javascript - 多个图表不工作 Chart.js

Question

我在 StackOverflow 上寻找了很长时间，寻找解决我的问题的方法。我已经知道它与 window.onload 有关，它在我的脚本中被打开了两次，但我无法修复它。我找了好几天了你们能帮帮我吗？

这是我的 chartBarSample.php 代码:

<script>
    var optionsBar = {
        responsive: true
    };

    var dataBar = {
        labels: ["Outubro", "Novembro", "Dezembro"],
        datasets: [
            {
                label: "CPF's Enviados",
                fillColor: "#00335A",
                strokeColor: "#00243F",
                highlightFill: "#00243F",
                highlightStroke: "#00192B",
                data: [6920, 7226, 7969]
            },
            {
                label: "Propostas Finalizadas",
                fillColor: "#007CDA",
                strokeColor: "#0066B4",
                highlightFill: "#0066B4",
                highlightStroke: "#005290",
                data: [6325, 6825, 7586]
            },
            {
                label: "Propostas Aprovadas",
                fillColor: "#2B8B4A",
                strokeColor: "#196431",
                highlightFill: "#196431",
                highlightStroke: "#114622",
                data: [5463, 6606, 6501]
            }
        ]
    };

    var optionsLine = {
        responsive: true
    };

    var dataLine = {
        labels: ["Janeiro", "Fevereiro", "Março", "Abril", "Maio", "Junho", "Julho", "Agosto", "Setembro", "Outubro", "Novembro", "Dezembro"],
        datasets: [
            {
                label: "Dados primários",
                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: [randomnb(), randomnb(), randomnb(), randomnb(), randomnb(), randomnb(), randomnb(), randomnb(), randomnb(), randomnb(), randomnb(), randomnb()]
            },
            {
                label: "Dados secundários",
                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: [28, 48, 40, 19, 86, 27, 90, 200, 87, 20, 50, 20]
            }
        ]
    };     

    function start(){
        var ctx = document.getElementById("graficoBarra").getContext("2d");
        var BarChart = new Chart(ctx).Bar(dataBar, optionsBar);

        var ctx2 = document.getElementById("graficoLinha").getContext("2d");
        var LineChart = new Chart(ctx2).Line(dataLine, optionsLine);
    }

    window.onload = start;
</script>

Answer 1

您的图表定义不正确，请尝试以下操作:

function start(){
    var ctx = document.getElementById("graficoBarra").getContext("2d");
    var BarChart = new Chart(ctx, {
          type: 'bar',
          data: dataBar,
          options: optionsBar          
    });

    var ctx2 = document.getElementById("graficoLinha").getContext("2d");
    var LineChart = new Chart(ctx2, {
          type: 'line',
          data: dataLine,
          options: optionsLine          
    });
}

Codepen 中的完整代码:2 Chart.js Charts 结果: