04. AJAX to fetch JSON data from an External URL | AJAX Tutorial | UiBrains | NAVEEN SAGGAM 

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04. AJAX to fetch JSON data from an External URL | AJAX Tutorial | UiBrains | NAVEEN SAGGAM
The onreadystatechange Property
The readyState property holds the status of the XMLHttpRequest.
The onreadystatechange property defines a function to be executed when the readyState changes.
The status property and the statusText property holds the status of the XMLHttpRequest object.
Property Description
Onreadystatechange
Defines a function to be called when the readyState property changes
readyState Holds the status of the XMLHttpRequest.
0: request not initialized
1: server connection established
2: request received
3: processing request
4: request finished and response is ready
Status
200: "OK"
403: "Forbidden"
404: "Page not found"
statusText
Returns the status-text (e.g. "OK" or "Not Found")
Note: The onreadystatechange function is called every time the readyState changes.
When readyState is 4 and status is 200, the response is ready.