添加/删除项目时Richfaces pickList ajax事件

Is there an ajax event being fired when an item has been added to a richfaces (4.3.1.Final) pickList? I need to enable disable a button depending on if any items have been selected or not.

将项目添加到richfaces(4.3.1.Final)pickList时是否会触发ajax事件?我需要启用禁用按钮,具体取决于是否已选择任何项目。

The developer guide does not mention this at all, but I found this when googling. Using the suggested solution, I used the following ajax events:

开发者指南根本没有提到这一点,但我在谷歌搜索时发现了这一点。使用建议的解决方案,我使用了以下ajax事件:

<rich:pickList 
        var="item"
        value="#{someBean.selectedItems}">
    <a4j:ajax event="sourceblur" render="somePanelGroupWithTheButton" />
    <a4j:ajax event="targetblur" render="somePanelGroupWithTheButton" />
</rich:pickList>

This works. However, the event is fired each time the source or target list is blurred, which is too frequently for my needs.

这很有效。但是,每次源或目标列表模糊时都会触发该事件,这对我的需求来说太频繁了。

I also tried <a4j:ajax event="additems" /> and <a4j:ajax event="removeitems" />. In this case, the event is fired only on removal or adding items, exactly like I want. However, selectedItems isn't populated with the new item until after the event has been fired. This means I cannot use it to re-render the button, since the list will be empty after adding the first item, and having size one after adding the second element.

我也试过和。在这种情况下,事件仅在删除或添加项目时触发,就像我想要的那样。但是,在事件触发之前,selectedItems不会填充新项目。这意味着我无法使用它来重新渲染按钮,因为添加第一个项目后列表将为空,并且在添加第二个元素后列表大小为1。

Is there an ajax event to listen for that fires after the target list (selectedItems) has been updated? (and there must be a complete list of supported ajax events for this component somewhere, right?)

在目标列表(selectedItems)更新后,是否有一个ajax事件来侦听该触发器? (并且必须有一个完整的此组件支持的ajax事件列表,对吧?)

I also tried the change event, as suggested here, but it is not fired.

我也按照这里的建议尝试了更改事件,但它没有被触发。

2 个解决方案

#1

Just tried the change event again, and suddenly it worked. Possibly a typo from me when I first tried it. This is the way to go:

刚试了一次改变事件,突然之间就有了效果。我第一次尝试时可能是一个错字。这是要走的路:

<rich:pickList 
        var="item"
        value="#{someBean.selectedItems}">
    <a4j:ajax event="change" render="somePanelGroupWithTheButton" />
</rich:pickList>

When the event is triggered and somePanelGroupWithTheButton is re-rendered, someBean.selectedItems has been populated with the correct items.

触发事件并重新呈现somePanelGroupWithTheButton时,someBean.selectedItems已填充正确的项目。

This is a defect that was solved in 4.3.0.M2: https://issues.jboss.org/browse/RF-12360.

这是4.3.0.M2中解决的缺陷:https://issues.jboss.org/browse/RF-12360。

And the supported events for pickList can be found here: http://docs.jboss.org/richfaces/4.3.X/4.3.0.CR1/vdldoc/rich/pickList.html

pickList支持的事件可以在这里找到:http://docs.jboss.org/richfaces/4.3.X/4.3.0.CR1/vdldoc/rich/pickList.html

#2

Try this:

<rich:pickList 
        var="item"
        value="#{someBean.selectedItems}">
    <a4j:ajax event="transfer" render="somePanelGroupWithTheButton" />
</rich:pickList>

#1