javascript - 使用鼠标和触摸水平滚动 div

Question

假设我有一个 white-space: nowrap; 带有 overflow: hidden; 的 div。它的内容当然比 div 长得多，需要滚动才能显示出来。

我正在使用 this库，但它不适用于具有触摸输入的移动设备。您知道实现此功能的任何替代方法或方法吗？

Answer 1

我的愿望终于实现了。这里我修改了 dragscroll.js 库以启用触摸支持。

/* Modified dragscroll.js by Undust4able */

(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        define(['exports'], factory);
    } else if (typeof exports !== 'undefined') {
        factory(exports);
    } else {
        factory((root.dragscroll = {}));
    }
}(this, function (exports) {
    var _window = window;
    var _document = document;
	
    var mousemove = 'mousemove';
    var mouseup = 'mouseup';
    var mousedown = 'mousedown';
	
	var touchmove = 'touchmove';
    var touchup = 'touchend';
    var touchdown = 'touchstart';
	
    var EventListener = 'EventListener';
    var addEventListener = 'add'+EventListener;
    var removeEventListener = 'remove'+EventListener;

    var dragged = [];
    var reset = function(i, el) {
        for (i = 0; i < dragged.length;) {
            el = dragged[i++];
            el = el.container || el;
            el[removeEventListener](mousedown, el.md, 0);
            _window[removeEventListener](mouseup, el.mu, 0);
            _window[removeEventListener](mousemove, el.mm, 0);
			
			 el[removeEventListener](touchdown, el.td, 0);
            _window[removeEventListener](touchup, el.tu, 0);
            _window[removeEventListener](touchmove, el.tm, 0);
        }

        // cloning into array since HTMLCollection is updated dynamically
        dragged = [].slice.call(_document.getElementsByClassName('dragscroll'));
        for (i = 0; i < dragged.length;) {
            (function(el, lastClientX, lastClientY, pushed, scroller, cont){
                (cont = el.container || el)[addEventListener](
                    mousedown,
                    cont.md = function(e) {
                        if (!el.hasAttribute('nochilddrag') ||
                            _document.elementFromPoint(
                                e.pageX, e.pageY
                            ) == cont
                        ) {
                            pushed = 1;
                            lastClientX = e.clientX;
                            lastClientY = e.clientY;

                            e.preventDefault();
                        }
                    }, 0
                );
				(cont = el.container || el)[addEventListener](
                    touchdown,
                    cont.td = function(e) {
                        if (!el.hasAttribute('nochilddrag') ||
                            _document.elementFromPoint(
                                e.pageX, e.pageY
                            ) == cont
                        ) {
                            pushed = 1;
                            e.preventDefault();

							e = e.targetTouches[0];
                            lastClientX = e.clientX;
                            lastClientY = e.clientY;
                            
                        }
                    }, 0
                );
                _window[addEventListener](
                    mouseup, cont.mu = function() {pushed = 0;}, 0
                );
				_window[addEventListener](
                    touchup, cont.tu = function() {pushed = 0;}, 0
                );
                _window[addEventListener](
                    mousemove,
                    cont.mm = function(e) {
                        if (pushed) {
                             (scroller = el.scroller||el).scrollLeft -=
                                 (- lastClientX + (lastClientX=e.clientX));
                             scroller.scrollTop -=
                                 (- lastClientY + (lastClientY=e.clientY));
                        }
                    }, 0
                );
				_window[addEventListener](
                    touchmove,
                    cont.tm = function(e) {
                        if (pushed) {
							e = e.targetTouches[0];
                             (scroller = el.scroller||el).scrollLeft -=
                                 (- lastClientX + (lastClientX=e.clientX));
                             scroller.scrollTop -=
                                 (- lastClientY + (lastClientY=e.clientY));
                        }
						
                    }, 0
                );
             })(dragged[i++]);
        }
    }

      
    if (_document.readyState == 'complete') {
        reset();
    } else {
        _window[addEventListener]('load', reset, 0);
    }

    exports.reset = reset;
}));