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JavaScript

Working with AJAX and Express - form validation

Hi! How would i go about validating a login/register - form with ajax before the data is getting sent to the express server? The reason being is, my form is a modal from bootstrap. Upon submitting, the page reloads and the modal goes away. My idea is to add the has-danger class from bootstrap when required fields are left empty. So, if some error occur i don't want to leave the page and display the errors. If no error occurs i want to leave the page and the Express server will redirect.

Is there any reason you don't want to use HTML validations?

There is a required attribute which can be styled ... https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Forms/Data_form_validation