/*
 * jQuery Form Plugin
 * version: 2.12 (06/07/2008)
 */
(function($) {

$.fn.ajaxSubmit = function(options) {
    // fast fail if nothing selected (http://dev.jquery.com/ticket/2752)
    if (!this.length) {
        log('ajaxSubmit: skipping submit process - no element selected');
        return this;
    }

    if (typeof options == 'function')
        options = { success: options };

    options = $.extend({
        url:  this.attr('action') || window.location.toString(),
        type: this.attr('method') || 'GET'
    }, options || {});

    var veto = {};
    this.trigger('form-pre-serialize', [this, options, veto]);
    if (veto.veto) {
        log('ajaxSubmit: submit vetoed via form-pre-serialize trigger');
        return this;
   }

    var a = this.formToArray(options.semantic);
    if (options.data) {
        options.extraData = options.data;
        for (var n in options.data)
            a.push( { name: n, value: options.data[n] } );
    }

    // give pre-submit callback an opportunity to abort the submit
    if (options.beforeSubmit && options.beforeSubmit(a, this, options) === false) {
        log('ajaxSubmit: submit aborted via beforeSubmit callback');
        return this;
    }    

    // fire vetoable 'validate' event
    this.trigger('form-submit-validate', [a, this, options, veto]);
    if (veto.veto) {
        log('ajaxSubmit: submit vetoed via form-submit-validate trigger');
        return this;
    }    

    var q = $.param(a);

    if (options.type.toUpperCase() == 'GET') {
        options.url += (options.url.indexOf('?') >= 0 ? '&' : '?') + q;
        options.data = null;  // data is null for 'get'
    }
    else
        options.data = q; // data is the query string for 'post'

    var $form = this, callbacks = [];
    if (options.resetForm) callbacks.push(function() { $form.resetForm(); });
    if (options.clearForm) callbacks.push(function() { $form.clearForm(); });

    // perform a load on the target only if dataType is not provided
    if (!options.dataType && options.target) {
        var oldSuccess = options.success || function(){};
        callbacks.push(function(data) {
            $(options.target).html(data).each(oldSuccess, arguments);
        });
    }
    else if (options.success)
        callbacks.push(options.success);

    options.success = function(data, status) {
        for (var i=0, max=callbacks.length; i < max; i++)
            callbacks[i](data, status, $form);
    };

    // are there files to upload?
    var files = $('input:file', this).fieldValue();
    var found = false;
    for (var j=0; j < files.length; j++)
        if (files[j])
            found = true;

   if (options.iframe || found) { 
       if ($.browser.safari && options.closeKeepAlive)
           $.get(options.closeKeepAlive, fileUpload);
       else
           fileUpload();
       }
   else
       $.ajax(options);

    // fire 'notify' event
    this.trigger('form-submit-notify', [this, options]);
    return this;


    // private function for handling file uploads (hat tip to YAHOO!)
    function fileUpload() {
        var form = $form[0];
        
        if ($(':input[@name=submit]', form).length) {
            alert('Error: Form elements must not be named "submit".');
            return;
        }
        
        var opts = $.extend({}, $.ajaxSettings, options);

        var id = 'jqFormIO' + (new Date().getTime());
        var $io = $('<iframe id="' + id + '" name="' + id + '" />');
        var io = $io[0];

        if ($.browser.msie || $.browser.opera) 
            io.src = 'javascript:false;document.write("");';
        $io.css({ position: 'absolute', top: '-1000px', left: '-1000px' });

        var xhr = { // mock object
            responseText: null,
            responseXML: null,
            status: 0,
            statusText: 'n/a',
            getAllResponseHeaders: function() {},
            getResponseHeader: function() {},
            setRequestHeader: function() {}
        };

        var g = opts.global;
        // trigger ajax global events so that activity/block indicators work like normal
        if (g && ! $.active++) $.event.trigger("ajaxStart");
        if (g) $.event.trigger("ajaxSend", [xhr, opts]);

        var cbInvoked = 0;
        var timedOut = 0;

        // add submitting element to data if we know it
        var sub = form.clk;
        if (sub) {
            var n = sub.name;
            if (n && !sub.disabled) {
                options.extraData = options.extraData || {};
                options.extraData[n] = sub.value;
                if (sub.type == "image") {
                    options.extraData[name+'.x'] = form.clk_x;
                    options.extraData[name+'.y'] = form.clk_y;
                }
            }
        }
        
        // take a breath so that pending repaints get some cpu time before the upload starts
        setTimeout(function() {
            // make sure form attrs are set
            var t = $form.attr('target'), a = $form.attr('action');
            $form.attr({
                target:   id,
                encoding: 'multipart/form-data',
                enctype:  'multipart/form-data',
                method:   'POST',
                action:   opts.url
            });

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

            // add "extra" data to form if provided in options
            var extraInputs = [];
            try {
                if (options.extraData)
                    for (var n in options.extraData)
                        extraInputs.push(
                            $('<input type="hidden" name="'+n+'" value="'+options.extraData[n]+'" />')
                                .appendTo(form)[0]);
            
