Thanks. I am going to try this out and let you know.
Satish
At 11:10 AM 3/5/99 -0500, you wrote:
>For the first scenario I mentioned (using JavaScript to validate your
>form), you could have a page that looks like:
>
><FORM NAME=LoginForm ACTION=TheServletToSendValidDataTo METHOD=post>
> <INPUT TYPE=TEXT NAME=UserName VALUE="">
> <INPUT TYPE=PASSWORD NAME=Password VALUE="">
> <INPUT TYPE=BUTTON VALUE=Login onClick="validateInput();">
></FORM>
>
><SCRIPT LANGUAGE=JavaScript>
> function validateInput()
> { if (fieldIsEmpty(LoginForm.UserName))
> { alert("Please enter your user name.");
> }else if (fieldIsEmpty(LoginForm.Password))
> { alert("Please enter your password.");
> }else
> { LoginForm.submit();
> }
> }
>
> function fieldIsEmpty(whichField)
> { if (whichField == "")
> { return true;
> }else
> { return false;
> }
> }
></SCRIPT>
>
>Of course your JavaScript validation can be more more complicated -- I
>kept it simple for the sake of example.
>
>For the second scenario (having the validation servlet reload the form
>with the entered data and pop up an alert message), try something like
>this:
>
>(This example assumes the form is in a static HTML page)
>When the validation servlet detects invalid data, redirect to the form,
>attaching all the form data to the URL so you get something like:
>UserLogin.html?UserName=John%20Doe&Password=&errorMessage=Please%20enter
>%20your%20password.
>Notice I've also added a value called errorMessage. In the HTML file,
>use JavaScript to parse the values and do like:
>document.writeln("<INPUT TYPE=TEXT NAME=UserName VALUE=\"" + userName +
>"\">
>At the end, do a test like
>if (errorMessage != "")
>{ alert(errorMessage);
>}
>
>If the form is in a servlet, it's pretty much the same as above except
>you can obviously populate the form without using JavaScript. At the
>end of the output, supply that alert(errorMessage); JavaScript if
>errorMessage is anything but empty.
>
> I can't provide any more detailed code than that right now, but
>these examples should get you on your way. If you choose the first
>method to solve your problem, know that any book on JavaScript will show
>you how to validate data in a form before submitting it. The second
>method, if the form is in a servlet, is plain ol' servlet work with the
>addition of the errorMessage JavaScript alert being added to the HTML
>page. If the form is in a static page, you'll need JavaScript to parse
>the query string, a topic that I went into detail about a couple of
>weeks ago in a discussion about passing values from servlets to HTML
>pages. Check the archives if you want to know more about that,
>including sample code.
>
>
>Hope this all helps you!
>
>Russell Montgomery
>Digital Renaissance
>
>
>> -----Original Message-----
>> From: Satish Talim [SMTP:[EMAIL PROTECTED]]
>> Sent: Tuesday, March 02, 1999 7:03 PM
>> To: Russell Montgomery
>> Subject: Re: Retaining current page after post?
>>
>> Hi,
>>
>> Any sample code to help with concepts you mentioned below.
>>
>> Thanks,
>>
>> Satish
>>
>>
>> At 10:49 AM 3/4/99 -0500, you wrote:
>> > Depending on what kind of validation you do, you may be able to
>> do
>> >it within the page itself using JavaScript. When the user clicks the
>> >Submit button, check that required fields have been filled in, that
>> >numeric fields contain numbers, etc. If validation passes, submit to
>> a
>> >servlet, otherwise throw up an alert box telling the user what's
>> wrong.
>> >
>> > Another option is to do the validation in the servlet the form
>> is
>> >submitted to, and if things don't meet your requirements, submit the
>> >values that were passed to the validation servlet back to the form
>> and
>> >have the form populate itself with these values. Include a value
>> such
>> >as errorMessage which, if not null, causes that form to display an
>> alert
>> >box containing the message.
>> >
>> >
>> >Russell Montgomery
>> >Digital Renaissance
>> >
>
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