如何区分手动滚动（通过鼠标滚轮/滚动条）和Javascript/jQuery滚动？

Question

如何区分手动滚动（通过鼠标滚轮/滚动条）和Javascript/jQuery滚动？

javascriptjqueryscrollscrollbarmousewheel

26

更新:

这里是一个jsbin示例，演示了问题。

更新2:
这是修复版本，感谢fudgey。

基本上，我有以下的javascript代码，它可以将窗口滚动到页面的锚点处：

 // get anchors with href's that start with "#"
 $("a[href^=#]").live("click", function(){
     var target = $($(this).attr("href"));
     // if the target exists: scroll to it...
     if(target[0]){
         // If the page isn't long enough to scroll to the target's position
         // we want to scroll as much as we can. This part prevents a sudden 
         // stop when window.scrollTop reaches its maximum.
         var y = Math.min(target.offset().top, $(document).height() - $(window).height());
         // also, don't try to scroll to a negative value...
         y=Math.max(y,0);
         // OK, you can scroll now...
         $("html,body").stop().animate({ "scrollTop": y }, 1000);
     }
     return false;
 });

它完美地运作...直到我手动尝试滚动窗口。当滚动条或鼠标滚轮滚动时，我需要停止当前的滚动动画...但我不确定如何做到这一点。

这可能是我的起点...

$(window).scroll(e){
    if(IsManuallyScrolled(e)){
        $("html,body").stop();
    }
}

我不确定如何编写IsManuallyScrolled函数。我已经在Google Chrome的控制台中查看了e（即事件对象），据我所知，没有办法区分手动滚动和由jQuery的animate()滚动调用之间的区别。

如何区分通过jQuery的$.fn.animate函数调用的滚动和手动滚动？

- David Murdoch

3个回答

2

我几天前遇到了你同样的问题。如果你想获得那个结果，就不应该使用jquery的animate函数，而是要使用轮询函数来模拟动画效果。

我写了这个类，当调用ScrollDown.slow()时，它可以提供平滑的向下滚动。

ScrollDown.current=$(window).scrollTop();
ScrollDown.lastValue;
ScrollDown.lastType;
ScrollDown.enabled=true;
ScrollDown.custom=function(value,rate){  //let's say value==='bottom' and rate=10
    if(value==='bottom'){
        value=$(document).height()-$(window).height();
    }
    ScrollDown.current=$(window).scrollTop();
    ScrollDown.lastValue=value;
    (function poll(){
        setTimeout(function(){
            var prev=$(window).scrollTop();  //This is the critical part
            /*I'm saving again the scroll position of the window, remember
            10 ms have passed since the polling has started
            At this rate, if the user will scroll up for down pre!==ScrollDown.current
            And that means I have to stop scrolling.*/
            ScrollDown.current++; //increasing the scroll variable so that it keeps scrolling
            $(window).scrollTop(ScrollDown.current);
            if(ScrollDown.current<ScrollDown.lastValue && ScrollDown.enabled){  
            //ScrollDown.current<ScrollDown.lastValue basically checks if it's reached the bottom
                if(prev!==ScrollDown.current-1){
                /*I'm checking if the user 
                scrolled up or down while the polling has been going on, 
                if the user scrolls up then prev<ScrollDown.current-1, 
                if the user scrolls down then prev>ScrollDown.current-1 
                and at the next poll() the scrolling will stop 
                because ScrollDown.enabled will bet set to false by ScrollDown.stop()*/
                    ScrollDown.stop();
                }
                poll();
            }
        },rate);
    })();
};

ScrollDown.stop=function(){
    ScrollDown.enabled=false;
};

ScrollDown.continue=function(){
    ScrollDown.enabled=true;
    switch (ScrollDown.lastType){
        case "fast":
            ScrollDown.fast(ScrollDown.lastValue);
            break;
        case "normal":
            ScrollDown.normal(ScrollDown.lastValue);
            break;
        case "slow":
            ScrollDown.slow(ScrollDown.lastValue);
            break;
    }
};

ScrollDown.fast=function(value){
    if(!ScrollDown.enabled){
        ScrollDown.continue();
    }else{
        ScrollDown.lastType='fast';
        ScrollDown.custom(value,1);
    }
};
ScrollDown.normal=function(value){
    if(!ScrollDown.enabled){
        ScrollDown.continue();
    }else{
        ScrollDown.lastType='normal';
        ScrollDown.custom(value,10);
    }
};
ScrollDown.slow=function(value){
    if(!ScrollDown.enabled){
        ScrollDown.continue();
    }else{
        ScrollDown.lastType='slow';
        ScrollDown.custom(value,50);
    }
};
function ScrollDown(){}

如果你调用 ScrollDown.slow('bottom')，它会缓慢滚动直到页面底部，除非你手动向上或向下滚动，否则它会停止。

- Razvan Tanase

-1

你可以设置一个变量来指示你对动画的调用是活动的，然后在滚动处理程序内检查该变量。

window.IsAutoScrolling = true;
$("html,body").stop().animate({ "scrollTop": y }, 1000);
// Do something to set IsAutoScrolling = false, when the animation is done.

$(window).scroll(e){  
if(!window.IsAutoScrolling){  
    $("html,body").stop();  
}

- John Fisher

这样做不起作用，因为直到滚动停止，window.IsAutoScrolling将始终为true...此时我们不再关心窗口是否自动滚动。问题在于检测是谁在调用滚动DURING动画滚动；jQuery还是用户。 - David Murdoch

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- Mottie · Accepted Answer

试试这个函数：

$('body,html').bind('scroll mousedown wheel DOMMouseScroll mousewheel keyup', function(e){
 if ( e.which > 0 || e.type == "mousedown" || e.type == "mousewheel"){
  $("html,body").stop();
 }
})

另外，你看过这个教程吗？

更新：现代浏览器现在使用“wheel”作为事件，所以我已经在上面的代码中包含了它。