防止模态滚动

问题描述

我遇到了一个问题，我创建了一个占据完整高度和宽度的模式，但它是可滚动的.这会破坏应用程序，因为模式停留在上方，并且用户可以与页面的不同部分进行交互.

I am stuck on a problem where I've created a modal that occupies the complete height and width, but it scrollable. This breaks the application since the modal stays above and the user can interact with different parts of the page.

模态 HTML

<div id="cancel_modal" class="card__modal">
  <div class="card__modal-container">
    <h5>Are you sure you want to cancel?</h5>
    <p>All information will be deleted</p>
    <div class="card__btn-container">
      <button id="cancel_modal_yes" class="btn btn-danger">Yes</button>
      <button id="cancel_modal_no" class="btn">No</button>
    </div>
  </div>
</div>

模态 CSS

card__modal {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: rgba(0, 0, 0, .4);
  z-index: 99;
  height: 100%;
  width: 100%;
  text-align: center;

  &-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    padding: 2rem 5rem;
  }
}

我尝试过 overflow: hidden、position: fixed 和 position:sticky，但似乎没有任何效果.帮助将不胜感激.

I have tried overflow: hidden, position: fixed and position: sticky, but nothing seems to work. Help would be appreciated.

推荐答案

模态框只是一个弹出对话框，它:(a)弹出其他内容的上方，以及(b) 通常会阻止您与基础页面进行交互，直到它关闭.(也称为 灯箱 )

A modal is just a pop-up dialog box that: (a) pops-up overtop of other content, and (b) usually prevents you from interacting with the underlying page until it is closed. (Also known as a lightbox )

这是我如何做一个简单的模式来阻止用户继续与视口交互(下面的工作演示).

Here's how I do a simple modal that prevents user from continuing to interact with viewport (working DEMO below).

模态框由两部分组成:(a) 覆盖层，覆盖网页内容并阻止用户交互，以及 (b) 对话框，位于覆盖层之上.

The modal is comprised of two parts: (a) an overlay, that covers the webpage content and prevents user from interacting, and (b) the dialog, which sits on top of the overlay.

(1) OVERLAY:使用 position:fixed 并位于页面内容上方(z-index)；

(1) OVERLAY: use position:fixed and sits above the page content (z-index);

(2) DIALOG:使用 position:fixed 并将其置于覆盖层上方(再次为 z-index).

(2) DIALOG: use position:fixed and sit it above (z-index again) the overlay.

我还使用 vw 或百分比单位来调整覆盖/对话框的大小，因此可以适应不同的屏幕尺寸.

(3) 显示模态时，这样做:

(3) When displaying modal, do this:

1. 同时显示叠加层和对话框.z-index 将它们放在页面内容上方并阻止用户点击任何内容 - 但是，用户仍然可以滚动页面

1. Show overlay and dialog, together. The z-index places them above the page content and prevents the user from clicking anything - however, the user can still scroll the page

将类添加到您的主容器(或主体?):

Add class to your main container (or to the body?) that:

(a) 将 overflow-y 设置为 hidden - 这会隐藏垂直滚动条(用户不能再滚动页面) 将其注释掉并观察会发生什么.

(a) sets overflow-y to hidden - this hides the vertical scrollbar (user can no longer scroll the page) Comment that out and watch what happens.

(b) 当垂直滚动条被隐藏时，页面会变大.所以我们添加了一些 css 来缩小容器(body?)的宽度，这样当滚动条被隐藏时，丢失的滚动条不会导致页面 jump (再次，注释掉那个部分并注意！)

(b) When the vertical scrollbar is hidden, the page will grow larger. So we add some css that narrows the container (body?) width just enough so the missing scrollbar doesn't cause the page to jump when the scrollbar is hidden (again, comment that part out and watch!)

这是一个 jsfiddle，可以让你玩耍、注释掉等等.

Here's a jsfiddle that will let you play around, comment things out, etc.

嵌入式演示:

$('#btnModl').click(function(){
  //$(this).hide(); //not necc - hides the button you clicked
  $('#olay, #modl').fadeIn();
  $('body').addClass('modl_active');
});

$('#modl_x').click(function(){
  $('body').removeClass('modl_active');
  $('#olay, #modl').fadeOut();
  //$('#btnModl').fadeIn();
});

#olay{position:fixed;width:100vw;height:100vh;z-index:998;}
#modl{position:fixed;top:10vw;left:30vw;width:40vw;height:50vh;z-index:999;}

#modl_x{padding:0 10px;text-align:right;color:white;}
#modl_x:hover{cursor:pointer;}

#olay{background:black;opacity:0.5;display:none;}
#modl{background:darkcyan;color:pink;display:none;}

.modl_active{overflow-y:hidden;width:90vw;}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

<div id="olay"></div>
<div id="modl">
  <div id="modl_x"> x </div>
  <div><br>Once upon a midnight dreary<br>While I pondered weak and weary<br>Over many a quaint and curious<br>bit of css and javascript...</div>
</div>


<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
<p><button id="btnModl">OPEN MODAL</button></p>
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