我使用的Bootstrap不正确，因此我正在重写代码。我可以理解，遵循以下结构很重要：container > row > col。我正在使用卡片，因此，当视口在768px以下时，块元素将是卡片。演示可以在这里查看：
在我正确使用Bootstrap之前：Before rewrite
在我重写正确的Bootstrap之后：After rewrite to bootstrap
在我重写以正确使用Bootstrap之后，块元素在彼此之上飞行。如我所见-它是类：<div class="index-content">导致了此问题。如果该类低于row，则它可以工作，但是如果我将<div class="index-content">设置在<div class="col-sm-4">内，则这些块会飞来飞去。
有人知道我该如何解决这个问题？
我曾经工作过的原始代码如下：
<div class="row">
<div class="index-content">
<div class="container">
<div class="col-sm-4 small-padding right bottom">
<div class="card">
<img src="https://image.ibb.co/iiWA2T/bmw_1.jpg"></img>
<div class="card-content">
<h4>BMW NEW MODELS</h4>
<a href="#" class="blue-button">Read More</a>
</div>
</div>
</div>
<div class="col-sm-8 small-padding left">
<div class="card">
<img src="https://image.ibb.co/nJ97Go/bmw.jpg"></img>
<div class="card-content">
<h4>BMW NEW MODELS</h4>
<!-- <p>Brødtekst</p> -->
<a href="#" class="blue-button">Read More</a>
</div>
</div>
</div>
</div>
</div>
</div>
重写为正确的Bootstrap后：
<div class="container">
<div class="row">
<div class="col-sm-4 small-padding right bottom">
<div class="index-content">
<div class="card">
<img src="https://image.ibb.co/iiWA2T/bmw_1.jpg"></img>
<div class="card-content">
<h4>BMW NEW MODELS</h4>
<a href="#" class="blue-button">Read More</a>
</div>
</div>
</div>
<div class="col-sm-8 small-padding left">
<div class="card">
<img src="https://image.ibb.co/nJ97Go/bmw.jpg"></img>
<div class="card-content">
<h4>BMW NEW MODELS</h4>
<!-- <p>Brødtekst</p> -->
<a href="#" class="blue-button">Read More</a>
</div>
</div>
</div>
</div>
</div>
</div>
<style>
/* Card and Button */
.index-content a:hover {
color: black;
text-decoration: none;
}
.index-content {
/*margin-bottom: 20px;*/
/*padding: 50px 0px;*/
}
.index-content .row {
margin-top: 20px;
}
.index-content a {
color: black;
}
.index-content .card {
background-color: #FFFFFF;
padding: 0;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
box-shadow: 0 4px 5px 0 rgba(0, 0, 0, 0.14), 0 1px 10px 0 rgba(0, 0, 0, 0.12), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
}
.index-content .card:hover {
box-shadow: 0 16px 24px 2px rgba(0, 0, 0, 0.14), 0 6px 30px 5px rgba(0, 0, 0, 0.12), 0 8px 10px -5px rgba(0, 0, 0, 0.3);
color: black;
}
.index-content .card img {
width: 100%;
border-top-left-radius: 4px;
border-top-right-radius: 4px;
height: 350px;
}
.index-content .card h4 {
margin: 20px;
}
.index-content .card p {
margin: 20px;
opacity: 0.65;
}
.index-content .blue-button {
width: 100px;
-webkit-transition: background-color 1s, color 1s;
/* For Safari 3.1 to 6.0 */
transition: background-color 1s, color 1s;
min-height: 20px;
background-color: #002E5B;
color: #ffffff;
border-radius: 4px;
text-align: center;
font-weight: lighter;
margin: 0px 20px 15px 20px;
padding: 5px 0px;
display: inline-block;
}
.index-content .blue-button:hover {
background-color: #dadada;
color: #002E5B;
}
@media (max-width: 768px) {
.index-content .col-lg-4 {
margin-top: 20px;
}
}
@media (min-width: 768px) {
.card {
position: relative;
}
.card-content {
position: absolute;
bottom: 0;
width: 100%;
background: rgba(0, 0, 0, 0.5);
}
.card-content h4,
.card-content p {
color: white;
width: 100%;
float: left;
margin: 0 0 5px;
}
.card-content a {
float: right;
}
.index-content .card h4,
.index-content .card p {
padding: 15px 20px;
margin: 0;
}
.index-content .card p {
padding: 0 20px 15px;
margin: 0;
}
}
/* GRID ELEMENTS */
/* Set width between block elements */
.small-padding.top {
padding-top:10px;
}
.small-padding.bottom {
padding-bottom:10px;
}
.small-padding.left {
padding-left:5px;
}
.small-padding.right {
padding-right:5px;
}
/* Media quries */
@media only screen and (max-width: 768px) {
.small-padding.bottom {
padding-bottom:10px;
}
}
@media only screen and (max-width: 768px) {
.row [class*="col-"] {
padding-left: 5px;
padding-right: 5px;
}
}
</style>
答案 0 :(得分：0)
<body>
<div>
<!-- search bar -->
<div>
<h1>List of Vehicles </h1>
<mat-form-field style="margin: 0 0 15px 0;" class="example-full-width">
<input matInput #message maxlength="256" placeholder="Search for vehicle.." [ngModel]="message.value" (keyup)='filter(message.value)'>
<mat-hint align="start">
<strong>Type vehicle name</strong>
</mat-hint>
</mat-form-field>
</div>
<!-- map, showing the position of the vehicles -->
<div id="mapid">
</div>
<!-- progressbar -->
<mat-progress-bar *ngIf="disabled" mode="indeterminate" class="progressbar"></mat-progress-bar>
<!-- list of alarms of selected vehicle -->
<div class="details">
<mat-nav-list>
<h3>List of alarms: ..... </h3>
<mat-list-item *ngFor=".... ">
<p matLine style="white-space: normal">
<span [ngClass]="...."> .... </span> :
<span style="font-weight: bold;"> Description: </span> ....
<br/>
<span style="font-weight: bold;"> Details: </span> ....</p>
</mat-list-item>
</mat-nav-list>
<mat-nav-list>
<h3>Signal Information: .... </h3>
<mat-list-item *ngFor=".... ">
<p matLine>
<span style="font-weight: bold"> .... </span>
</p>
</mat-list-item>
</mat-nav-list>
</div>
<!-- list of vehicles -->
<aside class="vehiclelist">
<mat-nav-list matSort (matSortChange)="sortData($event)">
<th mat-sort-header="timestamp">Latest alarm</th>
<th mat-sort-header="status">Status</th>
<mat-list-item *ngFor="...." class="vehicles">
<span [ngClass]=....>
</span>
<p matLine> .... </p>
<button mat-icon-button id="btn" *ngIf=...>
<mat-icon>info</mat-icon>
</button>
</mat-list-item>
</mat-nav-list>
</aside>
</div>
</body>