The focusout() method in jQuery is used to remove the focus from the selected element. Now we will use focusout() method to validate the input field while focussing out. This method checks whether the input field is empty or not. Also, use some CSS property to display input field validation. If the input field is empty then it will display the red border input field otherwise display green border input field.
Example 2: Validation alert if input field empty using siblings(), addClass() method.
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