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How to remove addEventListener when jumping between frames?

Explorer ,
Mar 17, 2022 Mar 17, 2022

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Hi, I seem to have trouble removing addEventListeners when I jump between frames. When I jump back and forth, the addEventListeners still seem to stack up:

 

removeEvtList.gif

 

Frame 1 code:

this.stop();

this.arrowForward_btn.addEventListener("click", arrow_btnClickForward.bind(this));

function arrow_btnClickForward() {
	this.arrowForward_btn.removeEventListener("click", arrow_btnClickForward.bind(this));
	console.log("went forward");
	alert("alert: went forward!");
	this.gotoAndStop(1);
}

 

Frame 2 code:

this.arrowBack_btn.addEventListener("click", arrow_btnClickBack.bind(this));

function arrow_btnClickBack() {
	this.arrowBack_btn.removeEventListener("click", arrow_btnClickBack.bind(this));
	console.log("went back!");
	alert("alert: went back!");
	this.gotoAndStop(0);
}

 

How do I remove the addEventListeners so that they don't stack up?

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correct answers 1 Correct answer

LEGEND , Mar 17, 2022 Mar 17, 2022

.bind() returns a new, unique function reference every time it's called on a function, so of course you can't use it with removeEventListener().

 

Since you're attempting to remove the event inside its own event handler, you can use evt.remove()

https://www.createjs.com/docs/easeljs/classes/Event.html

 

Or, instead of using .addEventListener(), you could just use .on() with the once flag.

https://www.createjs.com/docs/easeljs/classes/EventDispatcher.html#method_on

 

 

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LEGEND ,
Mar 17, 2022 Mar 17, 2022

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.bind() returns a new, unique function reference every time it's called on a function, so of course you can't use it with removeEventListener().

 

Since you're attempting to remove the event inside its own event handler, you can use evt.remove()

https://www.createjs.com/docs/easeljs/classes/Event.html

 

Or, instead of using .addEventListener(), you could just use .on() with the once flag.

https://www.createjs.com/docs/easeljs/classes/EventDispatcher.html#method_on

 

 

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Explorer ,
Mar 17, 2022 Mar 17, 2022

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Thanks! evt.remove(); works great after I added it into the functions.

 

Frame 1 code:

this.stop();

this.arrowForward_btn.addEventListener("click", arrow_btnClickForward.bind(this));

function arrow_btnClickForward(evt) {
	console.log("went forward");
	alert("alert: went forward!");
	this.gotoAndStop(1);
	evt.remove();
}

Frame 2 code:

this.arrowBack_btn.addEventListener("click", arrow_btnClickBack.bind(this));

function arrow_btnClickBack(evt) {
	console.log("went back!");
	alert("alert: went back!");
	this.gotoAndStop(0);
	evt.remove();
}

 

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