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Sure there have been all kinds of whacky plug-ins over the years aimed at achieving this, but never a single standard that we could work towards.
Form validation normally used to occur at the server, after the client had entered all the necessary data and then pressed the Submit button.
Also, the ‘@’ must not be the first character of the email address, and the last dot must at least be one character after the ‘@’ sign.
Most often, the purpose of data validation is to ensure correct user input.
For these examples we have created our own valid/invalid CSS formatting to override the browser default. That's why you may see something like the following: Before you type anything into the box a red marker is shown.
As soon as a single character has been entered this changes to a green marker to indicate that the input is 'valid'.
In this article we intend to present only a number of simple examples to get you started, covering the basic form elements.