What is the process for JavaScript from validation?

JavaScript form validation typically occurs after the form is submitted but before the form data is sent to the server. This allows the client-side script to check the input data and prevent the form from being submitted if the data is invalid.

Client-Side Validation:

Before Form Submission: JavaScript validates the form fields after the user attempts to submit the form.

Prevent Default Submission: If the validation fails, JavaScript can prevent the form from being submitted and display appropriate error messages.

Usage Example:

document.getElementById("myForm").addEventListener("submit", function(event) {

var isValid = true;

// Perform validation checks

if (!isValid) {

event.preventDefault(); // Prevent form submission

alert("Please correct the errors.");

}

});

This example prevents form submission if the validation fails.

References:

MDN Web Docs on Form Validation

W3C HTML Specification on Form Submission