如何在yAxis Chartjs的两行之间添加背景色 [英] How to add background color between two lines in yAxis Chartjs

问题描述

我如何在chartjs
中的Y轴的两行之间添加背景颜色，如果您选中该图，我需要能够执行以下操作：
在两行之间设置颜色，第一个是橙色，然后是蓝色或其他颜色，
i检查了官方文档，但我什么都没找到。

How i can add background color between two lines in Y-Axis in chartjs if you checked the figure i need to be able to do something like this set a color between two lines first one is orange and then blue or whatever, i checked the official docs but i didn't find anything.

这也是我的chartjs配置

also here is my chartjs configurations

 this.options = {
        responsive: true,
        maintainAspectRatio: false,
        scales: {
          xAxes: [
            {
              gridLines: {
                display: true,
                color: chartjs.axisLineColor,
              },
              ticks: {
                fontColor: chartjs.textColor,
              },
            },
          ],
          yAxes: [
            {
              gridLines: {
                display: true,
                color: chartjs.axisLineColor,
              },
              ticks: {
                fontColor: chartjs.textColor,
              },
            },
          ],
        },
        legend: {
          labels: {
            fontColor: chartjs.textColor,
          },
        },
      };

推荐答案

您必须注册自己的插件在图表线条绘制之前填充chartArea：

You have to register your own plugin to fill chartArea before chart line drawing:

Chart.pluginService.register({
  beforeDraw: function (chart, easing) {
    if (chart.config.options.fillColor) {
      var ctx = chart.chart.ctx;
      var chartArea = chart.chartArea;
      ctx.save();
      ctx.fillStyle = chart.config.options.fillColor;
      ctx.fillRect(chartArea.left, chartArea.top, chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
      ctx.restore();
    }
  }
});

var chartData = {
  labels: ['a', 'b', 'c', 'd'],
  datasets: [{
    label: 'value',
    backgroundColor: 'rgba(255, 0, 255, 0.8)',
    borderColor: 'blue',
    data: [30, 50, 25, 10]
  }]
};

var ctx = document.getElementById("myChart").getContext("2d");
var myBar = new Chart(ctx, {
  type: 'line',
  data: chartData,
  options: {
  	scales: {
    	yAxes: [{ ticks: { max: 60 } }]
    },
  	legend: { display: false },
		fillColor: 'rgba(255, 128, 0, 0.8)',
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.min.js"></script>

<canvas id="myChart" height="300" width="500"></canvas>

这篇关于如何在yAxis Chartjs的两行之间添加背景色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！