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I’m sure you’ve seen those nice interactive form validations on some Web 2.0 websites. The validation occurs while you’re typing your form input. For example, you’re typing your email in the email address field. You see a red “X” mark beside the field and when you’re finished typing your email address, a green check mark replaces the red “X” mark. What happens there is while you’re typing in your email address, the page communicates with the server to validate what you’re typing. When you finished typing your email address and the data you keyed in is valid, it passes the validation so it shows the green check mark without reloading the page. This is done using Ajax.
We didn’t do the little red “X” and green check marks here but with just a little creativity, you should be able to implement this.
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