JQuery ajax and jqueryajax

JQuery ajax and jqueryajax
Instance

Load JSON data from test. js and display a name field in JSON data:

$.getJSON("test.js", function(json){  alert("JSON Data: " + json.users[3].name);});

 

Definition and usage

Load JSON data using http get requests.

In jQuery 1.2, you can use a callback function in the form of JSONP to load JSON data of other domains, such as "myurl? Callback =? ". Will jQuery be replaced automatically? For the correct function name to execute the callback function. Note: The Code after this row will be executed before the callback function is executed.

Syntax

jQuery.getJSON(url,[data],[callback])

Parameters	Description
Url	The URL of the page to be loaded.
Data	The Key/value parameter to be sent.
Callback	The callback function executed when the load is successful.

Detailed description

This function is short for Ajax functions and is equivalent:

$.ajax({  url: url,  data: data,  success: callback,  dataType: json});

The data sent to the server can be appended to the URL as a query string. IfDataIf the parameter value is an object (ing), it is converted to a string and URL encoded before being appended to the URL.

PassCallbackThe returned data can be a JavaScript object or an array defined in the JSON structure, and the $. parseJSON () method is used for parsing.

More instance example 1

Load four latest pictures about cats from the Flickr jsonp api:

HTML code:

<div id="images"></div>

JQuery code:

$.getJSON("http://api.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any&format=json&jsoncallback=?", function(data){  $.each(data.items, function(i,item){    $("Example 2
Load JSON data from test. js and add parameters to display a name field in JSON data:
$.getJSON("test.js", { name: "John", time: "2pm" }, function(json){  alert("JSON Data: " + json.users[3].name);});