如何获取stackedBar ChartJs中的总值总和

问题描述

限时删除！！

我正在尝试获取stackedBar 的所有值的总和，并将其包含在工具提示中.

注意:我的数据集不是静态的，这是一个示例

var barChartData = {标签:[一月"，二月"，三月"，四月"，五月"，六月"，七月"]，数据集:[{标签:公司 1"，背景颜色:rgba(220,220,220,0.5)"，数据:[50、40、23、45、67、78、23]}, {标签:公司 2"，背景颜色:rgba(151,187,205,0.5)"，数据:[50、40、78、23、23、45、67]}, {标签:公司 3"，背景颜色:rgba(151,187,205,0.5)"，数据:[50、67、78、23、40、23、55]}]};window.onload = 函数(){var ctx = document.getElementById("canvas").getContext("2d");window.myBar = new Chart(ctx, {类型:'酒吧'，数据:条形图数据，选项: {标题:{显示:真，text:"Chart.js 条形图 - 堆叠"},工具提示:{模式:'标签'，回调:{标签:功能(工具提示项，数据){varcorporation = data.datasets[tooltipItem.datasetIndex].label;var valor = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];var total = eval(data.datasets[tooltipItem.datasetIndex].data.join("+"));return total+"--"+corporation +": $" + valor.toFixed(2).replace(/(d)(?=(d{3})+.)/g, '$1,');}}},响应式:真实，秤:{x轴:[{堆叠:真实，}],y轴:[{堆叠:真}]}}});};

现在 total 是每个数据集的总和，我需要每个stackedBar 的总和.

例子

标签 A:值 A

标签 B:值 B

标签 C:值 C

总计:值 A + 值 B + 值 C

有可能得到那个总值吗?

谢谢，伊达利亚.

解决方案

首先要知道，如果在tooltip的callback中返回一个数组而不是单个字符串，它会显示所有数组中的字符串就好像它是不同的数据集一样(有关详细信息，请参阅

I'm trying to get the sum of all values of a stackedBar and include this total in tooltip.

var barChartData = {
        labels: ["January", "February", "March", "April", "May", "June", "July"],
        datasets: [{
            label: 'Corporation 1',
            backgroundColor: "rgba(220,220,220,0.5)",
            data: [50, 40, 23, 45, 67, 78, 23]
        }, {
            label: 'Corporation 2',
            backgroundColor: "rgba(151,187,205,0.5)",
            data: [50, 40, 78, 23, 23, 45, 67]
        }, {
            label: 'Corporation 3',
            backgroundColor: "rgba(151,187,205,0.5)",
            data: [50, 67, 78, 23, 40, 23, 55]
        }]

    };

    window.onload = function() {
        var ctx = document.getElementById("canvas").getContext("2d");
        window.myBar = new Chart(ctx, {
            type: 'bar',
            data: barChartData,
            options: {
                title:{
                    display:true,
                    text:"Chart.js Bar Chart - Stacked"
                },
                tooltips: {
                    mode: 'label',
                    callbacks: {
                       label: function(tooltipItem, data) {
                       var corporation = data.datasets[tooltipItem.datasetIndex].label;
                       var valor = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
                       var total = eval(data.datasets[tooltipItem.datasetIndex].data.join("+"));
                       return total+"--"+ corporation +": $" + valor.toFixed(2).replace(/(d)(?=(d{3})+.)/g, '$1,');
                  }
                    }
                },
                responsive: true,
                scales: {
                    xAxes: [{
                        stacked: true,
                    }],
                    yAxes: [{
                        stacked: true
                    }]
                }
            }
        });
    };

Now total is the sum per dataset and I need the sum per stackedBar.

Example

Label A: value A

Label B: value B

Label C: value C

TOTAL: value A + value B + value C

It is possible to get that total value?

Thanks, Idalia.

解决方案

First you should know that if you return an array instead of a single string in the callback of the tooltip, it will display all the strings in your array as if it were different datasets (see this answer for more details).

So I edited a little bit your callback to the following:

callbacks: {
    label: function(tooltipItem, data) {
        var corporation = data.datasets[tooltipItem.datasetIndex].label;
        var valor = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];

        // Loop through all datasets to get the actual total of the index
        var total = 0;
        for (var i = 0; i < data.datasets.length; i++)
            total += data.datasets[i].data[tooltipItem.index];

        // If it is not the last dataset, you display it as you usually do
        if (tooltipItem.datasetIndex != data.datasets.length - 1) {
            return corporation + " : $" + valor.toFixed(2).replace(/(d)(?=(d{3})+.)/g, '$1,');
        } else { // .. else, you display the dataset and the total, using an array
            return [corporation + " : $" + valor.toFixed(2).replace(/(d)(?=(d{3})+.)/g, '$1,'), "Total : $" + total];
        }
    }
}

You can see the full code in this jsFiddle, and here is its result :

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