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; } ?>javascript - Why Image 'complete' property always return true even if there is no src tag? - 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>javascript - Why Image 'complete' property always return true even if there is no src tag? - Stack Overflow

    javascript - Why Image 'complete' property always return true even if there is no src tag? - Stack Overflow

    programmeradmin4浏览0评论

    I just write 

    document.createElement("img")plete;//To check whether image is loaded or not

    In Firefox,it returns true. In IE,it return false

    OR

    In a html page just create one image as:

     <!-- IMG tag with no SRC attribute. -->
<img id="noSrcImg" />

    and In js check the plete property value :

    var img = document.getElementById("noSrcImg");
imgplete

    true for FF and false for IE

    Can any one explain why this inconsistent behavior?

    Is there any other better way to check whether image is loaded or not in DOM?

    i tried with readyState attribute as well but its not available for IE11.

    I just write 

    document.createElement("img").plete;//To check whether image is loaded or not

    In Firefox,it returns true. In IE,it return false

    OR

    In a html page just create one image as:

     <!-- IMG tag with no SRC attribute. -->
<img id="noSrcImg" />

    and In js check the plete property value :

    var img = document.getElementById("noSrcImg");
img.plete

    true for FF and false for IE

    Can any one explain why this inconsistent behavior?

    Is there any other better way to check whether image is loaded or not in DOM?

    i tried with readyState attribute as well but its not available for IE11.

    • javascript
    • html
    • image
    • internet-explorer-11
    Share Improve this question edited May 14, 2014 at 14:26 Kuf 17.8k7 gold badges68 silver badges91 bronze badges asked May 14, 2014 at 14:23 Anurag RatnaAnurag Ratna 3111 gold badge4 silver badges11 bronze badges 2
    • use load/error events to verify wether image is loaded correctly – Yuriy Galanter Commented May 14, 2014 at 14:26
    • some explanations here. stackoverflow./questions/8031886/… – volkinc Commented May 14, 2014 at 14:46
    Add a ment  | 

    4 Answers 4

    Reset to default 6

    This is a bug in IE. According to the spec:

    The IDL attribute plete must return true if any of the following conditions is true:

    • The src attribute is omitted.
    • The final task that is queued by the networking task source once the resource has been fetched has been queued.
    • The img element is pletely available.
    • The img element is broken.

    Otherwise, the attribute must return false.

    The best way to know the state of an image, is to handle the load and error events. If that isn't feasible, for whatever reason, to tell if an image has loaded successfully, check for img.plete && img.naturalWidth > 0. If true, the image has loaded successfully. Otherwise, the image is either still loading, or has failed to load - it's difficult to tell which because of IE's inconsistency.

    Please try load

    Also make sure the event handlers are defined BEFORE you assign src - on really fast networks, the src may load before the event handler if not defined first

    var im = document.createElement("img");
im.onload=function() { alert(this.src+' loaded')} // assign before src
im.onerror=function() { alert(this.src+' failed')} // if necessary
im.src="someimage.jpg";

    Returns a Boolean that is true if the browser has finished fetching the image, whether successful or not. It also shows true, if the image has no src value.

    Empty img src like any href as a relative URL refers to a base URL, the URL of the document. @mplungjan posted good solution to actually check if and when it was loaded

    与本文相关的文章

    发布评论

    评论列表(0)

    1. 暂无评论