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  1. PO
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    <p>I'm afraid you've misunderstood how jQuery works; your <code>if</code> statements don't make sense at all.</p> <p><code>$("[id!='']")</code> will <em>always</em> return a jQuery object which, due to JavaScript's automatic type coercion, will <em>always</em> evaluate to <code>true</code>. In other words <code>$("[id!='']") == true</code> no matter what your HTML looks like. The same applies for the rest of your <code>if</code> statements.</p> <p>Because of this mistake your code retrieves <em>both</em> the results of the UPS and FedEx scripts <em>every time</em>. Since the AJAX calls are asynchronous your results may appear in different orders thus causing an apparently random clearing of the data (when the empty data is returned <em>after</em> the correct data).</p> <p>This is how I assume you intended your code to behave:</p> <pre><code>$(document).ready(function(){ // Select all of the tracking numbers on the page $(".trackingnumber"). // Display some text in each, indicating that we're getting status text("working..."). // Begin getting status for each tracking number. each(function () { var trackingNumber = this.id; // Use the fedex script by default ... var script = "fedex"; if (trackingNumber.match(/^1z/i)) { // ... unless it's a UPS tracking number. script = "ups"; } $.post("inc/" + script + ".php", { v: trackingNumber }, function(data){ $("#" + trackingNumber).html(data); }); }); }); </code></pre> <p><strong>Working Demo:</strong> <a href="http://jsbin.com/iyeci" rel="nofollow noreferrer">http://jsbin.com/iyeci</a> (editable via <a href="http://jsbin.com/iyeci/edit" rel="nofollow noreferrer">http://jsbin.com/iyeci/edit</a>)</p> <p>Don't hesitate to ask if you need more help understanding the code.</p>
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    1. POjQuery/AJAX: each, if, post, .html: Runs but randomly deletes data
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    1. USbrianpeiris
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    1. COExcellent! I was using the if ['id^'blah'] due to reading that it was more efficient than the match, and was figuring that wasn't the issue (despite the working... one wasn't correctly not showing when there wasn't any tracking number in the id) since it was deleting the data randomly. Thank you so much!
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      1. USCameron Conner
    2. COI've added: if (trackingNumber.length !=0) { $(this).text("working..."); }; To the code so that "working..." only displays when there actually is something to work on. Just for future reference. :)
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      1. USCameron Conner
    3. COGlad I could help. If you want to exclude `trackingnumber`s that don't have an `id`, use `$(".trackingnumber[id!='']")` instead of `$(".trackingnumber")`. Adding that `if` statement won't prevent the unnecessary AJAX request.
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