1// Limit/fix max number of items user can select via checkbox
2
3var checks = document.querySelectorAll(".selected_products");
4var max = 2;
5for (var i = 0; i < checks.length; i++)
6  checks[i].onclick = selectiveCheck;
7
8function selectiveCheck(event) {
9  var checkedChecks = document.querySelectorAll(".selected_products:checked");
10  if (checkedChecks.length >= max + 1){
11    alert("Maximum Items Selected")
12    return false;
13  }
14}