Javascript 谷歌可视化点击事件
我正在使用google Visualization绘制饼图。我面临的问题是,我无法在饼图上捕获单击事件。我就是这样做的Javascript 谷歌可视化点击事件,javascript,jquery,google-visualization,Javascript,Jquery,Google Visualization,我正在使用google Visualization绘制饼图。我面临的问题是,我无法在饼图上捕获单击事件。我就是这样做的 function drawchartfromRe() { dashboard = new google.visualization.Dashboard( document.getElementById('dashboard_div')); //alert("RefuelLength"+totrefuelList.length);
function drawchartfromRe()
{
dashboard = new google.visualization.Dashboard(
document.getElementById('dashboard_div'));
//alert("RefuelLength"+totrefuelList.length);
//alert("Vehicleid:"+totrefuelList[0].vehicleId);
//google.load("visualization", "1", {packages:["corechart"]});
data = new google.visualization.DataTable();
data.addColumn('string', 'Task');
data.addColumn('number', 'Quantity');
data.addRows(totrefuelList.length);
for (var i=0;i<totrefuelList.length;i++)
{
data.setValue(i, 0, totrefuelList[i].vehicleName);
data.setValue(i, 1, totrefuelList[i].totalRefuelQty);
}
// var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart = new google.visualization.ChartWrapper({
'chartType': 'PieChart',
'containerId': 'chart_div',
'options': {
title: 'Refuel Trend',
height:'500',
width:'400',
backgroundColor: { fill:'transparent' },
'legend': 'right'
}
});
/* google.visualization.events.addListener(chart, 'select', function(e) {
// var selection = chart.getSelection();
var vehid= data.getValue(visualization.getSelection()[0].row, 0);
getRefueldailywise(vehid);
});*/
// chart.draw(data, options);
drawDashboard(dashboard,data,chart);
google.visualization.events.addListener(chart, 'select', function() {
// grab a few details before redirecting
alert(data.getValue(chart.getSelection()[0].row, 0));
//location.href = 'http://www.google.com?row=' + row + '&col=' + col + '&year=' + year;
});
}
函数drawchartfromRe()
{
dashboard=新建google.visualization.dashboard(
document.getElementById('dashboard_div');
//警报(“加油长度”+加油长度);
//警报(“Vehicleid:+totrefuelList[0]。Vehicleid”);
//load(“可视化”、“1”、{packages:[“corechart”]});
data=new google.visualization.DataTable();
data.addColumn('string','Task');
data.addColumn('number','Quantity');
data.addRows(totreuellist.length);
对于(var i=0;i图表包装器不是图表对象,没有单击事件。实际上,只有选择
如果你说:
为包装器创建一个ready
事件
让就绪
事件触发包装器中图表的选择
事件
以下是他们给出的示例:
var wrapper;
function drawVisualization() {
// Draw a column chart
wrapper = new google.visualization.ChartWrapper({
chartType: 'ColumnChart',
dataTable: [['Germany', 'USA', 'Brazil', 'Canada', 'France', 'RU'],
[700, 300, 400, 500, 600, 800]],
options: {'title': 'Countries'},
containerId: 'visualization'
});
// Never called.
google.visualization.events.addListener(wrapper, 'onmouseover', uselessHandler);
// Must wait for the ready event in order to
// request the chart and subscribe to 'onmouseover'.
google.visualization.events.addListener(wrapper, 'ready', onReady);
wrapper.draw();
// Never called
function uselessHandler() {
alert("I am never called!");
}
function onReady() {
google.visualization.events.addListener(wrapper.getChart(), 'onmouseover', usefulHandler);
}
// Called
function usefulHandler() {
alert("Mouseover event!");
}
}
因此,在您的情况下,您需要更改此部分:
google.visualization.events.addListener(chart, 'ready', function() {
// grab a few details before redirecting
alert(data.getValue(chart.getSelection()[0].row, 0));
//location.href = 'http://www.google.com?row=' + row + '&col=' + col + '&year=' + year;
});
对这样的事情:
google.visualization.events.addListener(chart, 'ready', function() {
// grab a few details before redirecting
google.visualization.events.addListener(chart.getChart(), 'select', function() {
chartObject = chart.getChart();
alert(data.getValue(chartObject.getSelection()[0].row, 0));
});
//location.href = 'http://www.google.com?row=' + row + '&col=' + col + '&year=' + year;
});
在您的示例中,还有一个名为“chart”的变量,即google.visualization.events.addListener(图表,'select',function()…此处您声明了图表变量..实际上在您的示例中只有一个变量..“wrapper”…请您解释一下对不起,我在底部的示例中犯了一系列错误,所以我对其进行了更新。重点是包装器不是图表,它是一个包装器。wrapperObject.getchart()
将返回包装器中的图表对象。您需要在chart.getchart()
上设置侦听器,而不是在图表本身上设置侦听器。(您可能还希望将对象的名称从“chart”更改为“wrapper”,以使变量名称也包含该区别)当我尝试你的例子时,jmac先生,我得到了一个错误,数据没有定义
。我认为数据
是google可视化变量。@Charles,介意用你的代码问一个单独的问题吗?如果数据没有定义,可能有多种原因,但可能与事件处理程序完全无关。的确,jmac..我设法跟踪了问题并不完全与事件有关,而是与我的变量命名有关