在JSF2中，Ajax呈现属性在h:dataTable中不起作用。

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。

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.

我尝试用ajax支持构建一个ToDo列表。我有一些todo字符串，我用datatable显示。在这个datatable中，我有一个commandLink来删除一个任务。现在的问题是datatable没有被重新呈现。

    <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 */
}

7 个解决方案

#1

(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别人的答案)

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建议用另一个元素来包装这个表，并使用绝对引用来引用它。从标记中，从文档的根目录中命名所有父容器。

Something like this:

是这样的:

<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，随着视图的增长，重构时间会成倍增长。

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)?

是否有一种方法可以将表从标记(防止jsf在ajax事件中添加那些烦人的“:number_of_row”)?

#2

I assume that the <h:dataTable> is enclosed by a form?

我假设被一个表单包围了?

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!

在与这个问题进行了一段时间的斗争之后，我搜索了一个简单而干净的解决方案:添加@form来呈现和voila的属性。

Full example:

完整的例子:

<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/

这篇文章的全文帮助了我:http://blogs.com/2009/10/jsf -2-hdatatable- ajax-updates/。

#3

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，并认为如果您将一个元素(例如)放在表中并重新运行它，它就会工作。但我不太清楚为什么会这样。有人知道吗?

#4

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正在修改标签中的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.

注意，第二个按钮中的id是'j_idt7:table:0'，而我希望得到'j_idt7:table'，就像我在第一个表中所做的那样。

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。

#5

use this code:

使用这段代码:

<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>

#6

You need to add prependId="false" to your h:form

你需要给你的h添加prependId="false"。

#7

I ran into the same problem.

我遇到了同样的问题。

One thing that "works" is adding richfaces to your project, and replacing the

有一件事是“有效的”，那就是在你的项目中加入richfaces，然后替换。

h:datatable

by a

由一个

rich:datatable.

Which will generate the correct id's.

这将生成正确的id。

#1