根据下拉列表更新图表使用

时间:2015-05-11 08:39:09

标签: javascript jquery html charts c3

我正在尝试根据选择特定的日期条件来呈现图表。当我从下拉列表中选择一个选项(例如每月)时,我希望图表能够呈现不同的数据集。

目前,下面的脚本没有执行上述预期输出(当我从选择列表中选择每日/每月时,它没有显示数据)。我在下面的代码中遗漏了什么?请指教。

这是我的代码:

var dataDaily = [
    ['CVR', 'TALK'],
    [90, 353]
];

var dataWeekly = [
    ['CVR', 'TALK'],
    [225, 893]
];

var dataMonthly = [
    ['CVR', 'TALK'],
    [1602, 4934]  
];

$(function () {
    
    // Initial chart
    var chart = c3.generate({
        data: {
            rows: dataDaily,
            type: 'pie'
        }
    });
    
    // Redraw chart depending on which option is selected
    $("#DataType").change(function (evt) {
        var timeSelection = $("#DataType").val();
        var chart = c3.generate({
            data: {
                rows: timeSelection,
                type: 'pie' 
            }
        });
    });
    
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.css">
<select id="DataType">
  <option value="dataDaily">Daily</option>
  <option value="dataWeekly">Weekly</option>
  <option value="dataMonthly">Monthly</option>
</select>
<div id="chart"></div>

您还可以在此JSFiddle上看到代码(和问题)的演示:http://jsfiddle.net/km97cdL3/

1 个答案:

答案 0 :(得分:4)

问题出在这一行:

var timeSelection = $("#DataType").val();

下拉列表的值是一个字符串(&#34; dataDaily&#34;,&#34; dataWeekly&#34;或&#34; dataMonthly&#34;),而不是该文字指定的数组变量字符串(dataDailydataWeeklydataMonthly)。

快速解决方案是评估(使用eval())选择的值,这样你就可以转换&#34;将字符串放入同名数组中:

var timeSelection = eval( $("#DataType").val() );

所以最终的代码如下:

&#13;
&#13;
var dataDaily = [
    ['CVR', 'TALK'],
    [90, 353]
];

var dataWeekly = [
    ['CVR', 'TALK'],
    [225, 893]
];

var dataMonthly = [
    ['CVR', 'TALK'],
    [1602, 4934]  
];

$(function () {
    
    // Initial chart
    var chart = c3.generate({
        data: {
            rows: dataDaily,
            type: 'pie'
        }
    });
    
    // Redraw chart depending on which option is selected
    $("#DataType").change(function (evt) {
        var timeSelection = eval( $("#DataType").val() );
        var chart = c3.generate({
            data: {
                rows: timeSelection,
                type: 'pie' 
            }
        });
    });
    
});
&#13;
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.css">

<select id="DataType">
  <option value="dataDaily">Daily</option>
  <option value="dataWeekly">Weekly</option>
  <option value="dataMonthly">Monthly</option>
</select>
<div id="chart"></div>
&#13;
&#13;
&#13;

您还可以在此JSFiddle上看到它正常工作:http://jsfiddle.net/km97cdL3/1/

注意:在开始使用eval()之前,如果使用不当,您应该注意其风险。 Check this question and the comments for more details