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POJQuery autocomplete - How do I control list based on nearby DOM elements without using id?
 

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    <p>This is in JQuery, using the JQuery-UI version of autocomplete</p> <p>I'm in a bit of an edge case. I'm working inside a form that must be indefinitely cloneable, so I can't use id tags for unique identification, and I can't just search down from the top to find something that looks like the DOM elements I'm working with - I have to use relative functions (.closest, .find, and so forth). Inside this form, I have a setup with a country field, a state field, and a location field, and the location field is supposed to be an autocomplete, fed from a link, where it hands the current value of the country and state fields on the link going up for server-side filtering. I'd <em>like</em> it to go something like this:</p> <pre><code>function locPrep(locNode) { $locNode.autocomplete({ source: function (request, response) { $locDiv = $(this).closest("div.locWrapper"); $stateNode = $locDiv.find("input.state"); $countryNode = $locDiv.find("input.country"); $.post("/FormHost/AutocompleteLocList", {state:$stateNode.val(), country:$countryNode.val(), term:request.term }, function (data) { response(data); } ); } }); } </code></pre> <p>...except that that doesn't work because the $(this) for the source function isn't locNode, and I can't just declare it outside and use it inside because locPrep gets called repeatedly, once for each autofill in the form. If I try that, the fact that Jquery makes everything global causes all of the autofills in the form to reference the country and state fields for the last one. I tried using javascript vars to get around the scoping issues and it broke strangely. Can anyone help?</p> <hr> <p>Edit: thanks to Dmitriy Naumov's kind assistance, I was able to hammer together a functioning solution (though I'm still not entirely sure <em>why</em> it works, given some of the things that I tried that did not). I'm including the functioning code in the hopes that it may help someone else later. (I've certainly gained quite a lot from the answered questions of others.)</p> <p>First, I went through and changed every instance where I called the function from "locPrep(foo);" to "new locPrep(foo);" I also changed it to take locDiv rather than locNode. Then, I changed the code to the following (though this is, as that was, a somewhat simplified version).</p> <pre><code>function locPrep(locDiv) { $locNode = $(locDiv).find("input.locationAutofill") $locNode.autocomplete({ source: function (request, response) { var stateVar = $(locDiv).find("input.state").val(); var countryVar = $(locDiv).find("input.country").val(); $.post("/FormHost/AutocompleteLocList", {state:stateVar, country:countryVar, term:request.term }, function (data) { response(data); } ); } }); } </code></pre> <p>I'm not entirely sure which bits of this were necessary, but as a group they manhandle the code around to using tight enough scoping to solve the issue.</p>
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