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Simple example of jQuery operating json data based on ajax

高洛峰Original: 2017-01-12 09:32:001198browse

The example in this article describes how jQuery operates json data based on ajax. Share it with everyone for your reference, the details are as follows:

jQuery Ajax example demonstration

The three formats of jQuery Ajax can be either json format or xml format when interacting with the background data. , I recommend converting the data into json format.

Comparison between In tag format, it’s hard to tell the winner.

2. Scalability

XML is naturally very scalable, and JSON certainly has it. There is nothing that XML can expand that JSON cannot.

3. Coding Difficulty

XML has a wealth of coding tools, such as Dom4j, JDom, etc. JSON also has tools provided by json.org, but JSON coding is obviously much easier than XML, even if it is not JSON code can also be written with the help of tools, but it is not easy to write XML well.

4. Decoding Difficulty

The parsing of XML must consider the child nodes and parent nodes, which makes people dizzy, while the parsing difficulty of JSON is almost 0. XML loses really nothing at this point.

<html>
<head>
<title>jQuery Ajax 实例演示</title>
</head>
<script language="javascript" src="../lib/jquery.js"></script>
<script language="javascript">
$(document).ready(function ()
{
  $(&#39;#send_ajax&#39;).click(function (){
   var params=$(&#39;input&#39;).serialize(); //序列化表单的值
   $.ajax({
    url:&#39;ajax_json.php&#39;, //后台处理程序
    type:&#39;post&#39;,     //数据发送方式
    dataType:&#39;json&#39;,   //接受数据格式
    data:params,     //要传递的数据
    success:update_page //回传函数(这里是函数名)
   });
  });
//$.post()方式：
$(&#39;#test_post&#39;).click(function (){
  $.post(
   &#39;ajax_json.php&#39;,
   {
    username:$(&#39;#input1&#39;).val(),
    age:$(&#39;#input2&#39;).val(),
    sex:$(&#39;#input3&#39;).val(),
    job:$(&#39;#input4&#39;).val()
   },
   function (data) //回传函数
   {
    var myjson=&#39;&#39;;
    eval(&#39;myjson=&#39; + data + &#39;;&#39;);
    $(&#39;#result&#39;).html("姓名:" + myjson.username + "<br/>工作:" + myjson[&#39;job&#39;]);
   }
  );
  });
//$.get()方式：
$(&#39;#test_get&#39;).click(function ()
 &#39;ajax_json.php&#39;,
   {
    username:$("#input1").val(),
    age:$("#input2").val(),
    sex:$("#input3").val(),
    job:$("#input4").val()
   },
   function(data) //回传函数
   {
    var myjson=&#39;&#39;;
    eval("myjson=" + data + ";");
    $("#result").html(myjson.job);
   }
  );
});
});
function update_page (json) //回传函数实体，参数为XMLhttpRequest.responseText
{
var str="姓名:"+json.username+"<br />";
str+="年龄:"+json.age+"<br />";
str+="性别:"+json.sex+"<br />";
str+="工作:"+json.job+"<br />";
str+="追加测试:"+json.append;
$("#result").html(str);
}
</script>
<body>
<div id="result" style="background:orange;border:1px solid red;width:300px;height:200px;"></div>
<form id="formtest" action="" method="post">
  <p><span>输入姓名:</span><input type="text" name="username" id="input1" /></p>
  <p><span>输入年龄:</span><input type="text" name="age" id="input2" /></p>
  <p><span>输入性别:</span><input type="text" name="sex" id="input3" /></p>
  <p><span>输入工作:</span><input type="text" name="job" id="input4" /></p>
</form>
<button id="send_ajax">提交</button>
<button id="test_post">POST提交</button>
<button id="test_get">GET提交</button>
</body>
</html>

PHP file ajax_json.php:

<?php
//$arr = $_POST; //若以$.get()方式发送数据，则要改成$_GET.或者干脆:$_REQUEST
$arr = $_REQUEST;
$arr[&#39;append&#39;] = &#39;测试字符串&#39;;
//print_r($arr);
$myjson = my_json_encode($arr);
echo $myjson;
function my_json_encode($phparr)
{
  if(function_exists("json_encode"))
  {
   return json_encode($phparr);
  }
  else
  {
   require_once &#39;json/json.class.php&#39;;
   $json = new Services_JSON;
   return $json->encode($phparr);
  }
}
?>

I hope this article will be helpful to everyone in jQuery programming.

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