javascript help

[Anon]

<?
if($sub){
if(!$name){
echo("<script language=javascript>
window.alert('you must fill name');
history.back(-1);
</script>
");
exit;
}

...

}
?>
<form action=2.html method=post>
<input type=text name=name>
<input type=text name=phone>
<input type=submit name=sub>
</form>

when user miss name and fill phone ,this script will back .
my problem is ..
phone is also disapear.

help~

[Anon]

Why not combine the whole thing on one page and put this in your form tags
<?
if($sub){
if(!$name){
echo("<script language=javascript>
window.alert('you must fill name');
history.back(-1);
</script>
");
exit;
}

                   ... 
                   } 
                   ?> 
                   <form action=2.html method=post> 
                   <input type=text name=name value="<?php print $name; ?>"> 
                   <input type=text name=phone value="<?php print $phone; ?>"> 
                   <input type=submit name=sub> 
                   </form> 

[Anon]

I know this is not PHP but it's the best way if you want to make client-side validation with javascript. Form isn't submitted if validation fails.

<script language=javascript>
function check()
{
if (document.myform.name.value == "")
{
window.alert('you must fill name');
result = false;
return result;
}
}
</script>

<form action=2.html name=myform method=post onSubmit="return check();">
<input type=text name=name>
<input type=text name=phone>
<input type=submit name=sub>
</form>