Get <select> value in servlet

Question

I have:

<select id="isTitles"> <option value="true">enable</option> <option value="false">disable</option> </select> 

on my index.jsp. And I would like to know what was chosen:

 response.getWriter().write( "User chose: " + request.getAttribute( "isTitles" ) ); 

But I have a "User selected: null" ... = (

Answer 1

Change your HTML code to:

 <select id="isTitles" name="isTitles" > 

The id attribute of the select tag is mainly used to use the DOM, and the name attribute is used to specify the form data key.

And then use request.getParameter("isTitles") , your will get the correct value. getParameter designed to retrieve parameters from form data and URL query string. For now, getAttribute designed to transfer data through a process chain throughout the request life cycle.

Answer 2

You need to pass the name of your attribute as name="isTitles"

 <select name="isTitles"> </select> 

request.getParameter() understands the parameter name

Answer 3

change this value request.getAttribute( "isTitles" ) to request.getParameter("isTitles" )

There is also no name for the select box, so you must also give it a name

 <select id="isTitles" name="isTitles"> <option value="true">enable</option> <option value="false">disable</option> </select> response.getWriter().write( "User chose: " + request.getParameter("isTitles" ) ); 

Answer 4

Using

 request.getParameter("isTitles") 

and specify the name attribute for your selection box

 <select id="isTitles" name="isTitles" >