In Vue.js, form validation can be handled using the following steps:
Create a form component: Start by creating a new component in Vue.js to handle the form. This component should have a data property for each form field and a method to handle form submission.
Bind form data with v-model: Use the v-model directive to bind each form input with a corresponding data property. This allows Vue.js to keep track of any changes made to the input values.
Add validation rules: Define validation rules for each form field as computed properties in the form component. These rules can use regular expressions or custom logic to check the validity of the input.
Display error messages: Display error messages for invalid inputs by conditionally rendering error divs or spans next to the corresponding form fields. Use v-if or v-show directives along with computed properties to determine when to show the error messages.
Disable form submission: Use the disabled attribute on the submit button to prevent form submission when there are validation errors. This can be done by binding the disabled attribute to a computed property that returns true when any form field is invalid.
Implement form submission logic: Add a method to handle form submission. This method can make an API call, save data in a database, or perform any other desired action. Before submitting the form, ensure that all form fields are valid.
By following these steps, you can handle form validation in Vue.js components effectively.