Accessing parameter of one function from another in javascript

Question

var vehiclePage = (function(){
 // defined these 3 public variable. to share between zoomNoShowFee & submitVehicle 
    this.obj;
    this.rate;
    this.idx;
    var setPara = function(o,t,i){
        this.obj = o;
        this.rate = t;
        this.idx = i;
    }
    return {
        zoomNoShowFee : function(o,t,i){
              // this is existing function. I need to access o,t,i inside submitVehicle function.
            setPara(o,t,i);  // wrote this private function to set values
        },
        submitVehicle : function(){
                   // here I need to access zommNoShowFee's parameter
                     alert(this.rate);
        }
    } // return
})();
vehiclePage.zoomNoShowFee(null,5,3);
vehiclePage.submitVehicle();  // getting undefined

zoomNoShowFee is already existing. Some other fellow developer wrote this. I want to use the values passed into zoomNoShowFee parameters inside submitVehicle.

For that I declared 3 public variables at the top and trying to store the values using setPara private function. so that I can access those public variables inside submitVehicle function.

But getting undefined when calling vehhiclePage.submitVehilce()

Fundamentally, I doing something wrong. But don't know where...

Thanks for any help...

Alsciende · Accepted Answer · 2010-05-11 13:57:15Z

1

In your use of the module pattern, you're mixing a few things. this.obj, this.rate and this.idx are properties of the wrong this object. In fact, they are properties of the global object, and you can verify this:

vehiclePage.zoomNoShowFee(null,5,3);
alert(rate); // alerts '5'

So, you have to store your values somewhere else. It's quite easy, though : just use regular variables instead of properties and you're good to go :

var vehiclePage = (function(){
    var obj, rate, idx;
    var setPara = function(o,t,i){
        obj = o;
        rate = t;
        idx = i;
    }
    return {
        zoomNoShowFee : function(o,t,i){
            setPara(o,t,i);
        },
        submitVehicle : function(){
            alert(rate);
        }
    } // return
})();
vehiclePage.zoomNoShowFee(null,5,3);
vehiclePage.submitVehicle();

edited May 11, 2010 at 13:57

answered May 11, 2010 at 13:37

Alsciende

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