我正在使用bootstrap 3为angular 4应用程序开发网页。
尝试添加搜索按钮（右上/左上），单击该按钮将在下一行展开。Refer top right corner search button here.

<div class="row">
 <div class="col-xs-3">
  <form id="demo-2" style="margin-left: 10px">
    <input type="search" placeholder="Search..">
  </form>
 </div>
</div>

CSS

input {
  outline: none;
}
input[type=search] {
  -webkit-appearance: textfield;
  -webkit-box-sizing: content-box;
  font-family: inherit;
  font-size: 100%;
}
input::-webkit-search-decoration,

input[type=search] {
  background: #ededed url(https://static.tumblr.com/ftv85bp/MIXmud4tx/search-icon.png) no-repeat 9px center;
  border: solid 1px #ccc;
  padding: 7px 9px 7px 17px;
  width: 55px;

  border-radius: 1em;

  -webkit-transition: all .5s;
  -moz-transition: all .5s;
  transition: all .5s;
}
input[type=search]:focus {
  width: 170px;
  background-color: #fff;

  -webkit-box-shadow: 0 0 5px rgba(109,207,246,.5);
  -moz-box-shadow: 0 0 5px rgba(109,207,246,.5);
  box-shadow: 0 0 5px rgba(109,207,246,.5);
}

#demo-2 input[type=search] {
  width: 15px;
  padding-left: 10px;
  color: transparent;
  cursor: pointer;
}
#demo-2 input[type=search]:hover {
  background-color: #fff;
}
#demo-2 input[type=search]:focus {
  width: 200px;
  padding-left: 32px;
  color: #000;
  background-color: #fff;
  cursor: auto;
  color: black;
}
#demo-2 input:-moz-placeholder {
  color: transparent;
}
#demo-2 input::-webkit-input-placeholder {
  color: transparent;
}

这给了我搜索栏在同一行展开。我试着得到相同的例子。但他们都谈论展开同一行。
注意：桌面视图得搜索栏与搜索按钮将位于同一行. Similar to this.将根据移动的视图得不同而变化.
提前感谢，欢迎提出建议。