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您好我嘗試使用谷歌圖表來顯示趨勢線,基於從Java文件生成的一些數據。 這裏是我的代碼Google chart:如何將數據表從Java文件傳遞到JavaScript
public void resolveEvolution() {
this.evolution = new ArrayList<Long>();
this.evolutionTime = new ArrayList<String>();
Calendar first = Calendar.getInstance();
first.setTime(this.start);
first.set(Calendar.DAY_OF_MONTH, 1);
Calendar last = Calendar.getInstance();
last.setTime(this.end);
int i = 0;
this.dt = DataTable.create();
dt.addColumn(ColumnType.NUMBER, "Time");
dt.addColumn(ColumnType.NUMBER, "Utilisation");
dt.addRow();
while (first.before(last)) {
Calendar endMonth = Calendar.getInstance();
endMonth.setTime(first.getTime());
endMonth.add(Calendar.MONTH, 1);
endMonth.add(Calendar.DAY_OF_MONTH, -1);
this.evolution
.add(actionQueries.countByComponent(this.selectedComponent,
first.getTime(), endMonth.getTime()));
this.evolutionTime.add(first.get(Calendar.MONTH) + "/"
+ first.get(Calendar.YEAR));
dt.addRow();
dt.setValue(i, 0, i);
dt.setValue(i, 1,
actionQueries.countByComponent(this.selectedComponent,
first.getTime(), endMonth.getTime()));
i++;
first.add(Calendar.MONTH, 1);
}
}
public DataTable getDt() {
System.out.println(this.dt);
return this.dt;
}
一部分這裏是我的XHTML:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load("visualization", "1", {packages:["corechart"]});
google.setOnLoadCallback(drawChart);
function drawChart() {
var data = new google.visualization.DataTable();
data = "#{globalComponentsManager.dt}";
var options = {
title: 'Test',
trendlines: { 0: {} }
};
var chart = new google.visualization.ScatterChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
很顯然,這是行不通的。那麼如何將數據表從java傳遞到JavaScript?我正在使用JSF框架。謝謝。