Is there a recommended method to validate the file type when uploading a file in an Angular 4 form? Are there any simple ways to accomplish this task?
Is there a recommended method to validate the file type when uploading a file in an Angular 4 form? Are there any simple ways to accomplish this task?
A client-side validation feature is available.
Here is a simple illustration:
upload(event: any) {
let files = event.target.files;
//checking the validity of the file
if (!this.validateFile(files[0].name)) {
console.log('The selected file format is not supported');
return false;
}
let fData: FormData = new FormData;
for (var i = 0; i < files.length; i++) {
fData.append("file", files[i]);
}
var _data = {
filename: 'Sample File',
id: '0001'
}
fData.append("data", JSON.stringify(_data));
this._service.uploadFile(fData).subscribe(
response => console.log(response),
error => console.log(error)
)
}
Validation process:
validateFile(name: String) {
var ext = name.substring(name.lastIndexOf('.') + 1);
if (ext.toLowerCase() == 'war') {
return true;
}
else {
return false;
}
}
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