为什么Bootstrap 4导航栏始终崩溃? [英] Why is the Bootstrap 4 Navbar always collapsed?

问题描述

我更新到了ng-bootstrap的v1.0-beta.现在，导航栏始终处于折叠状态.当我单击汉堡包切换菜单时，它会打开，但垂直显示内容而不是水平显示.

I updated to the v1.0-beta of ng-bootstrap. Now the navbar is always collaped. When I click on the hamburger to toggle the menu, it opens, but displays the contents vertically rather than horizontally.

我在下面包含了导航的代码.和以前一样.在这一点上，我不能弄清楚问题出在ng-bootstrap，bootstrap 4还是它们的组合.

I've included the code for the nav below. It's the same as it before. At this point I can't tease out if the issue lies with ng-bootstrap, bootstrap 4 or a combination thereof.

我的理想结果是菜单仅在屏幕尺寸达到一定尺寸后才出现，就像过去一样.

My ideal outcome is for the menu to only appear once the screen is under a certain size, like in the old days.

我确实看到了 Bootstrap4导航栏始终折叠.我已经打开了这个问题，因为它不包含ng-bootstrap.

I did see Bootstrap4 navbar always collapsed. I've opened this question since it did not include ng-bootstrap.

<nav class="navbar navbar-toggleable-sm navbar-light bg-faded fixed-top" style="background-color: white">
  <button class="navbar-toggler navbar-toggler-right" 
    type="button" (click)="isNavbarCollapsed = !isNavbarCollapsed" 
    aria-controls="exCollapsingNavbar2"
    data-toggle="collapse"
    aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <a class="navbar-brand" href="#">Vesalius - Bobby's World</a>
  <div [ngbCollapse]="isNavbarCollapsed" class="collapse navbar-collapse" id="exCollapsingNavbar2">
    <div class="navbar-nav mr-auto">
      <a class="nav-item nav-link" routerLink="/provider/portal/" routerLinkActive="active">Schedule</a>
      <a class="nav-item nav-link" routerLink="/patient/portal/medical-history" routerLinkActive="active">Form Editor</a>
    </div>

    <div class="navbar-nav">
      <form class="form-inline">
        <input class="form-control mr-sm-2" type="text" placeholder="Search Patient">
        <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
      </form>
    </div>
  </div>
</nav>

推荐答案

在Bootstrap 4中，如果希望导航栏水平扩展，则需要navbar-expand*类，否则默认为移动/折叠版本.因此，不包含navbar-expand*类会使导航栏始终折叠.

In Bootstrap 4, the navbar-expand* class is needed if you want the navbar to expand horizontally, otherwise it defaults to the mobile/collapsed version. Therefore, not including the navbar-expand* class makes the Navbar always collapsed.

请参阅以下导航栏断点示例

自Bootstrap 4 beta起，navbar-toggleable-*类已更改为navbar-expand-*.在您的情况下，navbar-toggleable-sm将更改为navbar-expand-md.

As of Bootstrap 4 beta, the navbar-toggleable-* classes have changed to navbar-expand-*. In your case navbar-toggleable-sm would change to navbar-expand-md.

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