Javascript callback function with parameters [duplicate]

Answer 1

Adding parameters when calling a function. https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function/apply

xdaz already answered the simple version. Here is an example with variable amount of parameters.

function someObject(){
        this.callbacks=new Array();
        this.addCallback=function(cb){
            this.callbacks[this.callbacks.length]=cb
        }
        this.callCallbacks=function(){
            //var arr=arguments; this does not seem to work
            //arr[arr.length]="param2";
            var arr = new Array();
            for(i in arguments){
                arr[i]=arguments[i];
            }
            arr[arr.length]="another param";
            i=0;
            for(i in this.callbacks){
                this.callbacks[i].apply(null,arr);
                //this.callbacks[i].apply(this,arr);
                //this is a ref to currrent object
            }
        }
        this.callCallbacksSimple=function(arg){
            for(i in this.callbacks){
                this.callbacks[i](arg,"simple parameter");
            }

        }
}
function callbackFunction(){
    for(i in arguments){
        console.log("Received argument: " + arguments[i]);
    }
}
var ObjectInstance=new someObject();
ObjectInstance.addCallback(callbackFunction);
ObjectInstance.callCallbacks("call callbacks");
ObjectInstance.callCallbacksSimple("call callbacks");