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POCloning JavaScript Objects. Again :(
 

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  1. POCloning JavaScript Objects. Again :(
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    <p>I know it is really annoying to read this topic again. Before you start diggin into the code, one solution could be that I don't get prototypes and objects in JavaScript. But at this point i think, i do.</p> <p>The problem is:<br> <strong>How to clone an JavaScript Class (created with prototypes), so that the “cloned” Class remains untouched when extending and executing afterwards?</strong></p> <pre><code>function clone(obj){ if(obj == null || typeof(obj) != 'object') return obj; var temp = new obj.constructor(); for(var key in obj) temp[key] = clone(obj[key]); return temp; } var FOO = function() { var myBAR = clone(BAR); myBAR.prototype = jQuery.extend(true, myBAR.prototype, this); // deep cloning twice and extending with this console.log("FOO:", this.name); new myBAR(); }; FOO.prototype = { name: "FOO" }; var BAR = function() { console.log("BAR:", this.name); }; BAR.prototype = { name: "BAR" }; new FOO(); // returns FOO: FOO and BAR: FOO new BAR(); // returns BAR: FOO should return BAR: BAR </code></pre> <p>If i've got it right, the second call of <code>new BAR()</code> (after <code>new FOO()</code>) should return <code>BAR: BAR</code> not <code>BAR: FOO</code> as at the moment.</p> <p>One possible solution for this problem is an complete rewrite of the <code>clone</code> function in something like this:</p> <pre><code>function clone(obj) { return eval("("+obj.toString()+")"); // the same as eval(uneval(obj)); } </code></pre> <p>But this approach has an BIG downside, you can't pass any dynamically created objects.</p> <p>Any ideas?</p>
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    1. USStanislav Müller
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    1. COWhat do you mean by "dynamically created objects"?
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      1. USIonuț G. Stan
    2. COImagine you've created an instance of <code>CAT</code> inside of <code>FOO</code> and saved CAT as property like <code>this.cat = new CAT();</code> And <code>CAT</code> Class has created and saved an reference to an DOM Element. like <code>this.myBody = $("body")</code>.
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      1. POCloning JavaScript Objects. Again :(
      1. USStanislav Müller
    3. COIn your cloning process, when do you want to copy, and when do you want to copy a reference?
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      1. USRojo
 

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