We're going to be checking the form using a function, which will be activated by the form's Validating this form would be considerably simpler than one containing radio buttons or select boxes, but any form element can be accessed.
Below are the ways to get the value from all types of form elements.
While our message will be easily spotted by sighted users, people using assistive technology like screen readers may not inherently know a message has been added to the DOM.
See the Pen Form Validation: Mail Chimp with Ajax Submit by Chris Ferdinandi (@cferdinandi) on Code Pen.
Usually you'll just want to check if Modern Web Design Using Java Script & DOMJava Script is back!
This is the best book on the subject I’ve ever read, showing you step-by-step the smartest ways to create usable, useful DHTML effects to enhance your site.
When you submit a form to a CGI program that resides on the server, it is usually programmed to do its own check for errors.
If it finds any it sends the page back to the reader who then has to re-enter some data, before submitting again.