Angular:如何在Angular中添加/删除文件? [英] Angular : How to Add/Remove Files in the Angular?

问题描述

在这里我选择多个图像并使用*ngFor进行显示，然后在其中放置了一个删除按钮，该按钮显示在屏幕快照中，单击删除"按钮我想从所选列表中删除所选图像，我尝试了以下代码，但没有适当的解决方案.

Here i choose multiple images and shows using *ngFor And there I have placed a delete button which is appear in the screenshot, click on delete button i want to delete chosen image from chosen list i tried below code but i not getting proper solution.

add.component.html

add.component.html

<button mat-raised-button (click)="fileInput.click()">Select File</button>

<input style="display: none" type="file" (change)="onFileChanged($event)" #fileInput multiple="true">

<div *ngFor="let selected of selectedFile;let index = index">
  <h3>{{selected.name}}</h3>
  <button mat-icon-button (click)="removeSelectedFile(index)">delete</button>
</div>

add.component.ts

add.component.ts

selectedFile: File;
ArrayOfSelectedFile = new Array<string>();

onFileChanged(event : any) {
  this.ArrayOfSelectedFile= [];
  this.selectedFile = event.target.files;
  this.ArrayOfSelectedFile.push(event.target.files);
}

removeSelectedFile(index){
  this.ArrayOfSelectedFile.splice(index,1);
}

推荐答案

HTML代码:

<button mat-raised-button (click)="fileInput.click()">Select File</button>

<input style="display: none"  #attachments type="file" (change)="onFileChanged($event)" #fileInput multiple="true">

<div *ngFor="let selected of listOfFiles;let index = index">
  <h3>{{selected}}</h3>
  <button mat-icon-button (click)="removeSelectedFile(index)">delete</button>
</div>

和TS代码:

导入此:

import { Component, OnInit, Inject, ViewChild } from '@angular/core';

在组件类内部:

@ViewChild('attachments') attachment: any;

selectedFile: File;
fileList: File[] = [];
listOfFiles: any[] = [];

onFileChanged(event: any) {
    for (var i = 0; i <= event.target.files.length - 1; i++) {
      var selectedFile = event.target.files[i];
      this.fileList.push(selectedFile);
      this.listOfFiles.push(selectedFile.name)
  }

  this.attachment.nativeElement.value = '';
}



removeSelectedFile(index) {
 // Delete the item from fileNames list
 this.listOfFiles.splice(index, 1);
 // delete file from FileList
 this.fileList.splice(index, 1);
}

如果由于我已经使用@ViewChild重设了value = ''而发现已删除的文件无法再次上传，则可以再次选择已删除的文件.

If you notice that the Deleted file is not available for upload again for that I have used @ViewChild to reset the value = '', then you can select the deleted file again.

这是一个有效的 StackBlitz 示例.

Here is a working StackBlitz example.

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