[SOLVED] Error on submitting information

[graham23s]

Hi Guys,

 

i have seen on a good few websites a neat style they do, say for example you leave out a required text field the input area turns red to show you, that its a required field, i normally grab all the POST data then if its empty say so, how is that achieved?

 

any advice would be great

 

cheers

 

Graham

[PHP_PhREEEk]

Javascript form validation

 

PhREEEk

[Psycho]

Well, JS validation is fine, but should not be relied upon since users can turn it off. Here is an example of how it can be done.

 

<?php

if (isset($_POST['submit'])) {
  $error = false;

  if ($_POST['name']=='') {
    $field_error['name'] = false;
    $error = true;
  }

  if ($_POST['email']=='') {
    $field_error['email'] = false;
    $error = true;
  }

  if (!$error) {
    //process form & redirect
  }

}

echo "<form>\n";
$color=($field_error['name']===false)?'#ff0000':'#000000';
echo "<input type=\"text\" name=\"name\" value=\"".$_POST['name']."\" style=\"background-color:$color\">\n";
$color=($field_error['email']===false)?'#ff0000':'#000000';
echo "<input type=\"text\" name=\"email\" value=\"".$_POST['email']."\" style=\"background-color:$color\">\n";
echo "<input type=\"submit\" value=\"true\" name=\"Submit\">\n";
echo "</form>\n";

?>

 

This is not tested, but you should get the idea. I just slapped this together, so I am sure there is a more efficient method.

[papaface]

Well, JS validation is fine, but should not be relied upon since users can turn it off. Here is an example of how it can be done.

 

<?php

if (isset($_POST['submit'])) {
  $error = false;

  if ($_POST['name']=='') {
    $field_error['name'] = false;
    $error = true;
  }

  if ($_POST['email']=='') {
    $field_error['email'] = false;
    $error = true;
  }

  if (!$error) {
    //process form & redirect
  }

}

echo "<form>\n";
$color=($field_error['name']===false)?'#ff0000':'#000000';
echo "<input type=\"text\" name=\"name\" value=\"".$_POST['name']."\" style=\"background-color:$color\">\n";
$color=($field_error['email']===false)?'#ff0000':'#000000';
echo "<input type=\"text\" name=\"email\" value=\"".$_POST['email']."\" style=\"background-color:$color\">\n";
echo "<input type=\"submit\" value=\"true\" name=\"Submit\">\n";
echo "</form>\n";

?>

 

This is not tested, but you should get the idea. I just slapped this together, so I am sure there is a more efficient method.

Yeah thats a better and more reliable way to do it. If you do that, make sure you use trim() because there may be whitespace in the value.

 

foreach ($_POST as $key => $value)
{
$_POST[$key] = trim($value);
}

[PHP_PhREEEk]

i normally grab all the POST data then if its empty say so

 

I took from that that the OP meant error-checking 'on the fly' within the browser, not by refreshing the page and then generating the errors. My bad if that wasn't correct...

 

PhREEEk

[asmith]

PhREEEk is right . he means without refreshing the page . that's the thing php can't do !

[papaface]

PhREEEk is right . he means without refreshing the page . that's the thing php can't do !

Then it shouldn't be in this section of the forum.

[PHP_PhREEEk]

PhREEEk is right . he means without refreshing the page . that's the thing php can't do !

Then it shouldn't be in this section of the forum.

 

???

 

If it's just a question, and he doesn't know the answer, then this is the perfect spot for the initial post. If he wants more details on how to actually code it, then he should post to the JS board...

 

PhREEEk

[graham23s]

Thanks a lot guys i think i know what i'm doing now:)

 

Graham

[Psycho]

In any event, JavaScript should not be relied upon as the only means of validation.