Force a model value to be changed via ngKeypress doesn't reflect the ngValue on itself

[betonetotbo]

I'm submitting a ...

• bug report
• feature request
• other (Please do not submit support requests here (see above))

Current behavior:
Force a model value to be changed via ngKeypress doesn't reflect the ngValue on itself.

Expected / new behavior:
After change the value, the ngValue must be evaluated and the input value must be updated.
Using angular 1.6.x this doesn't occurs.

Minimal reproduction of the problem with instructions:
https://codepen.io/betonetotbo/pen/LyMNpK

Angular version: 1.5.8

Browser: [Chrome 58]

[gkalpak]

This is expected behavior and is related tot he fact that in v1.5.x, ngValue only modifies the value attribute, not the value property. This has changed in v1.6.x, so that ngValue updates both the attribute and the property, thus reflecting expression changes to the input's value.

The reason it does initially work in v1.5.x (where only the value attribute is updated), is because of how the spec defines the behavior in case the input is not dirty:

The value content attribute gives the default value of the input element. When the value content attribute is added, set, or removed, if the control's dirty value flag is false, the user agent must set the value of the element to the value of the value content attribute, if there is one, or the empty string otherwise [...].