如何自定义Chart.js 2.0甜甜圈图的工具提示? [英] How to customize the tooltip of a Chart.js 2.0 Doughnut Chart?

问题描述

我正在尝试使用Chart.js2中的甜甜圈图显示一些数据.

I'm trying to show some data using a doughnut chart from Chart.js2.

我当前的图表如下:

My current chart looks like this:

我想要的输出必须显示另一个属性，即百分比，如下所示:

My desired output must show another attribute, which is the percentage, and looks like this:

我已经阅读了文档，但是由于它非常笼统并且是JavaScript的新手，所以我无法解决.

I've read the documentation, but I can't cope with this because it's very general and I'm new to JavaScript.

我的第一个图表代码如下:

My code for the first chart is the following:

const renderCashCurrencyPie = (cashAnalysisBalances) => {
  if (cashAnalysisBalances) {
    const currenciesName = cashAnalysisBalances
    .map(curName => curName.currency);

    const availableCash = cashAnalysisBalances
    .map(avCash => avCash.availableCash);

    let currenciesCounter = 0;
    for (let i = 0; i < currenciesName.length; i += 1) {
      if (currenciesName[i] !== currenciesName[i + 1]) {
        currenciesCounter += 1;
      }
    }

    const currenciesData = {
      labels: currenciesName,
      datasets: [{
        data: availableCash,
        backgroundColor: [
          '#129CFF',
          '#0C6DB3',
          '#FF6384',
          '#00FFFF'
        ],
        hoverBackgroundColor: [
          '#FF6384',
          '#36A2EB',
          '#FFCE56',
          '#00FFFF'
        ]
      }]
    };

推荐答案

您可以使用图表选项工具提示配置部分自定义工具提示，如下所述:

You can customize the tooltips using the chart options tooltip configuration section, as explained here: http://www.chartjs.org/docs/latest/configuration/tooltip.html#tooltip-configuration

如下面的示例代码所示，您可以更改颜色，大小和样式等内容.查看上面链接的文档以获取可配置选项的完整列表.

As shown in the example code below, you can change things like color, sizing and styles. Check out the documentation linked above for a full list of configurable options.

如果要将百分比添加到工具提示显示中，则可以使用

If you want to add the percentage to the tooltip display, you can use tooltip callbacks. The documentation has a list of all the possible customizable callback fields.

在下面的示例中，我将"title"设置为显示标签名称，将"label"设置为显示值，并将百分比添加到"afterLabel".

In the below example, I set the "title" to show the label name, "label" to show the value, and added the percentage to "afterLabel".

var myChart = new Chart(ctx, {
  type: 'doughnut',
  data: data,
  options: {
    tooltips: {
      callbacks: {
        title: function(tooltipItem, data) {
          return data['labels'][tooltipItem[0]['index']];
        },
        label: function(tooltipItem, data) {
          return data['datasets'][0]['data'][tooltipItem['index']];
        },
        afterLabel: function(tooltipItem, data) {
          var dataset = data['datasets'][0];
          var percent = Math.round((dataset['data'][tooltipItem['index']] / dataset["_meta"][0]['total']) * 100)
          return '(' + percent + '%)';
        }
      },
      backgroundColor: '#FFF',
      titleFontSize: 16,
      titleFontColor: '#0066ff',
      bodyFontColor: '#000',
      bodyFontSize: 14,
      displayColors: false
    }
  }
});

正在工作的JSFiddle: https://jsfiddle.net/m7s43hrs/

Working JSFiddle: https://jsfiddle.net/m7s43hrs/

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