Disable log in button on submit

[DiegoCardoso]

Disables log in button on the submit action. User can re-enable it again by removing disabled attribute.

Fixes #9

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This change is 

[coveralls]

Pull Request Test Coverage Report for Build 73

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.2%) to 95.349%

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Totals
Change from base Build 67:	1.2%
Covered Lines:	23
Relevant Lines:	23

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💛 - Coveralls

[alexberazouski]

Reviewable status: 0 of 2 files reviewed, 1 unresolved discussion (waiting on @DiegoCardoso)

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src/vaadin-login.html, line 207 at r1 (raw file):

        submit() {
          if (!this.disabled) {
            this.$.loginForm.submit();

The button becomes disabled even if the form is invalid. So actual submit didn't happen, but the button is already disabled. We could use the same logic for button click as for enter press.

[DiegoCardoso]

Reviewable status: 0 of 2 files reviewed, 1 unresolved discussion (waiting on @alexberazouski)

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src/vaadin-login.html, line 207 at r1 (raw file):

Previously, alexberazouski wrote…

The button becomes disabled even if the form is invalid. So actual submit didn't happen, but the button is already disabled. We could use the same logic for button click as for enter press.

Good catch, thanks! Done.

[alexberazouski]

Reviewed 2 of 2 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved