Top "Tri-state-logic" questions

For the time being, tri-state-logic may refer to logic circuits with at least one output adding a third, "high impedance" state (Z) to the binary "low" (0) and "high" (1) states as well as other contexts adding a third alternative.

How can I get angular.js checkboxes with select/unselect all functionality and indeterminate values?

I am looking for something exactly like these (tri-state checkboxes with "parents"). But using that solution wouldn't be elegant, as …

javascript html checkbox angularjs tri-state-logic
What's the best way to implement a single tri-state checkbox within angularjs?

Is there a simple way to place a single tri-state checkbox on a web-page and bind it to a boolean …

javascript angularjs checkbox tri-state-logic