how to disable buttons based on a condition in jsp?

Question

how can I disable a button by checking a condition in my jsp? If true,then the button is enabled,if false,then the button is disabled. The condition would be checking the value of a variable. I know how to disable a button using javascript, but to use it along with the condition in jsp is what I'm not able to figure out. Is it at all possible?

Answer 1

Try using JSTL construction like this:

<input type="button" <c:if test="${variable == false}"><c:out value="disabled='disabled'"/></c:if>">

For more examples see http://www.ibm.com/developerworks/java/library/j-jstl0211/index.html

Answer 2

Or simply you could do it using el directly like this:

<input type="button" ${ condition ? 'disabled="disabled"' : ''}/>

As an example:

<input type="button" ${ someVariable eq 5  ? 'disabled="disabled"' : ''}/>

Answer 3

My approach would be something like this:

 <c:choose>
    <c:when test="${condition == true}">
      <input type="button" disabled="disabled"/>
    </c:when>
    <c:otherwise>
      <input type="button" />
    </c:otherwise>
 </c:choose>