[英]Ajax render attribute don't work in a h:dataTable in JSF2
I have some problem's with a simple application in JSF 2.0. 我在JSF 2.0中有一个简单的应用程序存在一些问题。
I try to build a ToDo List with ajax support. 我尝试用ajax支持构建待办事项列表。 I have some todo strings which I display using a datatable.
我有一些待办事项字符串,使用数据表显示。 Inside this datatable I have a commandLink to delete a task.
在此数据表中,我具有一个CommandLink来删除任务。 The problem is now that the datatable don't get re-rendered.
现在的问题是,数据表不会重新呈现。
<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 */
}
(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他人的回答)
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,并使用<f:ajax>标记中的绝对引用(即,从文档根目录命名所有父容器)对其进行引用。
Something like this: 像这样:
<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>标记呈现表(防止jsf在ajax事件中添加那些烦人的“:number_of_row”)?
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>
I assume that the <h:dataTable> is enclosed by a form? 我假设<h:dataTable>用表格括起来了吗?
After struggling with this issue for a while, I googled an easy and clean solution: add @form to render attribute of <f:ajax> and voila! 经过一段时间的努力后,我用一个简单干净的方法在Google上搜索:将@form添加到<f:ajax>的 render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/ 完整的文章对我有帮助: http : //blogs.steeplesoft.com/2009/10/jsf-2-hdatatable-and-ajax-updates/
I ran into the same problem and figured that if you put an element (eg ) around the table and rerender that, it will work. 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)并将其重新呈现,它将起作用。 I am however not quite sure why it is that way.
但是我不太确定为什么会这样。 Anyone?
任何人?
For some reason JSF is modifying the id in the <f:ajax> tag in the button. 由于某些原因,JSF正在修改按钮中<f:ajax>标记中的id。 If I write this xhtml:
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中那样获得“ j_idt7:table”。
That doesn't solve the problem but may help to find a workaround. 那不能解决问题,但可能有助于找到解决方法。
您需要在您的h:form中添加prependId =“ false”
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