On 20-06-2012 15:55, Tim Dunphy wrote:
Hello list,
I just wanted to bounce a slight issue that I'm having off you
regarding self referencing a php script. Moving from the
'sendemail.htm' page where a form is used to the 'sendemail.php' page
that is in the form action works fine! But if you reload the page, the
php part of the equation loses track of it's $_POST[] variables, and
you see the following errors in the output of the php page:
Notice: Undefined index: subject in
/Library/WebServer/Documents/examples/ch03/final/makemeelvis/sendemail.php
on line 19
Notice: Undefined index: elvismail in
/Library/WebServer/Documents/examples/ch03/final/makemeelvis/sendemail.php
This is the original form from the sendemail.html page:
<form method="post" action="sendemail.php">
<label for="subject">Subject of email:</label><br />
<input id="subject" name="subject" type="text" size="30" /><br />
<label for="elvismail">Body of email:</label><br />
<textarea id="elvismail" name="elvismail" rows="8"
cols="40"></textarea><br />
<input type="submit" name="Submit" value="Submit" />
</form>
The reason you're seeing this behaviour is actually quite simple. POST
data is only available when a POST action has been performed. Most
actions are not post, but usually GETs.
Due to you specifying 'method="post"'in your HTML form, pressing the
submit button sends a POST request to your PHP script. When you refresh
the page, your browser sends a GET request, without any data whatsoever
(because it doesn't submit the form in any way). Some browsers are smart
and actually ask you if you want to resubmit the page, but you shouldn't
count on it.
So... how to resolve your problem? Well, you can prefill a form with the
data submitted. That way, the user can resubmit the form without having
to fully refill it him (or her)self. This is done by passing the data
for each element in the value-attribute (for input), a
selected-attribute (for select) or as the content (for textarea):
<input type="text" name="a" /> will just give an empty input element.
But <input type="text" name="a" value="<?php echo (isset($_POST['a']) ?
$a : '');?>" /> will show the value of the previously posted request, if
any. Otherwise, it will just be empty.
<input name="something" type="whatever" value="data">
<select name="something">
<option value="something" selected="selected">
<option value="something not selected">
</select>
<textarea name="something">data goes here</textarea>
Hope this helps.
- Tul
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