JavaScript remove event listener

Question

I m trying to remove an event listener inside of a listener definition   canvas addEventListener  click   function event        click        if click    50               remove this event listener here           More code here       How could I do that  this   event    Thank you

User · Answer

element querySelector   addDoor   onEvent  click   function  e        element querySelector   addDoor   removeListeners      HTMLElement prototype onEvent   function  eventType  callBack  useCapture    this addEventListener eventType  callBack  useCapture   if   this myListeners        this myListeners          this myListeners push   eType  eventType  callBack  callBack     return this       HTMLElement prototype removeListeners   function      if  this myListeners        for  var i   0  i  lt  this myListeners length  i              this removeEventListener this myListeners i  eType  this myListeners i  callBack             delete this myListeners

User · Answer

If  Cybernate s solution doesn t work  try breaking the trigger off in to it s own function so you can reference it   clickHandler   function event     if  click      49      canvas removeEventListener  click  clickHandler     canvas addEventListener  click  clickHandler

User · Answer

You could use a named function expression  in this case the function is named abc   like so   let click   0  canvas addEventListener  click   function abc event        click        if  click  gt   50               remove event listener function  abc          canvas removeEventListener  click   abc                More code here         Quick and dirty working example  http   jsfiddle net 8qvdmLz5 2    More information about named function expressions  http   kangax github io nfe

User · Answer

If someone uses jquery  he can do it like this    var click count   0      canvas    bind   click   function  event           do whatever you want     click count        if   click count    50               remove the event            this   unbind  event                Hope that it can help someone  Note that the answer given by  user113716 work nicely

User · Answer

You need to use named functions   Also  the click variable needs to be outside the handler to increment   var click count   0   function myClick event        click count        if click count    50              to remove        canvas removeEventListener  click   myClick               to add canvas addEventListener  click   myClick       EDIT  You could close around the click counter variable like this   var myClick    function  click count         var handler   function event            click count            if click count    50                  to remove            canvas removeEventListener  click   handler                        return handler      0        to add canvas addEventListener  click   myClick     This way you can increment the counter across several elements      If you don t want that  and want each one to have its own counter  then do this   var myClick   function  click count         var handler   function event            click count            if click count    50                  to remove            canvas removeEventListener  click   handler                        return handler         to add canvas addEventListener  click   myClick  0       EDIT  I had forgotten to name the handler being returned in the last two versions  Fixed

User · Answer

I think you may need to define the handler function ahead of time  like so   var myHandler   function event        click         if click    50             this removeEventListener  click   myHandler            canvas addEventListener  click   myHandler     This will allow you to remove the handler by name from within itself

User · Answer

Try this  it worked for me    lt button id  btn  gt Click lt  button gt   lt script gt   console log btn   let f   btn addEventListener  click   f function event     console log  Click    console log f   this removeEventListener  click  f   console log  Event removed         lt  script gt

User · Answer

canvas addEventListener  click   function event          click          if click    50              this removeEventListener  click  arguments callee false             Should do it

[javascript] JavaScript: remove event listener

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