Fire alerts during gesture instead of after gesture

JavaScript
1

I am trying to get these alerts to fire during the gesture, not after the gesture ends. So during the pinch gesture, which transforms the element it is taking place over, while the scale, of the element, is 0.5 or less or while the scale is bigger than 1.0.

I am using Hammer.js to listen for the gestures: http://eightmedia.github.io/hammer.js/

Here is my code so far:

 var hammertime = Hammer(document.body, {
           transform_always_block: true,
           transform_min_scale: 0,
           drag_block_horizontal: true,
           drag_block_vertical: true,
           drag_min_distance: 0
    });
 
    var posX = 0,
        posY = 0,
        lastPosX = 0,
        lastPosY = 0,
        bufferX = 0,
        bufferY = 0,
        scale = 1,
        last_scale,
        rotation = 1,
        last_rotation,
        dragReady = 0;

    hammertime.on('touch drag dragend transform transformend', function(ev) {
    
        if ((" " + ev.target.className + " ").indexOf(" dataCard ") < 0) return;
        else manageMultitouch(ev, ev.target);

    });

    function manageMultitouch(ev, element) {

         switch (ev.type) { 
            case 'touch': last_scale = scale;
                    last_rotation = rotation;
                    return;
            case 'dragend':
                    lastPosX = posX; 
                    lastPosY = posY; 
                    return; 
            case 'drag':
                   posX = ev.gesture.deltaX + lastPosX;
                   posY = ev.gesture.deltaY + lastPosY; 
                   break; 
            case 'transform':
                   rotation = last_rotation + ev.gesture.rotation;
                   scale = Math.min(last_scale * ev.gesture.scale, 10);
                   break;
         }
 
         if(scale <= 0.5) alert("scale is less than or equal to 0.5");

         if(scale > 1.0 ) alert("scale is bigger than 1.0");
 
         var transform = "translate(" + 0 + "px," + 0 + "px) " + "scale(" + 0 + "," + scale + ")"; 
         var style = element.style;
         style.transform = transform;
         style.oTransform = transform;
         style.msTransform = transform;
         style.mozTransform = transform;
         style.webkitTransform = transform;
      }