List of checkboxes and Array/ArrayList data binding not working.

[Sagar Kale]

Hi,

I have a form in which I show list of empId, first name and last name in table form. I want to show checkbox in front of every row and I have Delete button, which when clicked should delete all the employees which are checked.
I tried a lot to bind list of checkboxes to array or ArrayList of empIds. But it does not properly bind it.

<form:form action="deleteEmps.htm" commandName="deleteEmpForm"  >

<table border="1">
 	<tr>
 		<td><input type="submit" value="Delete"></td>
 		<td>Emp Id</td>
 		<td>First Name</td>
 		<td>Last Name</td>
 		
 		
 	</tr>
 	
 	<c:forEach items="${empList}" var="emp" varStatus="empRow" >
 		<tr>
 			<td>
 <spring:bind  path="deleteEmpForm.empIds" ignoreNestedPath="true">
 <input type="checkbox" id="empIds" value="${emp.empId}" />
 </spring:bind> 
 </td>
 			<td><c:out value="${emp.empId}" /></td>
 			<td><c:out value="${emp.firstName}" /></td>
 			<td><c:out value="${emp.lastName}" /></td>
 
 			
 		</tr>
 	</c:forEach>
 
 
 
 </table>

</form:form>

public class DeleteEmpListForm implements java.io.Serializable{
	private ArrayList<Emp> empList = new ArrayList<Emp>(); // this is used only for displaying empid, firstName, lastName.
	private ArrayList<Long> empIds = new  ArrayList<Long>(); // this list is used to bind checkboxes.
	
	
	public ArrayList<Long> getEmpIds() {
		return empIds;
	}

	public void setEmpIds(ArrayList<Long> empIds) {
		this.empIds = empIds;
	}

	public ArrayList<Emp> getEmpList() {
		return empList;
	}

	public void setEmpList(ArrayList<Emp> empList) {
		this.empList = empList;
	}
	
//	public Long getEmpIds(int index) {
//		return empIds.get(index);
//	}
	public void setEmpIds(int index, Long value) {
		empIds.add(value);
	}

	
}

When I submit the form, in my form handler I get zero sized empIds list, even though I have checked few checkboxes.

I have tried <form:checkbox /> tag. It bindes, but the chckboxes which are not selected also get submitted with null values. In my code I ignore null, but the problem with tag is I could not find how to show unchecked checkboxes in my first display.

[Hong Anderson]

You should do something like the following:

<input type="checkbox" id="empIds[0]" value="${emp.empId}" />