jquery.form.js

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        // take a breath so that pending repaints get some cpu time before the upload starts
        setTimeout(function() {
            // make sure form attrs are set
            var encAttr = form.encoding ? 'encoding' : 'enctype';
            var t = $form.attr('target');
            $form.attr({
                target:   id,
                method:  'POST',
                action:   opts.url
            });
            form[encAttr] = 'multipart/form-data';

            // support timout
            if (opts.timeout)
                setTimeout(function() { timedOut = true; cb(); }, opts.timeout);

            // add iframe to doc and submit the form
            $io.appendTo('body');
            io.attachEvent ? io.attachEvent('onload', cb) : io.addEventListener('load', cb, false);
            form.submit();
            $form.attr('target', t); // reset target
        }, 10);

        function cb() {
            if (cbInvoked++) return;

            io.detachEvent ? io.detachEvent('onload', cb) : io.removeEventListener('load', cb, false);

            var ok = true;
            try {
                if (timedOut) throw 'timeout';
                // extract the server response from the iframe
                var data, doc;
                doc = io.contentWindow ? io.contentWindow.document : io.contentDocument ? io.contentDocument : io.document;
                xhr.responseText = doc.body ? doc.body.innerHTML : null;
                xhr.responseXML = doc.XMLDocument ? doc.XMLDocument : doc;

                if (opts.dataType == 'json' || opts.dataType == 'script') {
                    var ta = doc.getElementsByTagName('textarea')[0];
                    data = ta ? ta.value : xhr.responseText;
                    if (opts.dataType == 'json')
                        eval("data = " + data);
                    else
                        $.globalEval(data);
                }
                else if (opts.dataType == 'xml') {
                    data = xhr.responseXML;
                    if (!data && xhr.responseText != null)
                        data = toXml(xhr.responseText);
                }
                else {
                    data = xhr.responseText;
                }
            }
            catch(e){
                ok = false;
                $.handleError(opts, xhr, 'error', e);
            }

            // ordering of these callbacks/triggers is odd, but that's how $.ajax does it
            if (ok) {
                opts.success(data, 'success');
                if (g) $.event.trigger("ajaxSuccess", [xhr, opts]);
            }
            if (g) $.event.trigger("ajaxComplete", [xhr, opts]);
            if (g && ! --$.active) $.event.trigger("ajaxStop");
            if (opts.complete) opts.complete(xhr, ok ? 'success' : 'error');

            // clean up
            setTimeout(function() {
                $io.remove();
                xhr.responseXML = null;
            }, 100);
        };

        function toXml(s, doc) {
            if (window.ActiveXObject) {
                doc = new ActiveXObject('Microsoft.XMLDOM');
                doc.async = 'false';
                doc.loadXML(s);
            }
            else
                doc = (new DOMParser()).parseFromString(s, 'text/xml');
            return (doc && doc.documentElement && doc.documentElement.tagName != 'parsererror') ? doc : null;
        };
    };
};
$.fn.ajaxSubmit.counter = 0; // used to create unique iframe ids

/**
 * ajaxForm() provides a mechanism for fully automating form submission.
 *
 * The advantages of using this method instead of ajaxSubmit() are:
 *
 * 1: This method will include coordinates for <input type="image" /> elements (if the element
 *    is used to submit the form).
 * 2. This method will include the submit element's name/value data (for the element that was
 *    used to submit the form).
 * 3. This method binds the submit() method to the form for you.
 *
 * Note that for accurate x/y coordinates of image submit elements in all browsers
 * you need to also use the "dimensions" plugin (this method will auto-detect its presence).
 *
 * The options argument for ajaxForm works exactly as it does for ajaxSubmit.  ajaxForm merely
 * passes the options argument along after properly binding events for submit elements and
 * the form itself.  See ajaxSubmit for a full description of the options argument.
 *
 *
 * @example
 * var options = {
 *     target: '#myTargetDiv'
 * };
 * $('#myForm').ajaxSForm(options);
 * @desc Bind form's submit event so that 'myTargetDiv' is updated with the server response
 *       when the form is submitted.
 *
 *
 * @example
 * var options = {
 *     success: function(responseText) {
 *         alert(responseText);
 *     }
 * };
 * $('#myForm').ajaxSubmit(options);
 * @desc Bind form's submit event so that server response is alerted after the form is submitted.
 *
 *
 * @example
 * var options = {
 *     beforeSubmit: function(formArray, jqForm) {
 *         if (formArray.length == 0) {
 *             alert('Please enter data.');
 *             return false;
 *         }
 *     }
 * };
 * $('#myForm').ajaxSubmit(options);
 * @desc Bind form's submit event so that pre-submit callback is invoked before the form
 *       is submitted.
 *
 *
 * @name   ajaxForm
 * @param  options  object literal containing options which control the form submission process
 * @return jQuery
 * @cat    Plugins/Form
 * @type   jQuery
 */
$.fn.ajaxForm = function(options) {
    return this.ajaxFormUnbind().submit(submitHandler).each(function() {
        // store options in hash
        this.formPluginId = $.fn.ajaxForm.counter++;
        $.fn.ajaxForm.optionHash[this.formPluginId] = options;
        $(":submit,input:image", this).click(clickHandler);
    });
};

