jquery - Active link menu switch weird behavior (Bootstrap) -

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I'm surprised that there is not a tool to switch bootstrap between .active class The various links in the .nav bar

So I searched and did some help and tried to apply this script to my menu: 

  $ ('new li a'). ('Click', function () {warning ("class added" + $ (this) .Parent (). ('A'). Attr ('href'); $ (This) .Parent ). Parent (). ('Active'). ExitClaim ('active'); $ (this) .Parent (.) AddClass ('active');});   
 This is HTML:  
  & lt; Nav class = "navbar navbar-default" & gt; & Lt; Div class = "container-liquid" & gt; & Lt; Div class = "navbar-header" & gt; & Lt ;! - blah blah - & gt; & Lt; / Div & gt; & Lt; Div class = "fall navbar-fall" id = "navbar-collapse" & gt; & Lt; Ul class = "nav navbar-nav" & gt; & Lt; Li class = "active" & gt; & Lt; A href = "{{URL :: from ('/')}} & gt; Home & lt; / a & gt; & lt; / li & gt; & lt; li & gt; & lt; a href = "{{URL: From ('/ instructions')}"> Directions     
 It's a strange thing that when I go to  directions  class  The active  is removed from the  home > and then goes to  directions , but just like half a second, and then it's the first Goes back on the way.  
 I have "debugged" such targets:  
 ('Click', function () {warning ("clicked" + $ (this) .attr ('href')); alerts ("class removed-> "+ $ (This) .Parent () .Parent (). ('A'). Attr ('href'); Alert (" class added "$ (This) .Parent () ('A'). Attr ('href')); $ (this) .Parent (). Find ('active'). RemoveClass ('active'); $ (this). Parent Output is: Click on AddClass ('Active');});   
 and  Directions :  
     
  1.   Clicked on http: // localhost: 8000 / directions   
  2.  Class removed  http: // localhost: 8000   < Li> class added  ht Tp: // localhost: 8000 / directions    
     It seems that there is nothing wrong in targeting the right elements.  
     What is wrong with the script and why is this strange thing happening?   
     
     
     There should be something wrong with your code, as you expected the code posted here is a Bela is:  
      
      $ ('new li a'). ('Click', function () {$ (this) .Parent () ('active'). Removeclass ('active'); $ (this) .Parent (.) AddClass ('active');}) ;   
     I have removed the falling squares, so it is easy to see in Bella, but it also works with the classes.

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