1 /* Copyright 2008 the Melange authors.

     2  *

     3  * Licensed under the Apache License, Version 2.0 (the "License");

     4  * you may not use this file except in compliance with the License.

     5  * You may obtain a copy of the License at

     6  * 

     7  *   http://www.apache.org/licenses/LICENSE-2.0

     8  * 

     9  * Unless required by applicable law or agreed to in writing, software

    10  * distributed under the License is distributed on an "AS IS" BASIS,

    11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    12  * See the License for the specific language governing permissions and

    13  * limitations under the License.

    14  */

    15 

    16 function BlogPreview(container) {

    17   this.container_ = container;

    18 }

    19 

    20 BlogPreview.prototype.show = function(url, title, title_link) {

    21   var feed = new google.feeds.Feed(url);

    22   var preview = this;

    23   feed.load(function(result) {

    24     preview.render_(result, title, title_link);

    25   });

    26 }

    27 

    28 BlogPreview.prototype.render_ = function(result, title, title_link) {

    29   if (!result.feed || !result.feed.entries) return;

    30   while (this.container_.firstChild) {

    31     this.container_.removeChild(this.container_.firstChild);

    32   }

    33 

    34   var blog = this.createDiv_(this.container_, "blog");

    35   var header = this.createElement_("h2", blog, "");

    36   if (!title) {

    37     title = result.feed.title;

    38   }

    39   if (!title_link) {

    40     title_link = result.feed.link;

    41   }

    42   this.createLink_(header, title_link, title);

    43 

    44   for (var i = 0; i < result.feed.entries.length; i++) {

    45     var entry = result.feed.entries[i];

    46     var div = this.createDiv_(blog, "entry");

    47     var linkDiv = this.createDiv_(div, "title");

    48     this.createLink_(linkDiv, entry.link, entry.title);

    49     if (entry.author) {

    50       this.createDiv_(div, "author", "Posted by " + entry.author);

    51     }

    52     this.createDiv_(div, "snippet", entry.contentSnippet);

    53   }

    54 }

    55 

    56 BlogPreview.prototype.createDiv_ = function(parent, className, opt_text) {

    57   return this.createElement_("div", parent, className, opt_text);

    58 }

    59 

    60 BlogPreview.prototype.createLink_ = function(parent, href, text) {

    61   var link = this.createElement_("a", parent, "", text);

    62   link.href = href;

    63   return link;

    64 }

    65 

    66 BlogPreview.prototype.createElement_ = function(tagName, parent, className,

    67                                                 opt_text) {

    68   var div = document.createElement(tagName);

    69   div.className = className;

    70   parent.appendChild(div);

    71   if (opt_text) {

    72     div.appendChild(document.createTextNode(opt_text));

    73   }

    74   return div;

    75 }

    76