有一种简单的方法可以在调用之前和之后调用 JavaScript 操作<f:ajax listener>
,例如我想调用window.alert("pre")
before and window.alert("post")
after onChange
在支持 bean 中调用ACtrl
:
<h:form>
<h:inputText id="anId" value="#{cityCtrl.dbHost}">
<f:ajax event="change" listener="#{aCtrl.onChange}" execute="@all"/>
</h:inputText>
</h:form>
@ManagedBean
public class ACtrlimplements Serializable {
public void onChange(AjaxBehaviorEvent event) {
System.out.println("something changed");
}
}
添加多个f:ajax
elements 似乎不起作用(也许应该?!),例如在
<h:form>
<h:inputText id="anId" value="#{cityCtrl.dbHost}">
<f:ajax event="change" listener="#{aCtrl.toggle}" execute="@all"/>
<f:ajax event="change" listener="#{aCtrl.onChange}" execute="@all"/>
<f:ajax event="change" listener="#{aCtrl.toggle}" execute="@all"/>
</h:inputText>
</h:form>
@ManagedBean
public class ACtrlimplements Serializable {
public void onChange(AjaxBehaviorEvent event) {
System.out.println("something changed");
}
public void toggle(AjaxBehaviorEvent event) {
System.out.println("blah");
}
}
only ACtrl.onChange
被调用。
Use onevent http://docs.oracle.com/javaee/7/javaserverfaces/2.2/vdldocs/facelets/f/ajax.html属性。它必须指向回调函数引用(因此不要包含括号!):
<f:ajax ... onevent="functionName" />
实际的回调函数如下所示(JSF 将自行提供参数):
function functionName(data) {
var status = data.status; // Can be "begin", "complete" or "success".
var source = data.source; // The parent HTML DOM element.
switch (status) {
case "begin": // Before the ajax request is sent.
// ...
break;
case "complete": // After the ajax response is arrived.
// ...
break;
case "success": // After update of HTML DOM based on ajax response.
// ...
break;
}
}
也可以看看:
-
JSF 2.0 规范 http://download.oracle.com/otndocs/jcp/jsf-2.0-fr-eval-oth-JSpec/- 表 14.3 和 14.4
- 有没有办法禁用命令链接,直到呈现 ajax 响应 https://stackoverflow.com/questions/17734543/is-there-a-way-to-disable-the-command-link-until-the-ajax-response-is-rendered/
- 如何在 JSF 2 中防止双击 https://stackoverflow.com/questions/10756426/how-to-do-double-click-prevention-in-jsf-2/
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