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I think I edited the code just before you commented. I meant to say that exactly.

Here is a codepen http://codepen.io/negus/pen/wJoPeW Its still undefined

Oh, I see why I was confused: you are using an old version of React (Codepen's version is 0.13). In this version, in order to get a reference to the DOM node from the React ref, you have to use "getDOMNode()":

this.refs.list.getDOMNode().value

In updated versions of React, this is not necessary.

Man, that's super helpful. Thanks