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POjQuery's draggable grid
 

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    <p>It looks like that the 'grid' option in the constructor of <a href="http://jqueryui.com/demos/draggable/" rel="nofollow noreferrer">Draggable</a> is relatively bound to the original coordinates of the element being dragged - so simply put, if you have three draggable divs with their <strong>top</strong> set respectively to 100, 200, 254 pixels relative to their parent:</p> <pre><code>&lt;div class="parent-div" style="position: relative;"&gt; &lt;div id="div1" class="draggable" style="top: 100px; position: absolute;"&gt;&lt;/div&gt; &lt;div id="div2" class="draggable" style="top: 200px; position: absolute;"&gt;&lt;/div&gt; &lt;div id="div3" class="draggable" style="top: 254px; position: absolute;"&gt;&lt;/div&gt; &lt;/div&gt; </code></pre> <p>Adn all of them are getting enabled for dragging with 'grid' set to [1, 100]:</p> <pre><code>draggables = $('.draggable'); $.each(draggables, function(index, elem) { $(elem).draggable({ containment: $('#parent-div'), opacity: 0.7, revert: 'invalid', revertDuration: 300, grid: [1, 100], refreshPositions: true }); }); </code></pre> <p>Problem here is that as soon as you drag <strong>div3</strong>, say, down, it's top is increased by 100, moving it to <strong>354px</strong> instead of being increased by just mere <strong>46px</strong> (254 + 46 = 300), which would get it to the next stop in the grid - <strong>300px</strong>, if we are looking at the <strong>parent-div</strong> as a point of reference and "grid holder".</p> <p>I had a look at the draggable sources and it seem to be an in-built flaw - they just do all the calculations relative to the original position of the draggable element.</p> <p>I would like to avoid monkey-patching the code of draggable library and what I am really looking for here is the way how to make the Draggable calculate the grid positions relative to containing parent. However if monkey-patching is unavoidable, I guess I'll have to live with it.</p>
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