css - 如何设置 mat-option 文本的样式以在悬停在每个 mat-option 文本上时在 mat-select 面板外获取文本

Question

我想在每个 mat-option 文本上设置悬停样式，我希望文本显示在 mat-option 之外。为了实现这一点，我应用了非常高的 z-index 值，但没有任何改变。我尝试将 z-index 添加到更高的值，但这没有成功。

我受到以下启发 stackblitz link

这是当前的行为

这是我需要的

这是代码片段

template.html

<mat-form-field [style.cursor]="pointer"  [style.width.px]=450 >
  <input  id="inputCustomer" matInput [matAutocomplete]="auto"  [formControl]="customerFilterControl" [(ngModel)]="customerName">

   <mat-autocomplete  style="left:775px;" #auto="matAutocomplete" [displayWith] = "displayFn" >
    <mat-option  (onSelectionChange)="onCustomerChange(customer)" [value] ="customer.AccountID +' '+'('+ customer.AccountName + ')'">
       <span>{{customerName}}</span>
  <span id="para2">{{customerName}}</span>
    </mat-option>
</mat-autocomplete>

template.ts

  customer:Array<any>;
  filteredOptions: Observable<any[]>;
  customerFilterControl = new FormControl();
customer =[
{
AccountID :1,
AccountName:"account1"
},
{
 AccountID:2,
 AccountName:"account2"
},
{
 AccountID:3,
 AccountName:"Earliest_Creation_Date_Ent_Tests_id7 (Earliest_Creation_Date_Ent_Tests_id7accountName)"
}

  displayFn(subject) {
    return subject ? subject : undefined;  
  }


onCustomerChange(customer) {
this.filteredOptions = this.customerFilterControl.valueChanges.pipe(
  startWith(''),
  map(value => this._filter(value))
 );  
}


  _filter(value:any):any[] {

    const filterValue = value;
    return this.customers.filter(function (option) {
       if(option.AccountID.includes(filterValue) | option.AccountName.includes(filterValue)) {
          return option;
        }
    }); 
  }

模板.scss

#para2 {
display:none;
}
.mat-option:hover {
  background-color: white !important;
  z-index:500000 !important;
  width:440px !important;
  word-break: break-all !important; 
}


.mat-option-text {
  padding-left: 60px !important;
  overflow: auto !important;
  text-overflow: unset !important; 
}


.mat-option {

    &:hover {
        white-space: unset!important;
        overflow: unset !important;
        background-color: #FFFFFF;


        #para2
        {

            z-index:500000 !important;
            width:400px !important;
            word-break: break-all !important; 
            display: block;
            position: relative !important;
            overflow: visible !important;
            text-align: left;
            top:0px;
            right:50px !important;
            background-color: #232F34;
            color:#FFFFFF;
            border: 5px !important;
            font-size:11px;


        }
    }
}

Answer 1

当悬停在每个选项上方时，您是否考虑过为每个垫选项使用 matTooltip？

添加一个

matTooltip="{{state.name}} | Population: {{state.population}}"

在 mat-option 上， Angular Material 完成剩下的工作。

检查工作示例 here