$.fn.ajaxForm.counter = 1;
$.fn.ajaxForm.optionHash = {};

function clickHandler(e) {
    var $form = this.form;
    $form.clk = this;
    if (this.type == 'image') {
        if (e.offsetX != undefined) {
            $form.clk_x = e.offsetX;
            $form.clk_y = e.offsetY;
        } else if (typeof $.fn.offset == 'function') { // try to use dimensions plugin
            var offset = $(this).offset();
            $form.clk_x = e.pageX - offset.left;
            $form.clk_y = e.pageY - offset.top;
        } else {
            $form.clk_x = e.pageX - this.offsetLeft;
            $form.clk_y = e.pageY - this.offsetTop;
        }
    }
    // clear form vars
    setTimeout(function() { $form.clk = $form.clk_x = $form.clk_y = null; }, 10);
};

function submitHandler() {
    // retrieve options from hash
    var id = this.formPluginId;
    var options = $.fn.ajaxForm.optionHash[id];
    $(this).ajaxSubmit(options);
    return false;
};

/**
 * ajaxFormUnbind unbinds the event handlers that were bound by ajaxForm
 *
 * @name   ajaxFormUnbind
 * @return jQuery
 * @cat    Plugins/Form
 * @type   jQuery
 */
$.fn.ajaxFormUnbind = function() {
    this.unbind('submit', submitHandler);
    return this.each(function() {
        $(":submit,input:image", this).unbind('click', clickHandler);
    });

};

/**
 * formToArray() gathers form element data into an array of objects that can
 * be passed to any of the following ajax functions: $.get, $.post, or load.
 * Each object in the array has both a 'name' and 'value' property.  An example of
 * an array for a simple login form might be:
 *
 * [ { name: 'username', value: 'jresig' }, { name: 'password', value: 'secret' } ]
 *
 * It is this array that is passed to pre-submit callback functions provided to the
 * ajaxSubmit() and ajaxForm() methods.
 *
 * The semantic argument can be used to force form serialization in semantic order.
 * This is normally true anyway, unless the form contains input elements of type='image'.
 * If your form must be submitted with name/value pairs in semantic order and your form
 * contains an input of type='image" then pass true for this arg, otherwise pass false
 * (or nothing) to avoid the overhead for this logic.
 *
 * @example var data = $("#myForm").formToArray();
 * $.post( "myscript.cgi", data );
 * @desc Collect all the data from a form and submit it to the server.
 *
 * @name formToArray
 * @param semantic true if serialization must maintain strict semantic ordering of elements (slower)
 * @type Array<Object>
 * @cat Plugins/Form
 */
$.fn.formToArray = function(semantic) {
    var a = [];
    if (this.length == 0) return a;

    var form = this[0];
    var els = semantic ? form.getElementsByTagName('*') : form.elements;
    if (!els) return a;
    for(var i=0, max=els.length; i < max; i++) {
        var el = els[i];
        var n = el.name;
        if (!n) continue;

        if (semantic && form.clk && el.type == "image") {
            // handle image inputs on the fly when semantic == true
            if(!el.disabled && form.clk == el)
                a.push({name: n+'.x', value: form.clk_x}, {name: n+'.y', value: form.clk_y});
            continue;
        }

        var v = $.fieldValue(el, true);
        if (v && v.constructor == Array) {
            for(var j=0, jmax=v.length; j < jmax; j++)
                a.push({name: n, value: v[j]});
        }
        else if (v !== null && typeof v != 'undefined')
            a.push({name: n, value: v});
    }

    if (!semantic && form.clk) {
        // input type=='image' are not found in elements array! handle them here
        var inputs = form.getElementsByTagName("input");
        for(var i=0, max=inputs.length; i < max; i++) {
            var input = inputs[i];
            var n = input.name;
            if(n && !input.disabled && input.type == "image" && form.clk == input)
                a.push({name: n+'.x', value: form.clk_x}, {name: n+'.y', value: form.clk_y});
        }
    }
    return a;
};


/**
 * Serializes form data into a 'submittable' string. This method will return a string
 * in the format: name1=value1&amp;name2=value2
 *
 * The semantic argument can be used to force form serialization in semantic order.
 * If your form must be submitted with name/value pairs in semantic order then pass
 * true for this arg, otherwise pass false (or nothing) to avoid the overhead for
 * this logic (which can be significant for very large forms).
 *
 * @example var data = $("#myForm").formSerialize();
 * $.ajax('POST', "myscript.cgi", data);
 * @desc Collect all the data from a form into a single string
 *
 * @name formSerialize
 * @param semantic true if serialization must maintain strict semantic ordering of elements (slower)
 * @type String
 * @cat Plugins/Form
 */
$.fn.formSerialize = function(semantic) {
    //hand off to jQuery.param for proper encoding