[Select] Add support for renderValue with native select

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Context

Thanks for making this library ❤️. I am currently using the library and am building a selectbox and when I read the docs I stumbled upon this description for renderValue: https://material-ui-next.com/api/select/#props

Important part:

Render the selected value. You can only use it when the native property is false (default).

I just wanted to ask if it’s planned to add this feature for native selectboxes as well? To be more precise: I want to have EVERY feature of material-ui-next but when I open the select box on mobile a “real” select should open. I found other libraries having this included. They build a <div> with <li> like you do already, but when you click on the <div> a <select> is triggered, so you can use both the features of the plugin AND the native select box.

Is this something you would do, or maybe something a contributor could do or would you reject both the idea and a PR? I’m not so fluent in JS, so not 100% sure if I can fix this problem without making huge BC breaks, but I wanted to know if there are any plans on doing so?

Reason is, we have a country selection where we display the country flag when a country has been selected and only display the country names when the select box is open and we wanted to use the same approach for mobile.

Your Environment

Tech	Version
Material-UI	v1.0.0-beta.29
React	16
browser	any

[markedwards]

I’m also hitting upon this requirement, integrating react-phone-number-input with MUI. Would be nice to see this supported.

[oliviertassinari]

I just wanted to ask if it’s planned to add this feature for native selectboxes as well?

@tzfrs There is no plan for such feature. I don’t think that it’s a priority. But I can understand the use case. I have already been building something similar for a date-time selector. The implementation should be straightforward, less than 10 lines of code if we move a large chunk of the logic to userland. So yes, I think that it’s a good idea 👍 .