What should I look into to accomplish this.
When you select an input field some text to the right shows up.
For example: https://twitter.com/signup
Anyway i need something like that works with PHP. What should I look in to?
And also How can you query the database and not have to reload the page to see result? For example i have seen on many sites registration you can check if the a username is used without the page reloading. Dont know how to explain better.
Thanks
Like Arkain said, they are making the text appear with JavaScript. PHP is server-side only, meaning it can't make any changes to the page once it has loaded.
You can however, call a PHP script dynamically (to check if a username is registered) using a technique called AJAX .
您需要使用JavaScript,看看这个来源,例如,对于一些新手教程。
I'd look into Ajax using jQuery. I had done some things with ajax before trying jQuery but jQuery made it so easy that I found it enjoyable to keep implementing things using it.
Learn JavaScript. You can start with jQuery (a pre-made javascript toolkit of functions that help you do many things without reloading the page).
Google for a jQuery Ajax tutorial.
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