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Detailed example of simple non-refresh comment function implemented by jQuery

小云云Original: 2017-12-23 10:21:301994browse

When we browse articles or other related content, we want to read comments but don’t want to refresh. How to implement this function? This article mainly introduces the simple non-refresh comment function implemented by jQuery, involving implementation techniques related to jQuery event response and dynamic operation of page element attributes. The code is equipped with more detailed comments for easy understanding. Friends who need it can refer to it. I hope it can help everyone. .

The example in this article describes the simple non-refresh comment function implemented by jQuery. Share it with everyone for your reference, the details are as follows:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
 <title>无刷新评论 - www.jb51.net</title>
 <script src="jquery-1.7.2.min.js" type="text/javascript"></script>
 <script type="text/javascript">
  //========================================================设定样式
  $(function () {
   var isFirst = true;
   $("#text1").css("color", "grey").focus(function () {
    if (isFirst) //判断用户是否第一次输入，如果是第一次输入，就将当前控件的值设为空
     $(this).val("");
    $(this).css("color", "Black")
   });
   $("#text1").bind("keydown", function () {//#text1控件绑定 keydown事件，当它被按下的时候就触发function()匿名函数，将isFirst设为false【这时候将isFirst设为fasle，那就么代表它不是第一次输入了。所以第二次点击#text1控件的时候它就不会将#text1的值设为空了】
    isFirst = false;
   });
   $("#text1").blur(function () {
    if ($(this).val().length <= 0) { //如果在失去焦点的时候用户名的长度<=0的话就重新提示用户"请输入用户名"
     $(this).css("color", "grey").val("请输入用户名")
    }
   })
  })
  $(function () {
   var isFirst = true;
   $("#text2").css("color", "grey").focus(function () {
    if (isFirst) //判断用户是否第一次输入，如果是第一次输入，就将当前控件的值设为空
     $(this).val("");
    $(this).css("color", "Black")
   });
   $("#text2").bind("keydown", function () {//#text1控件绑定 keydown事件，当它被按下的时候就触发function()匿名函数，将isFirst设为false【这时候将isFirst设为fasle，那就么代表它不是第一次输入了。所以第二次点击#text1控件的时候它就不会将#text1的值设为空了】
    isFirst = false;
   });
   $("#text2").blur(function () {
    if ($(this).val().length <= 0) { //如果在失去焦点的时候用户名的长度<=0的话就重新提示用户"请输入用户名"
     $(this).css("color", "grey").val("请输入评论的内容")
    }
   })
  })
  //==========================================================================实际内容
  $(function () {
   $("#btn1").click(function () {
    var tr = $("<tr><td>" + $("#text1").val() + ":" + "</td><td>" + $("#text2").val() + "</td></tr>")
    $("#table1").append(tr);
   })
  })
 </script>
</head>
<body>
<p>.......这是我的帖子，请大家评论。</p>
<table id="table1"></table>
<input type="text" value="请输入用户名" id="text1"/><br />
<textarea cols="20" rows="8" id="text2">请输入评论内容</textarea>
<input type="button" value="提交" id="btn1"/>
</body>
</html>

The running effect is as follows:

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