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    <p>First off, the data source you're using <strong>does not support JSONP</strong>. You can't just grab an arbitrary JSON data source and tell jQuery it's JSONP and expect it to work. The server must be configured to take a callback argument that it appends to the response, calling your code when it completes and is injected onto the page.</p> <p>You can get around this by using <a href="http://developer.yahoo.com/yql/" rel="nofollow">YQL</a> or writing your own server-side code that calls the service.</p> <p>Here's an example using YQL:</p> <pre><code>function buildQuery(term) { return "select * from json where url = 'http://airportcode.riobard.com/search?fmt=JSON&amp;q=" + encodeURI(term) + "'"; } function makeRequest(request, response) { $.ajax({ url: 'http://query.yahooapis.com/v1/public/yql', data: { q: buildQuery(request.term), format: "json" }, dataType: "jsonp", success: function(data) { var airports = []; if (data &amp;&amp; data.query &amp;&amp; data.query.results &amp;&amp; data.query.results.json &amp;&amp; data.query.results.json.json) { airports = data.query.results.json.json; } response($.map(airports, function(item) { return { label: item.code + (item.name ? ", " + item.location : "") + ", " + item.location, value: item.code }; })); }, error: function () { response([]); } }); } $(document).ready(function() { $("#airport").autocomplete({ source: makeRequest, minLength: 2 }); });​ </code></pre> <p>So instead of calling the web service directly, we'll ask YQL to make the request and return a result. YQL acts as a wrapper, making an otherwise inaccessible web service accessible via JSONP.</p> <p>In the <code>success</code> method, we have to go through several properties to finally access the data. After we do that, we can format the results in a way that the autocomplete widget expects (with <code>$.map</code>).</p> <p><strong>Example:</strong> <a href="http://jsfiddle.net/BQxw4/40/" rel="nofollow">http://jsfiddle.net/BQxw4/40/</a></p>
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    1. COThank you. Your example works fine and What you wrote makes me total sense. I'm just trying to learn all about jquery and web services, but is quite long topic. I just added a line: term = encodeURIComponent(term); because if you look cities with blank spaces in the name, it appears not to exist because the blan space needs to be %20 Best.
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      1. USLouis
    2. CO@Louis: Glad to help! Please accept the answer if it helped `:)`
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    3. COIt doesn't work with spaces. I mean, for example, New York. How can I fix it? Thanks.
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      1. USNick Bolsh
 

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