In Javascript how can I set rgba without specifying the rgb?

Question

I have an HTML element whose background colour is set with rgba()

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Answer 1

After some playing around, and the discovery of getComputedStyle, I have put together this.

  
    
    
  
  
    

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• Make sure you define in your css your values, and cascade because RGBA is CSS3.
• Also see that you can pass in a number >1 for alpha and it will divide by 100 for you (I hate working with decimals when thinking percentages).
• Enjoy!