问题描述

我在触摸滑块上弄乱了触摸事件，并且不断收到以下错误:

I'm messing around with touch events on a touch slider and I keep getting the following error:

使用cancelable=false 忽略取消touchmove 事件的尝试，例如，因为滚动正在进行中并且不能被打断了.

Ignored attempt to cancel a touchmove event with cancelable=false, for example because scrolling is in progress and cannot be interrupted.

我不确定是什么导致了这个问题，我刚接触触摸事件，似乎无法解决这个问题.

I'm not sure what is causing this problem, I am new to working with touch events and can't seem to fix this problem.

这里是处理触摸事件的代码:

Here is the code handling the touch event:

Slider.prototype.isSwipe = function(threshold) {
    return Math.abs(deltaX) > Math.max(threshold, Math.abs(deltaY));
}


Slider.prototype.touchStart = function(e) {

    if (this._isSliding) return false;

      touchMoving = true;
      deltaX = deltaY = 0;

    if (e.originalEvent.touches.length === 1) {

        startX = e.originalEvent.touches[0].pageX;
        startY = e.originalEvent.touches[0].pageY;

        this._$slider.on('touchmove touchcancel', this.touchMove.bind(this)).one('touchend', this.touchEnd.bind(this));

        isFlick = true;

        window.setTimeout(function() {
            isFlick = false;
        }, flickTimeout);
    }
}


Slider.prototype.touchMove = function(e) {

    deltaX = startX - e.originalEvent.touches[0].pageX;
    deltaY = startY - e.originalEvent.touches[0].pageY;

    if(this.isSwipe(swipeThreshold)) {
        e.preventDefault();
        e.stopPropagation();
        swiping = true;
    }
    if(swiping) {
        this.slide(deltaX / this._sliderWidth, true)
    }
}


Slider.prototype.touchEnd = function(e) {

    var threshold = isFlick ? swipeThreshold : this._sliderWidth / 2;

    if (this.isSwipe(threshold)) {
        deltaX < 0 ? this.prev() : this.next();
    }
    else {
        this.slide(0, !deltaX);
    }

    swiping = false;

    this._$slider.off('touchmove', this.touchMove).one(transitionend, $.proxy(function() {
        this.slide(0, true);
        touchMoving = false;
    }, this));
}

您可以在在这支笔上找到实际的滑块.

You can find the actual slider here at this pen.

如果你刷得足够快，它会抛出错误，有时会卡在刷卡的中间.仍然无法理解为什么它不起作用.任何帮助/见解将不胜感激.不知道我做错了什么.

If you swipe through fast enough it will throw the error and sometimes get stuck in the middle of a swipe. Still can't wrap my head around why it is not working. Any help/insight would be greatly appreciated. Not sure what I am doing wrong.

推荐答案

事件必须是cancelable.添加 if 语句可解决此问题.

The event must be cancelable. Adding an if statement solves this issue.

if (e.cancelable) {
   e.preventDefault();
}

在你的代码中你应该把它放在这里:

In your code you should put it here:

if (this.isSwipe(swipeThreshold) && e.cancelable) {
   e.preventDefault();
   e.stopPropagation();
   swiping = true;
}

这篇关于触摸移动卡住 忽略取消触摸移动的尝试的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！