This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The read-only size property of the Metadata interface specifies the size, in bytes, of the referenced file or other file system object on disk.
var size = Metadata.size;
A number indicating the size of the file in bytes.
This example checks the size of a log file and removes it if it's larger than a megabyte.
workingDirectory.getFile("log/important.log", {}, function(fileEntry) {
fileEntry.getMetadata(function(metadata) {
if (metadata.size > 1048576) {
fileEntry.remove(function() {
/* log file removed; do something clever here */
});
}
});
}, handleError);
| Specification | Status | Comment |
|---|---|---|
| File and Directory Entries API The definition of 'size' in that specification. | Draft | Initial specification. |
This API has no official W3C or WHATWG specification.
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 13 | ? | No | No | No | No |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | No | Yes | ? | No | No | No | ? |
MetadataFileSystemEntry.getMetadata()FileSystemFileEntry
© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Metadata/size