自动滚动到鼠标滚轮上的下一个锚点 [英] Auto-Scroll to next anchor at Mouse-wheel
问题描述
这适用于Chrome,IE,Firefox,Opera和Safari。 b
$ b
(function(){
var delay = false;
$(document).on('mousewheel DOMMouseScroll',function(event){
event.preventDefault();
if(delay)return;
delay = true;
setTimeout(function(){ delay = false},200)
var wd = event.originalEvent.wheelDelta || -event.originalEvent.detail;
var a = document.getElementsByTagName('a' );
if(wd <0){
for(var i = 0; i var t = a [i] .getClientRects() [0] .top;
if(t> = 40)break;
}
}
else {
for(var i = a.length-1 ; i> = 0; i--){
var t = a [i] .getClientRects()[0] .top;
if(t <-20)break; $ b $如果(i> = 0&< i< a.length){
$(b> b)
} HTML,身体)动画({
scrollTop的:A [1] .offsetTop
});
}
});
})();
小提琴 http://jsfiddle.net/t6LLybx8/728/
工作原理
要在大多数浏览器中监视鼠标滚轮,请使用 $(document).on('mousewheel')
。 Firefox是古怪的,它需要 $(document).on('DOMMouseScroll')
。
鼠标滚轮的方向(向上或向下),使用 event.originalEvent.wheelDelta
。同样,Firefox是古怪的,你必须使用 -event.originalEvent.detail
。
是负数,您正在向页面滚动向下。在这种情况下,循环遍历每个以 first 开始的标记,直到它的第一个 getClientRects()
top>> 40.(我用了40,以防止浏览器在视口顶部添加默认边距。)
如果方向是正数,则您正在滚动向上 >页面。在这种情况下,循环遍历每个以 last 开始的标记,直到其第一个 getClientRects()
top为< -20。 (我使用了-20来确保我们向上移动页面。)
$ b $ <
delay
仍然是一个私有变量。 I have 5 anchors on my html page. Is there any way that the page scrolls automatically to the next anchor (#) by a single Mouse-wheel scroll? Is there a way that it happens regardless of the anchor's name? just to the next anchor.
This works in Chrome, IE, Firefox, Opera, and Safari:
(function() {
var delay = false;
$(document).on('mousewheel DOMMouseScroll', function(event) {
event.preventDefault();
if(delay) return;
delay = true;
setTimeout(function(){delay = false},200)
var wd = event.originalEvent.wheelDelta || -event.originalEvent.detail;
var a= document.getElementsByTagName('a');
if(wd < 0) {
for(var i = 0 ; i < a.length ; i++) {
var t = a[i].getClientRects()[0].top;
if(t >= 40) break;
}
}
else {
for(var i = a.length-1 ; i >= 0 ; i--) {
var t = a[i].getClientRects()[0].top;
if(t < -20) break;
}
}
if(i >= 0 && i < a.length) {
$('html,body').animate({
scrollTop: a[i].offsetTop
});
}
});
})();
Fiddle at http://jsfiddle.net/t6LLybx8/728/
How it works
To monitor the mouse wheel in most browsers, use $(document).on('mousewheel')
. Firefox is the oddball, and it requires $(document).on('DOMMouseScroll')
.
To get the direction of the mouse wheel (up or down), use event.originalEvent.wheelDelta
. Again, Firefox is the oddball, and you have to use -event.originalEvent.detail
.
If the direction is a negative number, you're scrolling down the page. In that case, loop through each tag beginning with the first, until its first getClientRects()
top is >= 40. (I used 40, in case the browser adds a default margin at the top of the viewport.)
If the direction is a positive number, you're scrolling up the page. In that case, loop through each tag beginning with the last, until its first getClientRects()
top is < -20. (I used -20 to ensure we move up the page.)
The delay
variable prevents the mouse wheel from scrolling too quickly. The entire function is wrapped in a closure, so delay
remains a private variable.
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