XMLHttpRequest
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It's an object which is supported by all modern browsers now a days to run AJAX
Syntax - To declare XMLHttpRequest object
new XMLHttpRequest();var xhr = new XMLHttpRequest();- XMLHttpRequest object must be declared to perform background operation(s)
XMLHttpRequest object contains predefined methods & properties to perform communication with server in background
- turned_in_notMethods
Methods Description abort()To cancel the current request open(method,url,async,user,pwd)Request settings,
method: Request type (like: GET, POST, HEAD)
url: URL Path
async: Asynchronous true/false
user: username for url authentication (if any)
pwd: password for url authentication (if any)send()Request the server using GET method send(data)Request the server using POST method setRequestHeader(header,value)To send any header to the server getResponseHeader(headerName)Returns specific response header value getAllResponseHeaders()Returns all response header values
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Properties Description onreadystatechange Defines a function, called if readyState property changes readyState Holds the status-code of the XMLHttpRequest
0: request not initialized
1: server connection established
2: request received
3: processing request
4: request finished and response is readystatus Returns the status-code of a request
200: "OK",
404: "Not Found",
Many more Http Message & codesstatusText Returns the status-text (e.g. "OK" or "Not Found") responseText To access the response data as a string responseXML To access the XML response data responseURL Returns the response url
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