Chart.js-多个折线图-[2]

Question

有人问了这个问题，似乎在这里回答了。 尽管它没有帮助我，或者似乎根本无法工作。

（ 使用Chart.js ）

我使用完全相同的代码链接的帖子，看起来像这样;

<script src="includes/Chart.js"></script>



<div class="labeled-chart-container">
    <div class="canvas-holder">
        <canvas id="canvas1" width="250" height="250">
        </canvas>
    </div>
    <div class="canvas-holder">
        <canvas id="canvas2" width="250" height="250">
        </canvas>
    </div>
</div>





<script type="text/javascript">

    var lineChartData = {
        labels : ["January","February","March","April","May","June","July","August","September","October","November","December"],
        datasets : [
            {
                label: "Target",
                fillColor : "rgba(220,220,220,0.2)",
                strokeColor : "rgba(220,220,220,1)",
                pointColor : "rgba(220,220,220,1)",
                pointStrokeColor : "#fff",
                pointHighlightFill : "#fff",
                pointHighlightStroke : "rgba(220,220,220,1)",
                data : [160000,175000,185000,180000,185000,185000,185000,195000,200000,0,0]
            },
            {
                label: "Sales",
                fillColor : "rgba(151,187,205,0.2)",
                strokeColor : "rgba(151,187,205,1)",
                pointColor : "rgba(151,187,205,1)",
                pointStrokeColor : "#fff",
                pointHighlightFill : "#fff",
                pointHighlightStroke : "rgba(151,187,205,1)",
                data : [<?php echo $stockJanuary ?>,<?php echo $stockFebruary ?>,<?php echo $stockMarch ?>,<?php echo $stockApril ?>,<?php echo $stockMay ?>,<?php echo $stockJune ?>,<?php echo $stockJuly ?>,<?php echo $stockAugust ?>,<?php echo $stockSeptember ?>,<?php echo $stockOctober ?>,<?php echo $stockNovember ?>,<?php echo $stockDecember ?>]
            }
        ]

    }
            window.onload = function(){
</script>


<script type="text/javascript">

    var lineChartData = {
        labels : ["January","February","March","April","May","June","July","August","September","October","November","December"],
        datasets : [
            {
                label: "Target",
                fillColor : "rgba(220,220,220,0.2)",
                strokeColor : "rgba(220,220,220,1)",
                pointColor : "rgba(220,220,220,1)",
                pointStrokeColor : "#fff",
                pointHighlightFill : "#fff",
                pointHighlightStroke : "rgba(220,220,220,1)",
                data : [19000,21000,23000,25000,27000,29000,31000,32000,33000,0,0]
            },
            {
                label: "Sales",
                fillColor : "rgba(151,187,205,0.2)",
                strokeColor : "rgba(151,187,205,1)",
                pointColor : "rgba(151,187,205,1)",
                pointStrokeColor : "#fff",
                pointHighlightFill : "#fff",
                pointHighlightStroke : "rgba(151,187,205,1)",
                data : [<?php echo $northJanuary ?>,<?php echo $northFebruary ?>,<?php echo $northMarch ?>,<?php echo $northApril ?>,<?php echo $northMay ?>,<?php echo $northJune ?>,<?php echo $northJuly ?>,<?php echo $northAugust ?>,<?php echo $northSeptember ?>,<?php echo $northOctober ?>,<?php echo $northNovember ?>,<?php echo $northDecember ?>]
            }
        ]

    }
</script>

<script>
window.onload = function(){
    var ctx = document.getElementById("canvas2").getContext("2d");
    window.myLine = new Chart(ctx).Line(lineChartData, {
    responsive: true
    });


   var ctx2 = document.getElementById("canvas1").getContext("2d");
    window.myLine = new Chart(ctx2).Line(lineChartData2, {
        responsive: true
    });

}
</script>

我不知道答案/问题是否过时，或者我在这里做错了什么？

Answer 1

lineChartData变量似乎重复，我认为您需要将lineChartData2命名为第二个或任何您想要的名称。

检查以下语句：

window.myLine = new Chart(ctx).Line(lineChartData ...
window.myLine = new Chart(ctx2).Line(lineChartData2 ...

每个脚本中的vars声明是：

var lineChartData = {...}
var lineChartData = {...}

两次！ 因此，第二个声明将覆盖最早的声明。 您需要两个数据集，并且它们必须与chart.js初始化代码的名称匹配。