Question

所以我有这个代码，它很高兴地以我需要的格式显示图形：

<script>var ChartTitleOps = {

showTooltips: true,
tooltipFillColor: "#e64c65",
tooltipFontFamily: "'Bree Serif', sans-serif",
tooltipFontColor: "#fff",
tooltipTemplate: "<%if (label){%><%=label%> <%}%>(<%= value %> votes)",
barValueSpacing : 2,
scaleLineWidth: 10,

    scaleFontFamily: "'Bree Serif', sans-serif",responsive: false,animation: false,maintainAspectRatio: false,scaleIntegersOnly: true,scaleShowGridLines : false,scaleBeginAtZero : true,scaleFontSize: 17,scaleFontColor: "#FFFFFF",scaleOverride:true,scaleSteps:<?php echo $highestVoteCount ?>,scaleStepWidth:1,scaleStartValue:0,scaleGridLineColor : "#1f253d"}; var ChartTitleData = {labels : [<?php styleFinishedVoteAmounts($votesPlaced); ?>],datasets : [{
                fillColor   : "rgba(52,104,175,0.7)",
                strokeColor : "rgba(52,104,175,1)",
                data        : [<?php styleFinishedVoteCount($VoteCounts); ?>]
            }]};var wpChartChartTitleBar = new Chart(document.getElementById("ChartTitle").getContext("2d")).Bar(ChartTitleData,ChartTitleOps);
</script>

我希望该图表中的一个条形显示为与上面代码中设置的颜色不同的颜色。

Answer 1

由于rtome的方法在Chart.js的较新版本中似乎不起作用，因此以下是当前版本（本文中为2.9.3）使用不同条形颜色的有效示例。

/gen

/gen

var ctx = document.getElementById("myChart").getContext("2d");
var chart = new Chart(ctx, {
  // The type of chart we want to create
  type: "horizontalBar",

  // The data for our dataset
  data: {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [{
      label: "My First dataset",
      backgroundColor: [
        "rgb(255, 99, 132)",
        "rgb(255, 159, 64)",
        "rgb(255, 205, 86)",
        "rgb(75, 192, 192)",
        "rgb(54, 162, 235)",
        "rgb(153, 102, 255)",
        "rgb(201, 203, 207)"
      ],
      borderColor: "rgb(255, 99, 132)",
      data: [3, 10, 5, 2, 20, 30, 45]
    }]
  },

  // Configuration options go here
  options: {}
});

Answer 2

您可以在创建图表后更改条形元素的颜色。

在new Chart()语句之后，您可以访问和修改图表元素属性并更新图表，如下所示：

var wpChartChartTitleBar = new Chart(document.getElementById("myChart").getContext("2d")).Bar(ChartTitleData, ChartTitleOps);

// Change 2nd bar to red (display).
wpChartChartTitleBar.datasets[0].bars[1].fillColor = "rgba(229,12,12,0.7)";
wpChartChartTitleBar.datasets[0].bars[1].strokeColor = "rgba(229,12,12,1)";

// Change 2nd bar to red (highlight setting on mouse over)
wpChartChartTitleBar.datasets[0].bars[1].highlightFill = "rgba(0,229,0,0.7)";
wpChartChartTitleBar.datasets[0].bars[1].highlightStroke = "rgba(0,229,0,1)";

wpChartChartTitleBar.update();

查看fiddle of it here。

chart.js将一个条设置为不同的颜色？

2 个答案: