JS只返回隐藏未定义值后数组中第一个id的值

Question

我从一个页面和一个php服务器端页面（server.php）发送了许多动态post ID并用这些id进行查询以找出新增数据在MySQL中。

如果没有发现在MySQL任何新添加的数据，它返回一个undefined值。所以我加了这个if (msg.id !== undefined && msg.detail !== undefined && msg.name !== undefined) { //do here }来隐藏未定义的。

但是，在添加上面的行后，我的脚本隐藏undefined值很好，但只返回第一个CID的新增值。

这意味着如果CID向php发送了id（100,101,102,103等），它只返回100个id的新增值并追加它。

请问哪里有问题？

N.B.如果没有上面的行，它将返回所有CID的值，但如果没有找到新数据，还会返回undefined值。

我的javascript：

var CID = []; // Get all dynamic ids of posts (works well) 
$('div[data-post-id]').each(function(i){ 
CID[i] = $(this).data('post-id'); 
}); 

function addrep(type, msg){ 
CID.forEach(function(id){ 
if (msg.id !== undefined && msg.detail !== undefined && msg.name !== undefined) { 
    $("#newreply"+id).append("<div class='"+ type +""+ msg.id +"'><ul><div class='newkochi'>"+ msg.name +"</div><div class='cdomment_text'>"+ msg.detail +"</ul></div>"); 
} 
}); 
} 

function waitForRep(){ 
    $.ajax({ 
     type: "GET", 
     url: "server.php", 
     cache: false, 
     data: {CID : CID}, 
     timeout:15000, 
     success: function(data){ 
      addrep("postreply", data); 
      setTimeout(waitForRep, 15000); 
     }, 
     error: function(XMLHttpRequest, textStatus, errorThrown){ 
      setTimeout(waitForRep, 15000); } 
    }); 
} 

$(document).ready(function(){ 
    waitForRep(); 
}); 

server.php在JavaScript

while (true) { 
    if($_GET['CID']){ //cid got all dynamic post id as: 1,2,3,4 etc. 
     foreach($_GET['CID'] as $key => $value){ 

     $datetime = date('Y-m-d H:i:s', strtotime('-15 second')); 
     $res = mysqli_query($dbh,"SELECT * FROM reply WHERE qazi_id=".$_GET['tutid']." AND date >= '$datetime' ORDER BY id DESC LIMIT 1") or die(mysqli_error($dbh)); 
    $data = array(); 
     while($rows = mysqli_fetch_assoc($res)){ 

      $data[]=$rows; 

      $data['id'] = $rows['id']; 
      $data['qazi_id'] = $rows['qazi_id']; 
      $data['username'] = $rows['username']; 
      $data['description'] = $rows['description']; 
      $data['date'] = $rows['date']; 
      //etc. all 
      $id = $rows['id']; 
      $qazi_id = $rows['qazi_id']; 
      $username = $rows['username']; 
      $description = $rows['description']; 
      //etc. all 
      } //while close 
     } //foreach close 

      $name .='<p class="name">'.$username.' Says:</p>'; 
      $detail .=''.$description.''; 

      $data['name'] = $name; 
      $data['detail'] = $detail; 
      // do others something more like as above 

      if (!empty($data)) { 
       echo json_encode($data); 
       flush(); 
       exit(0); 
      } 

    } //request close 
    sleep(5); 
} //while close 

Answer 1

斑点问题：

修复1：

var CID = [$('div[data-post-id]').length]; 

$('div[data-post-id]').each(function(i){ 
CID[i] = $(this).data('post-id'); 
}); 

修复2：

var CID = []; 
$('div[data-post-id]').each(function(i){ 
CID.push($(this).data('post-id')); 
}); 

插入问题：

function addrep(type, msg){ 
CID.forEach(function(id){ 
//You are inserting the comment in all html tags havin id ='newreplay' + id 
//Here you need to correct you logic like: if (msg.id == id) //do something 

if (msg.id !== undefined && msg.detail !== undefined && msg.name !== undefined) { 
    $("#newreply"+id).append("<div class='"+ type +""+ msg.id +"'><ul><div class='newkochi'>"+ msg.name +"</div><div class='cdomment_text'>"+ msg.detail +"</ul></div>"); 
} 
}); 
}