我是JS编程的新手。我想做一个选择选项,我可以在其中更改图表类型,例如从一行到另一行。数据源来自Google Spreadsheet。 JS代码如下:
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>
Select Chart Type
</title>
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load('visualization', '1', {packages: ['linechart',corechart','barchart', 'columnchart']});
</script>
<script type="text/javascript">
var graphview;
function init() {
graphview = new google.visualization.ChartWrapper({
dataSourceUrl: 'https://docs.google.com/spreadsheet/tq?tq=select%20A,B......etc
containerId: 'visualization1', chartType: 'LineChart'
graphview.draw();
}
google.setOnLoadCallback(init);
}
</script>
</head>
<body>
<div id="panelgraph", width="600", height="200">
</body>
</html>
选项如下:
<select id="graphbox" name="graphbox" onChange="getChart()">
<option value="Line">Line Chart </option>
<option value="Bar">Bar Chart</option>
<option value="Core">Area Chart</option>
<option value="Column">Column Chart</option>
</select>
我尝试创建一个函数,但不确定如何以及在何处插入它们:
var mygraphbox = document.getElementById("graphbox");
var myinsertgraphhere = document.getElementById("panelgraph");
mygraphbox.onchange =function()
我按照一些如何进行onchange选择选项功能的例子。但是当我想将它应用于我的情况时(例如使用if-else和绘制地图)我遇到了麻烦。请帮助我如何制定它以及如何将其插入JS块。
提前谢谢你, 典
答案 0 :(得分:2)
这是一个快速的解决方案;将您的JavaScript更改为:
function init () {
var graphview = new google.visualization.ChartWrapper({
chartType: 'LineChart',
containerId: 'visualization1',
dataSourceUrl: 'https://docs.google.com/spreadsheet/tq?key=<key>&gid=0',
options: {
// chart options
},
query: 'select a, b, c'
});
graphview.draw();
function changeHandler () {
graphview.setChartType(this.options[this.selectedIndex].value);
graphview.draw();
}
var mygraphbox = document.querySelector("#graphbox");
if (typeof(window.addEventListener) == 'function') {
mygraphbox.addEventListener('change', changeHandler, false);
}
else if (typeof(window.attachEvent) == 'function') {
mygraphbox.attachEvent('onchange', changeHandler);
}
}
google.load('visualization', '1', {packages: ['corechart'], callback: init});
并更改选择框,如下所示:
<select id="graphbox">
<option value="LineChart">Line Chart </option>
<option value="BarChart">Bar Chart</option>
<option value="AreaChart">Area Chart</option>
<option value="ColumnChart">Column Chart</option>
</select>
使用此功能,您可以更改图表类型,而无需重新提交查询。