file Input Event type in Angular

Question

So I have been using Angular and Typescript for a long time. I cannot seem to find out what the Type for an Input file is.

For example:

<input type="file" (change)="fileChangeEvent($event)">

fileChangeEvent(e:?????){}

All examples purely just uses event without any type, and I am curious to know if such a type even exists.

Answer 1

For Angular 10 strict-type mode, we need to mention type in parameters. You can follow this way to achieve file-list from file input event

// HTML
<input type="file" (change)="uploadFile($event)">

// TS
uploadFile(event: Event) {
    const element = event.currentTarget as HTMLInputElement;
    let fileList: FileList | null = element.files;
    if (fileList) {
      console.log("FileUpload -> files", fileList);
    }
}

Hope this helps. Please share your feedback.

Answer 2

Use File

The File interface provides information about files and allows JavaScript in a web page to access their content.

Try this

component.html

<input type="file" (change)="fileChangeEvent($event.target.files)">

component.ts

fileChangeEvent(e: File[]){
    fileName = e[0];
    fileType = fileName.type;
}

Answer 3

Angular 10 and above:

component.html

    <input type="file" (change)="upload($event)">

component.ts

  upload(event: Event) {
      const target = event.target as HTMLInputElement;
      const files = target.files as FileList;
      console.log(files);
  }