jQuery cross-browser “scroll to top”, with animati

问题:

Right now I'm using this:

$('#go-to-top').each(function(){
  $(this).click(function(){ 
    $('html').animate({ scrollTop: 0 }, 'slow'); return true; 
  });
});

which doesn't work in Chrome, and in Opera I get a small flicker: the browser instantly scrolls to the top, then back to the bottom and then it begins to scroll slowly back to top, like it should.

Is there a better way to do this?

回答1:

You're returning true from the click function, so it won't prevent the default browser behaviour (i.e. navigating to thego-to-top anchor. As Mark has said, use:

$('html,body').animate({ scrollTop: 0 }, 'slow');

So your code should now look like:

$('#go-to-top').each(function(){
    $(this).click(function(){ 
        $('html,body').animate({ scrollTop: 0 }, 'slow');
        return false; 
    });
});

回答2:

To get it to work in opera this answer proved helpful.

Putting that with your click()

$(this).click(function() {
    $(window.opera ? 'html' : 'html, body').animate({
        scrollTop: 0
    }, 'slow');
});

Code example on jsfiddle.

Side note if all you are doing with the .each() is assigning a click handler you do not need to iterate over the collection it can be simplified to this:

$('#go-to-top').click(function(){ 
    $(window.opera ? 'html' : 'html, body').animate({
        scrollTop: 0
        }, 'slow');
});

Also if there is more than one element with id #go-to-top your markup will be invalid, try switching it to a class .go-to-top

回答3:

maybe something like

$('body').animate({scrollTop:0}, 'slow');

aswell as the html one.

edit >

$('#go-to-top').each(function(){
  $(this).click(function(){ 
    $('html').animate({ scrollTop: 0 }, 'slow'); return true; 
    $('body').animate({ scrollTop: 0 }, 'slow'); return true; 
    $('document').animate({ scrollTop: 0 }, 'slow'); return true; 
    $('window').animate({ scrollTop: 0 }, 'slow'); return true; 
  });
});

should cover all browsers!

回答4:

Hm... strange, with jsFiddle I can get it to work fine in Opera (ver 11.01), but in Chrome it just jumps up to the top and doesn't animate it like you want to.

You can se the jsFiddle here if you want to: http://jsfiddle.net/H7RFU/

I hope that helps a bit, though it's not really an answer.

If what I have made isn't what your html etc looks like, please update it and add it.

Best regards,

Christian

Caveat: I haven't used the save function of jsFiddle before so I dunno for how long it it saved.

回答5:

$(window).animate({ scrollTop: 0 }, 'slow');

It works cross-browser

回答6:

This will be working in all browsers. It avoids the hash tag on the url, so, the smooth scroll is done!

 $('#back-top a[href*=#]:not([href=#])').click(function() {
    if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {

      var target = $(this.hash);
      target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
      if (target.length) {

        $('html,body').animate({

          scrollTop: target.offset().top
        }, 1000);
        return false;
      }
    }
  }); 

回答7:

I am using this, This is also simple

$(document).ready(function(e) {
var a = 400,
t = 1200,
l = 700,
s = e(".scrool-top");
e(window).scroll(function() {
e(this).scrollTop() > a ? s.addClass("scrool-is-visible") : s.removeClass("scrool-is-visible scrool-fade-out"), e(this).scrollTop() > t && s.addClass("scrool-fade-out")
}), s.on("click", function(a) {
a.preventDefault(), e("body,html").animate({
scrollTop: 0
}, l)
})
})

回答8:

I have a smooth solution in two ways: smooth scrolling and a smooth button.

With JavaScript disabled, it´s just a link on the bottom of the page to the anchor top.
(# as href can be pretty unstable.)

With JavaScript enabled:

1. Hide the div containing the link (to avoid flickering).
2. Fix the position of the div at the bottom right border of the window.
3. Remove the href attribute and add click handler for smooth scrolling. (keeps URL and browser history tidy and I need no return or preventDefault in the scrolling function)
4. Fade div in / out depending on scroll position:
   Display link only if scroll position > window height.
5. Update the position on resize.

HTML

<body>
    <a name="top"></a>
    ...
    <div id="scrolltotop" style="display:block;text-align:right">
        <a href="#top" title="scroll to top"><img src="scrolltotop.png" alt="scroll to top"></a>
    </div>
</body>

jQuery

function scrolltotop_display()
{
    var el=$('#scrolltotop');
    if((window.pageYOffset||document.documentElement.scrollTop)>window.innerHeight)
    { if(!el.is(':visible')) { el.stop(true, true).fadeIn(); } }
    else { if(!el.is(':animated')) { el.stop(true, true).fadeOut(); }}
}
function scrolltotop_position()
{
    var el=$('#scrolltotop');
    el.css('top', window.innerHeight-100);
    el.css('left', window.innerWidth-100);
    scrolltotop_display();
}
$(window).on('load', function(){
    $('#scrolltotop').css('display', 'none');
    $('#scrollToTop').css('position', 'fixed');
    scrolltotop_position();
    $('#scrollToTop a').removeAttr('href');
    $('#scrollToTop a').on('click', function(){$('html, body').animate({scrollTop:0}, 500);});
});
$(window).on('scroll', scrolltotop_display);
$(window).on('resize', scrolltotop_position);