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    <p>You will need to write a custom filter on server side to filter the results. What you type in the box is saved in 'term' and then 'q' is sent as a request parameter with the ajax call. So the ajax call to<br> url:"/concepts/names_for_search?q=deri"<br> should only return the filtered results and not all the results. </p> <p><b>Update</b><br> Select2 will make an AJAX call every time you type in the search box. You have to filter the results on server side and then return the results based on the text in search box.<br> I am using it in my JSP/Servlet application as below </p> <pre><code>protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String searchTerm = request.getParameter("q"); String json = getOptions(searchTerm); //getOptions method will return a string of in JSON format //[{"id":"1","name":"Derivatives"}] response.getWriter().write(json); } </code></pre> <p>Your JavaScript code is correct.</p> <p>I found Select2 is used <a href="http://www.indiewebseries.com" rel="noreferrer">here</a>. If you open the link <a href="http://www.indiewebseries.com/search?q=ind" rel="noreferrer">http://www.indiewebseries.com/search?q=ind</a> and <a href="http://www.indiewebseries.com/search?q=in" rel="noreferrer">http://www.indiewebseries.com/search?q=in</a> the results obtained are different and based on the 'q' parameter.<br> While in you case, the results for calls to url '/concepts/names_for_search?q=d' and '/concepts/names_for_search?q=deri' are the same(i.e. not filtered) </p>
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    1. COHey Thanks and sorry this response is so late. Is there any way to just re-use their filter as if I weren't doing AJAX (maybe copy/pasting from their source code)? Also, do you know of any examples you could point me to? Light-googling has turned up surprisingly little. Thanks a lot for your help - once I am able to upvote people, you'll definitely get one.
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    2. CO@MichaelNomitch - I have updated the answer. Hope this helps.
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