Getting ArrayList object from servlet and storing it as javascript array variable using AJAX

Question

I have some arrayList objects as my servlet request attribute. I want to get it into my javascript variable which is in a JSP page. I tried like this.

abc.jsp

<script>
var myList=<% (ArrayList)request.getParameter("list_name") %>;

//do use of myList.....

</script>

But this is not working. I am not getting the data.

Then tried with

var myList=<% =(ArrayList)request.getParameter("list_name") %>;

Didnt work!!

Thanks in advance..

Thejsp variable should be declared as <%= ArrayList myList=(ArrayList)request.getParameter("list_name") %>. — palAlaa
– palAlaa, Commented Jan 13, 2011 at 12:38
Certainly i have declared my variable like this as this is the usual way of declaring jsp variable as you are saying. <%= ArrayList myList=(ArrayList)request.getParameter("list_name") %>. — pkj
– pkj, Commented Jan 16, 2011 at 4:06
My problem is now how i can use that jsp variable in my javascript, this list is having thousands of records. — pkj
– pkj, Commented Jan 16, 2011 at 4:08

BalusC · Accepted Answer · 2011-01-13 12:54:37Z

1

Since the toString() method of ArrayList would accidentally give the desired result, then you can simply use var myList = ${list_name};. But the result of your 2nd snippet should also be working, so I would assume that you don't have the list set as a request attribute.

Make sure you've:

called request.setAttribute("list_name", yourlist); in the servlet
used forward, rather than redirect to the jsp.

You can also try [${fn:join(list_name, ',')}]

or

var myList = new Array();
<c:forEach items="${list_name}" var="item" varStatus="loop">
   myList[${loop.index}] = "${item}";
</c:forEach>

edited Jan 13, 2011 at 12:54

BalusC

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answered Jan 13, 2011 at 12:40

Bozho

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