StackOverflow2013

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20604105
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0
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2013-12-16T05:32:50.553
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0
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2013-12-16T05:32:50.553
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0
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635766
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17912587
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2
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The problem you are experiencing is the result of confusion about Objects/Classes/Instances in javascript. The critical point for you on this issue is the difference between <code>new game()</code> and <code>game()</code>; <pre><code>var foo = new game() </code></pre> <ul> <li>tells the JS engine to create a new object</li> <li>point that object's Prototype (not <code>prototype</code>) at <code>game</code>'s <code>prototype</code></li> <li>and then invoke the function game, but for the sake of the body of that function <code>this</code> will refer to the created object.</li> <li>If the function doesn't return an object, assign our created object to <code>foo</code> (otherwise assign the function's return value to <code>foo</code></li> </ul> Inside the body of your game function, you have <code>this.cardSelection = function (...</code>. If you simply invoke <code>game</code> as a function, so just <code>game()</code>, without the <code>new</code> keyword, <code>this</code> inside the body of the function will be the window object! So you'll add <code>cardSelection</code> to the window object. Also importantly: <code>game.cardSelection()</code> is looking for a function named <code>cardSelection</code> as a property on the function <code>game</code>. Here's an example of using that style that would work: <pre><code>var foo = function () { //do interesting stuff } foo.bar = function () { //do interesting stuff related to foo } foo.bar(); </code></pre> What you seem to be expecting would need to be written this way: <pre><code>var game = function () { this.cardSelection = function () { //perform card selection! } } var aGame = new game(); aGame.cardSelection(); </code></pre> Or, if <code>cardSelection</code> does not need access to any private properties of the game, it could be written more efficiently as <pre><code>var game = function () { //setup the game }; game.prototype.cardSelection = function () { //perform card selection }; var aGame = new game(); aGame.cardSelection(); </code></pre>
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1. POCustom object 'game' doesn't have specified method
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