在滚动后修复div位置并使用响应宽度

Question

我的目标是在某些滚动后显示div为固定位置，并以响应宽度显示div元素。

在下面的示例脚本的作品，但我希望有与橙色元素相同的宽度（响应）。

.fixed { 
    position: fixed; 
    top: 0px; 
    z-index': 10000; 
} 

Example

Answer 1

我找不到的响应宽度的CSS的解决方案。 RahulB的答案有效，但只使用固定宽度。这里是一个负责任的JS解决方案，包括增加窗口大小调整功能：

function resizeFixed() { 
    var orWidth = $('.wrapper .group .span_4_of_4').width(); 
    $('.fixed').css('width', orWidth); 
} 

演示：http://jsfiddle.net/Treeindev/4k93t136/1/

Answer 2

在固定的z-index错字和增加宽度420PX;

.fixed { 
    position:fixed; 
    top: 0px; 
    z-index: 10000; 
    width: 420px; 
} 

演示：http://jsfiddle.net/y5fo1emc/33/

Answer 3

试试这个

<section id="mainContainer"> 

<div class="section group"> 
    <div class="col span_4_of_4"> 
<img src="http://placehold.it/500x150"> 


    </div> 

    <div class="box-inner"> 
    <div class="section group wrapper"> 
    <div class="col span_4_of_4 box"> 
<h1> 
I will be fixed after scrolling 
</h1> 
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. 

    </div> 


<div class="section group"> 
    <div class="col span_4_of_4"> 
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Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. 

Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. 


    </div> 
    </div> 
    </div> 
    </section> 



    $(document).ready(function() { 

    $(window).scroll(function() { 
     if ($(this).scrollTop() > 100) { 
      $('.box-inner').addClass('fixed'); 
     } else { 
      $('.box-inner').removeClass('fixed'); 
     } 
    }); 
}); 

现场演示 - http://jsfiddle.net/grinmax_/y5fo1emc/37/