Question

这是我提问的问题。

http://jsfiddle.net/jaribhai/wncwqerj/1/

这是代码。

// Feed configuration
var homePage = 'http://video-testing-tahir.blogspot.com',
    maxResults = 4,
    summaryLength = 170,
    noImageUrl = 'http://3.bp.blogspot.com/-vpCFysMEZys/UOEhSGjkfnI/AAAAAAAAFwY/h1wuA5kfEhg/s72-c/grey.png',
    containerId = 'random-post-container';
// Function to generate random number limited from `min` to `max`
// Used to create a valid and safe random feed `start-index`
function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}
// Function to shuffle arrays
// Used to randomize order of the generated JSON feed
function shuffleArray(arr) {
    var i = arr.length, j, temp;
    if (i === 0) return false;
    while (--i) {
        j = Math.floor(Math.random() * (i + 1));
        temp = arr[i];
        arr[i] = arr[j]; 
        arr[j] = temp;
    }
    return arr;
}
// Get a random start index
function createRandomPostsStartIndex(json) {
    var startIndex = getRandomInt(1, (json.feed.openSearch$totalResults.$t - maxResults));
    if (window.console && window.console.log) console.log('Get the post feed start from ' + startIndex + ' until ' + (startIndex + maxResults)); 
    // document .write('<scr' + 'ipt src="' + homePage + '/feeds/posts/summary?alt=json-in-script&orderby=updated&start-index=' + startIndex + '&max-results=' + maxResults + '&callback=randomPosts"></scr' + 'ipt>');
    add_script(homePage + '/feeds/posts/summary?alt=json-in-script&orderby=updated&start-index=' + startIndex + '&max-results=' + maxResults + '&callback=randomPosts');
}
// Widget's main function
function randomPosts(json) {
    var link, summary, img,
        ct = document.getElementById(containerId),
        entry = shuffleArray(json.feed.entry),
        skeleton = "<ul>";
    for (var i = 0, len = entry.length; i < len; i++) {
        summary = ("summary" in entry[i]) ? (entry[i].summary.$t.replace(/<.*?>/g, "")).substring(0, summaryLength) + '&hellip;' : "";
        img = ("media$thumbnail" in entry[i]) ? entry[i].media$thumbnail.url.replace(/\/s[0-9]+(-c)?/, "/s72-c") : noImageUrl;
        for (var j = 0, jen = entry[i].link.length; j < jen; j++) {
            link = (entry[i].link[j].rel == "alternate") ? entry[i].link[j].href : '#';
        }
        skeleton += '<li>';
        skeleton += '<img src="' + img + '" alt="" width="72" height="72">';
        skeleton += '<a href="' + link + '">' + entry[i].title.$t + '</a><br>';
        skeleton += '<span>' + summary + '</span>';
// Show all post labels ...
skeleton += ' <small>';
var tags = entry[i].category,
    labels = [];
for(var z = 0, zen = tags.length; z < zen; ++z) {
    labels.push('<a href="' + homePage + '/search/label/' + encodeURIComponent(tags[z].term) + '?max-results=20" rel="tag">' + tags[z].term + '</a>');
}
skeleton += labels.join(', ');
skeleton += '</small>';
        skeleton += '<span class="clear"></span></li>';
    }
    ct.innerHTML = skeleton + '</ul>';
}
// document .write('<scr' + 'ipt src="' + homePage + '/feeds/posts/summary?alt=json-in-script&max-results=0&callback=createRandomPostsStartIndex"></scr' + 'ipt>');
add_script(homePage + '/feeds/posts/summary?alt=json-in-script&max-results=0&callback=createRandomPostsStartIndex');
function add_script(url) {
    var s = document.createElement('script');
    s.src = url;
    document.getElementsByTagName('head')[0].appendChild(s);
}

这是来自博主的随机帖子小部件的演示。它仅显示从博客链接图像的那些帖子的缩略图，但不显示从外部源链接的那些图像的缩略图。我该怎么做才能使外部主机的图像也出现在缩略图中。

Answer 1

由于图片是在外部托管的，因此它不会出现在Feed的media$thumbnail字段中。我们将不得不解析帖子的HTML内容以提取图像的URL。需要做两处更改才能完成这项工作 -

首先从summary Feed切换到default Feed网址。这对于获取帖子的HTML内容是必要的（summary Feed仅包含帖子的有限摘要文本而不是完整的HTML）。更改

的每个实例

/feeds/posts/summary?alt=json-in-script

到

/feeds/posts/default?alt=json-in-script

其次改变从

中查找帖子中图像的条件

img = ("media$thumbnail" in entry[i]) ? entry[i].media$thumbnail.url.replace(/\/s[0-9]+(-c)?/, "/s72-c") : noImageUrl;

到

if ("media$thumbnail" in entry[i]) {
  img = entry[i].media$thumbnail.url.replace(/\/s[0-9]+(-c)?/, "/s72-c");
} else if (entry[i].content.$t.match(/\<img.+src\=(?:\"|\')(.+?)(?:\"|\')(?:.+?)\>/)) {
  img = entry[i].content.$t.match(/\<img.+src\=(?:\"|\')(.+?)(?:\"|\')(?:.+?)\>/)[1];
} else {
  img = noImageUrl;
}

