form:checkboxes problem - onSubmit doesnt start

**worker** · Nov 18th, 2008, 09:01 AM

I use form:checkboxes tag, it display properly. If I don't choose any option, submit works fine, but when I select element from the checkboxes, the submit doesnt work, it loads the same page and method onSubmit don't start. Without form:checkboxes it work correct.

I was using form:checkboxes and it was working fine, for example for enumerations. But it doesnt work for Set of complex objects.

This is my case:

Code:

<spring:bind path="command.selectedMembers">
<form:checkboxes path="command.selectedMembers" items="${friends}" itemLabel="fullName" delimiter="<br/>"/>
</spring:bind>

**worker** · Nov 18th, 2008, 11:26 AM

again, i removed everything, left only this on page:

HTML Code:

<body>
<form:form method="post">
<form:checkboxes path="selectedMembers" items="${friends}"/>

<input type="submit" value="save" />
</form:form>
</body>

for controller:

Code:

<property name="commandClass">
<value>com.thell.form.InviteToEventForm</value>
</property>

command class:

Code:

public class InviteToEventForm {

	private String emails;
	
	private Set<Friend> selectedMembers;

	public String getEmails() {
		return emails;
	}

	public void setEmails(String emails) {
		this.emails = emails;
	}

	public Set<Friend> getSelectedMembers() {
		return selectedMembers;
	}

	public void setSelectedMembers(Set<Friend> selectedMembers) {
		this.selectedMembers = selectedMembers;
	}

}

It should work, but it does not work. When I select any checkbox (in set I have only one, but it should not matter).
So when I select element, submit does not work - I am forwarded back to the same page through :

Code:

@Override
	protected Object formBackingObject(HttpServletRequest request)...

and when element from checkbox is not selected, submit method works!!!

Code:

	@Override
	protected ModelAndView onSubmit(HttpServletRequest request,
			HttpServletResponse response, Object command, BindException errors)
			throws Exception {

What is the problem?

**worker** · Nov 18th, 2008, 12:41 PM

I have changed Set to Array, because it is in Spring documentation about checkboxes tag:

You pass in an Array, a List or a Map containing the available options in the "items" property.

So the Set wasn't mentioned...but still the same results.
I am going crazy

**worker** · Nov 19th, 2008, 10:26 AM

OK, onSubmit() didn't start because it was error message from checkboxes, but I didn't display it.

And the solution was to add:

Code:

   	binder.registerCustomEditor(Set.class, "selectedMembers",
    			new CustomCollectionEditor(Set.class){
    		protected Object convertElement(Object element){
    			Integer id = new Integer((String) element);
    			Friend friend = new Friend();
    			friend.setFriendId(id);
    			return friend;
    		}
    		}

in controller, inside method:

Code:

    protected void initBinder(

I thought that I don't need to do such things and it will be done magically automatically.
So now I know that it is not so automatic.

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