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 - Overlay a canvas over a div - Stack Overflow

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    javascript - Overlay a canvas over a div - Stack Overflow

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    I have a div and I want to overlay a canvas exactly on top of it with the same width, height, padding and margins. Although I am using position: absolute like most questions here remend and z-index the canvas is still showing underneath the div. This is the code I have until now.

    <div id ="editor-section">  
     <div class="editable" id="editor"></div>
</div> 

// the canvas is created / removed dynamically on connection / disconection 
hub.client.broadcastSomeoneConnected = function (connectionId, someoneConnected) 
{
    if (someoneConnected) {
        var canvas = document.createElement("canvas");
        canvas.id = connectionId;
        canvas.className = 'canvases';
        canvas.style.border = '2px solid red';
        canvas.style.zIndex = zindex;  
        zindex++;

        var parentDiv = document.getElementById("editor-section");
        parentDiv.appendChild(canvas);

    } else { // someone disconnected

        var canvas = document.getElementById(connectionId);
        canvas.parentNode.removeChild(canvas);
    }
 }

 // css for all canvases
 .canvases {
     width:60%; 
     height:700px;
     border:1px solid;
     position:absolute;
     padding: 5%;
     margin-left:20px;
     pointer-events: none;
 }

 // css for editor div
 #editor {
     padding: 5%;
     margin-left:20px;
     border: 2px solid black;
     overflow-y:scroll;
     height: "700px";
     width: "100%";
     background-color: white;
     margin-bottom:30px;
 }

    PS: zindex is initialized globally because I need multiple canvases layered on top of each other and the editor eventually depending on the number of people connected

    What am I doing wrong here? Thanks

    I have a div and I want to overlay a canvas exactly on top of it with the same width, height, padding and margins. Although I am using position: absolute like most questions here remend and z-index the canvas is still showing underneath the div. This is the code I have until now.

    <div id ="editor-section">  
     <div class="editable" id="editor"></div>
</div> 

// the canvas is created / removed dynamically on connection / disconection 
hub.client.broadcastSomeoneConnected = function (connectionId, someoneConnected) 
{
    if (someoneConnected) {
        var canvas = document.createElement("canvas");
        canvas.id = connectionId;
        canvas.className = 'canvases';
        canvas.style.border = '2px solid red';
        canvas.style.zIndex = zindex;  
        zindex++;

        var parentDiv = document.getElementById("editor-section");
        parentDiv.appendChild(canvas);

    } else { // someone disconnected

        var canvas = document.getElementById(connectionId);
        canvas.parentNode.removeChild(canvas);
    }
 }

 // css for all canvases
 .canvases {
     width:60%; 
     height:700px;
     border:1px solid;
     position:absolute;
     padding: 5%;
     margin-left:20px;
     pointer-events: none;
 }

 // css for editor div
 #editor {
     padding: 5%;
     margin-left:20px;
     border: 2px solid black;
     overflow-y:scroll;
     height: "700px";
     width: "100%";
     background-color: white;
     margin-bottom:30px;
 }

    PS: zindex is initialized globally because I need multiple canvases layered on top of each other and the editor eventually depending on the number of people connected

    What am I doing wrong here? Thanks

    • javascript
    • jquery
    • css
    • html
    Share Improve this question asked May 11, 2013 at 22:29 BerniceBernice 2,59211 gold badges45 silver badges75 bronze badges
    Add a ment  | 

    1 Answer 1

    Reset to default 12

    Almost there. Move width and height on the container, make it relative, and the editor and canvas absolutely positioned at 0,0 with 100% width/height. The zIndex of your editor must be lower than the zIndex of your canvas. fiddle

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