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    <p>You can do something like this: <a href="http://jsfiddle.net/g68NP/" rel="nofollow">http://jsfiddle.net/g68NP/</a></p> <p>Problem is that you'll have to add a lot of code to protect every property, every native method, etc. The meat of the code really comes down to using <code>__defineGetter__</code>, whose support is limited. Since you're probably not running this on IE, you should be fine.</p> <p>EDIT: <a href="http://jsfiddle.net/g68NP/1/" rel="nofollow">http://jsfiddle.net/g68NP/1/</a> This code will make all properties read-only. The use of <code>hasOwnProperty()</code> may or may not be desirable.</p> <p>In case JSFiddle goes down:</p> <pre><code>function safeEval(input) { // Remove eval and evalJS from the window: var e = [window.eval, window.evalJS, document.getElementById], a; window.eval = function(){}; window.evalJS = function(){}; document.getElementById = function (id) { var elem = (e[2]).call(document, id); for (var prop in elem) { if (elem.hasOwnProperty(prop)) { elem.__defineGetter__(prop, function () { return (function (val) { return val; }(elem[prop])); }); } } return elem; }; try { /* More sanition needed before being passed to eval */ // Eval the input, stuffed into an annonomous function // so the code to be evalued can not access the stored // eval functions: a = (e[0])("(function(){return " + input + "}())"); } catch(ex){} // Return eval and evalJS to the window: window.eval = e[0]; window.evalJS = e[1]; document.getElementById = e[2]; // Return the eval'd result return a; } </code></pre>
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    1. POSemi-sandboxing Javascript eval
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    1. USJohn Kurlak
    1. USJohn Kurlak
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    1. COIt's not a simple documentQuery. I want any javascript to be accessible/executable, but I do not want that code to alter the window object. Something like `safeEval('8*9')` would be valid.
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    2. CO@SReject How is any JS code not valid in my safeEval? safeEval('8*9') returns 72 just fine. Everything else works just fine too, except for changing the values of properties to elements retrieved by document.getElementById.
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      1. USJohn Kurlak
    3. CO@John What's the point of removing eval()? It is easy to re-implement. Also, if this is FF you probably want to hide Components, since you can use Components.lookupMethod(document, 'getElementById') to get original implementation. Also probably worth adding "use strict" to your function string-interpolation, and also setting the __proto__ of the running function to something like (x={},x.__proto__=null,return x). This won't help you in FF but will certainly prevent some naughty things in chrome.
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      1. USJoe V
 

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