Google Charts在第一张图表后停止绘制

Question

我想做的事

在一个页面上显示多个条形图

我已经做了什么

Barcharts主要是Linecharts.作为Linecharts,我可以在同一页面上显示两个图表而没有问题.我使用了两个单独的drawChart()函数.然后我将图表转换为Barcharts(材料设计).现在它只显示一个图表.我已经搜索了一个答案并发现了这个:如何在一个页面上添加两个Google图表？ 我遵循这个,它仍然无法正常工作.

我的守则

<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
    google.load("visualization", "1.1", {
        packages: ["Bar"]
    });
    google.setOnLoadCallback(drawChart);

    function drawChart() {

        var data1 = new google.visualization.DataTable();
        data1.addColumn("string", "Key1");
        data1.addColumn("number", "Value1");

        data1.addRows([
            ['2015.01', 65.5],
            ['2015.02', 52.6],
            ['2015.03', 45.5],
            ['2015.04', 40.7],
            ['2015.05', 68.7],
            ['2015.06', 56.4],
            ['2015.07', 38.4],
            ['2015.08', 45.2],
            ['2015.09', 45.2],
            ['2015.10', 4.8]
        ]);

        var data2 = new google.visualization.DataTable();
        data2.addColumn("string", "Key2");
        data2.addColumn("number", "Value2");

        data2.addRows([
            ['2015.01', 300.08],
            ['2015.02', 455.08],
            ['2015.03', 454.62],
            ['2015.04', 362.93],
            ['2015.05', 527.12],
            ['2015.06', 588.28],
            ['2015.07', 409.93],
            ['2015.08', 432.08],
            ['2015.09', 462.33],
            ['2015.10', 32.38]
        ]);

        var options = {};

        var chart1 = new google.charts.Bar(document.getElementById("chart_div1"));
        chart1.draw(data1, options);

        var chart2 = new google.charts.Bar(document.getElementById("chart_div2"));
        chart2.draw(data2, options);

    }


</script>

<div id="chart_div1"></div>
<div id="chart_div2"></div>

在这里观看最好:https://jsfiddle.net/yrzf3v97/

问题

它只显示一个图表.大部分时间是第一个,但有时是第二个.通过使用alert() - 函数,它可以确认代码运行直到结束.

Answer 1

看来这种行为与draw功能有关.特别是,由于在第二次调用函数后未生成图表SVG,因此不会呈现第二个图表draw.

根据文件:

draw()方法是异步的:也就是说,它会立即返回,但它返回的实例可能不会立即可用.

要在页面上呈现多个图表,您可以考虑以下方法:在渲染上一个图表后渲染下一个图表,例如:

var chart1 = new google.charts.Bar(document.getElementById("chart_div1"));
google.visualization.events.addOneTimeListener(chart1, 'ready', function(){
     //render chart2 once chart1 is rendered
     var chart2 = new google.charts.Bar(document.getElementById("chart_div2"));
     chart2.draw(data2, options);     
});
chart1.draw(data1, options);

完整的例子

google.load("visualization", "1.1", { packages: ["Bar"] });
google.setOnLoadCallback(drawChart);

function drawChart() {

    var data1 = new google.visualization.DataTable();
    data1.addColumn("string", "Key1");
    data1.addColumn("number", "Value1");

    data1.addRows([['2015.01', 65.5],
        ['2015.02', 52.6],
        ['2015.03', 45.5],
        ['2015.04', 40.7],
        ['2015.05', 68.7],
        ['2015.06', 56.4],
        ['2015.07', 38.4],
        ['2015.08', 45.2],
        ['2015.09', 45.2],
        ['2015.10', 4.8]]);

    var data2 = new google.visualization.DataTable();
    data2.addColumn("string", "Key2");
    data2.addColumn("number", "Value2");

    data2.addRows([['2015.01', 300.08],
        ['2015.02', 455.08],
        ['2015.03', 454.62],
        ['2015.04', 362.93],
        ['2015.05', 527.12],
        ['2015.06', 588.28],
        ['2015.07', 409.93],
        ['2015.08', 432.08],
        ['2015.09', 462.33],
        ['2015.10', 32.38]]);

    var options = {};
    drawCharts([{id: 'chart_div1', data: data1, options: options},{id: 'chart_div2', data: data2, options: options}]);
}



function drawCharts(chartsOptions,index)
{
    var curIndex = index || 0;
    var chartOptions = chartsOptions[curIndex];
    var chart = new google.charts.Bar(document.getElementById(chartOptions.id));
    google.visualization.events.addOneTimeListener(chart, 'ready', function(){
       if(curIndex < chartsOptions.length - 1)
          drawCharts(chartsOptions,curIndex+1);
    });
    chart.draw(chartOptions.data, chartOptions.options);
}

<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<div id="chart_div1"></div>
<div id="chart_div2"></div>