jQuery parsing json data example analysis_jquery
This article analyzes the method of jQuery parsing json data through examples. Share it with everyone for your reference, the details are as follows:
Let’s take a look at our Json data format first:
[
{id:01,name:"小白",old:29,sex:"男"},
{id:02,name:"小蓝",old:29,sex:"男"},
{id:03,name:"小雅",old:29,sex:"男"}
]
In order to eliminate the problem of garbled characters, we set up a filter (code snippet)
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
resp.setCharacterEncoding("UTF-8");
resp.setContentType("text/html;charset=UTF-8");
chain.doFilter(req, resp);
}
On the server side, I use Servlet to generate json data (code snippet).
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter(); //过滤器已经做过编码转化了。 resp.setContentType("text/html;charset=UTF-8");
StringBuffer sb = new StringBuffer();
sb.append("[{id:01,name:\"小白\",old:29,sex:\"男\"},");
sb.append("{id:02,name:\"小蓝\",old:29,sex:\"男\"},");
sb.append("{id:03,name:\"小雅\",old:29,sex:\"男\"}]");
out.print(sb);
}
JQuery code on the page:
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>json学习</title>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
<script type="text/javascript" src="jslib/jquery.js" charset="UTF-8"></script>
<script type="text/javascript" charset="UTF-8">
$(document).ready(function() {
var select = $("#select");
$.get("json.do", null, function(data) {
var jsonData = eval(data);//接收到的数据转化为JQuery对象，由JQuery为我们处理
$.each(jsonData, function(index, objVal) { //遍历对象数组，index是数组的索引号，objVal是遍历的一个对象。
//val["属性"]可取到对应的属性值。
$("<option>").attr("value", objVal["id"]).html(objVal["name"]).appendTo(select);
});
});
});
</script>
</head>
<body>
<select id="select"></select>
</body>
</html>
In order to save trouble before, I wrote the json data into json.txt and json.jsp without using Servlet encapsulation, but then I used Firebug to debug it
The json data written to .jsp and .txt files was not parsed. I debugged it in Firebug and found that the breakpoint at line 10 ended directly in the next step.
There is no traversing the object array. So I tested them separately
Text file json.txt
jsp file json.jsp
Servlet json.do
For the returned data, the browser can only parse the data returned by the Servlet as json data
I hope this article will be helpful to everyone in jQuery programming.
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