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PO"eval is evil", but do I have an option?
 

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  1. PO"eval is evil", but do I have an option?
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    <p>I've came up with some custom localization solution for a project I'm working on. The idea is that my HTML can contain this:</p> <pre><code>&lt;h2 data-l10n="HELLO" data-l10n-params="['Visitor', new Date()]"&gt;&lt;/h2&gt; </code></pre> <p>When the page is initiated a javascript function like this runs:</p> <pre><code>localizeAll: function(sel) { var selector = sel || document, $o = $(selector); $o.find('[data-l10n]').each( function() { var $t = $(this), val = $t.attr('data-l10n'), params = $t.attr('data-l10n-params'), po = null; if (typeof params !== 'undefined') { po = eval(params); log(params, po); } var res = doLocalize(val, po); if (res[0] !== '&lt;') { $t.text(res); } else { $t.text(val); } }); } </code></pre> <p>So basically we search for any elements that have a <code>data-l10n</code>-attribute and call <code>doLocalize()</code> for each of those objects. Additionally, the element can have a <code>data-l10n-params</code>-attribute, which is just a string literal that can be parsed to an array. This string is evaluated (<code>params</code> string becomes <code>po</code> array) and <code>po</code> is supplied to <code>doLocalize()</code> as the optional second parameter. </p> <p>Hence, the output in Firebug (from <code>log(params, po);</code> statement) is:</p> <pre><code>['Vistor', new Date()] ["Vistor", Date {Thu Nov 17 2011 10:10:31 GMT+0100 (CET)}] </code></pre> <p>So yes, I'm using eval. And yes, I know that "eval is evil". But occasionally, I need to pass a parameter to <code>doLocalize()</code>.</p> <p>How could this be done without eval?</p>
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    1. USTomasz Nurkiewicz
    1. USJacob
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    1. COVery interesting solution. I'm wondering why you've done it like this. This way, the html kind of tells the JS what to do, instead of the JS completing the html. I feel the two should be more separated, which would also make your HTML valid (now it's not). So, is there a special reason for this approach?
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      1. PO"eval is evil", but do I have an option?
      1. USkasimir
    2. CO@kasimir: If you mean the `data-` attributes then they are actually valid in HTML5.
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      1. PO"eval is evil", but do I have an option?
      1. USTomasz Nurkiewicz
    3. CO@TomaszNurkiewicz: thanks for pointing that out, I forgot about that.
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      1. PO"eval is evil", but do I have an option?
      1. USkasimir
 

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