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POHow this and $(this) end up being the same when extending jQuery?
 

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  1. POHow this and $(this) end up being the same when extending jQuery?
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    <p>I'm trying to work with a plugin which extends jQuery like so:</p> <pre><code> $.extend({ StatelessDeferred: function () { var doneList = $.Callbacks("memory"), promise = { done: doneList.add, // Get a promise for this deferred // If obj is provided, the promise aspect is added to the object promise: function (obj) { var i, keys = ['done', 'promise']; if (obj === undefined) { obj = promise; } else { for (i = 0; i &lt; keys.length; i += 1) { obj[keys[i]] = promise[keys[i]]; } } return obj; } }, deferred = promise.promise({}); deferred.resolveWith = doneList.fireWith; return deferred; } }); </code></pre> <p>Problem is (and I'm not even sure it's caused here), after the callback loads, inside a <code>done</code> callback, both <code>this</code> and <code>$(this)</code> are the same, so I end up for example with: <code>this === $(this) === $(document)</code>.</p> <p>I'm not really sure I understand what's being extended. The plugin works fine with it except for the false assignment.</p> <p><strong>Question:</strong><br> Could the above extension be causing <code>this === $(this) === $(document)</code>? </p> <p><strong>EDIT</strong>: Full plugin (120lines):</p> <pre><code>"use strict"; (function (window, $) { $.extend({ StatelessDeferred: function () { var doneList = $.Callbacks("memory"), promise = { done: doneList.add, // Get a promise for this deferred // If obj is provided, the promise aspect is added to the object promise: function (obj) { var i, keys = ['done', 'promise']; if (obj === undefined) { obj = promise; } else { for (i = 0; i &lt; keys.length; i += 1) { obj[keys[i]] = promise[keys[i]]; } } return obj; } }, deferred = promise.promise({}); deferred.resolveWith = doneList.fireWith; // All done! return deferred; } }); var routes = [], current_priority = 0, methods = { add: function (pattern, priority) { var i = 0, inserted = false, length = routes.length, dfr = $.StatelessDeferred(), context = $(this), escapepattern, matchingpattern; if (priority === undefined) { priority = 0; } if (pattern !== undefined) { // http://simonwillison.net/2006/Jan/20/escape/ escapepattern = pattern.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, "\\$&amp;"); matchingpattern = escapepattern .replace(/&lt;int:\w+&gt;/g, "(\\d+)") .replace(/&lt;path:\w+&gt;/g, "(.+)") .replace(/&lt;\w+&gt;/g, "([^/]+)"); while (!inserted) { if ((i === length) || (priority &gt;= routes[i][2])) { routes.splice(i, 0, [new RegExp('^' + matchingpattern + '$'), dfr, priority, context]); inserted = true; } else { i += 1; } } } return dfr.promise(); }, go: function (path, min_priority) { var dfr = $.Deferred(), context = $(this), result; if (min_priority === undefined) { min_priority = 0; } setTimeout(function () { var i = 0, found = false, slice_index = -1, slice_priority = -1; for (i = 0; i &lt; routes.length; i += 1) { if (slice_priority !== routes[i][2]) { slice_priority = routes[i][2]; slice_index = i; } if (routes[i][2] &lt; min_priority) { break; } else if (routes[i][0].test(path)) { result = routes[i][0].exec(path); dfr = routes[i][1]; context = routes[i][3]; current_priority = routes[i][2]; found = true; break; } } if (i === routes.length) { slice_index = i; } if (slice_index &gt; -1) { routes = routes.slice(slice_index); } if (found) { dfr.resolveWith( context, result.slice(1) ); } else { dfr.rejectWith(context); } }); return dfr.promise(); }, }; $.routereset = function () { routes = []; current_priority = 0; }; $.routepriority = function () { return current_priority; }; $.fn.route = function (method) { var result; if (methods.hasOwnProperty(method)) { result = methods[method].apply( this, Array.prototype.slice.call(arguments, 1) ); } else { $.error('Method ' + method + ' does not exist on jQuery.route'); } return result; }; }(window, jQuery)); </code></pre> <p>So I can use this as a router and set a route like so:</p> <pre><code> $(".element").add("route", "/foo/bar/&lt;path:params&gt;", 2).done(function(params){ // do something, for example console.log(this); console.log($(this)); console.log("which will be the same = $('.element')); }); </code></pre> <p>Hope it's more clear now.</p> <p>Thanks for having a look.</p>
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    1. COIt is impossible for `$(this)` to be `===` to `$(document)`, since those are objects that are the results of function calls.
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    2. COLet me add some code. 1min.
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    3. COSure. Are you using a plugin that caches collections by any chance?
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      1. USAsad Saeeduddin
 

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