Swiper: Touch drag no longer works (possible bug)

[ksn-systems]

Hi

Using version 5.3.8 with a simple scroller of a few slides and the cube effect, I can successfully manually change slides as expected by dragging on a touch screen (A HP PC). If I update to 5.4.0 or 5.4.1 whilst I can still trigger a transition via the API, when I drag the swioer, it moves a very small amount and "sticks".

(I set direction, effect and speed from vars)

 swipers[data.block_id] = new Swiper ('#' + data.block_id + ' > .swiper-container', {
    // Optional parameters
    direction: direction,
    'effect' : effect,
    'speed' : speed,
    //'roundLengths' : true,
    pagination: {
        el: '.swiper-pagination_' + data.block_id,
    },
    coverflowEffect: {
        rotate: 60,
        slideShadows: false
    },
    flipEffect: {
        rotate: 30,
        slideShadows: false
    },
    cubeEffect: {
        slideShadows: false,
        shadow: showShadow
    },
    loop: true,
});

[bariscc]

Can confirm, touch drag is not working on demos.

Windows 10
Chrome Version 83.0.4103.97
Edge Version 83.0.478.45
No issues on Firefox

[kebien6020]

Also can confirm, not working on demos.

Windows 10
Chrome Version 83.0.4103.116
In Firefox 78.0.1 having trouble with vertical swiping. Horizontal works fine.

CSS scrolling demo works fine for both.

[antonioberetini]

Same here

[jorovipe97]

Same here, it works on chrome android but not on windows.

[jwoodwardtfx]

I think it's to do with the change "Simplify touch events detection" (https://github.com/nolimits4web/swiper/commit/11dcfe55bd5bcee62fc1c89da37ca4a607c80b0f)

It looks like there has been an attempt to simplify detection of "touch" support, however the way it's been changed will break most desktop/tablet use cases.

The newer code uses either:

• 'ontouchstart' in window => this has been deprecated and taken out of Chrome for ages (https://www.chromestatus.com/feature/4764225348042752)
• DocumentTouch => this has been removed from the standards and shouldn't be used either (https://developer.mozilla.org/en-US/docs/Web/API/DocumentTouch)

The old method checks for "window.navigator.maxTouchPoints", which (at least on Windows desktop/tablets) will function correctly.

This commit needs reverting.

[jwoodwardtfx]

Any update on this? It's a fairly serious bug.

[vltansky]

Duplicate of #3728