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) {

    31     return;

    32   }

    33   while (this.container_.firstChild) {

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

    35   }

    36 

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

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

    39   if (!title) {

    40     title = result.feed.title;

    41   }

    42   if (!title_link) {

    43     title_link = result.feed.link;

    44   }

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

    46 

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

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

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

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

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

    52     if (entry.author) {

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

    54     }

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

    56   }

    57 };

    58 

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

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

    61 };

    62 

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

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

    65   link.href = href;

    66   return link;

    67 };

    68 

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

    70                                                  opt_text) {

    71   var div = document.createElement(tagName);

    72   div.className = className;

    73   parent.appendChild(div);

    74   if (opt_text) {

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

    76   }

    77   return div;

    78 };

    79