从下拉列表中获取所选选项的值答案

【问题标题】：get the value of the selected option from the drop down从下拉列表中获取所选选项的值
【发布时间】：2020-04-30 04:40:30
【问题描述】：

我是 Angular 的新手。我有一个引导下拉菜单，我需要从该下拉菜单中获取所选选项的值。提前致谢。

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

  <div class="text-center" id="perf-type">
    <div class="dropdown-toggle" data-toggle="dropdown">{{selected_FacultyorStudent}}&nbsp; Insights<i
        class="fa fa-caret-down"></i>
    </div>
    <ul class="dropdown-menu">
      <li *ngFor="let item of FacultyorStudent_Data; let i = index;"
        [ngClass]="{'bg-selected-subject': selected_FacultyorStudent==item}"
        (click)="SelectFacultyorStudent(FnS)">
        {{item}}</li>

    </ul>
  </div>

【问题讨论】：

标签： javascript angular

【解决方案1】：

将item 作为SelectFacultyorStudent 的参数传递，例如(click)="SelectFacultyorStudent(item)

【讨论】：

【解决方案2】：

在 html 文件中传递 item 而不是 fns

<div class="text-center" id="perf-type">
        <div class="dropdown-toggle" data-toggle="dropdown">{{selected_FacultyorStudent}}&nbsp; Insights<i
            class="fa fa-caret-down"></i>
        </div>
        <ul class="dropdown-menu">
          <li *ngFor="let item of FacultyorStudent_Data; let i = index;"
            [ngClass]="{'bg-selected-subject': selected_FacultyorStudent==item}"
            (click)="SelectFacultyorStudent(item)">
            {{item}}</li>
        </ul>
      </div>


FacultyorStudent_Data: Array<string> = ['Faculty/Coach','Student']
  selected_FacultyorStudent: string = this.FacultyorStudent_Data[0];

  SelectFacultyorStudent(FnS){

    console.log(FnS)
  }

【讨论】：

【解决方案3】：

试试这个。我从您的 HTML 中传递了 item 而不是 FnS。并接收到 TS 文件中的值并将该值赋给 selected_FacultyorStudent 这个变量。

 <div class="text-center" id="perf-type">
<div class="dropdown-toggle" data-toggle="dropdown">{{selected_FacultyorStudent}}&nbsp; Insights<i
    class="fa fa-caret-down"></i>
</div>
<ul class="dropdown-menu">
  <li *ngFor="let item of FacultyorStudent_Data; let i = index;"
    [ngClass]="{'bg-selected-subject': selected_FacultyorStudent==item}"
    (click)="SelectFacultyorStudent(item)">
    {{item}}</li>

</ul>

  FacultyorStudent_Data: Array<string> = ['Faculty/Coach','Student']
  selected_FacultyorStudent: string = this.FacultyorStudent_Data[0];

  SelectFacultyorStudent(FnS){
   this.selected_FacultyorStudent = FnS;
    console.log(FnS)
  }

【讨论】：