如何使用< a4j:jsFunction>< a4j:actionparam> [英] How to use <a4j:jsFunction><a4j:actionparam>

问题描述

我正在尝试使用:

<script type="text/javascript">
      function myfunc() {
         var param = 4;
         alert("OK");
      }
</script>

我这样调用函数:

<a4j:jsFunction name="myfunc">
    <a4j:actionparam name="param" assignTo="#{MyBean.myfield}"/>
</a4j:jsFunction>

但是它不起作用.可能是什么原因?

But it does not work. In what may be the reason?

推荐答案

您误解了<a4j:jsFunction>的目的.它会自动生成一个JavaScript函数，然后您可以从视图中的任何JavaScript代码中调用该函数.

You misunderstood the purpose of <a4j:jsFunction>. It autogenerates a JavaScript function which you can then call from any JavaScript code in your view.

您的示例

<a4j:jsFunction name="myfunc">
    <a4j:actionparam name="param" assignTo="#{MyBean.myfield}"/>
</a4j:jsFunction>

将自动生成以下功能

<script>
    function myfunc(param) {
        // Here some specific JSF Ajax script which assigns "param"
        // to a managed bean property #{MyBean.myfield}
    }
</script>

您不需要需要自己定义.您只需要自己从其他地方的一些JavaScript代码中调用即可.例如，

You do not need to define it yourself. You only need to invoke it yourself from some JavaScript code elsewhere. For example,

<span onclick="myfunc(4)">click here to set 4 in MyBean.myfield</span>

或

<script>
    function someOtherFunction() {
        var param = 4;
        myfunc(param);
    }
</script>

依次使用

<span onclick="someOtherFunction()">click here to call someOtherFunction() which will in turn set 4 in MyBean.myfield</span>

另请参见:

• <a4j:jsFunction>展示示例

See also:

• <a4j:jsFunction> component reference
• <a4j:jsFunction> showcase example

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