select: form remains valid in a required md-select when empty option is selected

[dephiros]

Actual Behavior:

• What is the issue? *
  • mdSelect with "required" set in a form; use as empty option to clear select
  • select a non-empty option, form become valid
  • select empty option, form remains valid
• What is the expected behavior?
  • form should become invalid

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue: http://codepen.io/dephiros/pen/ObMqBY?editors=1000
• Details:

Angular Versions: *

• Angular Version: 1.5.5
• Angular Material Version: 1.1.1

Additional Information:

• Browser Type: * chrome
• Browser Version: * latest
• OS: * macOS
• Stack Traces:

[topherfangio]

I don't think I am understanding your use-case. If the field is required, you shouldn't have any empty option right?

[dephiros]

The requirement that I have designing the form is all select should have the an empty option to clear the select after user selecting a valid value. We just use this as the standard select across everywhere in the application regardless if the field is required or not

[topherfangio]

I guess if you're attempting to use these together, it does seem like the md-option-empty should indeed reset the validity of the model. However, I'll leave this to @ThomasBurleson's judgement as to whether or not this should be considered a bug.

[Splaktar]

This updated CodePen demonstrates how this is still an issue in 1.1.20 in addition to providing a side-by-side comparison to a regular select with AngularJS. This certainly seems like a bug that needs to be fixed.

Reference: https://stackoverflow.com/questions/12654631/why-does-angularjs-include-an-empty-option-in-select