Read NULL value parameters from POST and GET in classic ASP

**bendecko** · May 20, 2011 07:00

Hi

I'm try to achieve in classic asp what has been done here in ASP.NET

http://stackoverflow.com/questions/4...ring-parameter

So if i have a page question.asp

<form action="result.asp" method="POST">
Name: <input type="Text" name="name" maxlength="30"><BR>
Age: <input type="Text" name="age" maxlength="10"><BR>
Sex: <input type="Text" name="Sex" maxlength="10"><BR>
<input type="Submit" name="submit" value="submit"><BR>
</form>

And nothing is input in e.g. 'Sex' text box I stil need to know that it was sent. e.g. name=karl&age=39&sex=

Thanks

**gidday** · May 21, 2011 23:03

Hi bendecko

So maybe something like

If Request("sex") = "" Then
'do something because sex is empty
Else
'do something else because sex is androgynous
End If

**siteguru** · May 22, 2011 07:38

Consider also the IsEmpty() and IsNull() functions.

**bendecko** · May 22, 2011 12:37

Thanks guys,

Sorry my example was poor.

As in the .net query, I don't know what parameters are on the submitting form so I can't test e.g sex="" or null or whatever.

I need to detect the parameters from the querystring that are null or have no value without knowledge of the form post variables in advance.

Thanks

**gidday** · May 23, 2011 01:28

Try

For each x in Request.Form
Response.Write("<br>" & x & " = " & Request.Querystring(x))
Next

**bendecko** · May 23, 2011 01:42

Thanks gidday, unfortunately, no it doesn't work.

If a form item e.g. text box is empty it doesn't appear in the list.

**gidday** · May 23, 2011 02:06

Can you post your code for your form?

**siteguru** · May 23, 2011 03:56

What if you replace .Form with .QueryString?

**gidday** · May 23, 2011 04:08

Whoops. My bad.

**bendecko** · May 31, 2011 06:29

<html>
<body><%
For each x in Request.Form
Response.Write("<br>" & x & " = " & Request.QueryString(x))
Next
%>

<form action="sitepointdemo.asp" method="post">
<input name="demo" type="text" />
<input name="radio" type="radio" value="home">
<input name="radio" type="radio" value="away">

<input name="alive" type="checkbox" value="yes">
<input name="submit" type="submit" /></form>

</body>
</html>

If I don't tick e.g. the checkbox it doesn't show up in the posted values.

Thanks for your help!

Bendecko

**siteguru** · May 31, 2011 13:27

Checkboxes that are not checked are not sent with the form, so ASP cannot see them. If you know they exist in the form then you can test for them explicitly, otherwise you're stuck.

**itHighway** · Jun 1, 2011 08:33

Change following line

to

**siteguru** · Jun 1, 2011 11:15

If method is POST use Request.Form

If method is GET use Request.Querystring

But either way, if a checkbox is not checked then it is not sent with the form - period.

**bendecko** · Jun 3, 2011 00:40

Yeah it seems the browser doesn't bother sending checkboxes if they are not checked. So nothing can be done about that on the asp side.

Thanks for your help guys.

The work around is to use javascript. Or to add a hidden field with the same name set to 'OFF' or whatever negative you using.

The POST results then are either checkbox=OFF (for no check box tick) or checkbox=OFF, ON which you can read for.

Thanks

Bendecko

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