支撑杆动态表达

Question

I've spent the last few hours to get a Struts expression to work as I want but didn' t succeeded.

I want to execute a OGNL expression from a String.

By example, I have the following code :

<s:push value="#row">

    alert('<s:property value="id + ' ' + id" />');

</s:push>

This works perfectly giving me the id of the object twice.

This example

<s:push value="#row">

    <s:set name="expr" value="id + ' ' + id"/>
    alert('<s:property value="%{#expr}" />');

</s:push>

works fine too.

But now, if I create a method in my action :

public String getTest() {

    return "id + ' ' + id";
}

and in the JSP :

<s:set name="expr" value="getTest()"/>

<s:push value="#row">

    alert('<s:property value="%{#expr}" />');

</s:push>

The result is :

alert('id + ' ' + id'); 

which doesn't work because of quotes.

But why in my last example I have the String value and not the expression evaluated ?

I've tried a lot of possibilities, read articles, tutorials but didn't find a suitable answer to my problem.

Answer 1

Struts 2 escapes the ActionMessages by default.

Try <s:property value="%{#expr}" escape="false"/>

UDPATE

Try

alert(<s:property value="%{#expr}" />);

Not

alert('<s:property value="%{#expr}" />');