                // add iframe to doc and submit the form
                $io.appendTo('body');
                io.attachEvent ? io.attachEvent('onload', cb) : io.addEventListener('load', cb, false);
                form.submit();
            }
            finally {
                // reset attrs and remove "extra" input elements
                $form.attr('action', a);
                t ? $form.attr('target', t) : $form.removeAttr('target');
                $(extraInputs).remove();
            }
        }, 10);

        function cb() {
            if (cbInvoked++) return;
            
            io.detachEvent ? io.detachEvent('onload', cb) : io.removeEventListener('load', cb, false);

            var operaHack = 0;
            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;
                
                if (doc.body == null && !operaHack && $.browser.opera) {
                    // In Opera 9.2.x the iframe DOM is not always traversable when
                    // the onload callback fires so we give Opera 100ms to right itself
                    operaHack = 1;
                    cbInvoked--;
                    setTimeout(cb, 100);
                    return;
                }
                
                xhr.responseText = doc.body ? doc.body.innerHTML : null;
                xhr.responseXML = doc.XMLDocument ? doc.XMLDocument : doc;
                xhr.getResponseHeader = function(header){
                    var headers = {'content-type': opts.dataType};
                    return headers[header];
                };

                if (opts.dataType == 'json' || opts.dataType == 'script') {
                    var ta = doc.getElementsByTagName('textarea')[0];
                    xhr.responseText = ta ? ta.value : xhr.responseText;
                }
                else if (opts.dataType == 'xml' && !xhr.responseXML && xhr.responseText != null) {
                    xhr.responseXML = toXml(xhr.responseText);
                }
                data = $.httpData(xhr, opts.dataType);
            }
            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.ajaxForm = function(options) {
    return this.ajaxFormUnbind().bind('submit.form-plugin',function() {
        $(this).ajaxSubmit(options);
        return false;
    }).each(function() {
        // store options in hash
        $(":submit,input:image", this).bind('click.form-plugin',function(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);
        });
    });
};

// ajaxFormUnbind unbinds the event handlers that were bound by ajaxForm
$.fn.ajaxFormUnbind = function() {
    this.unbind('submit.form-plugin');
    return this.each(function() {
        $(":submit,input:image", this).unbind('click.form-plugin');
    });

};

$.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;
};

$.fn.formSerialize = function(semantic) {
    return $.param(this.formToArray(semantic));
};

$.fn.fieldSerialize = function(successful) {
    var a = [];
    this.each(function() {
        var n = this.name;
        if (!n) return;
        var v = $.fieldValue(this, successful);
        if (v && v.constructor == Array) {
            for (var i=0,max=v.length; i < max; i++)
                a.push({name: n, value: v[i]});
        }
        else if (v !== null && typeof v != 'undefined')
            a.push({name: this.name, value: v});
    });
    //hand off to jQuery.param for proper encoding
    return $.param(a);
};


$.fn.fieldValue = function(successful) {
    for (var val=[], i=0, max=this.length; i < max; i++) {
        var el = this[i];
        var v = $.fieldValue(el, successful);
        if (v === null || typeof v == 'undefined' || (v.constructor == Array && !v.length))
            continue;
        v.constructor == Array ? $.merge(val, v) : val.push(v);
    }
    return val;
};

$.fieldValue = function(el, successful) {
    var n = el.name, t = el.type, tag = el.tagName.toLowerCase();
    if (typeof successful == 'undefined') successful = true;

    if (successful && (!n || el.disabled || t == 'reset' || t == 'button' ||
        (t == 'checkbox' || t == 'radio') && !el.checked ||
        (t == 'submit' || t == 'image') && el.form && el.form.clk != el ||
        tag == 'select' && el.selectedIndex == -1))
            return null;

    if (tag == 'select') {
        var index = el.selectedIndex;
        if (index < 0) return null;
        var a = [], ops = el.options;
        var one = (t == 'select-one');
        var max = (one ? index+1 : ops.length);
        for(var i=(one ? index : 0); i < max; i++) {
            var op = ops[i];
            if (op.selected) {
                // extra pain for IE...
                var v = $.browser.msie && !(op.attributes['value'].specified) ? op.text : op.value;
                if (one) return v;
                a.push(v);
            }
        }
        return a;
    }
    return el.value;
};

$.fn.clearForm = function() {
    return this.each(function() {
        $('input,select,textarea', this).clearFields();
    });
};

/**
 * Clears the selected form elements.
 */
$.fn.clearFields = $.fn.clearInputs = function() {
    return this.each(function() {
        var t = this.type, tag = this.tagName.toLowerCase();
        if (t == 'text' || t == 'password' || tag == 'textarea')
            this.value = '';
        else if (t == 'checkbox' || t == 'radio')
            this.checked = false;
        else if (tag == 'select')
            this.selectedIndex = -1;
    });
};

$.fn.resetForm = function() {
    return this.each(function() {
        if (typeof this.reset == 'function' || (typeof this.reset == 'object' && !this.reset.nodeType))
            this.reset();
    });
};

$.fn.enable = function(b) { 
    if (b == undefined) b = true;
    return this.each(function() { 
        this.disabled = !b 
    });
};

$.fn.select = function(select) {
    if (select == undefined) select = true;
    return this.each(function() { 
        var t = this.type;
        if (t == 'checkbox' || t == 'radio')
            this.checked = select;
        else if (this.tagName.toLowerCase() == 'option') {
            var $sel = $(this).parent('select');
            if (select && $sel[0] && $sel[0].type == 'select-one') {
                // deselect all other options
                $sel.find('option').select(false);
            }
            this.selected = select;
        }
    });
};

function log() {
    if ($.fn.ajaxSubmit.debug && window.console && window.console.log)
        window.console.log('[jquery.form] ' + Array.prototype.join.call(arguments,''));
};

})(jQuery);
