284 lines
7.1 KiB
JavaScript
Executable File
284 lines
7.1 KiB
JavaScript
Executable File
/*
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Copyright (c) 2009, Yahoo! Inc. All rights reserved.
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Code licensed under the BSD License:
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http://developer.yahoo.net/yui/license.txt
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version: 3.0.0
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build: 1549
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*/
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YUI.add('io-upload-iframe', function(Y) {
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/**
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* Extends the IO base class to enable file uploads, with HTML forms,
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* using an iframe as the transport medium.
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* @module io
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* @submodule io-upload-iframe
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*/
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var w = Y.config.win;
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/**
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* @description Parses the POST data object and creates hidden form elements
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* for each key-value, and appends them to the HTML form object.
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* @method appendData
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* @private
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* @static
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* @param {object} f HTML form object.
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* @param {string} s The key-value POST data.
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* @return {array} e Array of created fields.
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*/
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function _addData(f, s) {
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var o = [],
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m = s.split('='),
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i, l;
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for (i = 0, l = m.length - 1; i < l; i++) {
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o[i] = document.createElement('input');
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o[i].type = 'hidden';
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o[i].name = m[i].substring(m[i].lastIndexOf('&') + 1);
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o[i].value = (i + 1 === l) ? m[i + 1] : m[i + 1].substring(0, (m[i + 1].lastIndexOf('&')));
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f.appendChild(o[i]);
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}
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return o;
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}
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/**
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* @description Removes the custom fields created to pass additional POST
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* data, along with the HTML form fields.
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* @method f
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* @private
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* @static
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* @param {object} f HTML form object.
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* @param {object} o HTML form fields created from configuration.data.
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* @return {void}
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*/
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function _removeData(f, o) {
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var i, l;
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for(i = 0, l = o.length; i < l; i++){
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f.removeChild(o[i]);
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}
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}
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/**
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* @description Sets the appropriate attributes and values to the HTML
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* form, in preparation of a file upload transaction.
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* @method _setAttrs
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* @private
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* @static
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* @param {object} f HTML form object.
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* @param {object} id The Transaction ID.
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* @param {object} uri Qualified path to transaction resource.
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* @return {void}
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*/
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function _setAttrs(f, id, uri) {
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var ie8 = (document.documentMode && document.documentMode === 8) ? true : false;
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f.setAttribute('action', uri);
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f.setAttribute('method', 'POST');
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f.setAttribute('target', 'ioupload' + id );
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f.setAttribute(Y.UA.ie && !ie8 ? 'encoding' : 'enctype', 'multipart/form-data');
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}
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/**
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* @description Sets the appropriate attributes and values to the HTML
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* form, in preparation of a file upload transaction.
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* @method _resetAttrs
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* @private
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* @static
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* @param {object} f HTML form object.
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* @param {object} a Object of original attributes.
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* @return {void}
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*/
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function _resetAttrs(f, a){
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var p;
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for (p in a) {
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if (a.hasOwnProperty(a, p)) {
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if (a[p]) {
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f.setAttribute(p, f[p]);
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}
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else {
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f.removeAttribute(p);
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}
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}
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}
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}
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/**
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* @description Creates the iframe transported used in file upload
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* transactions, and binds the response event handler.
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*
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* @method _create
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* @private
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* @static
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* @param {object} o Transaction object generated by _create().
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* @param {object} c Configuration object passed to YUI.io().
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* @return {void}
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*/
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function _create(o, c) {
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var i = Y.Node.create('<iframe id="ioupload' + o.id + '" name="ioupload' + o.id + '" />');
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i._node.style.position = 'absolute';
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i._node.style.top = '-1000px';
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i._node.style.left = '-1000px';
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Y.one('body').appendChild(i);
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// Bind the onload handler to the iframe to detect the file upload response.
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Y.on("load", function() { _handle(o, c) }, '#ioupload' + o.id);
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}
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/**
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* @description Bound to the iframe's Load event and processes
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* the response data.
