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Question

JSF/Seam - call one component method for many radio groups

Answer 1

+2 A:

Make #{list.choose} an array, Collection or Map. A Map<String, String> wherein the key represents the category and the value represents the selected option is probably the easiest.

Here's an SSCCE which works right here (Mojarra 2.0.2 at Tomcat 6.0.24).

package com.stackoverflow.q2493671;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import javax.faces.bean.ManagedBean;
import javax.faces.model.SelectItem;

@ManagedBean
public class Bean {

    private List<String> categories;
    private List<SelectItem> selectItems;
    private Map<String, String> selectedItems = new HashMap<String, String>();

    public Bean() {
        categories = Arrays.asList("cat1", "cat2", "cat3");
        selectItems = Arrays.asList(new SelectItem("item1"), new SelectItem("item2"), new SelectItem("item3"));
    }

    public void submit() {
        for (Entry<String, String> entry : selectedItems.entrySet()) {
            String category = entry.getKey();
            String selectedItem = entry.getValue();
            System.out.println(category + "=" + selectedItem);
        }
    }

    public List<String> getCategories() {
        return categories;
    }

    public List<SelectItem> getSelectItems() {
        return selectItems;
    }

    public Map<String, String> getSelectedItems() {
        return selectedItems;
    }

}

in combination with

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"&gt;
<html xmlns="http://www.w3.org/1999/xhtml" 
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:ui="http://java.sun.com/jsf/facelets"
>
    <h:head>
        <title>SO question 2493671</title>
    </h:head>
    <h:body>
        <h:form>
            <ui:repeat value="#{bean.categories}" var="category">
                <h:selectOneRadio value="#{bean.selectedItems[category]}" layout="pageDirection">
                    <f:selectItems value="#{bean.selectItems}" />
                </h:selectOneRadio>
            </ui:repeat>
            <h:commandButton value="submit" action="#{bean.submit}" />
        </h:form>
    </h:body>
</html>

BalusC 2010-03-22 16:00:05

Thanks for the quick reply! I tried this, and the Entry Set is empty on submit. I do see `getSelectedItems()` being called for every radio group, but `setSelectedItems()` is never called, nor is the map populated...

purecharger 2010-03-22 16:40:36

It was theory, but it ought to work. So I just tried to create an SSCCE and it just works here. I've updated the question with copy'n'paste'n'runnable code. See if it works for you. If you are on JSF 1.x yet, just replace `@ManagedBean` by the obvious `<managed-bean>` declaration in `faces-config.xml`. Your problem is probably that you didn't prepopulate the `categories` as it was in the initial request.

BalusC 2010-03-22 17:05:37

By the way, JSF indeed won't call the bean setter for collections and maps. It instead first gets the collection/map and then uses its item setter (the `add()` method for collections and the `put()` method for maps).

BalusC 2010-03-22 17:13:57

I tried your example exactly, and it does work in my environment, alongside my own Seam component. However, I cannot get mine to work. I am able to display each radio group, select the buttons, see the values transported in the POST, but the `Map<String, String> selectedItems` is not populated. I've verified in both the debugger and via logging that `getSelectedItems()` is called for each radio group, and is returning the same object every time.

purecharger 2010-03-22 18:06:42

How about `categories`? It sounds like that it doesn't return the same list in the subsequent request.

BalusC 2010-03-22 18:15:03

Ah, now I understand your earlier comment, and yes I believe you are correct. I was instantiating a new `List` on every call to `getCategories()`. So now I am storing the categories in a `Map<String, List<String>`, with the key being a URL parameter. It works correctly for the first request to the page, from another page where the param is set, but subsequent requests do not have the parameter. Back to figuring out the correct `<page/>` definitions...Thanks for your help!

purecharger 2010-03-22 18:40:59

Try `a4j:keepAlive`.

BalusC 2010-03-22 18:48:22

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JSF/Seam - call one component method for many radio groups

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