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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
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| 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
- The
ProgressEventinterface it belongs to.