Description
Use this filter to create custom validation logic.
Usage
Applies to all forms
<?php
add_filter("gform_validation", "custom_validation");
?>
You can also specify this per form by adding the form id after the hook name.
<?php
add_filter("gform_validation_6", "custom_validation");
?>
For an exhaustive walk-through on using the gform_validation hook see Using the Gravity Forms "gform_validation" Hook
Parameters
$validation_result
- (array) contains the validation result and the current Form Object
Examples
This example uses the gform_validation filter to prevent a specific number from being entered in a field.
<?php
add_filter('gform_validation', 'custom_validation');
function custom_validation($validation_result){
$form = $validation_result["form"];
//supposing we don't want input 1 to be a value of 86
if($_POST['input_1'] == 86){
// set the form validation to false
$validation_result["is_valid"] = false;
//finding Field with ID of 1 and marking it as failed validation
foreach($form["fields"] as &$field){
//NOTE: replace 1 with the field you would like to validate
if($field["id"] == "1"){
$field["failed_validation"] = true;
$field["validation_message"] = "This field is invalid!";
break;
}
}
}
//Assign modified $form object back to the validation result
$validation_result["form"] = $form;
return $validation_result;
}
?>
Source Code
This filter is located in form_display.php