I’m developing a web site that has a search box as part of the standard page template (similar to what you see on the top right of the SO site). I want to dynamically preview possible matches to the user input, similar to what you see when you start typing in a query into the google.com search page, as a drop down that appears underneath the search box. How do you do this? Some sort of JavaScript/Ajax combination?
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There is a popular jQuery plugin to achieve this. Check the docs.