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form validation: go back to partly-filled form

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Mar 16.2006

Hi Gurus

If one input has data and another doesn’t, I want to ‘redirect’ back to the form. The code I know about is

[code=php]if (($_POST[‘eletter’]==-1) and (!$_POST[‘EAddress’])) {
echo “<meta http-equiv=”refresh” Content=”0;URL=signup.php”>”;
exit(‘Email address is required if you want to receive email updates…’);
}[/code]

but it reloads the page. I want to just go back in history, so that the data they entered is still there…

I was thinking about just printing a message on the page that processes the form, that says to hit the Back button to fill in the missing data, but I don’t know if I like that. Recommendations?

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PHP

3 Comments(s) ↴

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@crh3675Mar 16.2006 — [code=php]

if (($_POST['eletter']==-1) and (!$_POST['EAddress'])) {
exit("Email address is required if you want to receive email updates...<script type="text/javascript">setTimeout("window.history.go(-1)",2000);</script>");
}
[/code]
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@SheldonMar 16.2006 — or use sessions

to store the post data and then to populate the form feilds if you need to go back.

Making a multi page form easy, and when the form is submitted/finished use session unset to delete all the sessions that you set during submitting the form.

You also can leave one sesion var set to check for before submitting the form to stop multiple submissions
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@strBeanauthorMar 16.2006 — Thanks for the ideas.

I've started reworking this, and I'm using Sheldon's idea. The approach I'm taking is to use an include file, to keep the code on my main page a little simpler.

Question: When I require a file in a page that already has session_start() at the top of it, I'm assuming the $_SESSION array values are available to the code in the include file too, right?
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