无法访问对象方法

Question

I've created a quasi namespace/class called NewsCalendar. My intent is to avoid polluting the global namespace as well as hide functions that should be private. But when I try to call what should be a public method I get "Object does not support this property or method."

function NewsCalendar()
{
    var privatevar; //private vars

    this.onLoad = function () //public method
    {
        //Do Stuff
    };

    function getWeekStart(date) //private function
    {
        //Do Stuff
    }
}

The comments are there to indicate how I'm intending each item to behave.

I tried calling the onLoad function like this:

NewsCalendar.onLoad();

But that causes the "object does not support this property or method" error. I want to be able to use NewsCalendar like a namespace and be able to call any variables/methods attached to its this object by using NewsCalendar.propertyname or NewsCalendar.methodname().

Answer 1

You have to create instance:

var calendar = new NewsCalendar();
calendar.onLoad();

Answer 2

Try the following setup:

var NewsCalendar = (function () {
    var privatevar;

    var onLoadHandler = function () {
        //Do Stuff
    };

    function getWeekStart(date) {
        //Do Stuff
    }

    return {
        onLoad: onLoadHandler
    };
})();

And then use:

NewsCalendar.onLoad();

Anything in the returned {} is public. Anything inside of the surrounding function is accessible only by anything inside of it.

The reason I suggest this setup is because you don't seem to want to instantitate several objects, but instead use it as a library of properties/methods.