How does reddit's login validate credentials without reloading the page? [closed]

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When you enter your credentials on reddit login page, it first checks their validity and if they're valid only then it redirects, otherwise the fields are updated with a "wrong password" message.

I'm trying to understand how the submit button validates the credential without actually submitting the form, and thus, reloading the page.

Answer 1

The answer is Ajax: Asynchronious javascript and XML.

The purpose of ajax is exactly what you said. Google ajax for more info.