Google Charts API中的事件监听器
[英]Event Listener in Google Charts API
问题描述
I'm busy using Google Charts in one of my projects to display data in a table. 
我正在一个项目中忙于使用Google图表在表格中显示数据。 Everything is working great. 一切都很好。 Except that I need to see what line a user selected once they click a button. 除非我需要查看用户单击按钮后选择的行。
This would obviously be done with Javascript, but I've been struggling for days now to no avail. 这显然可以用Javascript完成，但是我已经苦苦挣扎了好几天了。 Below I've pasted code for a simple example of the table, and the Javascript function that I want to use (that doesn't work). 下面，我为该表的简单示例粘贴了代码，并粘贴了要使用的Javascript函数（不起作用）。
<html>
<head>
<script type='text/javascript' src='https://www.google.com/jsapi'></script>
<script type='text/javascript'>
google.load('visualization', '1', {packages:['table']});
google.setOnLoadCallback(drawTable);
var table = "";
function drawTable() {
var data = new google.visualization.DataTable();
data.addColumn('string', 'Name');
data.addColumn('number', 'Salary');
data.addColumn('boolean', 'Full Time Employee');
data.addRows(4);
data.setCell(0, 0, 'Mike');
data.setCell(0, 1, 10000, '$10,000');
data.setCell(0, 2, true);
data.setCell(1, 0, 'Jim');
data.setCell(1, 1, 8000, '$8,000');
data.setCell(1, 2, false);
data.setCell(2, 0, 'Alice');
data.setCell(2, 1, 12500, '$12,500');
data.setCell(2, 2, true);
data.setCell(3, 0, 'Bob');
data.setCell(3, 1, 7000, '$7,000');
data.setCell(3, 2, true);
table = new google.visualization.Table(document.getElementById('table_div'));
table.draw(data, {showRowNumber: true});
}
function selectionHandler() {
selectedData = table.getSelection();
row = selectedData[0].row;
item = table.getValue(row,0);
alert("You selected :" + item);
}
</script>
</head>
<body>
<div id='table_div'></div>
<input type="button" value="Select" onClick="selectionHandler()">
</body>
</html>
Thanks in advance for anyone taking the time to look at this. 在此先感谢您抽出宝贵时间来研究此问题。 I've honestly tried my best with this, hope someone out there can help me out a bit. 老实说，我已经尽力了，希望有人能帮助我。
2 个解决方案
解决方案1
7 已采纳 2011-11-22 09:48:48
Here is a working version. 这是一个工作版本。
There was no listener to the select event, and you mixed up, data and table for the getValue call. 没有侦听器选择事件，您将data和table混合在一起进行getValue调用。
<html>
<head>
<script src='https://www.google.com/jsapi'></script>
<script>
google.load('visualization', '1', {packages:['table']});
google.setOnLoadCallback(drawTable);
var table, data;
function drawTable() {
data = new google.visualization.DataTable();
data.addColumn('string', 'Name');
data.addColumn('number', 'Salary');
data.addColumn('boolean', 'Full Time Employee');
data.addRows(4);
data.setCell(0, 0, 'Mike');
data.setCell(0, 1, 10000, '$10,000');
data.setCell(0, 2, true);
data.setCell(1, 0, 'Jim');
data.setCell(1, 1, 8000, '$8,000');
data.setCell(1, 2, false);
data.setCell(2, 0, 'Alice');
data.setCell(2, 1, 12500, '$12,500');
data.setCell(2, 2, true);
data.setCell(3, 0, 'Bob');
data.setCell(3, 1, 7000, '$7,000');
data.setCell(3, 2, true);
table = new google.visualization.Table(document.getElementById('table_div'));
table.draw(data, {showRowNumber: true});
//add the listener
google.visualization.events.addListener(table, 'select', selectionHandler);
}
function selectionHandler() {
var selectedData = table.getSelection(), row, item;
row = selectedData[0].row;
item = data.getValue(row,0);
alert("You selected :" + item);
}
</script>
</head>
<body>
<div id='table_div'></div>
<input type="button" value="Select" onClick="selectionHandler()">
</body>
</html>
解决方案2
3 2011-11-22 09:00:03
Hard for me to know what wrong with your code, here example code from the documentation explain how to handle select event: 我很难知道您的代码有什么问题，在此文档中的示例代码说明了如何处理select事件：
// Create our table.
var table = new google.visualization.Table(document.getElementById('table_div'));
table.draw(data, options);
// Add our selection handler.
google.visualization.events.addListener(table, 'select', selectHandler);
// The selection handler.
// Loop through all items in the selection and concatenate
// a single message from all of them.
function selectHandler() {
var selection = table.getSelection();
var message = '';
for (var i = 0; i < selection.length; i++) {
var item = selection[i];
if (item.row != null && item.column != null) {
var str = data.getFormattedValue(item.row, item.column);
message += '{row:' + item.row + ',column:' + item.column + '} = ' + str + '\n';
} else if (item.row != null) {
var str = data.getFormattedValue(item.row, 0);
message += '{row:' + item.row + ', column:none}; value (col 0) = ' + str + '\n';
} else if (item.column != null) {
var str = data.getFormattedValue(0, item.column);
message += '{row:none, column:' + item.column + '}; value (row 0) = ' + str + '\n';
}
}
if (message == '') {
message = 'nothing';
}
alert('You selected ' + message);
}
You can give it try live code from jsfiddle 您可以尝试使用jsfiddle的实时代码
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