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Editorial Team
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Asked: 2026-06-13T14:40:11+00:00

I am using JSP tag files to add widgets to my application pages. Is

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I am using JSP tag files to add “widgets” to my application pages.

Is it possible to have an action associated with a JSP tag file, so it will be populated with dynamic content just like a normal page and then “injected” in some place?

Let’s say I have tag file that I invoke like this: <c:onlinemembers />. It displays the list of online members.
I need to have a way of populating it with dynamic data before it is displayed.

Any suggestions?

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1 Answer

  1. Editorial Team

    EDIT: as pointed out by Alexandr, this is good on Struts 2.0.x, where Struts integrates Dojo tags. Since Struts 2.1.x, jQuery should be used instead (with similar mechanism).

    All depends on your Struts2 version.

    OR you can use the built-in Struts2/Dojo AJAX feature.

    <head>
    <script type="text/javascript">
      // Scripts executed when loading the JSP:
      function configPage(){
        // Dojo topic function subscribing:
        dojo.event.topic.getTopic("myTopic").subscribe(null, "updateDivFunction");
      }

      function updateDivFunction(param1, param2){
        // Get the Div
        var myDiv = dojo.widget.byId("myDynamicDiv"); 

        // Set a new href to the AJAX action to call, 
        // which will return a partial JSP (a snippet),
        // as mapped normally in struts.xml...      
        myDiv.href = "loadDynamicDivAjax.do?param1="+param1+"&param2="+param2;

        // Force the div to reload with AJAX now.
        resultDiv.refresh();
      }

      function updateDivWrapper(param1, param2){
        // Publishing the topic now, will invoke the 
        // "updateDivFunction" set in configPage()...
        dojo.event.topic.publish("myTopic", param1, param2);
      }


    </script>
</head>

<body onload="javascript:configPage();">
    <h1>My main JSP page</h1>

    <br/><br/>

    <s:div id="myDynamicDiv" theme="ajax" 
           loadingText="Loading..." 
           errorText="Errors occurred...">
    </s:div>

    <br/>

    <span>
        Click below links to load the DIV with DOJO 
        through an AJAX call, and different parameters.
    </span>

    <br/><br/>

    <a href="javascript:updateDivWrapper('1','2')">
        Update with param1=1 and param2=2
    </a>

    <br/><br/>

    <a href="javascript:updateDivWrapper('8','9')">
        Update with param1=8 and param2=9
    </a>
</body>

    in Struts.xml you should map loadDynamicDivAjaxAction to returning a normal JSP snippet as a result. That’s it…

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