I'm currently working with TypeScript and facing an issue with a file upload form. However, when I try to access the files from the input element in my TypeScript code, an error is generated.
$('body').on('change', '#upload_button input[type="file"]', (evt)=>{
let file_list = evt.target.files;
});
The specific error received is:
Property 'files' does not exist on type 'Element'
Is there a way to resolve this error and properly access the file list?
Keep in mind that the $(...) function will always give you a list of elements. To get the first (and unique) element, use [0], and then convert it to an HTMLInputElement.
$('body').find('#upload_button input[type="file"]')
.on('change', (evt: JQuery.TriggeredEvent) => {
let input = <HTMLInputElement>$(evt.currentTarget)[0];
let file_list = input.files;
//...
});
Remember that files is a property of HTMLInputElement
If you're working with typescript, remember that `file` is not a method of the HTMLElement type. Consider changing the element type to HTMLInputElement.
Check out this example:
let inputFile: HTMLInputElement = <HTMLInputElement>document.getElementById('input');To overcome the issue of
Property 'files' does not exist on type 'Element'$('body').on('change', '#upload_button input[type="file"]', (event)=>{
event.preventDefault()
const fileInput: HTMLInputElement = <HTMLInputElement>document.querySelector(event.currentTarget);
const selectedFile = fileInput.files[0];
...
});
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