I have implemented a Material file selection feature in my project. The code snippet below shows how I am doing it:
<label for="uploadPicture" class="upload-file">
<mat-icon>add_a_photo</mat-icon>
</label>
<input type="file"
id="uploadPicture"
class="hidden-input"
accept="text/kml, .kml"
(change)="selectFile($event.target.files[0])">
<button mat-button (click)="onCancel()">Cancel</button>
<button mat-button (click)="onOk()" [disabled]="!selected">Ok</button>
So far, the file selection functionality is working smoothly and the 'selectFile' method is being triggered as expected.
However, the next challenge I am facing is how to proceed after selecting the file. I need to read this selected file and parse it as an XML file.
The file object being used here belongs to the Typescript File interface, which is defined in lib.dom.d.ts as follows:
interface File extends Blob {
readonly lastModifiedDate: any;
readonly name: string;
readonly webkitRelativePath: string;
}
Despite searching for documentation on this particular class, I have not been able to find any relevant information. It seems that most resources focus on using node or JavaScript methods for file operations rather than Typescript approaches.
Update:
After some experimentation, I managed to come up with the following code snippet to handle reading the selected file:
const fileReader = new FileReader();
let text: string;
fileReader.onload = e => {
text = fileReader.result;
console.log('result', text);
};
fileReader.readAsText(file);