Written
The ChronoForms alpha and alphanumeric validation uses a strict test and will allow only a-z, A-Z. For many languages this isn't useful.
Here are some workarounds:
Serverside validation
You can add a Custom Serverside Validation action to check your alphabet using code like this (change the $regex line and the 'input_name' to suit your needs):
<?php
$data =& $form->data['input_name'];
$regex = '/^[ÅÄÖa-z ._-]+$/i';
if ( isset($data) && $data ) {
if ( preg_match($regex, $data) === 0 ) {
$form->validation_errors['input_name'] = "Invalid data";
return false;
}
}
?>Here's a second example using a Unicode Script specifier to select a whole range of characters. See here for a list of Unicode Scripts that you can use in place of \p{Greek}
<?php
$data =& $form->data['input_name'];
$regex = '/\A\p{Greek}+\Z/iu';
if ( isset($data) && $data ) {
if ( preg_match($regex, $data) === 0 ) {
$form->validation_errors['input_name'] = "Invalid data";
return false;
}
}
?>Clientside validation in CFv4
You can create a custom validation by adding a validation function in a Load JS action in the ON Load event
function customAlpha(el){
if (!el.value.test(/^[ÅÄÖa-z ._-]+$/i)) {
el.errors.push("Please only use alphabetic characters");
return false;
} else {
return true;
}
}
Then add this into the Class box of the element that you want to validate:
validate['required','%customAlpha']
Again, change the regex expression and the error message to meet your needs. Note that you must keep the a-z range to include unaccented characters.
Clientside validation in CFv5
This is similar to CFv4 but you can now add the name of a custom validation function in the Custom Function the bottom of the Validation tab in an input element. This example is a check for characters in the Turkish alphabet.
In the Custom Function box add checkTurkish
In a Load JavaScript action in the form On Load event add code like this
function checkTurkish(el) {
var pattern = /^[a-zA-Z0-9[şŞıİçÇöÖüÜĞğ\ \-_]+$/;
return pattern.test(jQuery(el).val());
}
