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jquery implementation of AJAX asynchronous request implementation of provincial and municipal linkage (data transfer format JSON)

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JSON Overview: JavaScript Object notation is a lightweight data interchange format.
JSON is essentially a string of data formats;
JavaScript can parse JSON directly, because JSON itself is an acoustic JavaScript data format. (JSON is an array or object inside JS)

JSON syntax rules:

The data is in the key value pair;
Data is separated by commas;
Curly braces Save the object;
Square brackets Save the array;

The JSON value can be:

Number (positive or floating point);
String (in double quotes);
Logical value (TRUE or false);
Array (in square brackets);
Object (in curly braces);
Null

eg:         1: {"Key1": value1, "Key2": value2,...}         2:  [{"Key1": value1, "Key2": value2,...},{"Key1": value1, "Key2": value2,...},...]
a simple JSON data format example 
{            "city": {"cid": 1, "CNAME": "Beijing"}        }
Complex JSON Data example (there is a nesting between array objects)In the server-side JSON data generation tool:

1.fastjson Tools

2.json-lib Tools:

1 Jsonarray jsonarray = jsonarray.fromobject (list); // Converts an array or list collection to JSON; 2             // Jsonobject.fromobject (object):     // turns the object or map collection into JSON; 3             Response.setcontenttype ("Text/xml;charset=utf-8"); 4             Response.getwriter (). Print (jsonarray.tostring ()); // to respond to Jsonarray data in string form
Json-lib Example 1 
1 //The Jsonconfig object can be used when the returned object data needs to be filtered for extra information. 2Jsonconfig config =Newjsonconfig ();3Config.setexcludes (Newstring[]{"pid"});//sets the filtered member field as a string array,4Jsonarray Jsonarray = Jsonarray.fromobject (list,config);//overloads of the Fromobject method, passing jsonconfig into the5                 //Jsonobject.fromobject (object)6Response.setcontenttype ("Text/html;charset=utf-8");7Response.getwriter (). Print (jsonarray.tostring ());
Json-lib Example 2Parsing JSON data on the client: 
1 <HTML>2 <Head>3 <Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8">4 <title>Hello Miss Dang</title>5 </Head>6 <Scriptsrc= "${pagecontext.request.contextpath}/js/jquery-1.11.3.min.js"></Script>7 <Scripttype= "Text/javascript">8     $(function(){9         $("#province"). Change (function(){Ten             varPID= $( This). Val (); One $.post ("${pagecontext.request.contextpath}/cityjsonservlet",{"PID":p ID},function(data) { A                 $("#city"). HTML ("<option>-Please select-</option>"); - $ (data). each (function(i,n) { -                     $("#city"). Append ("<option value = '"+N.cid+"' >"+N.cname+"</option>"); the                 }); -             },"JSON"); -         }); -     }); + </Script> - <Body> +     <form> A         <SelectID= "Province"> at             <option>-Please select province-</option> -             <C:foreachvar= "I"Items= "${list}"> -                 <optionvalue= "${i.pid}">${I.pname}</option> -             </C:foreach> -         </Select> -         <SelectID= "City"> in         </Select> -     </form> to </Body> + </HTML>
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jquery implementation of AJAX asynchronous request implementation of provincial and municipal linkage (data transfer format JSON)

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