从页面底部固定侧边栏滚动290px?

时间:2014-03-21 02:24:11

标签: javascript jquery css wordpress sidebar

我正在尝试创建一个类似于Vice.com上的侧边栏的侧边栏。如果向下滚动,侧边栏将固定在某个点,然后当侧边栏到达站点底部附近的某个点时,它将继续向上滚动到站点的其余部分。

在我的网站上,我被困在第二部分,一旦它碰到底部附近,侧边栏就会继续向上滚动。确切地说,从底部290px

这是我到目前为止所做的:

的JavaScript

<script>
jQuery(window).scroll(function () {
    var threshold = 20;
 if (jQuery(window).scrollTop() >= 20)
     jQuery('#sidebar').addClass('fixed');
 else
     jQuery('#sidebar').removeClass('fixed');
});
</script>

CSS

#sidebar {
  margin: 0;
  position: absolute;
  right: 0;
  width: 220px;
}
#sidebar.fixed {
  margin-left: 720px;
  position:fixed;
  right: auto;
  top: 173px;
}

如果固定侧边栏在触及底部附近的某个点时向上滚动,该怎么办?


编辑#1

以下是Adam的更新代码。我正在为具有不同阈值的页面使用条件语句。当我使用这个代码时没有任何反应,这意味着侧边栏没有添加fixed类,因此正常向上滚动,好像代码甚至没有。另外,我在这一行if (scrollTop() >= 236) {上收到一个控制台错误,说“数字不是函数”。

if (jQuery(document.body).hasClass("home")) {

    jQuery(window).scroll(function () {
        var sidebarHeight = jQuery('#sidebar').height(),
            containerHeight = jQuery('#container').height() + 173,
            scrollTop = jQuery(window).scrollTop(),
            clientHeight = scrollTop + jQuery(window).height(),
            threshold = 654;
        if (scrollTop() >= 654) {
            jQuery('#sidebar').addClass('fixed');
        } else if (containerHeight - scrollTop <= sidebarHeight) {
            jQuery('#sidebar').removeClass('fixed').addClass('bottom');
        }
    });

} else if (jQuery(document.body).hasClass("single") || jQuery(document.body).hasClass("page")) {

    jQuery(window).scroll(function () {
        var sidebarHeight = jQuery('#sidebar').height(),
            containerHeight = jQuery('#container').height() + 173,
            scrollTop = jQuery(window).scrollTop(),
            clientHeight = scrollTop + jQuery(window).height(),
            threshold = 20;
        if (scrollTop() >= 20) {
            jQuery('#sidebar').addClass('fixed');
        } else if (containerHeight - scrollTop <= sidebarHeight) {
            jQuery('#sidebar').removeClass('fixed').addClass('bottom');
        }
    });

} else {

    jQuery(window).scroll(function () {
        var sidebarHeight = jQuery('#sidebar').height(),
            containerHeight = jQuery('#container').height() + 173,
            scrollTop = jQuery(window).scrollTop(),
            clientHeight = scrollTop + jQuery(window).height(),
            threshold = 236;
        if (scrollTop() >= 236) {
            jQuery('#sidebar').addClass('fixed');
        } else if (containerHeight - scrollTop <= sidebarHeight) {
            jQuery('#sidebar').removeClass('fixed').addClass('bottom');
        }
    });

}

以下是所请求的HTML结构:

<!-- BEGIN #masthead-->
<div id="masthead">
    <!-- #secondary-menu -->
    <div id="secondary-menu">

        <!-- .centered-menu -->
        <div class="centered-menu">
            <div class="latest-tweets"></div>
            <div id="search-bar"></div>
            <ul class="social-icons sf-js-enabled"></ul>
        </div>
        <!-- /.centered-menu -->

    </div>
    <!-- /#secondary-menu -->

    <!-- BEGIN #header-->
    <div id="header">

        <!-- #header-inner -->
        <div id="header-inner" class="clearfix">
            <div id="logo"></div>

            <!-- BEGIN #primary-menu -->
            <div id="primary-menu" class="clearfix">

                <!-- .left-menu -->
                <div class="left-menu split-menu"></div>
                <!-- /.left-menu -->

                <!-- .right-menu -->
                <div class="right-menu split-menu">
                    <div class="menu-menu-right-container"></div>
                <!-- /.right-menu -->   

            <!-- END #primary-menu -->
            </div>

        </div>
        <!-- /#header-inner -->

    <!-- END #header -->

    <!-- BEGIN #mobile-menu -->
    <div id="mobile-menu">
        <div id="mobile-inner"></div>
    </div>
    <!-- END #mobile-menu -->

