获取yLabel值onclick图表js [英] get yLabel value onclick chart js

问题描述

当我单击栏时，我想要y标签的值.

I want to have the y label value, when I click on the bar.

就像上面的示例一样，当我单击2月的蓝色条时，我想要的标签值为40

Like the above example, when I click on feb blue bar I want to have label value, which is 40

我在stackOverFlow和其他站点上查找了示例，但它们仅具有显示图例的标签示例.

I looked for examples on stackOverFlow and other sites but they only have example of label for the legend show up.

我尝试过的一些代码

onClick: function(evt, element) {
      var activePoints = bar_chart.getElementAtEvent(evt);
      console.log(activePoints[0]._model.datasetLabel);
}

推荐答案

单击此演示时，此演示会在条形图中提供值.我不是chart.js专家，所以可能会有更好的解决方案.

This demo gives the value in the bar chart when you click on it. I'm not a chart.js expert so there may be better solutions.

https://codepen.io/newschapmj1/pen/PerOzM

/* from https://github.com/chartjs/Chart.js/issues/2292 */
document.getElementById("myChart").onclick = function (evt) {
        var activePoints = myChart.getElementsAtEventForMode(evt, 'point', myChart.options);
        var firstPoint = activePoints[0];
        var label = myChart.data.labels[firstPoint._index];
        var value = myChart.data.datasets[firstPoint._datasetIndex].data[firstPoint._index];
        alert(label + ": " + value);
    };

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