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    <p>According to the <a href="http://jqueryui.com/demos/autocomplete/" rel="noreferrer">documentation</a>, when using a URL as the source, the response will need to be a JavaScript array:</p> <blockquote> <p>When a String is used, the Autocomplete plugin expects that string to point to a URL resource that will return JSON data. It can be on the same host or on a different one (must provide JSONP). The request parameter "term" gets added to that URL. The data itself can be in the same format as the local data described above.</p> </blockquote> <p>So, your URL is going to have to be something that returns a JavaScript array, <strong>not</strong> a simple HTML page like you're using. Here's a working example using a ASP.NET handler (I call it <code>autocomplete.ashx</code>):</p> <pre><code>&lt;%@ WebHandler Language="C#" Class="autocomplete" %&gt; using System; using System.Web; using System.Web.Script.Serialization; using System.Linq; public class autocomplete : IHttpHandler { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "application/javascript"; //load your items from somewhere... string[] items = { "ActionScript", "AppleScript", "Ruby", "Scala", "Scheme" }; //jQuery will pass in what you've typed in the search box in the "term" query string string term = context.Request.QueryString["term"]; if (!String.IsNullOrEmpty(term)) { //find any matches var result = items.Where(i =&gt; i.StartsWith(term, StringComparison.CurrentCultureIgnoreCase)).ToArray(); //convert the string array to Javascript context.Response.Write(new JavaScriptSerializer().Serialize(result)); } } public bool IsReusable { get { return false; } } } </code></pre> <p>HTML and JavaScript:</p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head&gt; &lt;title&gt;Auto complete demo&lt;/title&gt; &lt;script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.min.js"&gt;&lt;/script&gt; &lt;link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" /&gt; &lt;script type="text/javascript"&gt; $(document).ready(function () { $("#tags").autocomplete({ source: '/autocomplete.ashx' }); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;input type="text" id="tags" /&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. POHow do I use jquery's UI autocomplete with ASP.NET and an external data source?
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    1. POHow do I use jquery's UI autocomplete with ASP.NET and an external data source?
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    1. COThanks, this is definitely the clarification I need. However, the array is still not accepted by jquery's autocomplete. Would the "{" vs. the "[" have anything to do with it? Can that be changed?
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    2. COI updated my C#, and provided a working example with HTML and Javascript. Try it out.
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    3. COHmm...I'm getting an XML parsing error with your new code. However, I did get the whole array to populate regardless of what I entered in the textbox which is progress in my book.
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