troubles with primefaces linechart
I have two problems with primefaces <linechart> tag.
This is my backbean code :
public class LiveChartBean {
private Integer primaryKey;
public Integer getPrimaryKey() {
return primaryKey;
}
public void setPrimaryKey(Integer primaryKey) {
this.primaryKey = primaryKey;
}
public List<ChartData> getChartData() {
return MonitoringManager.getChartData(3);
}
}
And this is my JSF page code :
<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<开发者_高级运维;%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%>
<%@taglib uri="http://primefaces.prime.com.tr/ui" prefix="p"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSF 'LiveChart.jsp' starting page</title>
</head>
<body>
<f:view>
<p:resources/>
<h:form>
<t:inputHidden id="primaryKey" value="#{ChartBean.primaryKey}" forceId="true" />
<p:lineChart live="true" value="#{ChartBean.chartData}" var="data"
xfield="#{data.index}">
<p:chartSeries label="ResponseTime" value="#{data.data}" />
</p:lineChart>
</h:form>
</f:view>
</body>
</html>
This is my faces-config entry :
<managed-bean>
<managed-bean-name>ChartBean</managed-bean-name>
<managed-bean-class>com.pardis.healthMonitor.LiveChartBean</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
<managed-property>
<property-name>primaryKey</property-name>
<property-class>java.lang.Integer</property-class>
<value>#{param.primaryKey}</value>
</managed-property>
</managed-bean>
I have passed primaryKey by url to jsf page it works fine and the setPrimaryKey method
called for the first time but after that I have two problems :
It throws :
javax.el.ELException: Can't set property 'primaryKey'on class
com.pardis.healthMonitor.LiveChartBeanto valuenull.getChartData()method only called seven times!!!!
I think that question number 1 is because your bean is in request scope.
If you are using JSF2, you can write view instead of request in
<managed-bean-scope>view</managed-bean-scope>
If you are using JSF1.2 and RichFaces, you can use
<a4j:keepAlive name="ChartBean" />
read more about a4j:keepAlive here
If you use neither of above, consider using session scope and maybe removing the bean from the scope after using it with:
session.removeAttribute("ChartBean");
Thanks for your reply, but I think these problems are primefaces bugs!
The first problem can be solved by using the <t:savestate> tag.
I have solved the second problem with:
<p:lineChart id="Chart" value="#{ChartBean.chartData}" var="data" xfield="#{data.index}">
<p:chartSeries label="ResponseTime" value="#{data.data}" />
</p:lineChart>
<p:poll interval="5" actionListener="#{ChartBean.refresh}" update="Chart" />
By setting the live property to false and then refreshing the chart with the <poll> tag, it works fine.
加载中,请稍侯......
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