selectOneMenu选择后,JSF更新inputText [英] JSF update inputText after selectOneMenu choice
问题描述
当我从selectOneMenu中选择另一个外观时,我想更改inputTexts的值. 一切正常,我的Converter从菜单中返回了正确的Object,但是inputTexts没有更新.
I want to change the inputTexts' values when I choose another Skin from my selectOneMenu. Everything is doing well, my Converter gives back the right Object from the menu, but the inputTexts are not updated.
<h:form>
<h:selectOneMenu id="dropdownSkin"
value="#{helloBean.currentSkin}" defaultLabel="Select a skin.."
valueChangeListener="#{helloBean.skinValueChanged}" immediate="true"
onchange="this.form.submit()" converter="SkinConverter" >
<f:selectItems value="#{helloBean.mySkinsSI}" var="c"
itemValue="#{c.value}" />
</h:selectOneMenu>
<br />
<h:inputText id="name" value="#{helloBean.currentSkin.title}"></h:inputText>
<br />
<h:inputText id="tcolor" value="#{helloBean.currentSkin.titleBar.textColor}"></h:inputText>
<br />
<h:inputText id="bcolor" value="#{helloBean.currentSkin.titleBar.backgroundColorStart}"></h:inputText>
</h:form>
这是我的Bean的外观.我调试了它,并正确设置了对象currentSkin.现在,我需要知道如何更新文本字段的内容.
Here is what my Bean looks like. I debugged it and the Object currentSkin is set correctly. Now i need to know how to update the textfields content.
@ManagedBean
@SessionScoped
public class HelloBean implements Serializable {
private static final long serialVersionUID = 1L;
private List<ExtendedSkin> mySkins;
private List<SelectItem> mySkinsSI;
private ExtendedSkin currentSkin;
public void skinValueChanged(ValueChangeEvent e) {
currentSkin = (ExtendedSkin) e.getNewValue();
FacesContext.getCurrentInstance().renderResponse();
}
public List<ExtendedSkin> getMySkins() {
mySkins = XMLParser.readExtendedSkins();
return mySkins;
}
public List<SelectItem> getMySkinsSI() {
mySkinsSI = new LinkedList<SelectItem>();
for (ExtendedSkin s : getMySkins()) {
mySkinsSI.add(new SelectItem(s, s.getTitle()));
}
return mySkinsSI;
}
public void setMySkinsSI(List<SelectItem> myItems) {
this.mySkinsSI = myItems;
}
public ExtendedSkin getCurrentSkin() {
if (currentSkin == null) {
currentSkin = getMySkins().get(0);
}
return currentSkin;
}
public void setCurrentSkin(ExtendedSkin currentSkin) {
this.currentSkin = currentSkin;
}
}
推荐答案
此处的问题是转换器正在填充helloBean.currentSkin
对象,但是<h:inputText>
中绑定到此title
,textColor
和backgroundColorStart
将发送到服务器,并替换converter
加载的实际值.换句话说:
The problem here is that the converter is doing its work filling the helloBean.currentSkin
object, but the values in the <h:inputText>
that are bounded to this helloBean.currentSkin
: title
, textColor
and backgroundColorStart
will be send to the server and replace the actual values that were loaded by the converter
. In other words:
- 将执行转换器,并根据所选值构建
helloBean.currentSkin
. -
<h:inputText id="name">
空值将发送到服务器,并将注入到helloBean.currentSkin.title
中.其他2个<h:inputText>
行为相同. - 将使用选定的
helloBean.currentSkin
加载视图,并将使用空值加载helloBean.currentSkin.title
.其他2个<h:inputText>
行为相同.
- The converter is executed and builds the
helloBean.currentSkin
based on the selected value. - The
<h:inputText id="name">
empty value is sent to server and will be injected inhelloBean.currentSkin.title
. Same behavior for the other 2<h:inputText>
s. - The view will be loaded using the selected
helloBean.currentSkin
and it will load thehelloBean.currentSkin.title
with the empty value. Same behavior for the other 2<h:inputText>
s.
有两个可能的解决方案:
There are two possible solutions to this problem:
-
将
<h:inputText>
移到表单外,因此不会将空值发送到服务器.加载视图时,它将保持在转换器中加载的值.
Move the
<h:inputText>
s outside the form, so the empty values won't be send to the server. When loading the view, it will maintain the values loaded in the converter.
<h:form>
<h:selectOneMenu id="dropdownSkin"
value="#{helloBean.currentSkin}" defaultLabel="Select a skin.."
valueChangeListener="#{helloBean.skinValueChanged}" immediate="true"
onchange="this.form.submit()" converter="SkinConverter" >
<f:selectItems value="#{helloBean.mySkinsSI}" var="c"
itemValue="#{c.value}" />
</h:selectOneMenu>
</h:form>
<br />
<h:inputText id="name" value="#{helloBean.currentSkin.title}"></h:inputText>
<!-- rest of Facelets code... -->
Since you're loading the helloBean.currentSkin
while changing the selected value on your dropdownlist, you can add ajax behavior using <f:ajax>
tag component inside the <h:selectOneMenu>
and update the fields in a cleaner way. I would opt for this solution.
<h:form>
<!-- Note that there's no need of the onchange JavaScript function -->
<h:selectOneMenu id="dropdownSkin"
value="#{helloBean.currentSkin}" defaultLabel="Select a skin.."
valueChangeListener="#{helloBean.skinValueChanged}" immediate="true"
converter="SkinConverter" >
<f:selectItems value="#{helloBean.mySkinsSI}" var="c"
itemValue="#{c.value}" />
<f:ajax process="@this" render="name tcolor bcolor" />
</h:selectOneMenu>
<br />
<h:inputText id="name" value="#{helloBean.currentSkin.title}" />
<h:inputText id="tcolor" value="#{helloBean.currentSkin.titleBar.textColor}" />
<br />
<h:inputText id="bcolor"
value="#{helloBean.currentSkin.titleBar.backgroundColorStart}" />
</h:form>
您可以在诸如由于要在页面中使用ajax调用,因此应将托管bean范围从@SessionScoped
更改为@ViewScoped
.有关此信息,请参见: JSF 2中的通信
Since you're going to use an ajax call in your page, you should change your managed bean scope from @SessionScoped
to @ViewScoped
. More info about this here: Communication in JSF 2
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