The buttons are created using a template node with a background color of green. While this isnt truly a node-red question Im posing it here as I really dont know where else to ask such a question. I have eight relays controlled by eight buttons on a page. In many cases you would see just the red color being used (or even just the red symbol on a regular button). Node red button template using CSS change colors. A couple options are: give it a different shape - circular button - and highlight it - red color. The record button demanded some extra affordance so that it was not accidentally pressed (overwriting something which you wanted to hear!). But, a good explanation would be: All the other controls on a radio/cassette player were rectangular in shape. I have even seen some microphones with a small red indicator on when the device is on.Īs far as the button's shape goes, I do not think it has that much history in it apart from a couple trend setters. And it can be easily used in social context: Rather than 'telling' someone that you are recording and they should not make a sound, you can just point to the red dot on your microphone/recorder and they would understand the situation. This is highly desirable when you are recording something. It acts as a signal to someone who might not be aware of what is going on, to prevent them from interrupting the process. The reason behind that would be the same - it is highly noticeable in the human visible color field. I would attempt to connect the dots between recording and red button like this:Īpart from the traditional warning usage, a red light has been used in many scenarios to represent on-going work - radio show room when on air, operation theater when operation is going on, etc.
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