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POJSLint "eval is evil." alternatives
 

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    <p>I am have some JavaScript functions that run on both the client (browser) and the server (within a Java Rhino context). These are small functions - basically little validators that are well defined and don't rely upon globals or closures - self-contained and portable.</p> <p>Here's an example:</p> <pre><code>function validPhoneFormat(fullObject, value, params, property) { var phonePattern = /^\+?([0-9\- \(\)])*$/; if (value &amp;&amp; value.length &amp;&amp; !phonePattern.test(value)) return [ {"policyRequirement": "VALID_PHONE_FORMAT"}]; else return []; } </code></pre> <p>To keep things DRY, my server code gets a handle on each of these functions and calls toString() on them, returning them to the browser as part of a JSON object. Something like this:</p> <pre><code> { "name" : "phoneNumber", "policies" : [ { "policyFunction" : "\nfunction validPhoneFormat(fullObject, value, params, property) {\n var phonePattern = /^\\+?([0-9\\- \\(\\)])*$/;\n if (value &amp;&amp; value.length &amp;&amp; !phonePattern.test(value)) {\n return [{\"policyRequirement\":\"VALID_PHONE_FORMAT\"}];\n } else {\n return [];\n }\n}\n" } ] } </code></pre> <p>My browser JS code then takes this response and creates an instance of this function in that context, like so:</p> <pre><code>eval("var policyFunction = " + this.policies[j].policyFunction); policyFailures = policyFunction.call(this, form2js(this.input.closest("form")[0]), this.input.val(), params, this.property.name)); </code></pre> <p>This all works very well. However, I then run this code through JSLint, and I get back this message: </p> <p><em>[ERROR] ValidatorsManager.js:142:37:eval is evil.</em></p> <p>I appreciate that often, eval can be dangerous. However, I have no idea how else I could implement such a mechanism without using it. Is there any way I can do this and also pass through the JSLint validator?</p>
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    1. COIt may just be my lack of experience with such a set-up, but can't you just use the same source in two places?
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    2. CO@Jasper sadly, no - the system isn't setup to really allow me to read the source files directly from both environments.
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    3. COWell, I'd either look into the possibility of changing the setup so that you can, or just deploying the same file in two places (even a link from one to the other could work)
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