angular - 类型 'result' 上不存在属性 'EventTarget'

Question

我收到以下关于事件类型的错误。错误:类型“EventTarget”上不存在属性“结果”。

我的.ts文件，

select4File(event) {
    if (event.target.files && event.target.files[0]) {
        var reader = new FileReader();

        reader.readAsDataURL(event.target.files[0]); // read file as data url

        reader.onload = (event) => { // called once readAsDataURL is completed
            this.imageurl2 = event.target.result;


        }
        this.selectedfiles = event.target.files;
    }

}

my html,
 <div class="form-inline" Style="color: black">
          <div class="row">
          <div class="col-md-6 offset-md-3">
            <label style ="color: black">Additional ID Back</label>
            <form >
          <div class="form-inline" >
              <img [src]="imageurl2" height="200"> <br/>
            <input type="file"(change)="select4File($event)"  />
          </div>
            </form>
          </div>
          </div>
            &nbsp; &nbsp;
            <button (click)="uploadADIDback()" class="btn btn-primary" style="margin:0 35%;position:relative;left:-35px;background-color: #3560a5;  /* blue */">Upload</button>
          </div>
          </div>

请在此处帮助解决此错误。

Answer 1

试试这个:

  reader.onload = () => {
    // called once readAsDataURL is completed
    this.imageurl2 = reader.result;
  };