执行操作后查看范围将字段重置为默认值
首先,我的 bean 由 spring 管理,而不是由 JSF 管理,并且我使用自定义视图范围,如 本文。因此,如果该行为对于常规 JSF2 来说很奇怪并且可能与 Spring 有关,请告诉我。
Bean:
public class DepartmentBean {
private DefaultTreeModel model;
public void preRender(ComponentSystemEvent event) throws Exception {
if (model == null) {
model = myService.buildModel();
}
}
public String clear() {
// resetting stuff
return "pretty:";
}
}
视图:
<h:form>
<ice:panelGroup styleClass="crud-links">
<h:commandLink value="Delete" action="#{department.deleteDepartment}" />
</ice:panelGroup>
</h:form>
<h:form>
<ice:panelGroup>
<ice:tree id="tree" value="#{department.model}" var="item" hideRootNode="false" hideNavigation="false" imageDir="./xmlhttp/css/xp/css-images/">
<ice:treeNode>
<f:facet name="content">
<ice:panelGroup style="display: inline">
<ice:commandLink value="#{item.userObject.text}"></ice:commandLink>
</ice:panelGroup>
</f:facet>
</ice:treeNode>
</ice:tree>
</ice:panelGroup>
</h:form>
第一次加载页面时,model
对象会填充数据,但是当单击删除按钮时,我注意到清除 preRender()
方法后会执行并且模型(在清除之前填充的模型变为空,并再次填充,尽管我在同一页面中,并且它应该保持该值)
代码是否存在导致此类行为的问题,或者这是正常行为? 如果问题可能与 Spring 或自定义视图范围或 IceFaces 有关,请告知。
更新-要求:
我想在构建页面时初始化树模型,当我仍在页面上时,树模型不会再次初始化,直到我以编程方式执行此操作。
First of all, my beans are managed by spring not by JSF and I am using custom view scope as described in this article. So if the behavior is weird for regular JSF2 and might be related to Spring, please tell me.
Bean:
public class DepartmentBean {
private DefaultTreeModel model;
public void preRender(ComponentSystemEvent event) throws Exception {
if (model == null) {
model = myService.buildModel();
}
}
public String clear() {
// resetting stuff
return "pretty:";
}
}
View:
<h:form>
<ice:panelGroup styleClass="crud-links">
<h:commandLink value="Delete" action="#{department.deleteDepartment}" />
</ice:panelGroup>
</h:form>
<h:form>
<ice:panelGroup>
<ice:tree id="tree" value="#{department.model}" var="item" hideRootNode="false" hideNavigation="false" imageDir="./xmlhttp/css/xp/css-images/">
<ice:treeNode>
<f:facet name="content">
<ice:panelGroup style="display: inline">
<ice:commandLink value="#{item.userObject.text}"></ice:commandLink>
</ice:panelGroup>
</f:facet>
</ice:treeNode>
</ice:tree>
</ice:panelGroup>
</h:form>
When page is loaded for first time the model
object is populated with data, but when clicking delete button I notice that after clearing preRender()
method is executed and the model (which was populated before clearing becomes null, and gets populated again, although I am in same page, and it should maintain the value)
Does the code have a problem that leads to such behavior, or this is the normal behavior?
If the problem maybe related to Spring or the custom view scope or the IceFaces, please advise.
UPDATE- REQUIREMENT:
I want to initialize the tree model on construction of the page, and while i am still on the page the tree model doesn't gets initialized again until i do that programatically .
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哦,我的错误,初始化应该在@PostConstruct 内部。
oh my mistake, initialization should be inside @PostConstruct.