    </div>

    <div id="categories-bar"></div>

</div>
<div id="masthead-space"></div>
<!-- END #masthead -->

<!-- BEGIN #wrapper-->
<div id="wrapper">

    <!-- BEGIN #page-->
    <div id="page">

        <div id="main" class="clearfix">

            <div id="container" class="clearfix">

                <!--BEGIN #content -->
                <div id="content">
                    <div id="sidebar"></div><!-- #sidebar --> 
                </div>

            </div>

        <!--END #main -->
        </div>

    <!--END #page -->
    </div>

<!--END #wrapper -->
</div>

<!--BEGIN #bottom -->
<div id="bottom">

    <!--BEGIN #footer -->
    <div id="footer"></div>

</div>

9 个答案:

答案 0 :(得分:1)

我的建议:

创建2个具有所需特征的CSS类,并在到达断点后切换两者,1必须在开始时处于活动状态。

FIDDLE

<强> JS

var changePoint = $('#reaching_the_top_of_this_element_activates_change').offset().top;

$(window).scroll(function ()  {
if ($(window).scrollTop() >= changePoint) {
    $('#sidebar').removeClass('blackStatic');
    $('#sidebar').addClass('redFixed');
}
else {
    $('#sidebar').addClass('blackStatic');
    $('#sidebar').removeClass('redFixed');
}

});

<强> CSS

.blackStatic {
    position: static;
    background-color: black;
    color: red;
}
.redFixed {
    position: fixed;
    top: 0;
    background-color: red;
    color: black;
}

答案 1 :(得分:0)

正如我在评论中所说,这可能是关闭的,因为我现在无法看到html的结构。但是这样的事情应该有效。我们得到scrollbarcontainer的高度(+标题的高度),以及用户或client的可查看区域的高度。因此,使用数学,我们可以说当container - scrollTop小于scrollbar的高度时,我们需要滚动条停止修复。此时我们删除固定类并添加只有1个属性的底层类。 bottom: 0。现在只要滚动条位于容器内部并且容器具有position: relative,它的底部就会固定到容器的底部。

使用Javascript:

jQuery(window).scroll(function(){
    var sidebarHeight = jQuery('#sidebar').height(),
        containerHeight = jQuery('#container').height() + 173,
        scrollTop = jQuery(window).scrollTop(),
        clientHeight = scrollTop + jQuery(window).height(),
        threshold = 20;
    if(scrollTop >= 20){
        jQuery('#sidebar').addClass('fixed');
    }else if(containerHeight - scrollTop <= sidebarHeight){
        jQuery('#sidebar').removeClass('fixed').addClass('bottom');
    }
});

CSS:

#sidebar.bottom {
    bottom: 0;
}

如果这对您不起作用,请告诉我,并将您的问题更新为html,以便更好地满足您的需求。此外,您还必须处理用户向上滚动页面的问题,目前这不会解决,但不会很难添加。

答案 2 :(得分:0)

看看bootstrap-affix.js http://getbootstrap.com/2.3.2/javascript.html#affix

它完全符合您的要求,您可以使用html5数据属性来添加行为:

<div data-spy="affix" data-offset-top="200">...</div>

答案 3 :(得分:0)

尝试此代码(我根据您的标记使用了ID):

function sidebarScroll()
{
  var tmpWindow = $(window),
      wrapper = $('#wrapper').height(),
      header = $('#header').height(),
      sidebar = $('#sidebar'),
      offsetTop = sidebar.offset().top,
      offsetBottom;

  tmpWindow.scroll(function(){

    offsetBottom = (wrapper + header) - sidebar.height();

    if (tmpWindow.scrollTop() < offsetTop) {
      sidebar.removeClass('fixed bottom');
    } else if (tmpWindow.scrollTop() > offsetBottom) {
      sidebar.removeClass('fixed').addClass('bottom');
    } else {
      sidebar.removeClass('bottom').addClass('fixed');
    }
  });
}

sidebarScroll();

这是你需要的课程:

#wrapper {
  position: relative;
}
#sidebar {
  width: 220px;
  position: absolute;
  right: 0;
}

#sidebar.fixed {
  position: fixed;
  top: 0;
}

#sidebar.bottom {
  position: absolute;
  bottom: 0;
}

DEMO

答案 4 :(得分:0)

你从亚当借来的代码被错误地复制了。您使用scrollTop()而不是scrollTop。 scrollTop设置为一个数字,所以基本上,你试图做20()(或者设置为scrollTop的任何数字)

