Add onChange email validation script for real-time feedback

Author: Dhruvyadav2000

Client-Side Components/Catalog Client Script/Real-Time Email Validation/email_validation_onChange.js

@@ -0,0 +1,17 @@
+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading || newValue === '') {
+        return;
+    }
+    
+    // Regular expression for email validation
+    var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
+    
+    // Test the email against the pattern
+    if (!emailPattern.test(newValue)) {
+        g_form.showFieldMsg('email_field_name', 'Invalid email format. Example: user@example.com', 'error');
+        g_form.hideFieldMsg('email_field_name', true); // Clear info messages
+    } else {
+        g_form.hideFieldMsg('email_field_name'); // Clear error message
+        g_form.showFieldMsg('email_field_name', 'Valid email address', 'info');
+    }
+}