How to pass JSON object to Struts2 tag

Question

I am getting JSON object via ajax call using JQuery. JSON object contains list of model (i.e Bean)

e.g List<myModel>

I am using struts2 json plugin.

JSON object as a string looks as given below.

{"myList":[{"age":26,"degree":"MCA","fname":"Pravin","id":1,"lname":"Varpe"},
{"age":26,"degree":"MCA","fname":"Pramod","id":2,"lname":"Patil"},
{"age":24,"degree":"B.E","fname":"Atul","id":3,"lname":"Vairale"},
{"age":22,"degree":"M.E","fname":"Sudeep","id":4,"lname":"Masare"},
{"age":21,"degree":"BCS","fname":"Nikhil","id":1,"lname":"Pethe"},
{"age":21,"degree":"MCS","fname":"Abhijeet","id":1,"lname":"Supekar"}]}

I want to pass this JSON object to <s:iterator> tag as given below

<s:iterator value = "myJsonObject">
     <s:property value = "fname"/>
     // properties 
</s:iterator>

I can display this JSON object on jsp by iterating it into jquery function & creating html element but I don't want to do that. So is it possible to directly pass JSON to <s:iterator> tag anyhow?

Because I want to use ajax functionality i.e I don't want to reload the page. Is there any another way that i can get a values on JSP from action without reloading the page? — Pravin Varpe, May 05 '14 at 10:28
You are probably doing it already... using `dispatcher` result `/WEB-INF/...`. :) — Aleksandr M, May 05 '14 at 10:40
But using dispatcher we just redirect to the JSP page where html code is already created. In my case as you said, I need to create & return html code from within action class. How can i do that? And second thing when we use dispatcher, page will reload. Where JSON result type prevents page reload. — Pravin Varpe, May 05 '14 at 10:49
What stops you to return `dispatcher` result from ajax called action? — Aleksandr M, May 05 '14 at 10:51
@Aleksandr Thank you very much for your superb guidance. I think i have got the point what you were trying to say. I have successfully passed the `List` to the `` tag by using `dispatcher'. Thanks allot once again. — Pravin Varpe, May 05 '14 at 11:27
You are welcome. You can add your solution as an answer for future visitors. — Aleksandr M, May 05 '14 at 11:29
Yes Sure. But i will first implement it perfectly in my code by checking all the possible conditions with all pros & cons. Then will post the answer. — Pravin Varpe, May 05 '14 at 11:34

Pravin Varpe · Accepted Answer · 2014-05-06T06:28:09.253

On discussion with @Aleksandr I found the Answer. I am posting it here so that any one facing same problem can get a help form it.

To <s:iterator> tag we can not pass JSON object & it's not at all needed. What I had to achieve is to make a ajax call & pass a result to the <s:iterator>.

So no need to use a Struts2 json plugin. Simply use dispatcher which is default result type of action in Struts2 which returns html. Simple steps are

Create separate JSP page say List.jsp which will contain <s:iterator> tag to which we will pass the result(i.e List<myModel> in my case).

Give this List.jsp as a result page of our action as show below.

<s:action name="myAction" class="package.MyClass">
    <result name = "success">List.jsp</result>
</s:action>

So on making ajax call we will get List.jsp(i.e html) as a response. Simply add this response data to the any div you want.

That's it.

score 0 · Answer 2 · answered Sep 18 '14 at 09:26

First of all, you need to get "mylist" Object then you need to iterate through "myList" and then again use JsonObject iterator to get key-value pairs.

<s:iterator value="test.get('myList')" var="listJsonArray">
    <s:iterator value="listJsonArray" var="row">  
        <s:iterator value="row" var="jsonObject" > 
            <s:property/>
        </s:iterator> 
    </s:iterator> 
</s:iterator>

How to pass JSON object to Struts2 tag

2 Answers2