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request.getParameter() from same page as HTML FORM

 
sarim raza
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posted 22 years ago
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I have a jsp page with a form. form contains a textfield, once the user submits the form, i want jsp scriptlet to get the value of the user input and carry out processing on it within the same page and give a result.
problem is the first time the page is loaded, there is an error in the request.getParameter() statement since no form has yet been submitted i guess ....
if i use another page ... it works ... but i want to display the information in the same page ...
thanks
 
Bosun Bello
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posted 22 years ago
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Why don't you check the parameter for null and spaces first.
if(request.getParameter("yourParameter") != null && !request.getParameter("yourParameter").equals(""))
do whatever...

Bosun (SCJP, SCWCD).
So much trouble in the world -- Bob Marley

 
Mark Fletcher
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posted 22 years ago
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Hi,
I found that this bit of code works (see example below).
Let us know how you get on.
Cheers!
Mark

Mark Fletcher - http://www.markfletcher.org/blog
I had some Java certs, but they're too old now...

 
sarim raza
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posted 22 years ago
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THANKS A LOT !!!
thanks mark and bosun ..
Mark your code works, you guys are experts as usual ... I remember from my time here when preparting for SCJP2 !!
 
yoga babu
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posted 18 years ago
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hai,


According to your program,once we submit the data ,the value in the text field is disappering.how to keep this value as such even after submission of the data.

Regards
Babu
 
Muhammad Saifuddin
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posted 18 years ago
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Originally posted by yoga babu:


the value in the text field is disappering.how to keep this value as such even after submission of the data.



Hi Babu,

hope you will get your solution here.. you just need to do that to bind your string variable with value in textfield by checking null like what Bosun Bello did for you in above code..

your code would be like this..



hope this helps..
[ December 14, 2006: Message edited by: Saif uddin ]

Saifuddin..
[Blog][Linkedin] How To Ask Questions On JavaRanch My OpenSource

 
Dhanya Palanisamy
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posted 18 years ago
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Hi Sarim,

You can use this also

if (request.getParameter("Submit")!=null) so that your page does not show any error for the first time
 
Muhammad Saifuddin
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Originally posted by Dhanya Palanisamy:
Hi Sarim,

You can use this also

if (request.getParameter("Submit")!=null) so that your page does not show any error for the first time



Why you check the submit value ?

I think we don't need to check the Button value in this condition. The error will not occur on the submit(button) value because i retrieved textField value in request.getParameter("MyText") so i already applied that (if condition) in above post to checking the null value.. for the first time loading.

Saifuddin..
[Blog][Linkedin] How To Ask Questions On JavaRanch My OpenSource

 
Dhanya Palanisamy
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posted 18 years ago
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Hi Saif,

if (request.getParameter("Submit") != null) makes sure the page has already been submitted. So placing getParameter() for other fields inside this condition will not give you any errors before the page is submitted.

If you have one or two fields you can check for null values as you suggested but it will be difficult if you have more fields.

Hope i explained properly.
 
yoga babu
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posted 18 years ago
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[Bear edit: thread hi-jack removed. Please start your own questions in a new topic.]
[ December 15, 2006: Message edited by: Bear Bibeault ]
 
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