Java Ajax 渲染属性在 JSF2 中的 ah:dataTable 中不起作用
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Ajax render attribute don't work in a h:dataTable in JSF2
提问by u2ix
I have some problem's with a simple application in JSF 2.0.
我对 JSF 2.0 中的一个简单应用程序有一些问题。
I try to build a ToDo List with ajax support. I have some todo strings which I display using a datatable. Inside this datatable I have a commandLink to delete a task. The problem is now that the datatable don't get re-rendered.
我尝试使用 ajax 支持构建一个待办事项列表。我有一些使用数据表显示的待办事项字符串。在这个数据表中，我有一个 commandLink 来删除一个任务。现在的问题是数据表不会被重新渲染。
<h:dataTable id="todoList" value="#{todoController.todos}" var="todo">
<h:column>
<h:commandLink value="X" action="#{todoController.removeTodo(todo)}">
<f:ajax execute="@this" render="todoList" />
</h:commandLink>
</h:column>
<h:column>
<h:outputText value="#{todo}"/>
</h:column>
</h:dataTable>
Thanks for your help.
谢谢你的帮助。
Edit (TodoController):
编辑（TodoController）：
@ManagedBean
@SessionScoped
public class TodoController {
private String todoStr;
private ArrayList<String> todos;
public TodoController() {
todoStr="";
todos = new ArrayList<String>();
}
public void addTodo() {
todos.add(todoStr);
}
public void removeTodo(String deleteTodo) {
todos.remove(deleteTodo);
}
/* getter / setter */
}
采纳答案by Toni Penya-Alba
(Looks like I don't have enough reputation to comment on others' answers)
（看起来我没有足够的声誉来评论其他人的答案）
I think FRotthowe suggests wrapping the table with another element and referencing it using absolute reference (ie. naming all the parent containers from the root of the document) from the <f:ajax> tag.
我认为 FRotthowe 建议用另一个元素包装表格并使用 <f:ajax> 标签中的绝对引用（即从文档的根命名所有父容器）来引用它。
Something like this:
像这样的东西：
<h:form id="form">
<h:panelGroup id ="wrapper">
<h:dataTable value="#{backingBean.data}" var="list">
<h:column>
<h:commandButton value="-" action="#{backingBean.data}">
<f:ajax render=":form:wrapper"/>
</h:commandButton>
</h:column>
</h:dataTable>
</h:panelGroup>
</h:form>
But, using absolute references is always a source of problems and increases exponentially the refactoring time as the view grows.
但是，使用绝对引用始终是问题的根源，并且随着视图的增长，重构时间呈指数增长。
Isn't there a way to just render the table from a <f:ajax> tag (prevent jsf from adding those annoying ":number_of_row" in the ajax event)?
有没有办法只从 <f:ajax> 标签渲染表（防止 jsf 在 ajax 事件中添加那些烦人的“:number_of_row”）？
回答by FRotthowe
I ran into the same problem and figured that if you put an element (e.g. ) around the table and rerender that, it will work. I am however not quite sure why it is that way. Anyone?
我遇到了同样的问题，并认为如果您在表格周围放置一个元素（例如 ）并重新渲染它，它将起作用。然而，我不太确定为什么会这样。任何人？
回答by Toni Penya-Alba
For some reason JSF is modifying the id in the <f:ajax> tag in the button. If I write this xhtml:
出于某种原因，JSF 正在修改按钮中 <f:ajax> 标记中的 id。如果我写这个xhtml：
<h:form id="form">
<h:commandButton value="Button">
<f:ajax render="table"/>
</h:commandButton>
<h:dataTable id="table" value="#{tableData.data}">
<h:column>
<h:commandButton value="Button">
<f:ajax render="tocoto"/>
</h:commandButton>
</h:column>
</h:dataTable>
</h:form>
I get this html:
我得到这个 html：
<form id="j_idt7" name="j_idt7" method="post" action="/WebApplication1/faces/index.xhtml" enctype="application/x-www-form-urlencoded">
<input type="hidden" name="j_idt7" value="j_idt7" />
<input id="j_idt7:j_idt8" type="submit" name="j_idt7:j_idt8" value="Button" onclick="mojarra.ab(this,event,'action',0,'j_idt7:table');return false" />
<table id="j_idt7:table"><tbody>
<tr>
<td><input id="j_idt7:table:0:j_idt10" type="submit" name="j_idt7:table:0:j_idt10" value="Button" onclick="mojarra.ab(this,event,'action',0,'j_idt7:table:0');return false" /></td>
</tr>
</tbody></table>
<input type="hidden" name="javax.faces.ViewState" id="javax.faces.ViewState" value="-7634557012794378167:1020265910811114103" autocomplete="off" />
</form>
Notice that the id in the second button is 'j_idt7:table:0' while I'm expecting to get 'j_idt7:table' as I do in the first one.
请注意，第二个按钮中的 id 是“j_idt7:table:0”，而我希望像第一个按钮一样得到“j_idt7:table”。
That doesn't solve the problem but may help to find a workaround.
这并不能解决问题，但可能有助于找到解决方法。
回答by user307434
You need to add prependId="false" to your h:form
您需要将 prependId="false" 添加到您的 h:form
回答by zarazek
I assume that the <h:dataTable>is enclosed by a form?
我假设<h:dataTable>包含在表单中？
After struggling with this issue for a while, I googled an easy and clean solution: add @formto renderattribute of <f:ajax>and voila!
在这个问题上挣扎了一段时间后，我用谷歌搜索了一个简单而干净的解决方案：添加@form到<f:ajax> 的渲染属性，瞧！
Full example:
完整示例：
<h:form id="theForm">
<h:dataTable id="table" value="#{tasksMgr.allTasks}" var="task">
<h:column>
#{task.name}
</h:column>
<h:column>
<h:commandButton id="removeTaskButton" value="X" action="#{tasksMgr.removeTask(task)}">
<f:ajax render="@form" />
</h:commandButton>
</h:column>
</h:dataTable>
</h:form>
The full article which helped me is here: http://blogs.steeplesoft.com/2009/10/jsf-2-hdatatable-and-ajax-updates/
帮助我的完整文章在这里：http: //blogs.steeplesoft.com/2009/10/jsf-2-hdatatable-and-ajax-updates/
回答by IJC
回答by shahab kondri
use this code:
使用此代码：
<h:form id="form">
<h:panelGroup id="panel">
<h:dataTable id="todoList" value="#{todoController.todos}" var="todo">
<h:column>
<h:commandLink value="X" action="#{todoController.removeTodo(todo)}">
<f:ajax render=":form:panel" />
</h:commandLink>
</h:column>
<h:column>
<h:outputText value="#{todo}"/>
</h:column>
</h:dataTable>
</h:panelGroup>
</h:form>
