Add input:file support (feature request for 1.3)

[alonisser]

that would be great and much needed

[alonisser]

Basically it should allow

1. built in validation (has a file been uploaded?, what kind of file?)
2. Modern Ajax file upload
   3.. drag and drop would be nice to have

lots of the functionality (but not all of it) can be currently supplied by Danial farid: angular-file-upload but native (out of the box) support would be nice

[wesleycho]

This has come up from time to time, but there are some difficult aspects with inputs with type file. For one, HTML5 spec prevents you from modifying the file attached to the input via javascript, so any ng-model implementation (if that is the route taken) could only be a one way binding.

File uploading with Angular is easy enough with $http, although currently there is no way to hook into the xhr progress event. #2725 brings $q.notify into the fold for creating a mechanism for using an event, but finding a good way to implement this in Angular itself is not immediately obvious to me (the implementation should lie in httpBackend.js though).

As for dragging and dropping, I'm not sure whether anything more should be added into the Angular core for handling that. It isn't a particularly hard thing to implement if you create directives for the drop event.

[IgorMinar]

duplicate of #1236 and #1375