Question

我试图在一段时间后更改div的内部HTML。我得到了正确的回应，我想用Ajax。但无法替换后选择的内部HTML和Ajax响应。我的代码有什么问题..

HTML

      <p class="time ui-li-desc" data-time="2013-02-13 11:30:08" >
    51 seconds ago<img alt="image" src="images/read.png"></p>

      <p class="time ui-li-desc" data-time="2013-02-13 11:30:16" >
    58 seconds ago<img alt="image" src="images/read.png"></p>
.
.
.
.
.
      <p class="time ui-li-desc" data-time="2013-02-13 11:40:08" >
    10 minute ago<img alt="image" src="images/read.png"></p>

j查询

setInterval(function() { 
            $( ".time" ).each(function( index ) {
                var sendTime=  $(this).attr("data-time");
                dataString = "sendtime="+sendTime+"&q=convertTime";
                $.ajax({
                    type: "POST",
                    url: "data_handler.php",
                    data: dataString,                   
                    cache: true,
                    success: function(response) {
                        alert(response);
                        $(this).html(response);
                        //alert(response);
                    }
                });
            });
        }, 5000);

Answer 1

this是回调中的窗口。使用给予每个callback的值：

        $( ".time" ).each(function(index , elem) {
            var sendTime=  $(this).attr("data-time");
            dataString = "sendtime="+sendTime+"&q=convertTime";
            $.ajax({
                type: "POST",
                url: "data_handler.php",
                data: dataString,                   
                cache: true,
                success: function(response) {
                    alert(response);
                    $(elem).html(response);
                }
            });
        });

你不需要定义一个新变量来保护this，因为jQuery已经为你做了。

Answer 2

当您使用带回调的异步函数时，回调中的this不是来自同一个上下文。您需要将this保存在回调中使用的变量中。

试试这样：

setInterval(function() { 
            $( ".time" ).each(function( index ) {
                var sendTime=  $(this).attr("data-time");
                dataString = "sendtime="+sendTime+"&q=convertTime";
                var self = this;
                $.ajax({
                    type: "POST",
                    url: "data_handler.php",
                    data: dataString,                   
                    cache: true,
                    success: function(response) {
                        alert(response);
                        $(self).html(response);
                        //alert(response);
                    }
                });
            });
        }, 5000);

Answer 3

我认为$（this）脱离了背景。尝试：

setInterval(function() { 
            $( ".time" ).each(function( index ) {
                var $this = $(this);
                var sendTime=  $(this).attr("data-time");
                dataString = "sendtime="+sendTime+"&q=convertTime";
                $.ajax({
                    type: "POST",
                    url: "data_handler.php",
                    data: dataString,                   
                    cache: true,
                    success: function(response) {
                        alert(response);
                        $this.html(response);
                        //alert(response);
                    }
                });
            });
}, 5000);

Answer 4

setInterval(function() { 
        $( ".time" ).each(function( index ) {
            var sendTime=  $(this).attr("data-time");
            var _thisvariable = $(this);
            dataString = "sendtime="+sendTime+"&q=convertTime";
            $.ajax({
                type: "POST",
                url: "data_handler.php",
                data: dataString,                   
                cache: true,
                success: function(response) {
                    alert(response);
                    _thisvariable.html(response);
                    //alert(response);
                }
            });
        });
    }, 5000);

用Ajax响应替换div的内部HTML

4 个答案: