// SpryUtils.js - version 0.3 - Spry Pre-Release 1.6.1
//
// Copyright (c) 2007. Adobe Systems Incorporated.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of Adobe Systems Incorporated nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

var Spry; if (!Spry) Spry = {}; if (!Spry.Utils) Spry.Utils = {};


Spry.Utils.submitForm = function(form, callback, opts)
{
	if (!form)
		return true;

	if ( typeof form == 'string' )
		form = Spry.$(form) || document.forms[form];

	var frmOpts = {};
	frmOpts.method = form.getAttribute('method');
	frmOpts.url = form.getAttribute('action') || document.location.href;
	frmOpts.enctype = form.getAttribute('enctype');

	Spry.Utils.setOptions(frmOpts, opts);

	var submitData = Spry.Utils.extractParamsFromForm(form, frmOpts.elements);
	if (frmOpts.additionalData)
		submitData += "&" + frmOpts.additionalData;

	if (!frmOpts.enctype || frmOpts.enctype.toLowerCase() != 'multipart/form-data')
	{
		// Ajax submission of a form doesn't work for multipart/form-data!
		frmOpts.method = (frmOpts.method && frmOpts.method.toLowerCase() == "post") ? 'POST' : 'GET';
		if (frmOpts.method == "GET")
		{
			// Data will be submitted in the url.
			if (frmOpts.url.indexOf('?') == -1)
				frmOpts.url += '?';
			else
				frmOpts.url += '&';
			frmOpts.url += submitData;
		}
		else
		{
			// Send Content-Type header.
			if (!frmOpts.headers) frmOpts.headers = {};
			if (!frmOpts.headers['Content-Type'] || frmOpts.headers['Content-Type'].indexOf("application/x-www-form-urlencoded") ==-1 )
				frmOpts.headers['Content-Type'] = 'application/x-www-form-urlencoded';

			// Set the postData
			frmOpts.postData = submitData;
		}

		Spry.Utils.loadURL(frmOpts.method, frmOpts.url, true, callback, frmOpts);
		return false;
	}

	// Native submission when 'multipart/form-data' is used.
	return true;
};


Spry.Utils.extractParamsFromForm = function (form, elements)
{
	if (!form)
		return '';

	if ( typeof form == 'string' )
		form = document.getElementById(form) || document.forms[form];

	var formElements;
	if (elements)
		formElements = ',' + elements.join(',') + ',';

	var compStack = new Array(); // key=value pairs

	var el;
	for (var i = 0; i < form.elements.length; i++ )
	{
		el = form.elements[i];
		if (el.disabled || !el.name)
		{
			// Don't submit disabled elements.
			// Don't submit elements without name.
			continue;
		}

		if (!el.type)
		{
			// It seems that this element doesn't have a type set,
			// so skip it.
			continue;
		}

		if (formElements && formElements.indexOf(',' + el.name + ',')==-1)
			continue;

		switch(el.type.toLowerCase())
		{
			case 'text':
			case 'password':
			case 'textarea':
			case 'hidden':
			case 'submit':
				compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(el.value));
				break;
			case 'select-one':
				var value = '';
				var opt;
				if (el.selectedIndex >= 0) {
					opt = el.options[el.selectedIndex];
					value = opt.value || opt.text;
				}
				compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(value));
				break;
			case 'select-multiple':
				for (var j = 0; j < el.length; j++)
				{
					if (el.options[j].selected)
					{
						value = el.options[j].value || el.options[j].text;
						compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(value));
					}
				}
				break;
			case 'checkbox':
			case 'radio':
				if (el.checked)
					compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(el.value));
				break;
			default:
			// file, button, reset
			break;
			}
		}
	return compStack.join('&');
};
