Advice on some simple error control

[Anon]

I created a form (as some of you may know) for people to fill out for a job. I need some error control (ie. If the user does not fill out a required field, they get an error saying they must go back and fix it. I started using an if statement....if everything looks fine, they get to go on to the next part of the form. Its basicly like this:

if(empty($lastname))
{
echo"You did not fill out your last name.";
}else{
include("form2.php");
}

What I need to do is have more variables check in the 'if statement.'

[Anon]

I would use client-side validation in the form of Javascript:

<script language="javascript">
<!-->
function validate_form(form)
{
if (form.lastname.value==""){
alert("You did not fill out your last name");
return false;
} else { return true;}
}
//-->
</script>

and in the HTML....
<form action="..." .... onSubmit="return validate_form(this)">
.
.

[Anon]

i really dont want to get into javascript. I need the error control for part of my script so that another part of my script works fine.

[Anon]

if you do the form validation on the client side, you can make sure that the user enters in the correct value BEFORE the value is sent back to the server. that way, your error control is handled w/out having the server to do it....
if not, try this.....

$errormsg = validate_form($HTTP_POST_VARS, $errors);

if (!empty($errormsg)) {
print "ERROR";
} else {
do whatever.....
}

function validate_form(&$frm, &$errors)
{
$errors = new Object;
$msg = "";

if (empty($frm["oldpassword"])) {
$errors->oldpassword = true;
$msg .= "Input is incorrect";
}

return $msg;
}

[Anon]

SORRY - that function should look like...

function validate_form(&$frm, &$errors)
{
$errors = new Object;
$msg = "";

if (empty($frm["name of variable"])) {
$errors->$variable = true;
$msg .= "Input is incorrect";
}

return $msg;
}

OR SOMETHING...

[planetphp]

This is how i do it...

if(empty($your_variable)) error_message("Enter the info!");

and this is the error function that makes the error box pop up... once they click ok they go back to exactly where they came from.

function error_message($msg) {
echo "<SCRIPT>alert(\"Error: $msg\");history.go(-1)</SCRIPT>";
exit;
}