A good way for JavaScript to explain the JSON returned by Ajax (recommended) _javascript tips

Source: Internet
Author: User
Tags eval

Typically, the AJAX request returns a format of JSON or XML, and if JSON is returned, it can be manipulated by converting to a JavaScript object, as follows:

1, controller implementation of Ajax request

@RequestMapping public
void Getlocations (@RequestParam String location, PrintWriter printwriter) { 
  if ( Stringutils.isempty (location)) {return 
    ; 
  } 
  list<location> locations = locationservice.getsublocation (Location); 
  String json = Json.tojson (locations); 
  Printwriter.write (JSON); 
  Printwriter.flush (); 
  Printwriter.close (); 
} 

Location are beans that contain multiple properties, such as PName, Zname.

2. AJAX processing request and return value

$.ajax ({ 
  type: "Get", 
  URL: "/admin/location/getlocations.do", 
  data: "location=" + val, 
  success: Function (msg) { 
    msg = eval (msg); 
    Region = $ ("#region"); 
    Region.empty (); 
    vhtml = "<option value= ' None ' > select area (optional) </option>"; 
    $.each (msg, function (i) { 
      var $bean = msg[i]; 
      vhtml = ' <option value= ' + $bean. PName + ' "" > '
          + $bean. Zname + ' </option> '; 
    }); 
    Region.html (vhtml); 
  } 
); 

MSG would have been a JSON string, using the Eval function to turn the string into a JavaScript object, so that you could get the value of the property as an object.

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