Question

I have a table which one column is button, how can I send ${user.key} the to the servlet when I click over the button?

<form action="InstitutionManagementServlet" method="post" >   
<c:forEach items="${requestScope.AllUsers}" var="user" varStatus="loop">
      <tr>
          <td class="numberWidth">${loop.index + 1}</td>

          <td class="nameWidth" id="${user.key}">${user.value}</td>
          <td><input type="submit" name="Deactivate" value="Deactivate"/></td>
      </tr>
</c:forEach>
</form>

Answer 1

There are two approaches for this.

1. Pass it as button value (and use <button> instead of <input> so that you can give it a label)

   <form action="InstitutionManagementServlet" method="post">   
       <c:forEach items="${requestScope.AllUsers}" var="user" varStatus="loop">
           <tr>
               <td class="numberWidth">${loop.index + 1}</td>
               <td class="nameWidth" id="${user.key}">${user.value}</td>
               <td><button type="submit" name="Deactivate" value="${user.key}">Deactivate</button></td>
           </tr>
       </c:forEach>
   </form>
   

   with

   String key = request.getParameter("Deactivate");
   // ...
   

   ---

2. Or, put each button in its own form with the key as a hidden field.

   <c:forEach items="${requestScope.AllUsers}" var="user" varStatus="loop">
       <tr>
           <td class="numberWidth">${loop.index + 1}</td>
           <td class="nameWidth" id="${user.key}">${user.value}</td>
           <td>
               <form action="InstitutionManagementServlet" method="post">
                   <input type="submit" name="Deactivate" value="Deactivate" />
                   <input type="hidden" name="key" value="${user.key}" />
               </form>
           </td>
       </tr>
   </c:forEach>
   

   with

   String key = request.getParameter("key");
   // ...