How can I shift-select multiple checkboxes like GMail?

Question

In GMail, the user can click on one checkbox in the email list, hold down the Shift key, and select a second checkbox. The JavaScript will then select/unselect the checkboxe

Answer 1

Got this solution from http://abcoder.com/javascript/jquery/simple-check-uncheck-all-jquery-function/ (now dead):

JavaScript and HTML code

var NUM_BOXES = 10;

// last checkbox the user clicked
var last = -1;

function check(event) {
  // in IE, the event object is a property of the window object
  // in Mozilla, event object is passed to event handlers as a parameter
  if (!event) { event = window.event }
  var num = parseInt(/box\[(\d+)\]/.exec(this.name)[1]);
  if (event.shiftKey && last != -1) {
     var di = num > last ? 1 : -1;
     for (var i = last; i != num; i += di) {
        document.forms.boxes['box[' + i + ']'].checked = true;
     }
  }
  last = num;
}

function init() {
  for (var i = 0; i < NUM_BOXES; i++) {
    document.forms.boxes['box[' + i + ']'].onclick = check;
  }
}