Current File : /home/caballoscriollos/public_html/espanol/thumbnails.js
/**
* thumbnailsjs - JavaScript interface to retrieve thumbnails from PageGlimpse.com
* http://925html.com/code/webpage-thumbnails/
*
* Copyright (c) 2009 Eric Ferraiuolo - http://eric.ferraiuolo.name
* MIT License - http://www.opensource.org/licenses/mit-license.php
*/
(function(){
/**
* Retrieves thumbnails of webpages via the Page Glimpse service
*
* @class Thumbnails
* @param {Object} config Configuration
* @constructor
*/
var Thumbnails = function (config) {
// make the constructor an optional factory
if ( ! (this instanceof arguments.callee) ) {
return new arguments.callee(config);
}
/**
* Your PageGlimpse API deveoper key. All requests to PageGlimpse service require a devkey.
*
* @property devkey
* @type String
* @default null
*/
this.devkey = config.devkey || null;
/**
* The size of thumbnail. Available sizes are: small, medium, large.
*
* @property size
* @type String
* @default 'small'
*/
this.size = config.size || 'small';
/**
* Indicates if the thumbnails for the domain root should be displayed.
* The root thumbnail image will only be used if an interior page's thumbnail hasn't been resolved.
*
* @property root
* @type Boolean
* @default true
*/
this.root = config.root === false ? false : true;
/**
* If the thumbnail for the website is not yet taken, the URL for this property will be used.
* If this parameter is not set a PageGlimpse default image will be returned.
*
* @property nothumb
* @type String
* @default null
*/
this.nothumb = config.nothumb || null;
};
/**
* Base URL of Page Glimpse RESTful HTTP API
*
* @property Thumbnails.BASE_URL
* @type String
* @static
*/
Thumbnails.BASE_URL = 'http://images.pageglimpse.com/v1/thumbnails';
Thumbnails.prototype = {
/**
* Retrieves the thumbnail for a URL with the current configuration settings
*
* @method get
* @param {String | Array} url Location of webpage(s)
* @param {Function} callback Function to pass the webpage URL and image Node once fully downloaded
* @chainable
*/
get : function ( url, callback ) {
var urlIsArray = Object.prototype.toString.call(url) === '[object Array]',
urls, i;
if ( this.devkey && url ) {
urls = urlIsArray ? url : [url];
for ( i = 0; i < urls.length; i++ ) {
this._loadImg( urls[i], this._createSrcUrl(urls[i]), callback );
}
}
return this;
},
/**
* Generates the image's src URL by combining the Page Glimpse API base URL with the query-string parameters
*
* @method _createSrcUrl
* @param {String} url Location of the webpage
* @return {String} src URL of the image on Page Glimpse
* @protected
*/
_createSrcUrl : function (url) {
var queryString = [
'?', 'devkey=', this.devkey,
'&', 'url=', url,
'&', 'size=', this.size,
'&', 'root=', ( this.root ? 'yes' : 'no' ),
'&', 'nothumb=', ( this.nothumb ? this.nothumb : '' )
].join('');
return Thumbnails.BASE_URL + queryString;
},
/**
* Create the image Node and wait until it has fully downloaded before calling the callback function
* via Luke Smith (http://lucassmith.name): http://lucassmith.name/2008/11/is-my-image-loaded.html
*
* @method _loadImg
* @param {String} url Location of the webpage
* @param {String} src URL of the image on Page Glimpse
* @param {Function} callback Function to pass the webpage URL and image Node once fully downloaded
* @protected
*/
_loadImg : function ( url, src, callback ) {
var img = new Image(),
prop = img.naturalWidth ? 'naturalWidth' : 'width';
img.src = src;
if ( callback ) {
if ( img.complete ) {
callback( url, img[prop] ? img : null );
} else {
img.onload = function(){
callback( url, img );
};
img.onerror = function(){
callback.call( url, null );
};
}
}
}
};
window.Thumbnails = Thumbnails;
})();
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