Validating when the user submits the form
In addition to this the colour of the text field can be changed to provide the user with a visual feedback, e.g.
setting the text colour to red when an invalid input has been entered.
is called when the element had the focus, and the user changed to another control (which is usually an indication that they have finished with the current input field).
This module provides a series of articles that will help you master HTML forms.
Note: If you are working on a computer/tablet/other device where you don't have the ability to create your own files, you could try out (most of) the code examples in an online coding program such as JSBin or Thimble.
The first article in our series provides your very first experience of creating an HTML form, including designing a simple form, implementing it using the right HTML elements, adding some very simple styling via CSS, and how data is sent to a server.
If it finds any it sends the page back to the reader who then has to re-enter some data, before submitting again.
A Java Script check is useful because it stops the form from being submitted if there is a problem, saving lots of time for your readers.
We also look at some of the security concerns associated with sending form data.
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HTML forms are a very powerful tool for interacting with users; however, for historical and technical reasons, it's not always obvious how to use them to their full potential.
In this guide, we'll cover all aspects of HTML forms, from structure to styling, from data handling to custom widgets.
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.