编辑:为了减少代码的冗余,我重写了它只是为了通过三元if语句设置阈值:

jQuery(window).scroll(function () {
    var sidebarHeight = jQuery('#sidebar').height(),
    containerHeight = jQuery('#container').height() + 173,
    scrollTop = jQuery(window).scrollTop(),
    clientHeight = scrollTop + jQuery(window).height(),
    threshold = (jQuery(document.body).hasClass("home"))?654:((jQuery(document.body).hasClass("single") || jQuery(document.body).hasClass("page"))?20:236);
});

答案 5 :(得分:0)

<div class="main">
</div>
<div class="foot">
</div>
<div id="float">
<div class="float_content_head">
I was sending javascript to display
</div><div class="float_content">
d my issue was that I was sending javascript to display console messages. Even when I looked at the file in my browser (not through the application) it showed exactly as I expected it to (eg the extra tags weren't showing), but there were showing in the html/text output and were trying to be parsed. Hope this helps someone!I had a similar problem, and my issue was that I was sending tags we
</div>
</div>

Css
<style type="text/css">
#float{
    background: #fff;
    position:absolute;
    right:30px;
    top:20px;
    width:250px;
    padding:10px;
    border-radius: 6px;
    -webkit-box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.43);
-moz-box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.43);
box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.43);
}
.float_content_head{
    padding:10px;
    border-bottom: 1px solid #efefef;
    text-align:center;
}
.float_content{
    padding-top:10px;
}
.main{
    width: 800px;
    height: 800px;
    margin: 0 auto;
    border:1px solid #efefef;
    padding: 10px;
    background:#ccc;
}
.foot{
    width: 100%;
    height: 800px;
    margin: 0 auto;
    border:1px solid #efefef;
    padding: 10px;
    background:#096;
}
#box p{
    margin:0;
    padding:0;
}
</style>

JS
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript"> 
$(document).ready(function() {
var starting_position = $('#float').offset();
var top_padding = 50;
var bottom_limit = $('.foot').offset();
var box_height = $('#float').height() + 20;
$(window).scroll(function(){
var top_window = $(window).scrollTop();
if (top_window > starting_position.top && top_window < bottom_limit.top - box_height){
$('#float').stop().animate({top: top_window - starting_position.top + top_padding}, 400);
} else if (top_window > bottom_limit.top - starting_position.top - box_height){
$('#float').stop().animate({top: bottom_limit.top - starting_position.top - box_height }, 400);
} else { $('#float').stop().animate({top: 10 }, 400);           
}
});
});
</script>

答案 6 :(得分:0)

听起来像this is what you're after(原谅我的身份证):

$(document).ready(function() {
// Get the inital position of the menu
    var initialPos = $('#mainnav').offset().top;

//Bind scrolling or resizing
$(window).bind('scroll resize', function() {

// Get the distance from the top of the page to the top of the footer
    var footerTop = $('#footer').length > 0 ? $('#footer').offset().top : $('#footer').offset().top;

// Get the distance from the top of the page to the bottom of the menu
    var navBottom = $(window).scrollTop() + $('#mainnav').height() + 22;

// If the user scrolls further than the height of the header (this method allows for resizing with a max-width layout)
    if ($(window).scrollTop() > initialPos) {
        $('#mainnav').css({
            'position': 'fixed',

           // move the menu based on how far the user has scrolled, and if it exceed the height of the footer
            'top': (footerTop - navBottom > 0 ? 0 : footerTop - navBottom) + 'px',
            'left': ($('#wrapper02').offset().left - $(window).scrollLeft()) + 'px'
        });
    } else {
        $('#mainnav').css({
            'position': 'static'
        });
    }
});
});

答案 7 :(得分:0)

    <style>

     #wrap {
     width:100%;
     height:1000px;
 }  
 #sidebar {
    width:100px;
    height:100px;
    float:left;
    background-color:black;
    color:white;
    vertical-align:middle;
    text-align:center;
 }
    </style>

    <script>
     var offset = $("#sidebar").offset();
 var topPadding = 15;

 $(window).scroll(function () {
    if ($(window).scrollTop() > offset.top) {
        $("#sidebar").stop().animate({
            marginTop: $(window).scrollTop() - offset.top + topPadding
        });
    } else {
        $("#sidebar").stop().animate({
            marginTop: 0
        });
    }
 });

    </script>

    <div id='wrap'>
        <div id="sidebar">Side Bar</div>
    </div>

答案 8 :(得分:0)

一个选项是waypoints.js,但我认为你可以用一些简单的jQuery来做。航点可能适合您,可能不是......但它可以在这种情况下使用。所以这是一个选择。

Waypoints.js: http://imakewebthings.com/waypoints/