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问题:

I have the following jQuery code

$(document).ready(function () {
    $('.navtoTop').click(function(){
           $("html").scrollTop( $("#topofthePage").offset().top );
    }); 
});

where 'navtoTop' is the class of the button(something like 'Back to top') which has the fixed position in the bottom-left of the page and 'topofthePage' is the id of the <div> at the most top of my page.

I have even tried this

$('.navtoTop').click(function(){
    $('html, body').animate({scrollTop : 0},800);
    return false;
});

Here is the html code

<body>
    <div id="topofthePage"></div>
    ...
    ...
    <img src="navtoTop.png" class="navtoTop">   
</body>

I don't know what is going wrong but this is not working. Will someone explain and give a good solution?

Ask me the detail of code if you want.

回答1:

You have to use window instead of html:

$(window).scrollTop( $("#topofthePage").offset().top );

Note that window should not be enclosed in quotes as i'ts an object and not a tag.

回答2:

A common scrollTo issue is having overflow set on the "html, body" element in css. Rarely mentioned when having scrolling/animating issues on html/body elements and can end up in excessive over-engineering.

If overflow needs to be set, put it on the body element only. Not both html,body.

It is also a good habit to use a data-* attribute in place of classes or IDs in your html. This gets you in the habit of separating styles from code. Consider this to make your life easier in the future:

Create Reusable Scroll Function

scrollioreceiver = function(sender) {

  $(sender).on({
    click: sentFrom
  });

  function sentFrom(){
    var dataMine = $(this).attr('data-sender'),
        dataSend = $('[data-receiver="'+dataMine+'"]');

    $('html, body').animate({
        scrollTop: $(dataSend).offset().top - 70
    }, 800, function() {
        // if you need a callback function
    });
  }
}

Create data attributes to html elements (data-name is arbitrary and should make sense):

ADD HTML LINK

<a data-sender="ScrollToMatch">Link To Click To Scroll To Match Attribute</a>

ADD HTML ELEMENT

<div data-receiver="ScrollToMatch">Scrolls To This Element</div>

VERIFY CSS » overflow added to "html,body" won't work

body { overflow-x: hidden; }

INIT FUNCTION ON READY » initialize on doc ready with attribute name selector to create flexibility on multiple calls

scrollioreceiver('[data-sender]');

Hope this helps!

回答3:

You already got an answer on this. But, since you also want a smooth scrolling, consider the following alternative:

$('.navtoTop').click(function(){
    $('html, body').animate({
        scrollTop: $('#topofthePage').offset().top
    }, 1000);
});

回答4:

Better way to use:

$(document).ready(function () {
    $('.navtoTop').click(function(){
          $(window).scrollTop()
          $("window").scrollTop( $("#topofthePage").offset().top );
    }); 
});