从下拉可用选项中删除选定的选项

Question

I have a drop-down and I need to remove the selected option and show the remaining options. thanks in advance

 FacultyorStudent_Data: Array<string> = ['Faculty/Coach','Student'] selected_FacultyorStudent: string = this.FacultyorStudent_Data[0]; SelectFacultyorStudent(FnS){ this.selected_FacultyorStudent=FnS; }

 <div class="text-center" id="perf-type" *ngIf="section=='practice'"> <h4 class="dropdown-toggle" data-toggle="dropdown"> <i class="fa fa-bar-chart" aria-hidden="true"></i> &nbsp; <b>{{selected_FacultyorStudent}} &nbsp; <i class="fa fa-angle-down" style="font-size: 0.7em; font-weight: 700;"></i></b>&nbsp;&middot;<small>beta v4</small> </h4> <ul class="dropdown-menu" style="width: 20%; left: 40%;color: #337ab7;"> <li *ngFor="let item of FacultyorStudent_Data; let i = index;" class="text-center" [ngClass]="{'bg-selected-quiz': selected_FacultyorStudent==item}" (click)="SelectFacultyorStudent(item)"> {{item}}</li> </ul> </div>

Answer 1

In your FacultyorStudent_Data array iterate it through loop, and match if item is equals to the item you want to remove. If they match then remove it using splice method.

In you.ts file:

for(let i=0;i<this.FacultyorStudent_Data.length;i++){
   if(FacultyorStudent_Data[i]=='yourItemName'){
     this.FacultyorStudent_Data.splice(i,1)
   }
}

Answer 2

 if (FnS == 'Student'){ this.FacultyorStudent_Data.splice(0,1,'Faculty | Coach Insights') } else{ this.FacultyorStudent_Data.splice(0,1,'Student') } }