ProgressEvent.lengthComputable

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The ProgressEvent.lengthComputable read-only property is a Boolean flag indicating if the resource concerned by the ProgressEvent has a length that can be calculated. If not, the ProgressEvent.total property has no significant value.

Syntax

flag = ProgressEvent.lengthComputable

Specifications

Specification Status Comment
XMLHttpRequest
ProgressEvent.lengthComputable
Living Standard  

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support 未实现 (Yes) 3.5 (1.9.1) 未实现 未实现 未实现
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 未实现 (Yes) 1.0 (1.9.1) 未实现 未实现 未实现

See also

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