AJAX operation performed by jQuery

1.AJAX () function

Of Ajax () function specifies two parameters. The first parameter specifies the target URL. The second parameter is a correlation parameter is assigned, the object information types or HTTP callback functions used and the like. It may be omitted first parameter, and the URL specified as the attribute of the second object parameter.

AJAX operation performed by jQuery

$.ajax('/foo', { 
    type: 'GET', 
    success: function (data, status, xhr) {  
        // 成功时将执行的处理 
    }, 
    error: function (xhr, status, errorThrown) {  
        // 失败时将执行的处理 
    } 
}); 

In Ajax () function can be specified by attribute

Property name	Explanation
url	Send the request URL targets
type	HTTP type used
timeout	overtime time. In milliseconds
async	Whether to perform asynchronous communication
crossDomain	Whether to perform cross-origin communication
isLocal	When accessing the file system and other local environment is true
data	Transmitted data object or string
processData	Whether or not the data is converted to a query string is sent
traditional	This property is used for the serialization data is converted to a query string designating used. If you specified as true, the old-fashioned way through, at the time of conversion not nested object serialization
headers	Request headers
ifModified	If the value is specified as true, the only request when the data is considered sent successfully changed
cache	Whether to use the browser cache
dataType	Specified by the data response string type. You may be designated as a xml, html, script, json and text in. Callback function will be transmitted after converting the data type specified herein
accepts	Accept header information for the specified map values. Which is a key dataType, Accept header information value is designated
mimeType	Forced to override the value of Content-Type header information
contents	Regular expression when mapping to determine the type of the response data via the Content-Type header information is used (which is a key dataType, which is a regular expression)
converters	Mapping function for analyzing the response data. Whose key is a string before conversion and the converted data type is connected to a space formed (if the html text is converted to "text html"), a value of the function
context	this in the callback function referenced objects
beforeSend(xhr, settings)	Callback function to execute before sending. If the function returns false, then the cancellation request is sent
success(data, status, xhr)	The callback function callback function error (xhr, status) executed when successful communication is executed when a communication failure
complete(xhr, status)	Callback function is executed when communication is completed. It will also perform in the success or failure
dataFilter(data, type)	Response data for the filter callback function. The function () is executed prior to the success, the result as data parameter passed to Success ()
statusCode	The mapping for specifying a callback function for each status code. Which is a key status code, a value of the function
jsonp	Parameter specifies the name of the callback function name request transmitted JSONP used. If not specified, the default parameter called callback
jsonpCallback	Callback function name JSONP request. If not specified, it is automatically set
scriptCharset	Specify the character set used when reading the script. DataType only when the script is valid or jsonp
global	Whether to trigger a global event related to AJAX
xhr	Factory for creating the XMLHttpRequest object function
xhrFields	Map XMLHttpRequest object attribute set
username	In the name of the user authentication is required to access used in the
password	In the authentication is required to access the password used in

2.AJAX () wrapper function

ajax () wrapper function function

function	Explanation
get(url, [data,] [success(data, status, xhr)] [dataType])	Communicate via the GET method. You can specify the data type of data transmitted, successful callback function, and response of
post(url, [data,] [success(data, status, xhr)] [dataType])	Communicate via a POST. Parameters and get () function is the same as
getJSON(url, [data,] [success(data, status, xhr)])	JSON data acquired by the GET method. Data can be transmitted, when the communication is successful callback specified
getScript(url, [success(data, status, xhr)])	JavaScript acquired by the GET method and execution. Can specify a callback function when communication is successful

Can be changed by ajaxSetup () function ajax () function can set the default value of the option

3. Global event

When using ajax () function will trigger multiple events. Because these events are valid for any element, so called global event. If you do not want to trigger a global event, you need to ajax () function of the global property option is set to false.

Global events event listener registration methods

Method name	Execution timing listeners
ajax start (func ())	When AJAX communication starts. Even if a plurality of communication AJAX performed simultaneously also will be executed only once
ajaxSend(func(event, xhr, options))	Before sending the request
ajaxSuccess(func(event, xhr, options))	When communication is successful
ajaxError(func(event, xhr, options, error))	When the communication failure
ajaxComplete(func(event, xhr, options))	At the end of the communication (regardless of communication success or failure)
ajax stopper (func ())	At the end of all AJAX communication