参考下面的工作示例 -

// Feed configuration
var homePage = 'http://video-testing-tahir.blogspot.com',
  maxResults = 4,
  summaryLength = 170,
  noImageUrl = 'http://3.bp.blogspot.com/-vpCFysMEZys/UOEhSGjkfnI/AAAAAAAAFwY/h1wuA5kfEhg/s72-c/grey.png',
  containerId = 'random-post-container';

// Function to generate random number limited from `min` to `max`
// Used to create a valid and safe random feed `start-index`
function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

// Function to shuffle arrays
// Used to randomize order of the generated JSON feed
function shuffleArray(arr) {
  var i = arr.length,
    j, temp;
  if (i === 0) return false;
  while (--i) {
    j = Math.floor(Math.random() * (i + 1));
    temp = arr[i];
    arr[i] = arr[j];
    arr[j] = temp;
  }
  return arr;
}

// Get a random start index
function createRandomPostsStartIndex(json) {
  var startIndex = getRandomInt(1, (json.feed.openSearch$totalResults.$t - maxResults));
  if (window.console && window.console.log) console.log('Get the post feed start from ' + startIndex + ' until ' + (startIndex + maxResults));
  // document .write('<scr' + 'ipt src="' + homePage + '/feeds/posts/summary?alt=json-in-script&orderby=updated&start-index=' + startIndex + '&max-results=' + maxResults + '&callback=randomPosts"></scr' + 'ipt>');
  add_script(homePage + '/feeds/posts/default?alt=json-in-script&orderby=updated&start-index=' + startIndex + '&max-results=' + maxResults + '&callback=randomPosts');
}

// Widget's main function
function randomPosts(json) {
  var link, summary, img,
    ct = document.getElementById(containerId),
    entry = shuffleArray(json.feed.entry),
    skeleton = "<ul>";
  for (var i = 0, len = entry.length; i < len; i++) {
    summary = ("content" in entry[i]) ? (entry[i].content.$t.replace(/<.*?>/g, "")).substring(0, summaryLength) + '&hellip;' : "";
    if ("media$thumbnail" in entry[i]) {
      img = entry[i].media$thumbnail.url.replace(/\/s[0-9]+(-c)?/, "/s72-c");
    } else if (entry[i].content.$t.match(/\<img.+src\=(?:\"|\')(.+?)(?:\"|\')(?:.+?)\>/)) {
      img = entry[i].content.$t.match(/\<img.+src\=(?:\"|\')(.+?)(?:\"|\')(?:.+?)\>/)[1];
    } else {
      img = noImageUrl;
    }
    for (var j = 0, jen = entry[i].link.length; j < jen; j++) {
      link = (entry[i].link[j].rel == "alternate") ? entry[i].link[j].href : '#';
    }
    skeleton += '<li>';
    skeleton += '<img src="' + img + '" alt="" width="72" height="72">';
    skeleton += '<a href="' + link + '">' + entry[i].title.$t + '</a><br>';
    skeleton += '<span>' + summary + '</span>';



    // Show all post labels ...
    skeleton += ' <small>';
    var tags = entry[i].category,
      labels = [];
    for (var z = 0, zen = tags.length; z < zen; ++z) {
      labels.push('<a href="' + homePage + '/search/label/' + encodeURIComponent(tags[z].term) + '?max-results=20" rel="tag">' + tags[z].term + '</a>');
    }
    skeleton += labels.join(', ');
    skeleton += '</small>';



    skeleton += '<span class="clear"></span></li>';
  }
  ct.innerHTML = skeleton + '</ul>';
}

// document .write('<scr' + 'ipt src="' + homePage + '/feeds/posts/summary?alt=json-in-script&max-results=0&callback=createRandomPostsStartIndex"></scr' + 'ipt>');
add_script(homePage + '/feeds/posts/summary?alt=json-in-script&max-results=0&callback=createRandomPostsStartIndex');


/**
 * `document[dot]write` is disallowed in JSFiddle envioriment and might break your fiddle.
 */

function add_script(url) {
  var s = document.createElement('script');
  s.src = url;
  document.getElementsByTagName('head')[0].appendChild(s);
}

body {
  margin: 0;
  padding: 50px;
  background-color: white;
  font: normal normal 11px/1.4 Arial, Sans-Serif;
  color: black;
}
#random-post-container {
  width: 400px
}
#random-post-container ul,
#random-post-container li {
  margin: 0;
  padding: 0;
  list-style: none;
  overflow: hidden;
}
#random-post-container img {
  display: block;
  float: left;
  border: 1px solid;
  margin: 2px 7px 5px 0;
}
#random-post-container a {
  font-weight: bold;
  font-size: 110%;
}
#rancom-post-container .clear {
  display: block;
  clear: both;
}

<h2>Random Post</h2>
<div id='random-post-container'>Memuat&hellip;</div>

来自外部源的缩略图不会出现在随机帖子小部件中

1 个答案: