Html code for validating forms
One option is to not do anything and rely on your server-side validation only.
Required fields can use the Now, in addition to showing the help text when the input field receives focus, we'll also show the help text when the input field's value is invalid.Today I’m going to walk you through validating a simple booking form by using the Constraint API, and keep an eye on how you can make sure your forms stay accessible too.To recap—or in case you haven’t read Sandeep’s article—with the dawn of HTML5, a raft of new input types and attributes were added to tags that allow the browsers themselves to perform the client-side validation for us: no Java Script required.Live demo: Longmuir/pen/Wb Oydx data-validate is injected in all the input fields of your form but when using js Form Validator, you don't require this heavy syntax and the validation will be applied to your form in one shot, without need to touch at your HTML code.
A few months ago Sandeep introduced us to the HTML Constraint API, showing how we can use the new HTML5 input types and attributes to validate our forms in the browser with minimal Java Script.
It also means that if you click the label, the associated input tag receives the focus.