In JavaScript, what is the best way to remove a function added as an event listener using bind()?
Example
(function(){
// constructor
MyClass = function() {
this.myButton = document.getElementById("myButtonID");
this.myButton.addEventListener("click", this.clickListener.bind(this));
};
MyClass.prototype.clickListener = function(event) {
console.log(this); // must be MyClass
};
// public method
MyClass.prototype.disableButton = function() {
this.myButton.removeEventListener("click", ___________);
};
})();
The only way I can think of is to keep track of every listener added with bind.
Above example with this method:
(function(){
// constructor
MyClass = function() {
this.myButton = document.getElementById("myButtonID");
this.clickListenerBind = this.clickListener.bind(this);
this.myButton.addEventListener("click", this.clickListenerBind);
};
MyClass.prototype.clickListener = function(event) {
console.log(this); // must be MyClass
};
// public method
MyClass.prototype.disableButton = function() {
this.myButton.removeEventListener("click", this.clickListenerBind);
};
})();
Are there any better ways to do this?
this.clickListener = this.clickListener.bind(this);
andthis.myButton.addEventListener("click", this.clickListener);
bindAll
function that simplifies binding methods. Inside your object initializer you just do_.bindAll(this)
to set every method in your object to a bound version. Alternatively, if you only want to bind some methods (which I'd recommend, to prevent accidental memory leaks), you can provide them as arguments:_.bindAll(this, "foo", "bar") // this.baz won't be bound
.