How to trigger onclick function when user inputs keywords? Jquery

I have an input box I use Jquery and I have onclick event for "doSearch". So when I enter some words like "ab" .. and click on "icon" It sends an ajax request to php file and gets results back appended to dom. $('#doSearch').click(function() { $(".showResults").show("fast"); var input_text = $('input[name="search"]').val(); //retrieve text $.ajax({ method: "get" ... ... some more lines }) etc etc I am wondering how can I trigger onclick function automatically, when some characters are entered in the input box so that users dont have to click on image icon to get the results. Also, how I can set focus on the image icon when I press tab key while in the input box. Thanks a lot for your help. EDIT: I have some other input boxes in the same form as well. So this input acts as somewhat similar to stack overflow tags input.

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