如何在Chart.js中以编程方式触发悬停 [英] How to trigger hover programmatically in chartjs
问题描述
我想以编程方式在ChartJs中设置悬停效果,我希望同时看到 hoverBorderWidth
和 hoverBorderColor
这两种效果。我知道如何激活一些工具提示,但无法应用悬停效果。例如,如果我有图表和一些外部链接,则可以触发 mouseover
事件来链接。我想在ChartJs中产生悬停效果,我该怎么做?
I want to set the hover effect in ChartJs programmatically i wish to see both effects hoverBorderWidth
, and hoverBorderColor
. I know how to activate some tooltips, but I can't apply hover effects. For example, if I have chart and some links outside, I can trigger mouseover
events to links. I want to have the hover effect in ChartJs, how can i do this?
感谢您的回答。
推荐答案
Chart.js侦听 mousemove
事件,并检查数据点是否在x / y坐标上。如果是这样,它将触发该点的悬停行为。
Chart.js listens for mousemove
events and checks if a datapoint is at the x/y coordinates. If so, it triggers the 'hover' behaviour for that point.
从 Chart.js工具提示测试代码,我编写了以下代码段,以演示如何访问正确的属性并触发事件。
Borrowing from the Chart.js tooltips test code, I wrote the snippet below to demonstrate accessing the correct properties and triggering an event.
let c = new Chart($('#chart'), {
type: 'doughnut',
data: {
labels: ['a', 'b', 'c', 'd'],
datasets: [{
data: [1, 2, 4, 8],
backgroundColor: ['red', 'blue', 'green', 'orange']
}]
},
options: {
maintainAspectRatio: false
}
});
$('#a').on('click', function() { t(0); });
$('#b').on('click', function() { t(1); });
$('#c').on('click', function() { t(2); });
$('#d').on('click', function() { t(3); });
function t(idx) {
var meta = c.getDatasetMeta(0),
rect = c.canvas.getBoundingClientRect(),
point = meta.data[idx].getCenterPoint(),
evt = new MouseEvent('mousemove', {
clientX: rect.left + point.x,
clientY: rect.top + point.y
}),
node = c.canvas;
node.dispatchEvent(evt);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
<button id="a">Hover a</button>
<button id="b">Hover b</button>
<button id="c">Hover c</button>
<button id="d">Hover d</button>
<canvas id="chart"></canvas>
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