firstChild) {
ul.firstChild.remove();
}
// Reuse the built-in legendItems generator
const items = chart.options.plugins.legend.labels.generateLabels(chart);
items.forEach(item => {
const li = document.createElement('li');
li.style.alignItems = 'center';
li.style.cursor = 'pointer';
li.style.display = 'flex';
li.style.flexDirection = 'row';
li.style.marginLeft = '10px';
li.onclick = () => {
const {type} = chart.config;
if (type === 'pie' || type === 'doughnut') {
// Pie and doughnut charts only have a single dataset and visibility is per item
chart.toggleDataVisibility(item.index);
} else {
chart.setDatasetVisibility(item.datasetIndex, !chart.isDatasetVisible(item.datasetIndex));
}
chart.update();
};
// Color box
const boxSpan = document.createElement('span');
boxSpan.style.background = item.fillStyle;
boxSpan.style.borderColor = item.strokeStyle;
boxSpan.style.borderWidth = item.lineWidth + 'px';
boxSpan.style.display = 'inline-block';
boxSpan.style.height = '20px';
boxSpan.style.marginRight = '10px';
boxSpan.style.width = '20px';
// Text
const textContainer = document.createElement('p');
textContainer.style.color = item.fontColor;
textContainer.style.margin = 0;
textContainer.style.padding = 0;
textContainer.style.textDecoration = item.hidden ? 'line-through' : '';
const text = document.createTextNode(item.text);
textContainer.appendChild(text);
li.appendChild(boxSpan);
li.appendChild(textContainer);
ul.appendChild(li);
});
}
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> <span class="token function-variable function">getOrCreateLegendList</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">chart<span class="token punctuation">,</span> id</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> legendContainer <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> listContainer <span class="token operator">=</span> legendContainer<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'ul'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>listContainer<span class="token punctuation">)</span> <span class="token punctuation">{</span>
listContainer <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">'ul'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
listContainer<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display <span class="token operator">=</span> <span class="token string">'flex'</span><span class="token punctuation">;</span>
listContainer<span class="token punctuation">.</span>style<span class="token punctuation">.</span>flexDirection <span class="token operator">=</span> <span class="token string">'row'</span><span class="token punctuation">;</span>
listContainer<span class="token punctuation">.</span>style<span class="token punctuation">.</span>margin <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
listContainer<span class="token punctuation">.</span>style<span class="token punctuation">.</span>padding <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
legendContainer<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>listContainer<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> listContainer<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> htmlLegendPlugin <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">'htmlLegend'</span><span class="token punctuation">,</span>
<span class="token function">afterUpdate</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 keyword">const</span> ul <span class="token operator">=</span> <span class="token function">getOrCreateLegendList</span><span class="token punctuation">(</span>chart<span class="token punctuation">,</span> options<span class="token punctuation">.</span>containerID<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Remove old legend items</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>ul<span class="token punctuation">.</span>firstChild<span class="token punctuation">)</span> <span class="token punctuation">{</span>
ul<span class="token punctuation">.</span>firstChild<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// Reuse the built-in legendItems generator</span>
<span class="token keyword">const</span> items <span class="token operator">=</span> chart<span class="token punctuation">.</span>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>legend<span class="token punctuation">.</span>labels<span class="token punctuation">.</span><span class="token function">generateLabels</span><span class="token punctuation">(</span>chart<span class="token punctuation">)</span><span class="token punctuation">;</span>
items<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">item</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> li <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">'li'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
li<span class="token punctuation">.</span>style<span class="token punctuation">.</span>alignItems <span class="token operator">=</span> <span class="token string">'center'</span><span class="token punctuation">;</span>
li<span class="token punctuation">.</span>style<span class="token punctuation">.</span>cursor <span class="token operator">=</span> <span class="token string">'pointer'</span><span class="token punctuation">;</span>
li<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display <span class="token operator">=</span> <span class="token string">'flex'</span><span class="token punctuation">;</span>
li<span class="token punctuation">.</span>style<span class="token punctuation">.</span>flexDirection <span class="token operator">=</span> <span class="token string">'row'</span><span class="token punctuation">;</span>
li<span class="token punctuation">.</span>style<span class="token punctuation">.</span>marginLeft <span class="token operator">=</span> <span class="token string">'10px'</span><span class="token punctuation">;</span>
li<span class="token punctuation">.</span><span class="token function-variable function">onclick</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> <span class="token punctuation">{</span>type<span class="token punctuation">}</span> <span class="token operator">=</span> chart<span class="token punctuation">.</span>config<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>type <span class="token operator">===</span> <span class="token string">'pie'</span> <span class="token operator">||</span> type <span class="token operator">===</span> <span class="token string">'doughnut'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// Pie and doughnut charts only have a single dataset and visibility is per item</span>
chart<span class="token punctuation">.</span><span class="token function">toggleDataVisibility</span><span class="token punctuation">(</span>item<span class="token punctuation">.</span>index<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">setDatasetVisibility</span><span class="token punctuation">(</span>item<span class="token punctuation">.</span>datasetIndex<span class="token punctuation">,</span> <span class="token operator">!</span>chart<span class="token punctuation">.</span><span class="token function">isDatasetVisible</span><span class="token punctuation">(</span>item<span class="token punctuation">.</span>datasetIndex<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><span class="token punctuation">;</span>
<span class="token comment">// Color box</span>
<span class="token keyword">const</span> boxSpan <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">'span'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
boxSpan<span class="token punctuation">.</span>style<span class="token punctuation">.</span>background <span class="token operator">=</span> item<span class="token punctuation">.</span>fillStyle<span class="token punctuation">;</span>
boxSpan<span class="token punctuation">.</span>style<span class="token punctuation">.</span>borderColor <span class="token operator">=</span> item<span class="token punctuation">.</span>strokeStyle<span class="token punctuation">;</span>
