角度6的可扩展搜索栏

你必须使用ngClass,我添加类“filled”时,单击并删除如果模糊和没有价值

<div class="right">
  <form id="search">
    <input #search type="search" placeholder="Search" [ngClass]="{'filled':filled}" 
         (click)="filled=true" (blur)="filled=search.value?true:false"> 
  </form>
</div>

//remove in your css
//#search input[type=search]
//And add (is the same adding .filled)
#search input[type=search].filled
{
  width: 400px;
  padding-left: 32px;
  color: #4a83c0;
  background-color: #fff;
  cursor: auto;

}

关闭按钮可以是

<div class="right">
  <form id="search">
    <input #search type="search" [placeholder]="filled?'Search':''" [ngClass]="{'filled':filled}" 
         (click)="filled=!filled" (blur)="filled=search.value?true:false">
         <button class="close" *ngIf="filled" (click)="search.value='';filled=false">X</button>
  </form>
</div>
.close
{
  z-index:10;
  margin-left:-3rem;
  margin-right:1rem;
}

你可以把条件类放在你的搜索输入上,只有当它有一个非空的值时才存在,然后专门针对你的CSS。类似于:

<input type="search" [class.has-value]="searchValue" placeholder="Search">

input[type=search]:focus, input.has-value {
   ...
}