how to make a background-color on a div tag

Question

I have this code:

 

    


        
  
  
         


        
                      

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Answer 1

You're looking for the style property on the element, there is no background-color attribute:

document.getElementById("pic1").style.backgroundColor = "red";

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That said, generally best to style things with CSS and add/remove classes.

Answer 2

T.J. Crowder beat me to it, but just as a demo, if you were hellbent on using setAttribute, you could do so like this:

document.getElementById("pic1").setAttribute("style","background-color:red");

As you see, the css attribute is background-color, not the html attribute.