动画scrollTop不工作在Firefox [英] Animate scrollTop not working in firefox
问题描述
这个函数工作正常。它将主体滚动到所需容器的偏移位置。
函数scrolear(destino){
var stop = $(destino) .offset()顶部。
var delay = 1000;
$('body')。animate({scrollTop:stop},delay);
返回false;
}
但是不能在Firefox中使用。为什么?
-EDIT -
为了处理接受的答案中的双重触发器,我建议停止元素在动画之前:
$('body,html')。stop(true,true).animate({scrollTop:stop延迟);
要在Firefox中使用,请使用
$('body,html')。animate(...);
CSS解决方案将设置以下样式:
html {overflow:hidden;身高:100% }
body {overflow:auto;身高:100% }
我会假定JS解决方案的侵入性最小。
更新
事实上,动画两个元素的 scrollTop
会导致回调被调用两次。浏览器检测功能已被建议,随后被弃用,有些可能是相当牵强的。
如果回调是幂等的,并且不需要大量的计算能力,发射两次可能是完全没有问题的。如果回调的多个调用确实是一个问题,并且如果您想要避免功能检测,则可以更直接地强制回调仅在回调中运行一次:
函数runOnce(fn){
var count = 0;
return function(){
if(++ count == 1)
fn.apply(this,arguments);
};
};
$ b $('body,html')。animate({scrollTop:stop},delay,runOnce(function(){
console.log('scroll complete');
}));
This function works fine. It scrolls the body to a desired container's offset
function scrolear(destino){
var stop = $(destino).offset().top;
var delay = 1000;
$('body').animate({scrollTop: stop}, delay);
return false;
}
But not in Firefox. Why?
-EDIT-
To handle de double trigger in the accepted answer, I suggest stoping the element before the animation:
$('body,html').stop(true,true).animate({scrollTop: stop}, delay);
Firefox places the overflow at the html
level, unless specifically styled to behave differently.
To get it to work in Firefox, use
$('body,html').animate( ... );
The CSS solution would be to set the following styles:
html { overflow: hidden; height: 100%; }
body { overflow: auto; height: 100%; }
I would assume that the JS solution would be least invasive.
Update
A lot of the discussion below focuses on the fact that animating the scrollTop
of two elements would cause the callback to be invoked twice. Browser-detection features have been suggested and subsequently deprecated, and some are arguably rather far-fetched.
If the callback is idempotent and doesn't require a lot of computing power, firing it twice may be a complete non-issue. If multiple invocations of the callback are truly an issue, and if you want to avoid feature-detection, it might be more straight-forward to enforce that the callback is only run once from within the callback:
function runOnce(fn) {
var count = 0;
return function() {
if(++count == 1)
fn.apply(this, arguments);
};
};
$('body, html').animate({ scrollTop: stop }, delay, runOnce(function() {
console.log('scroll complete');
}));
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