Dynamic IFRAME

[Sam Gardner]

Hey Guys,

I've been working on this IFRAME for a couple of days now, and I'm to the point where things are almost working. I can get the page that the IFRAME uses as its source to get the right request parameter from my dropdown box, so I should be able to view my SQL table alright.

The problem is, I don't want anything displayed in the IFRAME before the user selects something on the page that the IFRAME is on.

My structure is:

SurveyEdit.jsp has a dropdown which targets an IFRAME using DynamicSurvey.jsp.

What I'd like is for the IFRAME to show nothing before the user selects something from the dropdown. I've tried sticking an if/else statement in the DynamicSurvey.jsp, but I just get null pointers when I use:

if (request.getParameter("survey").equals(null))
{
out.println("Survey Form");
}
else
{
//code to create HTML SQL table
}

since the request parameter "survey" hasn't been created yet when the DynamicSurvey.jsp page is first called.

Any ideas?

Thanks,

Sam

[Ben Souther]

Originally posted by Sam Gardner:
but I just get null pointers when I use:

if (request.getParameter("survey").equals(null))
...

[/CODE]

You can not call a method on a null object (including the equals method).
Use the '==' operator.

if(null == request.getParameter("survey"))...

[Sam Gardner]

hehe. whoops. stupid school drilled the .equals into my head so much i forgot how it actually works.

thanks!