boxSpan<span class="token punctuation">.</span>style<span class="token punctuation">.</span>borderWidth <span class="token operator">=</span> item<span class="token punctuation">.</span>lineWidth <span class="token operator">+</span> <span class="token string">'px'</span><span class="token punctuation">;</span>
boxSpan<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display <span class="token operator">=</span> <span class="token string">'inline-block'</span><span class="token punctuation">;</span>
boxSpan<span class="token punctuation">.</span>style<span class="token punctuation">.</span>height <span class="token operator">=</span> <span class="token string">'20px'</span><span class="token punctuation">;</span>
boxSpan<span class="token punctuation">.</span>style<span class="token punctuation">.</span>marginRight <span class="token operator">=</span> <span class="token string">'10px'</span><span class="token punctuation">;</span>
boxSpan<span class="token punctuation">.</span>style<span class="token punctuation">.</span>width <span class="token operator">=</span> <span class="token string">'20px'</span><span class="token punctuation">;</span>
<span class="token comment">// Text</span>
<span class="token keyword">const</span> textContainer <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">'p'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
textContainer<span class="token punctuation">.</span>style<span class="token punctuation">.</span>color <span class="token operator">=</span> item<span class="token punctuation">.</span>fontColor<span class="token punctuation">;</span>
textContainer<span class="token punctuation">.</span>style<span class="token punctuation">.</span>margin <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
textContainer<span class="token punctuation">.</span>style<span class="token punctuation">.</span>padding <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
textContainer<span class="token punctuation">.</span>style<span class="token punctuation">.</span>textDecoration <span class="token operator">=</span> item<span class="token punctuation">.</span>hidden <span class="token operator">?</span> <span class="token string">'line-through'</span> <span class="token operator">:</span> <span class="token string">''</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> text <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createTextNode</span><span class="token punctuation">(</span>item<span class="token punctuation">.</span>text<span class="token punctuation">)</span><span class="token punctuation">;</span>
textContainer<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>text<span class="token punctuation">)</span><span class="token punctuation">;</span>
li<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>boxSpan<span class="token punctuation">)</span><span class="token punctuation">;</span>
li<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>textContainer<span class="token punctuation">)</span><span class="token punctuation">;</span>
ul<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>li<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><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 NUM_DATA = 7;
const NUM_CFG = {count: NUM_DATA, min: 0, max: 100};
const data = {
labels: Utils.months({count: NUM_DATA}),
datasets: [
{
label: 'Dataset: 1',
data: Utils.numbers(NUM_CFG),
borderColor: Utils.CHART_COLORS.red,
backgroundColor: Utils.transparentize(Utils.CHART_COLORS.red, 0.5),
fill: false,
},
{
label: 'Dataset: 1',
data: Utils.numbers(NUM_CFG),
borderColor: Utils.CHART_COLORS.blue,
backgroundColor: Utils.transparentize(Utils.CHART_COLORS.blue, 0.5),
fill: false,
},
],
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> <span class="token constant">NUM_DATA</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">NUM_CFG</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token literal-property property">count</span><span class="token operator">:</span> <span class="token constant">NUM_DATA</span><span class="token punctuation">,</span> <span class="token literal-property property">min</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token literal-property property">max</span><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> data <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token literal-property property">labels</span><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><span class="token literal-property property">count</span><span class="token operator">:</span> <span class="token constant">NUM_DATA</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token literal-property property">datasets</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
<span class="token literal-property property">label</span><span class="token operator">:</span> <span class="token string">'Dataset: 1'</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><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">NUM_CFG</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token literal-property property">borderColor</span><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>
<span class="token literal-property property">backgroundColor</span><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>
<span class="token literal-property property">fill</span><span class="token operator">:</span> <span class="token boolean">false</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">label</span><span class="token operator">:</span> <span class="token string">'Dataset: 1'</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><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">NUM_CFG</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token literal-property property">borderColor</span><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>
<span class="token literal-property property">backgroundColor</span><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>
<span class="token literal-property property">fill</span><span class="token operator">:</span> <span class="token boolean">false</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><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: 'line',
data: data,
options: {
plugins: {
htmlLegend: {
// ID of the container to put the legend in
containerID: 'legend-container',
},
legend: {
display: false,
}
}
},
plugins: [htmlLegendPlugin],
};</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>
<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">plugins</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">htmlLegend</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token comment">// ID of the container to put the legend in</span>
<span class="token literal-property property">containerID</span><span class="token operator">:</span> <span class="token string">'legend-container'</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token literal-property property">legend</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">display</span><span class="token operator">:</span> <span class="token boolean">false</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">plugins</span><span class="token operator">:</span> <span class="token punctuation">[</span>htmlLegendPlugin<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="docs"><a href="#docs" class="header-anchor">#</a> Docs</h2> <ul><li><a href="/docs/3.9.1/general/data-structures.html">Data structures (<code>labels</code>)</a></li> <li><a href="/docs/3.9.1/charts/line.html">Line</a></li> <li><a href="/docs/3.9.1/configuration/legend.html">Legend</a> <ul><li><code>display: false</code></li></ul></li> <li><a href="/docs/3.9.1/developers/plugins.html">Plugins</a></li></ul></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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