You can do this a couple of ways. 

The most simple, understandlbe way is to use the `that` variable:


    var that; 
    $('#' + this.ID + ' .selMake').on('change', that.getCarModel); // This will execute the function this.getcarModel

You can also use the `bind` method in browsers that support ES5.


    $('#' + this.ID + ' .selMake').on('change', this.getCarModel.bind(this));


If you're using underscore you might want to use its `_.bind` function in order to make it cross-browser compatible:

 

    $('#' + this.ID + ' .selMake').on('change', _.bind(this.getCarModel. this));