javascript 如何使用 <a4j:jsFunction><a4j:actionparam>
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How to use <a4j:jsFunction><a4j:actionparam>
提问by Michael
I'm trying to use:
我正在尝试使用:
<script type="text/javascript">
function myfunc() {
var param = 4;
alert("OK");
}
</script>
I call the function like this:
我这样调用函数:
<a4j:jsFunction name="myfunc">
<a4j:actionparam name="param" assignTo="#{MyBean.myfield}"/>
</a4j:jsFunction>
But it does not work. In what may be the reason?
但它不起作用。可能是什么原因?
回答by BalusC
You misunderstood the purpose of <a4j:jsFunction>
. It autogeneratesa JavaScript function which you can then call from any JavaScript code in your view.
你误解了 的目的<a4j:jsFunction>
。它会自动生成一个 JavaScript 函数,然后您可以从视图中的任何 JavaScript 代码调用该函数。
Your example,
你的例子,
<a4j:jsFunction name="myfunc">
<a4j:actionparam name="param" assignTo="#{MyBean.myfield}"/>
</a4j:jsFunction>
will autogeneratethe following function
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>
You do notneed to define it yourself. You only need to invokeit yourself from some JavaScript code elsewhere. For example,
你不是需要自己定义。您只需要从其他地方的一些 JavaScript 代码中自己调用它。例如,
<span onclick="myfunc(4)">click here to set 4 in MyBean.myfield</span>
or
或者
<script>
function someOtherFunction() {
var param = 4;
myfunc(param);
}
</script>
which is in turn to be used like
反过来又可以像
<span onclick="someOtherFunction()">click here to call someOtherFunction() which will in turn set 4 in MyBean.myfield</span>
See also:
也可以看看:
回答by Grim
<a4j:jsFunction
is not used to call an function, it is used to define an function.
不是用来调用函数,而是用来定义函数。
So, if MyBean.myfield is an int-field you can set the value 2 using:
因此,如果 MyBean.myfield 是一个整数字段,您可以使用以下方法设置值 2:
<script>myfunc(2);</sript>
回答by Mark Kramer
There's a bunch of different ways to call that function.
有很多不同的方法可以调用该函数。
Two you will find particularly useful are:
您会发现特别有用的两个是:
This:
这:
<body onload="myfunc();">
Example: http://ultimatemmo.webege.com/Test.html
示例:http: //ultimatemmo.webege.com/Test.html
and this:
还有这个:
<a href="#" onclick="myfunc();">Click here to execute function</a>
Example: http://ultimatemmo.webege.com/Test2.html
示例:http: //ultimatemmo.webege.com/Test2.html
Edit:added examples.
编辑:添加示例。
回答by Reporter
According you snippet of code, you have never called your function. Add myfunc();
within your script tag.
根据您的代码片段,您从未调用过您的函数。添加myfunc();
脚本标签内。