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POjQuery extension and closures
 

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    <p>I'm learning javascript, and in the way I'm trying to learn more about jQuery. I have created a very simple "form controller" in JS, so when I create the object passing the form as parameter, it gets the events wired and hijacks the submit:</p> <pre><code>var FormController = function (form) { // private field var _form = $(form); var _url = _form.attr('action'); var _isValid = false; $(form).submit(function (e) { submitForm(); e.preventDefault(); }); var disableAll = function () { _form.find('select,input,textarea').attr('disabled', 'disabled') }; var enableAll = function () { _form.find('select,input,textarea').removeAttr('disabled') }; var submitForm = function () { disableAll(); _isValid = true; if (_isValid) { $.ajax({ url: _url, type: 'POST', success: function (data, textStatus, jqXHR) { enableAll(); var obj = jQuery.parseJSON(jqXHR.responseText); print(data.Result ? data.Result : "[No Result]"); print(textStatus.toString()); }, error: function (data, textStatus, jqXHR) { print(textStatus); _form.css('border', '1px solid Red'); enableAll(); } }); } }; // public fields and functions return { getIsValid: function () { return _isValid; }, submit: function () { return submitForm(); } }; }; </code></pre> <p>It works as expected. Now I would like to create a jQuery extension, so I can apply that object to the results:</p> <pre><code>$.fn.formController = function () { return this.each(function (i, item) { new FormController(item); }); }; </code></pre> <p>I also works as expected, but... will the GC collect that object? Or because the events are wired, it counts as referenced?</p> <p>Now, I would like to keep the instances of my controllers available, so I can manipulate them after creation, for example for invoking methods. Something like this:</p> <pre><code>$('#myForm').formController('submit'); </code></pre> <p>I have tried several ways to do it, but I cannot get it. I have tried to put a closure with a object that keep track of the items, etc... but I just got mess with "this". </p> <p>What would be the correct way to do this? And I assume that everything I have done so far could be wrong even if it works.</p> <p>Thanks.</p> <p><strong>UPDATE</strong></p> <p>Sorry if the question was not clear enough. What I am aiming for is a way I can do : <code>$('#myForm').formController('submit');</code> , and then the funcion will find the "FormController" object associated with that HTML object, and invoke this "submit" member.</p> <p>I want to achieve something like this:</p> <pre><code>$.fn.formController = function (name) { if(!document._items) document._items = []; if (name) { return this.each(function (i, item) { var id = $(item).data('form-controller'); if (id) { var fc = document._items[id]; var member = fc[name]; if (member) { if (typeof member == 'function') member(); } } }); } else { return this.each(function (i, item) { var id = document._items.push(new FormController(item)) - 1; $(item).data('form-controller', id.toString()); }); } }; </code></pre> <p>The problem in this approach is that I'm keeping a collection as global object, and what I want is make it internal. I have tried with a closure, but I only got into problems with "this" (that points to DOMwindow), or the "_items" var being empty. </p> <p>What would be the correct way to approach this?</p>
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