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#1
July 2nd, 2002, 10:57 AM
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request.getParameter() in same page as form .. ?
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
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#2
July 2nd, 2002, 04:50 PM
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You must first check if the parameter exists. I see this mistake even by pros.
Code:
String p = request.getParameter("p");
if (p != null) {
. . .
}
You can make some external class for processing this, too. Even better if you can define a tag handler to handle that situation. Geary's 'Advanced Java ServerPages' has a pretty good discussion about custom tags.
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#3
July 2nd, 2002, 04:50 PM
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You must first check if the parameter exists. I see this mistake even by pros.
Code:
String p = request.getParameter("p");
if (p != null) {
. . .
}
You can make some external class for processing this, too. Even better if you can define a tag handler to handle that situation. Geary's 'Advanced Java ServerPages' has a pretty good discussion about custom tags.
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