javascript - chart.js 将一个条设置为不同的颜色？

Question

所以我有这段代码，它很乐意以我需要的格式显示图表:

<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>

我希望该图表中的其中一个条显示为与上面代码中设置的颜色不同的颜色。

Answer 1

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像这样更新图表:

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 .