Disabled button can still be tapped multiple times before component rerender

[josephk96]

Consider a button that sets disabled={this.state.hasSent} and onClick={this.state.hasSent ? null : this.sendMoney}. If sendMoney sets hasSent to true, the product developer expectation is that onClick will not fire again. Otherwise two fast clicks can send the money twice, and that is a very error-prone conceptual model.

In this example, you've set both the disabled attribute and checked that flag in the onClick handler. Does this mean that it's not sufficient to only set the disabled attribute and that you also need to check inside the click handler to prevent these kinds of click more than once issues?

Originally posted by @johnywith1n in facebook/react#11171 (comment)