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Mootools – Using .bind(this)

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From MooTools Users | Google Groups


#############
var toto = new Class ({

Implements: Options,

options: {
message: "toto"
},

initialize: function(elem, options){
this.setOptions(options);
this.alternateMessage = "a message";
this.elem = elem;
this.elem.addEvent('click', function(){
this.alternateMessage = "other message";
this.aMethod();
}.bind(this));
},

aMethod: function(){
alert(this.options.message);
}

});

##################

in this class, you can see two effects of this binding in this
function

this.elem.addEvent('click', function(){
this.alternateMessage = "other message";
this.aMethod();
}.bind(this));

– this.alternateMessage is now changed for the whole class, not only
inside the fucntion as this refers to the class
– without binding the click function with .bind(this) the result would
be «this.alternateMessage has no properties», «this.aMethod() is not a function»
binding the function to the class (this) allows it to use any method
or this.var set inside it