Where should you use Ajax?

Where should you use Ajax?
1. Form validation:
As I said earlier, if every time if the user gets the validation results only after submitting the form it will be irritating. So you can use ajax in form validation.
2. Light Box:
Popups are always irritating and maximum browsers block them too. So a nice and cool alternative of popup is lightbox which is a nice implementation of ajax.
3. Sort or Filter:
Sometimes we want to filter the search results or some other thing by date, popularity, cost and blah blah. In that case ajax is a really nice technique.
4. Vote or Rating:
The whole site need not to be refreshed if a user votes for something or rates your product. The voting and displaying result can be done using ajax.
5. Chat websites:
Chatting is always real time. That’s why you must use ajax if you are going to make a chatting panel in your website.
6. Blog Comments:
Comments of your blogs are not useful for search engines. So you can load the previous comments or can post a new one with ajax.
7. Captcha:
To make captcha (reloading captcha basically) you should use ajax.
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