Question

I’m trying to implement touch evens with jGestures. swipeone works fine but anything else (swipeleft, swiperight etc) is not firing.

<div id="wrap" style="height:500px; width:500px; background: blue;">

    </div>
    <script type="text/javascript">
        $('#wrap').bind('swipeleft', function(){
            alert("test");
        });
    </script>

This is just a test page I did. It was actually working at one point in my main project but seemed to have stopped for no reason at all, not even when I reverted to an older version. I’ve tried a different version of jGestures with no luck.

Answer 1

SwipeLeft, SwipeRight, -Up and -Down are kind of poorly implemented. They are only triggered if you stay EXACTLY on the axis where you started the touch event.
For example, SwipeRight will only work if your finger moves from (X,Y) (120, 0) to (250, 0).

If the Y-Coordinates from Start- and Endpoint differ, it’s not gonna work.

jGestures.js (ca. line 1095) should better look something like this (readable):

/**
 * U Up, LU LeftUp, RU RightUp, etc.
 * 
 *  \U|U/
 * LU\|/RU
 *L---+---R
 * LD/|\RD
 *  /D|D\
 *
 */
if ( _bHasTouches && _bHasMoved === true && _bHasSwipeGesture===true) {
    _bIsSwipe = true;
    var deltaX = _oDetails.delta[0].lastX;
    var deltaY = _oDetails.delta[0].lastY;
    var hor = ver = '';
    if (deltaX > 0) { // right
        hor = 'right';
        if (deltaY > 0) {
            ver = 'down'
        } else {
            ver = 'up';
        }

        if (Math.abs(deltaY) < deltaX * 0.3) {
            ver = '';
        } else if (Math.abs(deltaY) >= deltaX * 2.2) {
            hor = '';
        }
    } else { // left
        hor = 'left';
        if (deltaY > 0) {
            ver = 'down'
        } else {
            ver = 'up';
        }

        if (Math.abs(deltaY) < Math.abs(deltaX) * 0.3) {
            ver = '';
        } else if (Math.abs(deltaY) > Math.abs(deltaX) * 2.2) {
            hor = '';
        }
    }
    // (_oDetails.delta[0].lastX < 0) -> 'left'
    // (_oDetails.delta[0].lastY > 0) -> 'down'
    // (_oDetails.delta[0].lastY < 0) -> 'up'
    // alert('function swipe_' + hor + '_' + ver);

    _oDetails.type = ['swipe', hor, ver].join('');
    _$element.triggerHandler(_oDetails.type, _oDetails);
}