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POMerge json-object and populate next/prev items
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17677311
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2013-07-16T13:04:25.277
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2013-07-16T14:12:55.483
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2017-05-23T11:49:12.920
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Body
How can I pre-populate an JSON-Object which contains some css-properties. Where I need to add all not-contained properties to the previous object and the same for all next up items? The statement I need: <pre><code>if (property is not in object) object[property] = $('.foo').css(property); </code></pre> We have for example an element with the following styling: <pre><code>.foo { top: 0; width: 100px; } </code></pre> And the following <code>keyframe</code>-alike object: <pre><code>var keyframe = { 0: { top: 0 }, 1000: { top: 100 }, 2000: { width: 100 } }; </code></pre> Here we need to populate all previous items, in this case: <ul> <li><code>0: width = 0</code></li> <li><code>1000: width = 0</code></li> </ul> ...we get something like this: <pre><code>var keyframe = { 0: { top: 0, width: 0 }, 1000: { top: 100, width: 0 }, 2000: { top: 100, width: 100 } }; </code></pre> ...and further, we need to prefill all next items: <ul> <li><code>2000: top = 100</code></li> </ul> What results in: <pre><code>var keyframe = { 0: { top: 0 }, 1000: { top: 100 }, 2000: { top: 100, width: 100 } }; </code></pre> Our final object needs to be like this one: <pre><code>var keyframe = { 0: { top: 0, width: 0 }, 1000: { top: 100, width: 0 }, 2000: { top: 100, width: 100 } }; </code></pre> <h3>Update</h3> <a href="https://stackoverflow.com/a/17677380/1250044">T.J. Crowder answer</a> looks good so far, however the problem is that I don't know what properties are in the <code>keyframe</code>-object... So it can be, that there are more/other properties in the keyframe than <code>width</code> and <code>top</code>. <h2>Update2</h2> Currently I've the following: <pre><code>var $foo = $('.foo'); for (var key in keyframe) { var obj = keyframe[key]; for(var ok in obj) { if (!(ok in obj)) obj[ok] = $foo.css(ok); } } </code></pre> But it seems that <pre><code>if (!(ok in obj)) // is always `truthy` </code></pre> however if I do it by declaring it directly <pre><code>if (!('top' in obj)) // it works... </code></pre> Any ideas?
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<javascript><json><object><for-loop><keyframe>
Title
Merge json-object and populate next/prev items
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