<div class="fileUpload btn btn-primary">
<span>Select File</span>
<input id="uploadBtn" type="file" class="upload" value="No File Chosen" #uploadBtn/>
</div>
<input id="uploadFile" placeholder="No File Selected" disabled="disabled" value="{{uploadBtn.value}}"/>
What is the best way to retrieve and access the uploaded file in both Angular and TypeScript? I also need to perform additional tasks such as validation for correct file formats. Any advice on how to achieve this?
The process is quite similar to how it would be done in JavaScript.
If you are using the following template for a component named FileUploadComponent, you can implement it like this. Remember, this involves HTML5, so browser support starts from IE10.
@Component({
selector: 'file-upload',
template: `
...
<input type="file" class="upload" (change)="_onChange($event.target.files)">
...`
})
export class FileUploadComponent {
private _onChange(files: FileList) : void {
if(files && files.length > 0) {
let file : File = files.item(0);
//You can now access
console.log(file.name);
console.log(file.size);
console.log(file.type);
}
}
}
You can enhance this functionality by utilizing the FileReader to load the file.
If you wish to read a csv file, you can start with the following:
Creating a new FileReader:
let reader: FileReader = new FileReader();
reader.onload = (e) => {
let csv: string = reader.result;
console.log(csv);
//At this point, you can either use a CSV parsing library or your custom implementation based on the CSV structure
}
reader.readAsText(file);
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