Two dropdowns - need to indicate to server side code the specific dropdown

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posted 21 years ago

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Hello ,
I have two dropdowns in my JSP page
The problem is - I need to pass an indicator as to which dropdown has been changed

Both the dropdowns are in the same form
I would like to know - if its possible to pass an indicator through Javascript
that can be picked up in Java code

Thanks in advance ,
anagha
[ May 16, 2005: Message edited by: pendse anagha ]

William Brogden

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posted 21 years ago

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You are mixing up a lot of technologies here. In an HTML form, each SELECT input should have a unique name so you could simply compare the returned value with the value originally set as SELECTED.
Whether the HTML gets written by JSP or is a static page has nothing to do with it.
If you want JavaScript to watch form activities and make some report, you can do that with one or more hidden variables in the form. Hidden variables in forms appear as request parameters just like SELECT input variable.
Bill

Ben Souther

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posted 21 years ago

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This question would probably do better in the HTML/Javascript forum but here's one way:

<html>
  <head>
    <script>
      function update(obj){
        document.getElementById('changed').value = obj.name;
        document.someForm.submit();
      }
    </script>
  </head>
  <body>
    <h2>${param.changed}</h2>
    <form name="someForm" method="post">
      <input type="hidden" name="changed" id="changed" />
      <select name="day" onchange="update(this)">
        <option value="1">Monday</option>
        <option value="2">Tuesday</option>
        <option value="3">Wednesday</option>
        <option value="4">Thursday</option>
        <option value="5">Friday</option>
        <option value="6">Saturday</option>
        <option value="7">Sunday</option>
      </select>
      <select name="month" onchange="update(this)">
        <option value="1">January</option>
        <option value="2">February</option>
        <option value="3">March</option>
        <option value="4">April</option>
        <option value="5">May</option>
        <option value="6">June</option>
        <option value="7">July</option>
      </select>
    </form>
  </body>
</html>

You'll probably need to tweak it a bit to get it to work on older browsers.
[ May 16, 2005: Message edited by: Ben Souther ]

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