- From: Simon Pieters <simonp@opera.com>
- Date: Wed, 14 Dec 2011 07:41:12 +0100
- To: "Web Applications Working Group WG (public-webapps@w3.org)" <public-webapps@w3.org>, "Adrian Bateman" <adrianba@microsoft.com>
- Cc: "Feras Moussa" <ferasm@microsoft.com>
On Wed, 14 Dec 2011 01:52:04 +0100, Adrian Bateman <adrianba@microsoft.com> wrote: > At TPAC [1,2] I described our proposal for adding an isReusable flag to > createObjectURL. A common pattern we have seen is the need for a blob URL > for a single use (for example, loading into an <img> element) and then > revoking the URL. This requires a fair amount of boilerplate code to > handle the load/error events. > > createObjectURL is modified as follows: > > static DOMString createObjectURL(Blob blob, [optional] bool isReusable); > > The value of isReusable defaults to true if it is not supplied and this > results in the behaviour documented for File API today. However, if you > supply false for the flag then the first dereference of the URL revokes > it. Could the argument have inverted semantics? Optional arguments that default to true are a bit confusing. Usually omitted boolean arguments default to false. > This means that you can do something like: > > imgElement.src = URL.createObjectURL(blob,false) > > and not worry about having to call URL.revokeObjectURL to release the > Blob. > > We have implemented this in experimental form in IE10 preview builds and > it works well. There seemed to be a fair amount of support at TPAC and > we're > hoping this will be adopted in the File API spec. > > Thanks, > > Adrian. > > [1] http://www.w3.org/2011/11/01-webapps-minutes.html#item02 > [2] http://pages.adrianba.net/w3c/FilesAndStreams.pdf > > -- Simon Pieters Opera Software
Received on Wednesday, 14 December 2011 06:44:12 UTC