Windows Apps | WinJS.Binding.as returns function in a string mode

Question

I got this Script: 

(function () {

    var app = WinJS.Application;

    
    WinJS.Namespace.define("Example", {

        randsFunction: WinJS.Binding.as ( {

            randNum:function(){

                var num = 0; setInterval(

                    function () {
                        num = Math.floor((Math.random() * 100) + 1);
                    }, 1000)

                return num;
            }
        })
    });

    app.onactivated = function () {

        Example.randsFunction.bind('randNum', function (value) {

       var d = document.getElementById('myDiv');

       d.textContent = value;
       
    })
}

    app.start();

}());

When ran, the content inside the div prints:function () {
var num = 0; setInterval( function () { num = Math.floor((Math.random() * 100) + 1); }, 1000)
return num; }

It seems like WinJS.Binding cannot differentiate between a plain string and/or a function. Or what do you think is the problem? Any suggestion is highly appreciated

Answer 1

I think the problem is that you're expecting it to return a function, when the documentation says it's supposed to return an object:

WinJS.Binding.as function

Returns an observable object. This may be an observable proxy for the specified object, an existing proxy, or the specified object itself if it directly supports observation.

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 2

Thanks alot... but how do i do an

eval()

on that function to make it part of the <script> as a real 

function

and not a mere string??.... Any Idea?... In other words, how do I add a function like:

var myString = "function shout(){ alert('HAHAHAHA'); }"; 

How to add that function in the project so as TO run the alert?.... using WinJS?