One of the features of HTML5 is the ability to validate most user data without relying on scripts.
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When the specialised fields are set by the user, they update the original input's value and then fire a But I get weird results.
The error message will show up, but then when another field is focused, the error class disappears from the element (well the element wrapper), and it is also kind of a kludgy way of doing it.
Form validation helps us achieve these goals — this article tells you what you need to know.
This is called form validation — when you enter data the web application checks it to see if it is correct.
Use this event to provide custom validation for any input control, such as a Text Box. In other words, the validating control will retain the focus until the user provides the correct format, even if the user clicks another control such as a button or textbox.