Object is possibly null. TypeScript error (angular typescript)

Question

I want to add an image file to "convert" function.

this is my code from the component.html for the input:

<li>
    <label for="avatarIMG" id="avatarLbL"> image: </label>
    <input type="file" accept="image/*" #imageBox name="image" id="avatarinput" (change)="convert($event)">
    <button type="button" id="avatarInputBTN" (click)="imageBox.click()"> Profile Picture </button>
</li>

the event suppose to send the values of the object with all of the values + the image file from the form to the component.ts and this is the code of it:

public convert(e: Event): void {
    this.eventFiles = (e.target as HTMLInputElement).files[0];
    if (this.eventFiles !== null) {
        this.user.image = this.eventFiles;
        const fileReader = new FileReader();
        fileReader.onload = args => this.preview = args.target?.result?.toString();
        fileReader.readAsDataURL(this.eventFiles);
    }
}

i get an error of object possibly null for (e.target as HTMLInputElement).files[0].

how can i fix this?..

I don't use typescript, but probably you need to check e.target as HTMLInputElement != null or e.target is HTMLInputElement first. before access .files — apple apple
– apple apple, Commented Jan 5, 2021 at 14:44

ABOS · Accepted Answer · 2021-01-05 14:46:42Z

7

try this:

this.eventFiles = (e.target as HTMLInputElement)?.files?.[0];

answered Jan 5, 2021 at 14:46

ABOS

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