给定DataTable时Google Charts draw()方法类型错误
作者：互联网
我正在尝试使用HTML和Javascript在Google Charts中显示带有范围过滤器的折线图,但是每当我运行draw()函数时,代码就会告诉我为draw()参数使用了错误的数据数据类型(它应该是一个数据表).但是,我使用arrayToDataTable()构造了数据,根据Google Charts API documentation,该数据创建了一个DataTable.这是我的完整代码：
<html>
<head>
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
//Chart data
google.charts.load('current',{'packages':['controls']});
google.charts.setOnLoadCallback(drawDashboard);
function drawDashboard(){
var dataSet = google.visualization.arrayToDataTable([
[{label:'date',type:'datetime'},{label:'Bytes from network:Bytes to network',type:'number'}],
[new Date(2016,01,23,00,00),1.0],
[new Date(2016,01,23,01,00),1.0075187969924813],
[new Date(2016,01,23,03,00),1.126865671641791],
[new Date(2016,01,24,22,00),0.987012987012987],
[new Date(2016,01,25,01,00),1.0],
[new Date(2016,01,25,02,00),0.9166666666666666],
[new Date(2016,01,25,10,00),1.0],
[new Date(2016,01,26,12,00),1.0],
[new Date(2016,01,27,17,00),0.9864864864864865],
[new Date(2016,01,28,22,00),0.03125],
[new Date(2016,02,01,22,00),0.97],
]);
var dashboard = new google.visualization.Dashboard(document.getElementById('dashboard_div'));
var dateRangeFilter = new google.visualization.ControlWrapper({'controlType':'ChartRangeFilter','containerId':'filter_div','options': {'filterColumnLabel':'date'}});
var lineChart = new google.visualization.ChartWrapper({'chartType':'LineChart','containerId':'curve_chart','options':{'title': 'Total Bytes from the Source Network to Total Bytes To the Source Network per Day','curveType': 'function','legend': {'postition':'bottom'}}});
dashboard.bind(dateRangeFilter,lineChart);
dashboard.draw(dataSet);
}
</script>
</head>
<body>
<!--draw charts using corresponding div tags-->
<div id="dashboard_div">
<div id="filter_div"></div>
<div id="curve_chart" style="width:900px;height:500px"></div>
</div>
</body>
</html>
可以看到,我使用google.visualization.arrayToDataTable()创建了一个名为dataSet的变量,该变量返回一个DataTable.然后,在drawDashboard()方法的底部,我调用dashboard.draw(dataSet),它将引发错误.
You called the draw() method with the wrong type of data rather than a DataTable or DataView
我不确定为什么会引发此错误,因为dataSet显然是DataTable类的实例.我曾尝试多次清除缓存和Cookie,但无济于事.
解决方法:
尝试删除对http://www.google.com/jsapi的引用
您只需要loader.js
我还发现在使用loader.js时,除了“控件”外,还需要包含一些软件包
google.charts.load('current', {
packages: ['controls', 'corechart'],
callback: drawDashboard
});
function drawDashboard() {
var dataSet = google.visualization.arrayToDataTable([
[{label:'date',type:'datetime'},{label:'Bytes from network:Bytes to network',type:'number'}],
[new Date(2016,01,23,00,00),1.0],
[new Date(2016,01,23,01,00),1.0075187969924813],
[new Date(2016,01,23,03,00),1.126865671641791],
[new Date(2016,01,24,22,00),0.987012987012987],
[new Date(2016,01,25,01,00),1.0],
[new Date(2016,01,25,02,00),0.9166666666666666],
[new Date(2016,01,25,10,00),1.0],
[new Date(2016,01,26,12,00),1.0],
[new Date(2016,01,27,17,00),0.9864864864864865],
[new Date(2016,01,28,22,00),0.03125],
[new Date(2016,02,01,22,00),0.97],
]);
var dashboard = new google.visualization.Dashboard(document.getElementById('dashboard_div'));
var dateRangeFilter = new google.visualization.ControlWrapper({'controlType':'ChartRangeFilter','containerId':'filter_div','options': {'filterColumnLabel':'date'}});
var lineChart = new google.visualization.ChartWrapper({'chartType':'LineChart','containerId':'curve_chart','options':{'title': 'Total Bytes from the Source Network to Total Bytes To the Source Network per Day','curveType': 'function','legend': {'postition':'bottom'}}});
dashboard.bind(dateRangeFilter,lineChart);
dashboard.draw(dataSet);
}<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="dashboard_div">
<div id="filter_div"></div>
<div id="curve_chart" style="width:900px;height:500px"></div>
</div>标签：datatable,google-api,google-visualization,javascript 来源： https://codeday.me/bug/20191119/2032639.html