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I've been trying to learn to make a nice Javascript form validation with the help of Protoype, Scriptaculous and the validation addon (http://www.tetlaw.id.au/view/javascript … validation). All the standard checks went fine, but then I tried to implement a more advanced thing - to use Ajax to check if the login already exists.
Here's the validation part:
<script type="text/javascript">
var valid = new Validation('signup', {immediate: true, onFormValidate: formCallback});
Validation.addAllThese([
['validate-login-uniqueness', 'Login is already in use.', function(v) {
return is_unique_login('index.php?{$gets}',$('signup_login').value);
}]
]);
</script>signup_login is the id of the login input field. $gets has all the GET-parameters so practically calls the same page on which the form exists. The response value is the "select count()" result, 0 or 1 from the database.
and then the Ajax function
function is_unique_login(url,login){
var pars = "ajax=1&is_unique_login="+login;
var value;
new Ajax.Request(
url,
{
method:'post',
parameters: pars,
onComplete: function(resp){
value = resp.responseText == 0 ? true : false;
}
}
);
alert(value);
return value;
}The problem is that value-attribute never gets true or false value at the onComplete part.
Last edited by sven (2007-08-20 19:40:00)
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I solved it! asynchronous:false was the thing I needed to add to options. This way the function waits for the request to complete and then assigns the value to the variable. I spotted it thanks to some tests I did with alert(). I saw that when executing alert took some extra time, the result was right.
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