Only one selected checkbox

Question

I have 15 check boxes in a form. This checkboxes are independent to eachother. I want a javascript function that makes, when user is selecting 2 checkboxes, the first checke

Answer 1

I created this CodePen off of John's answer, but I added the ability to uncheck all checkboxes.

HTML:

  

    

  
     Option 1
  

    

  
     Option 2
  


  
   Option 3
  


  
   Option 4
  

JavaScript:

function selectOnlyThis(id) {
for (var i = 1;i <= 4; i++){
    if ("Check" + i === id && document.getElementById("Check" + i).checked === true){
            document.getElementById("Check" + i).checked = true;
            } else {
              document.getElementById("Check" + i).checked = false;
            }
    }  
}

https://codepen.io/thomasweld/pen/Pmaega?editors=1010