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This is achieved by grouping together validation functions in "modules", making it possible to load only those functions that's needed to validate a particular form.This plugin is available through cdnjs, npm, bower and github.The script works fine even if the user does not enter any data.The next step is to make input fields required and create error messages if needed.You can use the setup function if you want to change the border color to something else, set the property to an empty string if you don't want the border color to change when the input has an invalid value.The If wanting to use a custom method that handles the displaying/removing of error messages you should use the two methods described above.There are four different callbacks you can declare when setting up the validation.There are also two types of events triggered on elements when they get validated. An input with an invalid value will automatically get a red border color.
Be aware of that any Java Script code can be added inside the - this would not be executed, because it would be saved as HTML escaped code, like this: <script>location.href(' The code is now safe to be displayed on a page or inside an e-mail.
We will also do two more things when the user submits the form: The next step is to create a function that will do all the checking for us (which is much more convenient than writing the same code over and over again). Now, we can check each $_POST variable with the test_input() function, and the script looks like this: Notice that at the start of the script, we check whether the form has been submitted using $_SERVER["REQUEST_METHOD"].
If the REQUEST_METHOD is POST, then the form has been submitted - and it should be validated.
The text will fade in when the input gets focus on and fade out when the input looses focus.
The container for the help text will have the class By default each input will become validated immediately when the input looses focus.