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Calling servlet onchange event

Posted on 2004-08-10
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Last Modified: 2007-12-19
Hi experts,
I am creating a form in JSP, that has different dropdown boxes. For few boxes when we select certain option new input fields appear on screen for example- If from a drop down box that has options:Name, Age,Address, etc., say I select address option then 5 new input fields should appear on screen, i.e. add1, add2, city, state, zip. Now if I select the Name only two fields should appear i.e. First Name, and Last Name. and this time all adress fields should disappear.
Logic is simple, when we select option call servlet and set some value and reload the JSP with the new fields depending on the set value. Now I have done it, but the problem is when I change option and try to call servlet, it does not work.
<tr><td>Option</td>
<td><select name="CHECK" onchange="SERVLET">
      <option value="1">1</option>
      <option value="2">2</option>
</select></td></tr>

Anyone has any idea how to call servlet within the page without submitting the form.
Thanks
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Question by:raj3060
7 Comments
 
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Accepted Solution

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sompol_kiatkamolchai earned 50 total points
ID: 11768903
You can not call servlet directly from javascript.
you have to create hidden from and call submit. here is an example

<html>
<form name="form1" action="SERVLET" method="POST">
<select name="CHECK" onchange="document.form1.submit();">
     <option value="1">1</option>
     <option value="2">2</option>
</select>
</form>
</form>
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Expert Comment

by:sompol_kiatkamolchai
ID: 11768907
sorry.
>>you have to create hidden from and call submit. here is an example
you have to create form and call submit. here is an example
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Expert Comment

by:ss_p
ID: 11771710
you can call a servlet using a form with its action and method(POST or GET)
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LVL 11

Author Comment

by:raj3060
ID: 11772862
Hi Sompol,
It works, but I wanna know how to create a hidden form, right now I used the main form and it works.
--Raj
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Expert Comment

by:ss_p
ID: 11773661
add the

style="display:'none';" attribute in form field

i think then it should work

prasannaa
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LVL 11

Expert Comment

by:sompol_kiatkamolchai
ID: 11790032
raj3060,

It's not a hidden from. I type wrong. please see in the second comment :)
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LVL 1

Expert Comment

by:umangjoshi
ID: 11799268
sompol_kiatkamolchai  is right, you can write the code as follows

<select name="CHECK" onchange="location.href = 'hrrp://www.myweb.com/servlets/myservlet';">

With parameters
<select name="CHECK" onchange="location.href = 'hrrp://www.myweb.com/servlets/myservlet?para1=value1¶2=value2';">

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