<:selectOneMenu>的<a4j:support event="onchange" 没有响 - Ajax4JSF - JSF

[Ajax4JSF] <:selectOneMenu>的<a4j:support event="onchange" 没有响

lywzj2008 2009-03-21

源码是这样的，
<h:panelGroup>
<h:selectOneMenu id="selectParameter" value="#{bean.parameterName}" >
<a4j:support event="onchange" action="#{bean.doSpcCalc}"></a4j:support>
<f:selectItems id="parameterValue" value="#{bean.parameters}" />
</h:selectOneMenu>

</h:panelGroup>
后台：
String parameterName;
//seter ,geter

public void doSpcCalc() {
...
};
public List<SelectItem> getParameters() {
    List<SelectItem> items = new ArrayList<SelectItem>();
    for (String param : hash.keySet()) {
      items.add(new SelectItem(param));
    }
    return items;
}

onchang事件没有响应。当select 的值改变时。

terryzhou 2009-03-21

try actionListener

lywzj2008 2009-03-23

thank you very much! I try,

sailing19 2009-07-16

actionListener可以实现，但是用action也没有什么错。现在我碰到一个类似的问题。先看一个示例，我从网上找的：

package net.moon.jsf.bean;

import java.util.ArrayList;
import java.util.List;

import javax.faces.model.SelectItem;

public class DemoBean {
    private List<SelectItem> provinces = new ArrayList<SelectItem>();
    private List<SelectItem> cities = new ArrayList<SelectItem>();

    private String province;
    private String city;

    public List<SelectItem> getPrivinces() {
        return provinces;
    }

    public void setPrivinces(List<SelectItem> privinces) {
        this.provinces = privinces;
    }

    public List<SelectItem> getCities() {
        return cities;
    }

    public void setCities(List<SelectItem> cities) {
        this.cities = cities;
    }

    public String getPrivince() {
        return province;
    }

    public void setPrivince(String privince) {
        this.province = privince;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public DemoBean() {
        super();
        provinces.add(new SelectItem(""));
        provinces.add(new SelectItem("北京"));
        provinces.add(new SelectItem("上海"));
        // TODO Auto-generated constructor stub
    }

    public String refreshCities() {
        cities.clear();
        if (("北京").equals(province)) {
            cities.add(new SelectItem("东城区", "东城区"));
            cities.add(new SelectItem("西城区", "西城区"));
            cities.add(new SelectItem("崇文区", "崇文区"));
        }
        if ("上海".equals(province)) {
            cities.add(new SelectItem("黄浦区", "黄浦区"));
            cities.add(new SelectItem("卢湾区", "卢湾区"));
            cities.add(new SelectItem("徐汇区", "徐汇区"));
        }
        return null;
    }
}

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="f" uri="http://java.sun.com/jsf/core"%> <%@ taglib prefix="h" uri="http://java.sun.com/jsf/html"%> <%@ taglib uri="https://ajax4jsf.dev.java.net/ajax" prefix="a4j"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <f:view> <h:form>  <h:selectOneMenu id="privince" value="#{demoBean.privince}">  <f:selectItems value="#{demoBean.privinces}"/>  <a4j:support action="#{demoBean.refreshCities}" event="onchange" reRender="city"></a4j:support>  </h:selectOneMenu>  <h:selectOneMenu id="city" value="#{demoBean.city}">  <f:selectItems value="#{demoBean.cities}"/>  </h:selectOneMenu> </h:form> </f:view> </body> </html>

<managed-bean>
<managed-bean-name>demoBean</managed-bean-name>
<managed-bean-class>net.moon.jsf.bean.DemoBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>

</managed-bean>

这个我试过，没有问题。然后我自己拿来改掉了几个变量名，结果就调用不到action绑定的方法了，我觉得很奇怪。大家看下面的代码几乎跟上面一模一样，但是action的功能就不好用了。

package com.xxx.xxx;

import java.util.ArrayList;
import java.util.List;

import javax.faces.model.SelectItem;

public class Regional {
    private List<SelectItem> states = new ArrayList<SelectItem>();
    private List<SelectItem> cities = new ArrayList<SelectItem>();

    private String state;
    private String city;

    public List<SelectItem> getStates() {
        return states;
    }

    public void setStates(List<SelectItem> states) {
        this.states = states;
    }

