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    <p>-- REWRITTEN ANSWER --</p> <p>My opinion:</p> <p>One of the advantages when using jquery <code>data()</code> is that you can <strong>store your data in a very structured manner</strong>. Although <code>data()</code> can be manipulated from outside you can use the plugin in a <em>class-like</em> way, where you have your values stored <em>lets say</em> inside the object.</p> <p>On the other hand using <code>[data-]</code> attributes opens up interesting possibilities when you want to manipulate the data from outside using the DOM, e.g. when inserting elements with a <em>prepared</em> attribute value or want other scripts to change values etc..</p> <p>That said, <strong>using the <code>[data-]</code> attribute as storage does not necessarily require having an interface like yours where you have to use the attribute value as selector to change states for those elements</strong>. This is a crucial difference in how you apply a plugin. As you parse the DOM again to find out which elements have a specific state, it may have a huge impact on performance - e.g. when imagining a spreadsheet like web application with large amounts of affected cells.</p> <p>The following is an <strong>example</strong> for a plugin interface which can perform those tasks much better in my eyes. Further more it demonstrates the usage of data as internal storage:</p> <pre><code>(function($){ var defaults = { //... }; var methods = { init : function(options){ var properties = $.extend(true, {}, defaults, options); return this.each(function(){ var $element = $(this); var data = $element.data('foo'); //... if (!data) { $(this).data('foo', { 'properties' : properties //... }); //... methods._bind.apply(this, []); } }); }, '_bind' : function(){ var $element = $(this); $element.data('foo', $.extend(true, {}, $element.data('foo'), { //... })); //... }, '_unbind' : function(){ var $element = $(this); $element.data('foo', $.extend(true, {}, $element.data('foo'), { //... })); //... }, 'add' : function(){ return this.each(function(){ //... methods._bind.apply(this, []); }); }, 'remove' : function(){ return this.each(function(){ //... methods._unbind.apply(this, []); }); } }; $.fn.foo = function(arg){ if (arg) { if (typeof arg === 'string') { if (arg.indexOf('_') === 0) { arg = ''; } if (methods[arg]) { return methods[arg].apply(this, Array.prototype.slice.call(arguments, 1)); } } } return methods.init.apply(this, arguments); }; })(jQuery); </code></pre> <p>So you can then use it like this:</p> <pre><code>$xl = $('.xl'); $xl.excelify('add'); $xl.excelify('remove'); </code></pre> <p>Or even a toggle (not implemented in the above code example):</p> <pre><code>$xlLike.excelify(); </code></pre>
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    1. POjQuery plugin and storing state of page elements
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    1. COCould you explain where is the advantage of data() over attr()? I cant see that from your code. Btw, you can see my plugin implementation in the fiddle I've linked.
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    2. CORegarding your question and the more or less comprehensible downvote to my original answer I have rewritten it to make clear what before existed only in my thoughts but was not written down here... ;)
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    3. COCould those downvoting my answer please explain why?
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