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The ProgressEvent() constructor returns a newly created ProgressEvent, representing the current completion of a long process.

Syntax

progressEvent = new ProgressEvent(type, {lengthComputable: aBooleanValue, loaded: aNumber, total: aNumber});

Arguments

The ProgressEvent() constructor also inherits arguments from Event().

type
Is a DOMString representing the name of the type of the ProgressEvent. It is case-sensitive.
lengthComputable Optional
Is a Boolean flag indicating if the total work to be done, and the amount of work already done, by the underlying process is calculable. In other words, it tells if the progress is measurable or not. It defaults to false.
loaded Optional
Is an unsigned long long representing the amount of work already performed by the underlying process. The ratio of work done can be calculated with the property and ProgressEvent.total. When downloading a resource using HTTP, this only represent the part of the content itself, not headers and other overhead. It defaults to 0.
total Optional
Is an unsigned long long representing the total amount of work that the underlying process is in the progress of performing. When downloading a resource using HTTP, this only represent the content itself, not headers and other overhead. It defaults to 0.

Specifications

Specification Status Comment
XMLHttpRequest
The definition of 'ProgressEvent()' in that specification.
Living Standard

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 22.0 (22.0) No support No support No support
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support 22.0 (22.0) No support No support No support

See also

 

Document Tags and Contributors

 Last updated by: DomenicDenicola,