using <html:iterate> to display an array in the array

[david arnold]

Hi,

The jsp file get an array groupA from session which has the structure like this:

   
String groupA[] = {element1, element2, groupB[]...}

String groupB[] = {name1, name2, name3...}

 

I want to display the elements of groupB[] in a table, in stead of using jsp script, I am wondering if I can use <html:iterate> to accomplish this?

Thanks for the help!

[Ankit Garg]

I think you need to post your code properly. The code that you gave won't compile as groupB is not declared when it is used in groupA. Also you can't fit a String[] into a String[]. You need to have a 2-d String array. Are you trying to say that you want to iterate over a 2 dimensional array like this

String[][] arr = {{"a","b"},{"c","d"}};

If yes, then I think you can easily do this in Struts 2 (I don't know about struts 1 and you have also not mentioned which version of struts you are using)...

[david arnold]

Thank you Ankit Garg. sorry i did not explain clearly, i am using struts 1.2.9. I have a ActionForm like the following:

  
public class groupForm extends ActionForm
{
	private String uid;
	private String userUID;
	private String name;
    ...............
	private String[] students;
	
	Get and Set method;
}

In Action class to display group and students in the group:

{...........
     groupForm[] allGroups = AccessServer.getGroups(user.getUserUID());
	 request.getSession().setAttribute("allGroups", allGroups);
	 .............
}

  

In JSP file, there is dropdown list which contains all group names and shows the first one. Now I want to add a table to display the student names in a group when user select a group
from a dropdown list. And user may move students to other table, then I need update the table in form and forward to Action. Could I use Struts <html:iterate> to do this? I know how to use <html:iterate> to display like uid, name, but do not know how to display students array.

For example, if I have 3 group A,B,C, how could I diplay student names in group B using html:iterate ?

Thanks.

[David Newton]

It's <logic:iterate>, not <html:iterate>. I'm not sure what the confusion is--the iterate tag docs describe it pretty well.

That said, using JSTL may be a better solution--it's recommended that when JSTL and Struts tag functionality overlap that JSTL is used. The Struts tags were written before JSTL existed.

[Lei Guoguo]

if you can use jstl tag, you can write like under code

<c:forEach items="${groupA[3] }" var="item" >
  <c:out value="${item }" />
</c:forEach>

if not

<%page.setAttribute("groupB", ((Object[])request.getAttribute("groupA"))[3]) %>
<logic:iterator />

[david arnold]

Thank you David and Lei!