同一页面中的多个chartjs

Question

嗨，我试图使用chartjs可以在这个链接中找到www.chartjs.org

我试图用样本代码在同一页上画两个图表

我用两个不同的ID创建了两个不同的div

就像这样

<div id="chart1"></div>
<div id="chart2"></div>

那么在包括这一行之后：

我以这种方式创建了第一个图表：

 window.onload = function(){
    var ctx1 = document.getElementById("chart1").getContext("2d");
    window.myLine = new Chart(ctx1).Line(lineChartData, {
        responsive: true
    });
}

第二张图表是这样的：

   window.onload = function(){
        var ctx2 = document.getElementById("chart2").getContext("2d");
        window.myPie = new Chart(ctx2).Pie(pieData);
    };

两个图表使用的数据与样本相同，所以没有什么变化，但如果我只画一个图表本身，它的工作原理很好，如果我把两个图表在同一时间，我只得到饼图

你能告诉我问题在哪里吗？我想这是某种冲突，但我找不到

Answer 1

首先，你只需要一个window.onload事件。没有理由有两个独立的例子。

第二，饼图和折线图的数据集实际上非常不同。

饼图示例数据：

        self.pieData=  [
        {
            value: 65,
            color:"#F7464A",
            highlight: "#FF5A5E",
            label: "New Scenarios"
        },
        {
            value: 297,
            color: "#46BFBD",
            highlight: "#5AD3D1",
            label: "Responses Submitted"
        },
        {
            value: 225,
            color: "#64a789",
            highlight: "#5AD3D1",
            label: "Responses Graded"
        }

    ]

折线图样本数据：

self.lineData= {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [
        {
            label: "New Tests",
            fillColor: "rgba(220,220,220,0.2)",
            strokeColor: "#64a789",
            pointColor: "#64a789",
            pointStrokeColor: "#fff",
            pointHighlightFill: "#fff",
            pointHighlightStroke: "rgba(220,220,220,1)",
            data: [65, 59, 80, 81, 56, 55, 40]
        },
        {
            label: "Responses",
            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: [128, 148, 140, 119, 186, 127, 190]
        },
        {
            label: "Responses Graded",
            fillColor: "rgba(151,187,205,0.2)",
            strokeColor: "#41e498",
            pointColor: "#41e498",
            pointStrokeColor: "#fff",
            pointHighlightFill: "#fff",
            pointHighlightStroke: "rgba(151,187,205,1)",
            data: [108, 116, 120, 112, 136, 121, 111]
        }
    ]
};

折线图可能没有初始化，因为您给它输入了错误类型的数据。

Answer 2

我没有在不同类型的图表上工作，但我在一个例子上工作，并使用此代码在页面中创建了两个条形图：

<div style="width: 50%">
    <canvas id="canvas" height="450" width="600"></canvas>
</div>

<div style="width: 50%">
    <canvas id="canvas2" height="450" width="600"></canvas>
</div>

在脚本部分，我喜欢这样：

javascript prettyprint-override">var randomScalingFactor = function(){ return Math.round(Math.random()*100)};

var barChartData = {
    labels : ["January","February","March","April","May","June","July"],
    datasets : [
        {
            fillColor : "rgba(220,220,220,0.5)",
            strokeColor : "rgba(220,220,220,0.8)",
            highlightFill: "rgba(220,220,220,0.75)",
            highlightStroke: "rgba(220,220,220,1)",
            data : [randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor()]
        },
        {
            fillColor : "rgba(151,187,205,0.5)",
            strokeColor : "rgba(151,187,205,0.8)",
            highlightFill : "rgba(151,187,205,0.75)",
            highlightStroke : "rgba(151,187,205,1)",
            data : [randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor()]
        }
    ]

}
    var barChartData2 = {
    labels : ["January","February","March","April","May","June","July"],
    datasets : [
        {
            fillColor : "rgba(220,220,220,0.5)",
            strokeColor : "rgba(220,220,220,0.8)",
            highlightFill: "rgba(220,220,220,0.75)",
            highlightStroke: "rgba(220,220,220,1)",
            data : [randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor()]
        },
        {
            fillColor : "rgba(151,187,205,0.5)",
            strokeColor : "rgba(151,187,205,0.8)",
            highlightFill : "rgba(151,187,205,0.75)",
            highlightStroke : "rgba(151,187,205,1)",
            data : [randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor()]
        }
    ]

}
window.onload = function(){
    var ctx = document.getElementById("canvas").getContext("2d");
    window.myBar = new Chart(ctx).Bar(barChartData, {
        responsive : true
    });
    var ctx2 = document.getElementById("canvas2").getContext("2d");
    window.myBar = new Chart(ctx2).Bar(barChartData2, {
        responsive : true
    });
}

Answer 3

仅使用一个窗口。onload

window.onload = function () {
        window.myRadar = new Chart(document.getElementById("canvas1").getContext("2d")).Radar(radarChartData, {
            responsive: true
        });
        var G2 = document.getElementById("canvas2").getContext("2d");
        window.myBar = new Chart(G2).Bar(barChartData, {
            responsive: true
        });
    }