CODEWITHSUNDEEP
javajspservletsjstl
Harshana
Harshana

Reputation: 7647

Access jstl variable in servlet

Im populating customer data by iterating a customer list as following in the jsp.

<form action="CustomerUpdate" method="post">
<c:forEach var="listItems" items="${customers}">          
   <label> First Name: </label><c:out value="${listItems.fname}" />  
   <label> Last Name: </label><c:out value="${listItems.lname}" />
   <label> Address: </label><c:out value="${listItems.address}" /> &nbsp;
   <input type="submit" value="Edit" name="edit">
   <input type="submit" value="Delete" name="delete"><br />     
</c:forEach> 
</form>

Now in the action either edit or delete each record i want to track which customer needs to be edit/delete. So in servlet how can i access the customer object which is in var listItems. If its not possible do i need to have hidden input variables with values and access them using getParameter in servlet?

Upvotes: 1

Views: 4609

Answers (2)

mykey
mykey

Reputation: 575

in the servlet check the which button was clicked as:

if (request.getParameter("action") != null) //if action is not null
        {
            String action = request.getParameter("action");
String id = request.getParameter("id");

            if (action.equals("edit")) //edit button clicked
            {
               //do your work here
            }
            else if (action.equals("delete")) //delete button clicked
            {
                //your work here
            }
}

Upvotes: 0

dash1e
dash1e

Reputation: 7807

This is only a simple example on how to do it. Change your code in this way:

<c:forEach var="listItems" items="${customers}">          
  <form action="CustomerUpdate" method="post">
    <input type="hidden" value="${listItems.id}" name="id">
    <label> First Name: </label><c:out value="${listItems.fname}" />  
    <label> Last Name: </label><c:out value="${listItems.lname}" />
    <label> Address: </label><c:out value="${listItems.address}" /> &nbsp;
    <input type="submit" value="Edit" name="action">
    <input type="submit" value="Delete" name="action"><br />     
  </form>
</c:forEach>

Update

Create a form element for every row, and put for every row an hidden field with the id. So when you press that button you will receive in the request a value that make you able to detect the row. In this way:

String id = request.getParameter("id");
String action = request.getParameter("action");

Now you know the id and the action type (edit or delete).

Alternative solution

Do not use the form and submit to call your action, but use a direct link.

<c:forEach var="listItems" items="${customers}">          
  <input type="hidden" value="" name="id">
  <label> First Name: </label><c:out value="${listItems.fname}" />  
  <label> Last Name: </label><c:out value="${listItems.lname}" />
  <label> Address: </label><c:out value="${listItems.address}" /> &nbsp;
  <button onclick="window.location.href='CustomerUpdate?action=edit&id=${listItems.id}'">Edit</button>
  <button onclick="window.location.href='CustomerUpdate?action=delete&id=${listItems.id}'">Delete</button>
</c:forEach>

Upvotes: 3

Related Questions