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Re: Not understanding HTML form [message #169432 is a reply to message #169429]

Sun, 12 September 2010 18:24

Jerry Stuckle
Messages: 2598
Registered: September 2010

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Senior Member

On 9/12/2010 2:06 PM, MikeB wrote:
> I have a question about form submission in PHP (Perhaps more a HTML
> question, but then I don't know).
>
> Please look at the attached sample code. It is a mish-mash of things,
> but this is what I want to know:
>
> When the form initially displays, since the "action" field from the
> form is not set, the PHP code performs the "else" part of the PHP
> code.
>
> Then when I type something into the "action' field, the isset test
> evaluates to true and the "if" portion is executed. However the value
> of the action field is not carried over, since the form does not have
> a "value" clause for that input field.
>
> However, on a 3rd iteration, without typing anything into any field,
> the isset still evaluates to true, although the $_POST variable for
> "action' shows a null field. How can I then recognize that that field
> is in fact not set? or is it set with nulls or what is going on here?
>

A variable containing an empty string (i.e. '') is still set. It is not
a "null field" - it is a string containing no characters.

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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
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[Message index]

		Not understanding HTML form By: MikeB on Sun, 12 September 2010 18:06
		Re: Not understanding HTML form By: Marious Barrier on Sun, 12 September 2010 18:17
		Re: Not understanding HTML form By: MikeB on Sun, 12 September 2010 18:25
		Re: Not understanding HTML form By: Marious Barrier on Sun, 12 September 2010 18:52
		Re: Not understanding HTML form By: Piyush Gupta on Mon, 13 September 2010 10:44
		Re: Not understanding HTML form By: Jerry Stuckle on Sun, 12 September 2010 18:24

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