JavaScript uses AJAX events

Events defined by the XMLHttpRequest object:

abort--triggered when the request is terminated (progressevent);

error--triggered when the request fails (progressevent);

load--triggered upon successful completion of the request (progressevent);

loadend--triggered when the request is complete, regardless of success or error (progressevent);

loadstart--triggered at the start of the request (progressevent);

progress--trigger to indicate the progress of the request (progressevent);

readystatechange--Trigger (Event) at different stages of the request life cycle;

timeout--triggered if the request timed out (progressevent);

Note: Given that browser support for other events is not in place, ReadyStateChange is currently the only event that can reliably track the progress of a request.

Additional properties defined by the Progressevent object:

lengthcomputable--returns True if the length of the data stream can be computed;

loaded--returns the amount of data currently loaded;

total--returns the total amount of data available;

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JavaScript uses AJAX events