如何为chart.js线图动态创建数据集？ [英] How to create datasets dynamically for chart.js Line chart?

问题描述

我想在chart.js库中动态创建包含多个数据集的折线图。

I want to create a Line chart with multiple datasets dynamically in the chart.js library.

我能够动态分配数据。但我想动态创建数据集本身。我看到下面的链接：

I am able to assign the data dynamically. But I want to create the datasets itself dynamically. I saw the link below:

如何动态地从html表中为chart.js添加元素

并尝试过这个：

var datasetValue = [];
for (var j = 0; j < count; j++) {
datasetValue[j] = [
{
fillColor: 'rgba(220,220,220,0.5)',
strokeColor :'rgba(220,220,220,1)' ,
title :'2013',
data : [Math.round(Math.random() * 100),Math.round(Math.random() * 100)-10]
}]
}

var mydata = {
datasets : datasetValue
}

这里的计数值是3，我想在图表中显示3行，计数值会有所不同。即使图表线颜色和标题相同，我想先显示该行，并在解决后更改其余部分。

Here the count value is 3 and I want to display the 3 lines in the chart and the count value will vary. Even though the chart line color and title will be the same, I want to display the line first and will change the rest once this is solved.

我试图访问数据如下：

alert("Datasets:"+mydata.datasets[0].data);

它应显示第一个数据集的数据，但显示 undefined 。

It should show the data of the first dataset but it's showing undefined.

但在以下情况中：

var mydata1 = {
labels : ["January","February","March","April","May","June","July"],
datasets : [
    {
        fillColor : "rgba(220,220,220,0.5)",
        strokeColor : "rgba(220,220,220,1)",
        data : [95,53,99,73,27,82,40],
        title : "2014"
    },
    {
        fillColor : "rgba(151,187,205,0.5)",
        strokeColor : "rgba(151,187,205,1)",
        data : [35,43,59,31,50,66,55],
        title : "2013"
    }
 ]
}

alert("Datasets:"+mydata1.datasets[0].data);

我能够获得第一个数据集的数据。有谁能请给我解决方案？

I am able to get the data of first dataset. Could anyone please give me the solution?

推荐答案

我认为你正在寻找类似以下解决方案的东西。
http://jsfiddle.net/5m63232a/

I think you are looking for something like the following solution. http://jsfiddle.net/5m63232a/

var datasetValue = [];
var count = 10;
for (var j=0; j<count; j++) {
    datasetValue[j] = {
        fillColor: 'rgba(220,220,220,0.5)',
        strokeColor :'rgba(220,220,220,1)',
        title :'2013',
        data : [Math.round(Math.random() * 100),Math.round(Math.random() * 100)-10]
    }
}
var mydata = {
    datasets : datasetValue
}
alert("Datasets: "+mydata.datasets[0].data);

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