Create a complete index.html page
First let’s look at the function of reading the comment list. When the page is loaded, use the getJSON method to read it. The JSON data generated by server-side PHP is displayed to the user.
It can be seen that the JSON data needs to be read through the $.each loop, because the generated JSON data has multiple comments. Of course you can also use a for loop, but I prefer to use jQuery's $.each loop.
Let’s take a look at the front-end code of the comment function.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>发表评论</title>
<style type="text/css">
.demo{
width:500px;
margin: 0 auto;
}
h3{
font-size:18px
}
#comments{
margin:10px auto
}
#post{
margin-top:10px
}
#comments p,#post p{
line-height:30px
}
#comments p span{
margin:4px; color:#999
}
#message{
position:relative;
display:none;
width:100px;
padding:4px;
margin-top:-100px;
margin-left:30px;
background: #ff0000;
color: #c286ff;
z-index:1001
}
</style>
<script src="//cdn.bootcss.com/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
var comments = $("#comments");
$.getJSON("server.php",function(json){
$.each(json,function(index,array){
var txt = "<p><strong>"+array["user"]+"</strong>："+array["comment"]+"<span>"+array["addtime"]+"</span></p>";
comments.append(txt);
});
});
$("#add").click(function(){
var user = $("#user").val();
var txt = $("#txt").val();
$.ajax({
type: "POST",
url: "comment.php",
data: "user="+user+"&txt="+txt,
success: function(msg){
if(msg==1){
var str = "<p><strong>"+user+"</strong>："+txt+"<span>刚刚</span></p>";
comments.append(str);
$("#message").show().html("发表成功！").fadeOut(1000);
$("#txt").attr("value","");
}else{
$("#message").show().html(msg).fadeOut(1000);
}
}
});
});
});
</script>
</head>
<body>
<div class="demo">
<div id="comments">
<h3>评论列表</h3>
</div>
<div id="post">
<h3>发表评论</h3>
<p>昵称：</p>
<p><input type="text" class="input" id="user" /></p>
<p>评论内容：</p>
<p><textarea class="input" id="txt" style="width:100%; height:80px"></textarea></p>
<p><input type="submit" value="发表" id="add" /></p>
<div id="message"></div>
</div>
</div>
</body>
</html>Let's write our PHP page
