垂直导航栏必须从顶部移动一点，然后保持固定 [英] Vertical navigation bar must move a bit from top then stay fixed

问题描述

我想要一个垂直导航栏，如 www.callofduty.com/elite 。正如你可以看到在这个页面，右边有3导航链接（CONNECT，COMPETE，IMPROVE）。当您向下滚动时，导航栏会向下移动一点，然后保持固定。

I'm trying to have a vertical navigation bar as in www.callofduty.com/elite. As you can see in this page, to the right there are 3 nav links (CONNECT, COMPETE, IMPROVE). As you scroll down, the nav bar moves down a bit and then stays fixed.

我有一个滚动间谍，固定导航工作。但导航栏不下移一点，保持固定。它只是固定在我定位它。如何实现这个效果？任何洞察力都会有所帮助。

I kindof got scroll-spy, fixed nav working. But the nav bar doesn't move down a bit and stays fixed. It just stays fixed where I positioned it. How to achieve that effect? Any insight would help.

以下是我的工作链接 http ：//jsfiddle.net/RJJ2J/

推荐答案

请参阅 DEMO

Jquery

$(function(){    // this is the shorthand for document.ready
  $(document).scroll(function(){    // this is the scroll event for the document

    scrolltop = $(document).scrollTop(); // by this we get the value of the scrolltop ie how much scroll has been don by user
    if(parseInt(scrolltop) >= 80)    // check if the scroll value is equal to the top of navigation
      { 
        $("#navbar").css({"position":"fixed","top":"0"});   // is yes then make the position fixed to top 0
      }
    else
    {
      $("#navbar").css({"position":"absolute","top":"80px"}); // if no then make the position to absolute and set it to 80
    }
  })

});

CSS

#navbar{
    position: absolute;   // Initially set to absolute so it is movable with the page
    top: 80px; right: 100px;
    /*display: block;*/
    padding-right: 7px;
    background: #fff;
}

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