For example, an "x" is entered in an integer field. It adds a flag dropdown to any input, detects the user's country, displays a relevant placeholder and provides formatting/validation methods. Check the following links for more useful informations about Thymeleaf: Thymeleaf Articles Creatings forms in Thymeleaf 2. if you need to add phone number validation like it must be 10 digit mobile number or 11 digit, 12 digit then you can easily do it from this example. Take Bootstrap to the next level with premium themes from the official Bootstrap Themes marketplace. js-form-validation.css is the stylesheet containing styles for the form. function validating($phone){ $valid_number = filter_var($phone, FILTER_SANITIZE_NUMBER_INT); $valid_number = str_replace("-", "", $valid_number); if (strlen($valid_number) < 10 || strlen($valid_number) > 14) { echo "Invalid Number
"; } else { echo "Valid Number
"; } } validating("+1-202-555-0170000"); You don't need to do that when i) using HTML 5 type="number" attribute, ii) and the step attribute is not specified, or its value is an integer In a way, contact forms become complex in positioning fields, giving fluidity and more aspects. ). Form controls automatically receive some global styling with Bootstrap: All textual ,
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