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POHow do I trigger a change in JQuery?
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  1. POHow do I trigger a change in JQuery?
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    copied!<p>I'm new to JQuery, so this is probably a very dumb question. </p> <p>I've used JQuery to make the elements in a table draggable. I asked <a href="https://stackoverflow.com/questions/552951/how-can-i-make-my-jquery-draggable-droppable-code-faster">a question</a> about how to make it faster, and the best response I had so far was to disable droppable for all the cells, and only enable them when something is being dragged.</p> <p>Actually, for me, this makes a lot of sense as I only want to be able to drag a cell onto another cell in the same row. So I only need to apply droppable to the cells in the same row. So, I do this:</p> <pre><code>$(document).ready ( function() { $('.draggable_div').draggable ( { addClasses: false, scroll: false, axis: 'x', start: function(event, ui) { $(this).css('background-color','#ddddff'); var $cells = $(this).parent().parent().children(); $cells.addClass("droppable_td"); } } ); ... </code></pre> <p>Firebug is telling me that I've successfully added the "draggable_td" class to the cells in the right row. But how do I make that trigger the change? The way I have the code set up at the moment, droppable is attached like this:</p> <pre><code> $('.droppable_td').droppable ( { addClasses: false, over: function(event, ui) { $(this).css('background-color', '#ccffcc'); }, out: function(event, ui) { $(this).css('background-color', null); }, drop: function(event, ui) { etc... </code></pre> <p>I know that code works, because if I put that class in the appropriate &lt; td> elements in the HTML it all works (just very slowly).</p> <p>In other words: If I have all cells droppable from the start, it works. How can I dynamically change a cell to make it droppable as a result of an event?</p>
 

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