Question

我在HTML页面上有以下内容：

<script type="text/javascript">
setInterval(function(){refresh()},5000);
function refresh()
{
    $.post("test.php",
    {
           // nothing here             
    },
    function(data, textStatus)
    {      

      $('' + data + '').find('.maindiv').each(function () {
      $('.maindiv').replaceWith('.maindiv');
      });

    });  
}
</script>

<div id = "1" class= "maindiv">
<div sid= "1" class= "subdiv">old sub div content</div>
<div cid= "1" class= "childdiv">another old sub div</div>
<img id = "1" src="http://foo.com/bar.png"/>  
</div>

<div id = "2" class= "maindiv">
<div sid= "2" class= "subdiv">this content is old</div>
<div cid= "2" class= "childdiv">please update me!</div>
<img id= "2" src="http://foo.com/bar.png"/>  
</div>

调用更新元素的PHP页面（test.php）：

<?php

 echo '<div id = "1" class= "maindiv">
       <div sid= "1" class= "subdiv">this is new sub div</div>
       <div cid= "1" class= "childdiv">this is also new sub div content</div>
       <img id= "1" src="http://foo.com/bar.png"/>  
       </div>'; 

 echo '<div id = "2" class= "maindiv">
       <div sid= "2" class= "subdiv">new content</div>
       <div cid= "2" class= "childdiv">new content for this child div</div>
       <img id= "2" src="http://foo.com/bar.png"/>  
       </div>'; 
?>

这两个元素也出现在HTML页面上。基本上我想要调用PHP页面并从PHP页面获取这些元素并在HTML页面的响应中循环它们，并将每个maindiv（包括其所有子元素）替换为HTML页面上的相应元素。

这只是一个非常基本的例子。我这样做是因为内容在这些元素中发生了变化，并且想要替换像实时更新这样的元素。

我发布的功能似乎没有回应，所以不知道如何实现这一目标。

提前致谢

Answer 1

您需要索引页面中的maindiv元素，以便它们与新元素匹配。

还需要修改您要替换的内容

 $(data ).filter('.maindiv').each(function (index) {/* filter or find depends on html structure sent*/
      /* "this" is the current div in response*/          
      $('#'+this.id).replaceWith(this);
});

each将跟踪index，eq()用于匹配页面中的相同索引。

编辑：如果只输出是输出根目录中的DIV，还要将find()更改为filter()

Answer 2

为什么在收到ajax响应时，你不想有一个包围你要轮询的内容的div，用html()替换整个块

<?php 
//check for ajax and return
if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest'){
    header('Content-Type: text/html');

    $response = '
    <div id = "a" class= "maindiv">
       <div sid= "1" class= "subdiv">'.date("D M j G:i:s T Y").'</div>
       <div cid= "1" class= "childdiv">'.md5(time()).'</div>
       <img id= "1" src="http://foo.com/bar.png"/>  
    </div>
    <div id = "a" class= "maindiv">
       <div sid= "1" class= "subdiv">'.date("D M j G:i:s T Y").'</div>
       <div cid= "1" class= "childdiv">'.md5(time()+1).'</div>
       <img id= "1" src="http://foo.com/bar.png"/>  
    </div>'; 

    echo $response;
    die;
}
?>

<script type="text/javascript">
function poll(){
    setTimeout(function(){
        $.ajax({ url: "./test.php", cache: false,
        success: function(data){
            $("#polling").html( data );
            poll();
        }});
    }, 5000);
}
$(document).ready(function(){
    poll();
});
</script>


<div id = "polling" class= "maindiv">
    <!--New response will replace the below html-->
    <div id = "1" class= "maindiv">
    <div sid= "1" class= "subdiv">old sub div content</div>
    <div cid= "1" class= "childdiv">another old sub div</div>
    <img id = "1" src="http://foo.com/bar.png"/>  
    </div>

    <div id = "2" class= "maindiv">
    <div sid= "2" class= "subdiv">this content is old</div>
    <div cid= "2" class= "childdiv">please update me!</div>
    <img id= "2" src="http://foo.com/bar.png"/>  
    </div> 

</div>

修改

您还可以返回json，然后根据id将响应循环到div中这是一个例子：

<?php 
//check for ajax and return
if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest'){
    header('Content-Type: application/json');

    $response = array(
    'block_a'=>'content for block a (last_updated:)'.date("D M j G:i:s T Y"),
    'block_b'=>'content for block b (last_updated:)'.date("D M j G:i:s T Y"),
    'block_c'=>'content for block c (last_updated:)'.date("D M j G:i:s T Y"),
    'block_d'=>'content for block d (last_updated:)'.date("D M j G:i:s T Y"),
    'block_e'=>'content for block e (last_updated:)'.date("D M j G:i:s T Y"),
    ); 

    echo json_encode($response);
    die;
}
?>


<script type="text/javascript">
function poll(){
    setTimeout(function(){
        $.ajax({ url: "./test.php", cache: false,
        success: function(data){
            $.each(data, function(k, v) {
                //key value place html blocks
                $("#"+k).html(v);
            });
            poll();
        }, dataType: "json"});
    }, 1000);
}

$(document).ready(function(){
    poll();
});
</script>


<div id = "block_a" class= "maindiv"></div>
<div id = "block_b" class= "maindiv"></div>
<div id = "block_c" class= "maindiv"></div>
<div id = "block_d" class= "maindiv"></div>
<div id = "block_e" class= "maindiv"></div>

通过这种方式，您可以构建$response，只包含您希望在每次轮询时替换的内容。

通过ajax将jquery中的HTML解析为元素并替换页面上的每个对应元素

2 个答案:

修改