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* @method _handle
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* @private
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* @static
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* @param {o} o The transaction object
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* @param {object} c Configuration object for the transaction.
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* @return {void}
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*/
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function _handle(o, c) {
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var d = Y.one('#ioupload' + o.id).get('contentWindow.document'),
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b = d.one('body'),
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xml = (d._node.nodeType === 9),
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p;
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if (c.timeout) {
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_clearTimeout(o.id);
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}
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if (b) {
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// When a response Content-Type of "text/plain" is used, Firefox and Safari
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// will wrap the response string with <pre></pre>.
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p = b.query('pre:first-child');
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o.c.responseText = p ? p.get('innerHTML') : b.get('innerHTML');
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}
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else if (xml) {
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o.c.responseXML = d._node;
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}
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Y.io.complete(o, c);
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Y.io.end(o, c);
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// The transaction is complete, so call _destroy to remove
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// the event listener bound to the iframe transport, and then
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// destroy the iframe.
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w.setTimeout( function() { _destroy(o.id); }, 0);
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}
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/**
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* @description Starts timeout count if the configuration object
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* has a defined timeout property.
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*
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* @method _startTimeout
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* @private
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* @static
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* @param {object} o Transaction object generated by _create().
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* @param {object} c Configuration object passed to YUI.io().
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* @return {void}
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*/
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function _startTimeout(o, c) {
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Y.io._timeout[o.id] = w.setTimeout(
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function() {
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var r = { id: o.id, status: 'timeout' };
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Y.io.complete(r, c);
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Y.io.end(r, c);
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}, c.timeout);
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}
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/**
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* @description Clears the timeout interval started by _startTimeout().
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* @method _clearTimeout
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* @private
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* @static
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* @param {number} id - Transaction ID.
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* @return {void}
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*/
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function _clearTimeout(id) {
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w.clearTimeout(Y.io._timeout[id]);
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delete Y.io._timeout[id];
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}
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/**
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* @description
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* @method _destroy
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* @private
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* @static
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* @param {o} o The transaction object
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* @param {object} uri Qualified path to transaction resource.
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* @param {object} c Configuration object for the transaction.
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* @return {void}
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*/
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function _destroy(id) {
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Y.Event.purgeElement('#ioupload' + id, false);
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Y.one('body').removeChild(Y.one('#ioupload' + id));
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}
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Y.mix(Y.io, {
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/**
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* @description Uploads HTML form data, inclusive of files/attachments,
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* using the iframe created in _create to facilitate the transaction.
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* @method _upload
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* @private
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* @static
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* @param {o} o The transaction object
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* @param {object} uri Qualified path to transaction resource.
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* @param {object} c Configuration object for the transaction.
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* @return {void}
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*/
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_upload: function(o, uri, c) {
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var f = (typeof c.form.id === 'string') ? Y.config.doc.getElementById(c.form.id) : c.form.id,
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fields,
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// Track original HTML form attribute values.
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attr = {
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action: f.getAttribute('action'),
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target: f.getAttribute('target')
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};
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_create(o, c);
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// Initialize the HTML form properties in case they are
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// not defined in the HTML form.
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_setAttrs(f, o.id, uri);
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if (c.data) {
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fields = _addData(f, c.data);
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}
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// Start polling if a callback is present and the timeout
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// property has been defined.
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if (c.timeout) {
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_startTimeout(o, c);
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}
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// Start file upload.
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f.submit();
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Y.io.start(o.id, c);
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if (c.data) {
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_removeData(f, fields);
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}
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// Restore HTML form attributes to their original values.
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_resetAttrs(f, attr);
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return {
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id: o.id,
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abort: function() {
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var r = { id: o.id, status: 'abort' };
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if (Y.one('#ioupload' + o.id)) {
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_destroy(o.id);
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Y.io.complete(r, c);
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Y.io.end(r, c);
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}
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else {
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return false;
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}
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},
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isInProgress: function() {
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return Y.one('#ioupload' + o.id) ? true : false;
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}
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}
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}
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});
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}, '3.0.0' ,{requires:['io-base','node-base','event-base']});
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