当我向下滚动时，Jumptron背景图像消失
当我向下滚动时，Jumptron背景图像消失
提问于 2017-02-19 08:45:23
我正在使用bootstrap jumptron和背景图像。当我向下滚动时，背景图像消失了，只剩下jumptron div类只显示标题。如何修复它，当我向下滚动时，图像不会消失。其他内容工作正常，下面的文件提供了更多详细信息。以下文件位于Rails 5应用程序中。
index.html.erb
<div class="bg"></div>
<div class="jumbotron">
<h1>Organize and Mobilize</h1>
</div>
<div class="container">
<div class="row">
<h2>We need you to take action</h2>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pharetra varius quam sit amet vulputate.
Quisque mauris augue, molestie tincidunt condimentum vitae, gravida a libero. Aenean sit amet felis
dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. Duis elementum auctor accumsan.
Aliquam in felis sit amet augue.
<br>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pharetra varius quam sit amet vulputate.
Quisque mauris augue, molestie tincidunt condimentum vitae, gravida a libero. Aenean sit amet felis
dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. Duis elementum auctor accumsan.
Aliquam in felis sit amet augue.
<br>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pharetra varius quam sit amet vulputate.
Quisque mauris augue, molestie tincidunt condimentum vitae, gravida a libero. Aenean sit amet felis
dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. Duis elementum auctor accumsan.
Aliquam in felis sit amet augue.
<br>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pharetra varius quam sit amet vulputate.
Quisque mauris augue, molestie tincidunt condimentum vitae, gravida a libero. Aenean sit amet felis
dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. Duis elementum auctor accumsan.
Aliquam in felis sit amet augue.
</div>
<hr>
<div class="row">
<h2>Page Content</h2>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pharetra varius quam sit amet vulputate.
Quisque mauris augue, molestie tincidunt condimentum vitae, gravida a libero. Aenean sit amet felis
dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. Duis elementum auctor accumsan.
Aliquam in felis sit amet augue.
<h2>Page Content</h2>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pharetra varius quam sit amet vulputate.
Quisque mauris augue, molestie tincidunt condimentum vitae, gravida a libero. Aenean sit amet felis
dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. Duis elementum auctor accumsan.
Aliquam in felis sit amet augue.
<h2>Page Content</h2>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pharetra varius quam sit amet vulputate.
Quisque mauris augue, molestie tincidunt condimentum vitae, gravida a libero. Aenean sit amet felis
dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. Duis elementum auctor accumsan.
Aliquam in felis sit amet augue.
</div>
<hr>
<div class="row">
<h2>Page Content</h2>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pharetra varius quam sit amet vulputate.
Quisque mauris augue, molestie tincidunt condimentum vitae, gravida a libero. Aenean sit amet felis
dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. Duis elementum auctor accumsan.
Aliquam in felis sit amet augue.
</div>
</div>
<hr>
<div class="container">
<div class="row">
<div class="col-md-12 text-center"><p>The End.</p></div>
</div>
</div>
bootstrap_and_overrides.css
/*
=require twitter-bootstrap-static/bootstrap
Static version of css will use Glyphicons sprites by default
=require twitter-bootstrap-static/sprites
*/
body { padding-top: 50px; }
.bg {
background: url('protest.jpg') no-repeat center center;
position: fixed;
width: 100%;
height: 450px; /*same height as jumbotron */
top:0;
left:0;
z-index: -1;
}
.jumbotron {
margin-bottom: 50px;
height: 350px;
color: white;
text-shadow: black 0.3em 0.3em 0.3em;
background:transparent;
}
和cable.js
// Action Cable provides the framework to deal with WebSockets in Rails.
// You can generate new channels where WebSocket features live using the rails generate channel command.
//
//= require action_cable
//= require_self
//= require_tree ./channels
(function() {
this.App || (this.App = {});
App.cable = ActionCable.createConsumer();
}).call(this);
var jumboHeight = $('.jumbotron').outerHeight();
function parallax(){
var scrolled = $(window).scrollTop();
$('.bg').css('height', (jumboHeight-scrolled) + 'px');
}
$(window).scroll(function(e){
parallax();
});
这是我滚动页面之前的图像：
回答 1
Stack Overflow用户
发布于 2017-02-19 09:55:40
你不应该把一张图片作为巨型加速器的背景，这不是它的目的。
相反，请使巨型背景颜色透明，然后将背景图像添加到容器外部的div中。
即。在HAML中
#YourDivToApplyBackground
.container
.row
.col-md-12
.jumbotron
%h1 Your Page Title这就是你的代码在bootstrap中的样子。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/42322370
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