te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>How can I select an HTML element from JavaScript without knowing its ID? - Stack Overflow

科技改变生活-雨落星辰 - 所有的伟大,都源于一个勇敢的开始

    最新消息：雨落星辰是一个专注网站SEO优化、网站SEO诊断、搜索引擎研究、网络营销推广、网站策划运营及站长类的自媒体原创博客
    你的位置： 首页>programmer>How can I select an HTML element from JavaScript without knowing its ID? - Stack Overflow

    How can I select an HTML element from JavaScript without knowing its ID? - Stack Overflow

    programmeradmin4浏览0评论

    I have an unknown number of <img> elements on my page with no IDs, and I need to be able to browse through them and set certain attributes based on a number of unpredictable factors.

    I have an unknown number of <img> elements on my page with no IDs, and I need to be able to browse through them and set certain attributes based on a number of unpredictable factors.

    • javascript
    • html
    • select
    • image
    Share Improve this question edited Nov 24, 2010 at 4:52 Giffyguy asked Nov 24, 2010 at 4:42 GiffyguyGiffyguy 21.3k36 gold badges102 silver badges175 bronze badges 0
    Add a ment  | 

    8 Answers 8

    Reset to default 6

    You would use this function to browse through them as an array:

    document.getElementsByTagName('img');

    This is an array of img elements, and you can treat it as if you were using the getElementById() function (i.e. you can still do the same operations on the elements, but you need to reference an element):

    document.getElementsByTagName('img')[0]

    If the factors you are speaking about are really plicated, I would use jQuery (it's really powerful):

    $('img[alt]').css('padding', '10px');

    This would add a 10px padding to every image with an alt attribute (I hope, as I'm notorious for posting almost-working code).

    Good luck!

    Everyone forgets about document.images...

    for(var i = 0; i < document.images.length; i++) {
  var img = document.images[i];

  if(img.src == "banner.gif") {
     img.alt = "Banner";
  }
  else if(img.alt == "Giraffe") {
     img.title = "15 feet tall!";
  }
}

    If you need to get images within another element, you can use getElementsByTagName...

    var elem = document.getElementById('foo');
var fooImages = elem.getElementsByTagName('img');

    Use document.getElementsByTagName():

    var imgs = document.getElementsByTagName("img");

for(var i = 0; i < imgs.length; i++) {
   var currentImg = imgs[i];
   if (currentImg.somAttr) {
       // do your stuff
   }
}

    You can use getElementsByTagName to get a list of the img tags:

    https://developer.mozilla/en/DOM/element.getElementsByTagName

    You can set name attribue for image tag and can perform any operation using document.getElementsByName.

    for example

    <script type="text/javascript">
function getElements()
  {
  var x=document.getElementsByName("x");
  alert(x.length);
  }
</script>

<input name="x" type="text" size="20" /><br />
<input name="x" type="text" size="20" />

    Use jQuery and search by element type $("img").each() to perform am operation on each element

    jQuery is probably your best bet. Otherwise you'll have to traverse a dom tree and check for attributes manually. Once you use jQuery you can select elements by attributes like name, class, the tag name (input, image, etc) and binations of them.

    $("image .className").attr(....

    http://www.jquery.

    It's hard to answer this without knowing more specifics, but have you considered using Jquery?

    与本文相关的文章

    发布评论

    评论列表(0)

    1. 暂无评论