Uncheck a checkbox if another checked with javascript

Question

I have two checkbox fields. Using Javascript, I would like to make sure only one checkbox can be ticked. (e.g if one checkbox1 is ticked, if checkbox2 is ticked, checkbox1 w

Answer 1

Also based on tymeJV's answer above, if you want to only deactivate the other checkbox when one is clicked you can do this:

function cbChange(obj) {
var instate=(obj.checked);
    var cbs = document.getElementsByClassName("cb");
    for (var i = 0; i < cbs.length; i++) {
        cbs[i].checked = false;
    }
    if(instate)obj.checked = true;
}

tymeJV's function does not let you have both unticked - this does. (yes, weird but true.. sometimes there's a semantic reason why you want two tickboxes not radio buttons)