Dropdown: Add public interface to get selected value

[peterremote1980]

Hi
i can:

let gender: Dropdown = this.refs['gender'] as Dropdown

But the object gender has no property for the selected value, please help
thanks
Peter

[mikewheaton]

Here's a CodePen that logs the reference each time the dropdown is changed: https://codepen.io/mikewheaton/pen/pqmLeK?editors=0010

I don't see a way to get the selected value directly from the reference object. Could you provide some more details on what you're building? You'll likely want to use the onChange prop to provide a function that updates the parent component's state, so that you can access the selected value.

[micahgodbolt]

@mikewheaton this is a pretty low hanging fruit addition to dropdown's public interface. For any control that can be used uncontrolled, we should have have a public getter for the current value.

[joschect]

Even though this isn't a huge change I think that we could batch it into #6030

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