sending a Collection from JSP to Servlet

[Ravi Kiran Va]

<%

ArrayList al = new ArrayList();
al.add("a");
al.add("b");
al.add("c");
%>
<input type=hidden name="name" value="al"/>

Can i send this to a servlet ??

[jack wenttohill]

  
 ArrayList al = new ArrayList();
 al.add("1");
 al.add("2");
 al.add("3");
request.setAttribute("myList", al );

Then in servlet use

   
 ArrayList al = ( ArrayList ) request.getAttribute("myList");

And please study the scope of jsp/servlet you will better understand more.

[Ravi Kiran Va]

This is not possible . Is this possible with getParameter()??

[Balu Sadhasivam]

Can i send this to a servlet ??

yes you can , but shouldn't. What you achieve by calling servlet from JSP. ( it should be other way around)

[Ulf Dittmer]

What do you mean by "send"? A JSP generates HTML which is then sent to the browser. Where does a servlet enter the picture?

[Ravi Kiran Va]

sorry for the confusion , i thought tha question is clear :


The question is :

JSP is submitting form data :

<%

ArrayList al = new ArrayList();
al.add("a");
al.add("b");
al.add("c");
%>

<form method="post" action="/MySevlet">
<input type=hidden name="name" value="al"/>

</form>

[Ulf Dittmer]

Now it's clear. You can't use Java objects in HTML forms; you'll need to add all list items individually as hidden form fields.

[Ravi Kiran Va]

Thank you ulf ,

I just wanted to try but this is not even compiling "

 ArrayList mylist = ( ArrayList ) request.getParameter("al");

Then how to send a java array to servlet from jsp ?

[Ulf Dittmer]

By doing what I suggested before.

Check the javadocs of HttpServletRequest for the reason why you're getting a compiler error.

[Mohamed Inayath]

Yes it will give compilation error.
To be precise a Class Cast Exception.

getParameter() api returns String and you are trying to cast with ArrayList.

Regarding to the question, one cannot pass the Array object as part of input as it will take only Strings

[Ravi Kiran Va]

Thank you ulf and Mohamed for the explanations .

Please tell me

<SCRIPT LANGUAGE JAVASCRIPT>

 function validate()
 {
 var x= new Array(a.length)

 for ( i =0; i<x.length; i++) 
{
 x[i]== 10 )

</SCRIPT>

How can i send this Array to a Servlet .

[Skanda Raman]

You can comma separate array and send it to servlet using AJAX..

[Ravi Kiran Va]

Other than that is there any other way ?