Body.bodyUsed
This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.
The bodyUsed
read-only property of the Body
mixin contains a Boolean
that indicates whether the body has been read yet.
Syntax
var myBodyUsed = response.bodyUsed;
Value
A Boolean
.
Example
In our fetch request example (run fetch request live), we create a new request using the Request.Request
constructor, then use it to fetch a JPG. When the fetch is successful, we read a Blob
out of the response using blob()
, put it into an object URL using URL.createObjectURL
, and then set that URL as the source of an <img>
element to display the image.
Notice that we log response.bodyUsed
to the console once before the response.blob()
call and once after. This returns false
before and true
afterwards, as at that point the body has been read.
var myImage = document.querySelector('img'); var myRequest = new Request('flowers.jpg'); fetch(myRequest).then(function(response) { console.log(response.bodyUsed); response.blob().then(function(myBlob) { var objectURL = URL.createObjectURL(myBlob); myImage.src = objectURL; }); console.log(response.bodyUsed); });
Specifications
Specification | Status | Comment |
---|---|---|
Fetch The definition of 'bodyUsed' in that specification. |
Living Standard |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 42 [1] |
39 (39) [2] | Not supported |
29 [3] |
Not supported |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS (Gecko) | IE Phone | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Basic support | Not supported | Not supported | Not supported | Not supported | Not supported | Not supported | Not supported |
[1] Behind a preference in version 41.
[2] Behind a preference starting with version 34.
[3] Behind a preference in version 28.
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/body/bodyused