An in-depth explanation of the jQuery Validate validation framework.

2 years ago
Liam
2 minutes

jQuery Validate is a jQuery plugin that can be used to validate forms on the client-side. It offers a simple and flexible way to validate user input, with a variety of built-in validation rules and error messages.

Here are some common features and usage of jQuery Validate:

  1. Introducing jQuery and jQuery Validate plugins:
  2. I’ll need to include the jQuery library version 3.5.1 and the jQuery validation plugin version 1.19.2 in my script.
  3. Initialize validator.
  4. When the document is ready, make sure to validate the form with the id “myForm.”
  5. Add verification rules:
  6. The following form requires the user to input their username, email, password (min length of 6 characters), confirm password, and then submit the form.
  7. In the above code, “required” indicates that the field cannot be empty, “minlength” indicates the minimum length, and “equalTo” indicates that it should be equal to the specified field.
  8. Include error message:
  9. When the document is ready, validate the form with the following messages:
    – For the username field, remind the user to enter their username
    – For the email field, prompt the user to input a valid email address
    – For the password field, ask the user to provide a password that is at least 6 characters long
    – For the confirm password field, instruct the user to enter the same password as above.
  10. In the code above, use the ‘messages’ option to specify error messages for each field.
  11. Custom validation rules:
  12. $.validator.addMethod(“customRule”, function(value, element) {
    // Implementation of custom validation rule
    return value === “custom”;
    }, “Please enter ‘custom'”);

    $(document).ready(function() {
    $(“#myForm”).validate({
    rules: {
    username: {
    required: true,
    customRule: true
    }
    }
    });
    });

  13. In the above code, a custom validation rule named customRule was added using the addMethod method.
  14. Callback function after successful form validation.
  15. When the document is ready, validate the form with the ID “myForm”. If the validation is successful, show an alert message saying “Form submitted successfully” and submit the form.
  16. The above code uses the submitHandler option to define a callback function that executes after the form validation is successful.

The above information covers some basic usage and functions of the jQuery Validate validation framework. It also offers many other options and methods for more detailed configuration and usage according to specific needs. Detailed API documentation can be found on the official jQuery Validate website.

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