-Manish Goregaokar On Wed, Mar 16, 2016 at 1:37 AM, Manish Goregaokar <manishea...@gmail.com> wrote:
> > On Tue, Mar 15, 2016 at 3:13 PM, Zhen Zhang <izgz...@gmail.com> wrote: > >> >> 1. About FileList API, It is said to be *at risk* to be replaced by >> Array. <https://w3c.github.io/FileAPI/#filelist-section> Do we have to >> take this into consideration? > > > We still need to implement it, since the `files` attribute for form inputs > is quite useful and the spec hasn't yet changed to make it an array. So no, > not really, though if you'd like to not implement this and spend more time > working on something else that's totally fine. > > >> 2. Although I read nearly everything I can get from input element, form >> element, Blob interface …, but I am still having a hard time trying to >> understand *when a file on disk got read into the memory and used to >> construct a Blob object*. >> > > See https://w3c.github.io/FileAPI/#blob, especially the first three > lines, as well as the first two lines and the blue box here > <https://w3c.github.io/FileAPI/#file>. Basically, Blobs/Files can be > in-memory blobs (our current Blob implementation handles this), but they > can also refer to on-disk blobs which have not been read into memory. So, > if a blob is to be constructed from on-disk data, the disk data is not read > into memory at all, instead the blob will just contain an open file > descriptor and a byte range, or something similar. If the file changes in > the meantime, errors might be thrown > <https://w3c.github.io/FileAPI/#ErrorAndException> (though I don't think > this happens in practice except for permissions errors). > > You can test this by creating a simple HTML page with a file upload, and > verifying that if the file changes in the filesystem, reading the File > object (accessed via input_element.files[0], read via URL.createBlobURI) > before and after the change will give different results even if the file > object was not touched on the javascript side. > > (interestingly, blobs referring to on-disk data pin their `size` and > `lastModified` fields to the values on creation, and this isn't updated at > all even though an access of the data will get you up to date data) > > >> 3. Drag & Drop <http://www.sitepoint.com/html5-file-drag-and-drop/> of >> selecting files from file system — This looks related, but I don’t know if >> we should pay more attention to it. >> > > It's possible to do. However, this first needs regular dragdrop event > support, which might not be as easy to implement. It additionally will need > handling of file dragdrop in Glutin. This might take up a lot more time > than we want it to. > > >> 4. What is the idea behind using GenerationId >> <https://doc.servo.org/script/dom/htmlformelement/struct.GenerationId.html>? >> I am a bit confused because there is little doc about it. >> > > It takes part in planned navigation > <https://html.spec.whatwg.org/multipage/#planned-navigation>. This > basically handles cases where a form submit button is clicked once, but > before the page navigates you quickly change one of the inputs and submit > again. Each submission event is queued as part of "planned navigation", but > the first submission event will have an outdated generation id (which is > bumped every time the form is submitted), and only the second navigation > event will happen. > > Thanks, > -Manish Goregaokar > _______________________________________________ dev-servo mailing list dev-servo@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-servo
