如何使用 bootstrap 行 class 为卡片创建 3 列

Question

我正在尝试使用 bootstrap 4 行 class 在三个不同的列中显示我页面的内容（显示在卡片中）。我该怎么做？

我正在使用 Laravel 5.8 和 bootstrap 4. 轮播和导航栏等其他 bootstrap 功能正常工作。

主要内容的代码 blade file-views/layout/app.blade.php 如下所示；

<div class="container-fluid">
     @yield('content')                   
</div>

那么我想要的页面 layout-views/pages/secondpage.blade.php 是;

@extends('layout.app')

@section('content')

        <div class="col-12 text-center">
            <h2> Page caption</h2>
        </div>

<div class="row">

        <div class="col-sm-6 col-md-4">
            <div class="card border-white">
                <div class="card-header">Heading 1</div>
                    <div class="card-body">
                        <p class="card-text">Some quick example text to build 
                           on the card 
                        title and make up the bulk of the card's content.</p>
                    </div>
                </div>
            </div>
        </div>

        <div class="col-sm-6 col-md-4">
            <div class="card border-white">
                <div class="card-header">Heading 2</div>
                    <div class="card-body">
                        <p class="card-text">Some quick example text to build 
                          on the card 
                        title and make up the bulk of the card's content.</p>
                    </div>
                </div>
            </div>
        </div>

        <div class="col-sm-6 col-md-4">
            <div class="card border-white">
                <div class="card-header">Heading 3</div>
                    <div class="card-body">
                        <p class="card-text">Some quick example text to build 
                         on the card 
                        title and make up the bulk of the card's content.</p>
                    </div>
                </div>
            </div>
        </div>

</div>

@endsection

我希望看到卡片排列在三个不同的列中，但它们都在一个列中。

Answer 1

你有一个额外的 div 关闭标签，用于所有三个这就是为什么你把所有的都放在一栏中

<div class="row">

        <div class="col-sm-6 col-md-4">
            <div class="card border-white">
                <div class="card-header">Heading 1</div>
                    <div class="card-body">
                        <p class="card-text">Some quick example text to build 
                           on the card 
                        title and make up the bulk of the card's content.</p>
                    </div>
                </div>
            <!--</div>-->
        </div>

        <div class="col-sm-6 col-md-4">
            <div class="card border-white">
                <div class="card-header">Heading 2</div>
                    <div class="card-body">
                        <p class="card-text">Some quick example text to build 
                          on the card 
                        title and make up the bulk of the card's content.</p>
                    </div>
                </div>
            </div>
            <!--</div>-->

        <div class="col-sm-6 col-md-4">
            <div class="card border-white">
                <div class="card-header">Heading 3</div>
                    <div class="card-body">
                        <p class="card-text">Some quick example text to build 
                         on the card 
                        title and make up the bulk of the card's content.</p>
                    </div>
                </div>
            </div>
            <!--</div>-->

</div>

Answer 2

这是由于每个 col-md-4 div 之后的额外 div 造成的。我在 HTML.

中做了一些更正

<div class="row">

  <div class="col-sm-6 col-md-4">
    <div class="card border-white">
      <div class="card-header">Heading 1</div>
      <div class="card-body">
        <p class="card-text">Some quick example text to build
          on the card
          title and make up the bulk of the card's content.</p>
      </div>
    </div>
  </div>


<div class="col-sm-6 col-md-4">
  <div class="card border-white">
    <div class="card-header">Heading 2</div>
    <div class="card-body">
      <p class="card-text">Some quick example text to build
        on the card
        title and make up the bulk of the card's content.</p>
    </div>
  </div>
</div>


<div class="col-sm-6 col-md-4">
  <div class="card border-white">
    <div class="card-header">Heading 3</div>
    <div class="card-body">
      <p class="card-text">Some quick example text to build
        on the card
        title and make up the bulk of the card's content.</p>
    </div>
  </div>
</div>

</div>

如何使用 bootstrap 行 class 为卡片创建 3 列

How to create 3 columns for cards using bootstrap row class

html

css

php

bootstrap-4

laravel-5.8