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, entries_num, title, title_link) {

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

    22   var preview = this;

    23   feed.setNumEntries(entries_num)

    24   feed.load(function(result) {

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

    26   });

    27 }

    28 

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

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

    31   while (this.container_.firstChild) {

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

    33   }

    34 

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

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

    37   if (!title) {

    38     title = result.feed.title;

    39   }

    40   if (!title_link) {

    41     title_link = result.feed.link;

    42   }

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

    44 

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

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

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

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

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

    50     if (entry.author) {

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

    52     }

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

    54   }

    55 }

    56 

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

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

    59 }

    60 

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

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

    63   link.href = href;

    64   return link;

    65 }

    66 

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

    68                                                 opt_text) {

    69   var div = document.createElement(tagName);

    70   div.className = className;

    71   parent.appendChild(div);

    72   if (opt_text) {

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

    74   }

    75   return div;

    76 }

    77