How can I make an HTML multiple select act like the control button is held down always

Question

I have a web application I\'m working on that requires a HTML multiple select element operates like the control key is held down at all times. I.e. click on an option will

Answer 1

You may want to consider a simpler solution, like using a list of checkboxes inside a div whose overflow property is set to scroll. That might work out better for you. Getting a drop down to do what you've asked is a bit involved.

See this for example:

label{display:block;}
    #container{height:100px;width:200px;overflow:scroll;}

        Option 1
        Option 2
        Option 3
        Option 4
        Option 5
        Option 6
        Option 7
        Option 8
        Option 9
        Option 10
        Option 11
        Option 12