通过这个code，我能够返回基于关闭的下拉列表选择一个图像。如何返回多个图像的任何想法（我试图创建与图像的ArrayList和使用UI：重复标记，以使其回到我的看法，但我没有成功这是我目前的code现在，这工作，但只有在什么办法才能让多个图像返回一个图像。任何想法？

的Java code：

（Person类有属性：私人字符串theImage;）

 公共字符串getTheImage（）{

    如果（this.theSchoolChoice.equals（阿拉巴马大学））{
        theImage =/resources/gfx/UofALogo.png;
    }

    如果（this.theSchoolChoice.equals（哈佛大学））{

    }
    返回theImage;
}
 

JSF code：

 ＆LT; H：selectOneMenu用于值=＃{person.theSchoolChoice}的风格=宽度：179px;高度：21px;＆GT;
        ＆LT; F：selectItems的值=＃{person.theOptions}/＆GT;
    ＆LT; / H：selectOneMenu用于＆GT;
    ＆LT; H：outputLabel值=/＆GT;

    ＆LT; H：的commandButton行动=提交值=获取模板的风格=FONT-SIZE：中等; FONT-FAMILY：'洛';宽度：128像素，高度：25像素;＆GT;
    ＆LT; F：Ajax事件=变渲染=形象/＆GT;
    ＆LT; / H：的commandButton＆GT;
    ＆LT; BR＆GT;＆LT; / BR＆GT;
    ＆LT; BR＆GT;＆LT; / BR＆GT;
    ＆LT; H：graphicImage的ID =形象的价值=＃{person.theImage}/＆GT;
 

解决方案

至于说在你的第一个问题有关这个问题，我建议弄个所有图像在地图＆LT;字符串列表与LT;字符串＆GT;＆GT; 其中地图关键是下拉值与映射值是图像集合

既然你似乎无法弄明白，这里有一个开球例如JSF页面应该是什么样子：

 ＆LT; H：形式GT;
    ＆LT; H：selectOneMenu用于值=＃{bean.groupName}＆GT;
        ＆LT; F：选择信息itemValue =请选择一个/＆GT;
        ＆LT; F：selectItems的值=＃{bean.groupNames}/＆GT;
        ＆LT; F：Ajax事件=变渲染=图像/＆GT;
    ＆LT; / H：selectOneMenu用于＆GT;
    ＆LT; H：panelGroup中的id =图片＆GT;
        ＆LT; UI：重复值=＃{bean.images}VAR =形象＆GT;
            ＆LT; H：graphicImage的价值=＃{}形象/＆GT;
        ＆LT; / UI：重复＆GT;
    ＆LT; /小时：panelGroup中＆GT;
＆LT; /小时：形式GT;
 

和这里是如何关联的豆应该是这样的：

  @ManagedBean
@ViewScoped
公共类豆{

    私人地图＆LT;字符串列表与LT;字符串＆GT;＆GT; allImages =新的LinkedHashMap＆LT;字符串列表与LT;字符串＆GT;＆GT;（）;
    私人列表＆LT;字符串＆GT;组名;
    私人字符串组名;

    公共豆（）{
        allImages.put（组1，Arrays.asList（group1a.jpg，group1b.jpg，group1c.jpg））;
        allImages.put（组2，Arrays.asList（group2a.jpg，group2b.jpg，group2c.jpg））;
        allImages.put（组3，Arrays.asList（group3a.jpg，group3b.jpg，group3c.jpg））;
        组名=新的ArrayList＆LT;字符串＆GT;（allImages.keySet（））;
    }

    公开名单＆LT;字符串＆GT; getImages（）{
        返回allImages.get（组名）;
    }

    公开名单＆LT;字符串＆GT; getGroupNames（）{
        返回组名;
    }

    公共字符串getGroupName（）{
        返回组名;
    }

    公共无效setGroupName（字符串组名）{
        this.groupName =组名;
    }

}
 

With this code, I am able to return one image based off of a dropdown selection. Any ideas on how to return multiple images (I have attempted to create an ArrayList with the images and use the UI:Repeat tag to render it back to my view, but I was unsuccessful. Here is my current code now, which works but only returns one image. Any ideas on what approach to take to get more than one image?

Java Code:

(Person class has attribute: private String theImage;)

public String getTheImage(){

    if(this.theSchoolChoice.equals("University of Alabama")){
        theImage = "/resources/gfx/UofALogo.png";
    }

    if(this.theSchoolChoice.equals("Harvard University")){

    }
    return theImage;
}

JSF Code:

    <h:selectOneMenu value="#{person.theSchoolChoice}" style="width : 179px; height : 21px;">
        <f:selectItems value="#{person.theOptions}"/>
    </h:selectOneMenu>
    <h:outputLabel value="  "/>

    <h:commandButton action="submit" value="Get templates" style="FONT-SIZE: medium; FONT-FAMILY: 'Rockwell';width : 128px; height : 25px;">
    <f:ajax event="change" render="image" />
    </h:commandButton>
    <br></br>
    <br></br>
    <h:graphicImage id="image" value="#{person.theImage}"/>

As told in your first question about the subject, I have suggested to get hold of all images in a Map<String, List<String>> where the map key is the dropdown value and the map value is the collection of images.

Since you can't seem to figure it out, here's a kickoff example how the JSF page should look like:

<h:form>
    <h:selectOneMenu value="#{bean.groupName}">
        <f:selectItem itemValue="Please select one" />
        <f:selectItems value="#{bean.groupNames}" />
        <f:ajax event="change" render="images" />
    </h:selectOneMenu>
    <h:panelGroup id="images">
        <ui:repeat value="#{bean.images}" var="image">
            <h:graphicImage value="#{image}" /> 
        </ui:repeat>
    </h:panelGroup>
</h:form>

And here's how the associated Bean should look like:

@ManagedBean
@ViewScoped
public class Bean {

    private Map<String, List<String>> allImages = new LinkedHashMap<String, List<String>>();
    private List<String> groupNames;
    private String groupName;

    public Bean() {
        allImages.put("group1", Arrays.asList("group1a.jpg", "group1b.jpg", "group1c.jpg"));
        allImages.put("group2", Arrays.asList("group2a.jpg", "group2b.jpg", "group2c.jpg"));
        allImages.put("group3", Arrays.asList("group3a.jpg", "group3b.jpg", "group3c.jpg"));
        groupNames = new ArrayList<String>(allImages.keySet());
    }

    public List<String> getImages() {
        return allImages.get(groupName);
    }

    public List<String> getGroupNames() {
        return groupNames;
    }

    public String getGroupName() {
        return groupName;
    }

    public void setGroupName(String groupName) {
        this.groupName = groupName;
    }

}