javascript - Tab "shown" event not firing - Twitter Bootstrap -

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When a tab changes, I'm trying to fire an AJAX call. However, I may not even want to do this basic test work: 

  & lt; Ul class = "nav nav-tabs" & gt; & Lt; li class = "" & gt; & Lt; A data-toggle = "tab" href = "# gqs-uploader" id = "gqs-uploader-btn" & gt; Uploads & lt; / A & gt; & Lt; / li & gt; & Lt; Li class = "active" & gt; & Lt; Data-toggle = "tab" href = "# gqs-results" id = "gqs-results-btn" & gt; Results & lt; / A & gt; & Lt; / li & gt; & Lt; li class = "" & gt; & Lt; Data-toggle = "tab" href = "# gqs-download" id = "gqs-download-btn" & gt; Download & lt; / A & gt; & Lt; / li & gt; & Lt; / Ul & gt;   
 and javascript:  
  (function ($) {"strict use"; $ (function () {$ (document) .on ('shown' Has been done, a [data-toggle = "tab"] ', function (e) {alert (' tab changelog ');})}}}}} (jQuery));   
 When a tab changes, then I should send a warning  
  Why is this simple example not working?   
 The original example in the docs is either Does not work. The whole event (even the button click) seems invisible - I want it any   
 
 
 
  $ (document) ) .on ('shown.bs.tab', 'a [data-toggle =' tab]], function (e) {alert ('tab changed');})

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