    public List<SelectItem> getCities() {
        return cities;
    }

    public void setCities(List<SelectItem> cities) {
        this.cities = cities;
    }

    public String getState() {
        return state;
    }

    public void setState(String state) {
        this.state = state;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public Regional() {
        super();
        states.add(new SelectItem(""));
        states.add(new SelectItem("北京"));
        states.add(new SelectItem("上海"));
        // TODO Auto-generated constructor stub
    }

    public String refreshCities() {
        cities.clear();
        System.out.println("called");
        if (("北京").equals(state)) {
            cities.add(new SelectItem("东城区", "东城区"));
            cities.add(new SelectItem("西城区", "西城区"));
            cities.add(new SelectItem("崇文区", "崇文区"));
        }
        if ("上海".equals(state)) {
            cities.add(new SelectItem("黄浦区", "黄浦区"));
            cities.add(new SelectItem("卢湾区", "卢湾区"));
            cities.add(new SelectItem("徐汇区", "徐汇区"));
        }
        return null;
    }
}

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="f"  uri="http://java.sun.com/jsf/core"%>
<%@ taglib prefix="h"  uri="http://java.sun.com/jsf/html"%>
<%@ taglib uri="https://ajax4jsf.dev.java.net/ajax" prefix="a4j"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<f:view>
<h:form>
    <h:selectOneMenu id="state" value="#{regional.state}">
        <f:selectItems value="#{regional.states}"/>
        <a4j:support action="#{regional.refreshCities}" event="onchange" reRender="city"></a4j:support>
    </h:selectOneMenu>
    <h:selectOneMenu id="city" value="#{regional.city}">
        <f:selectItems value="#{regional.cities}"/>
    </h:selectOneMenu>
</h:form>
</f:view>
</body>
</html>

<managed-bean>
<managed-bean-name>regional</managed-bean-name>
<managed-bean-class>com.xxx.xxx.Regional</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>

</managed-bean>

sailing19 2009-07-16

这个论坛怎么不能编辑自己的帖子啊？

不好意思，上面帖子第一个jsp文件显示不正常，我重新排版了一下，如下：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<%@ taglib uri="https://ajax4jsf.dev.java.net/ajax" prefix="a4j"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<f:view>
<h:form>
    <h:selectOneMenu id="privince" value="#{demoBean.province}">
        <f:selectItems value="#{demoBean.provinces}"/>
        <a4j:support action="#{demoBean.refreshCities}" event="onchange" reRender="city"></a4j:support>
    </h:selectOneMenu>
    <h:selectOneMenu id="city" value="#{demoBean.city}">
        <f:selectItems value="#{demoBean.cities}"/>
    </h:selectOneMenu>
</h:form>
</f:view>
</body>
</html>

无双Rama 2009-07-16

lywzj2008 写道

lz 如果你的前台和后台代码都确保没错的话，没响应的原因就是因为你的
<a4j:support />里面少了一个reRender="你要影响的控件的id"

terryzhou 2009-07-16

action适合页面跳转，actionListener适合页面内
+<a4j:region/>

sailing19 写道

lywzj2008 2009-07-16

谢谢。

sunshineparasol 2011-01-11

借贵宝地一用
我的jsp

<h:dataTable value="#{acl.fnCodeNameList}" var="item">
    					<h:column>
	    					<h:selectBooleanCheckbox >
	    						<h:outputText value="#{item.fncode}" id="hello"></h:outputText>
	    						<a4j:support event="onclick" reRender="hello" actionListener="#{acl.save_fn}"  
	    						/>
	    					</h:selectBooleanCheckbox>
	    				</h:column>
    				</h:dataTable>

我的后台


public void save_fn(){
		System.err.println("----------save_fn---------");
	}

我的也是不响应请求,谁帮我看一下好吗?

sunshineparasol 2011-01-11

<h:dataTable value="#{acl.fnCodeNameList}" var="item">
    	<h:column>
	    					<h:selectBooleanCheckbox >
	    						<h:outputText value="#{item.fncode}" id="hello"></h:outputText>
	    						<a4j:support event="onclick" reRender="hello" actionListener="#{acl.save_fn}"  
	    						/>
	    					</h:selectBooleanCheckbox>
	    				</h:column>
    				</h:dataTable>

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[Ajax4JSF] <:selectOneMenu>的<a4j:support event="onchange" 没有响

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