Accessing servlet from jsp

[itgaurav198]

Hi,

I have one jsp and one servlet.

I am using a jsp in which i am entering some values like name, empid etc. and there is a dropdown list for location. I want when i select a particular location then a servlet is called in which i acess the values in an arraylist and uses
request.setAttribute,requestDispatcher and forward to pass these values to the first jsp.

Another dropdown on the jsp is populated using the values returned from servlet. Currently the servlet is called when the form is submitted. but i want it to be called onchange of location dropdown.

Another problem is that all the entered values before calling the servlet get reset to their initial values while these should remain as it was before calling the servlet.
How these problems can be solved?

Thanx

[Ferris]

hi

for your 1st problem,i have 2 sullutions.

1:using XMLHttpRequest(javascript) to call your servlet when your dropdown list is changed.(popular way)

2:you can reload your page by adding a new parameter in URL when list is changed.the jsp code in first.jsp will build a new dropdown according to the parameter.
for example:

open first.jsp ->
dropdown onchanged ->
open first.jsp?param=listvalue ->
listvalue -> jsp -> DB -> dropdown


for your 2nd problem:
if you use method 1 I give you,your entered value will not miss.
if you use method 2 ,you need to use jsp to rewrite the posted data into your input.


hope it helps.

[itgaurav198]

hi

for your 1st problem,i have 2 sullutions.

1:using XMLHttpRequest(javascript) to call your servlet when your dropdown list is changed.(popular way)

2:you can reload your page by adding a new parameter in URL when list is changed.the jsp code in first.jsp will build a new dropdown according to the parameter.
for example:

open first.jsp ->
dropdown onchanged ->
open first.jsp?param=listvalue ->
listvalue -> jsp -> DB -> dropdown


for your 2nd problem:
if you use method 1 I give you,your entered value will not miss.
if you use method 2 ,you need to use jsp to rewrite the posted data into your input.


hope it helps.

Can u please send me some sample code?

[Ferris]

hi

I'm sorry I have no sample code.I have told you how to do,so,you can google the code you want.

[acoder]

Can u please send me some sample code?

See the Ajax example in the Articles section.