从文件 url 获取扩展名

Question

I am using file(input) to select a file. I want to retrieve the file extension(.jpeg) from a URL C:\Users\Rajat\Pictures\pic1.jpeg . Then after that I want to put the URL into a text box according to their format ie audio, video and image.

Answer 1

Try this:

var url='C:\Users\Rajat\Pictures\pic1.jpeg';
var parts=url.split('.');
console.log(parts[parts.length-1]);

Answer 2

In that case you better go with mimetype instead of extensions.

var fileInput = document.getElementById('your-file-input-id');
var fileType = fileInput.files[0].type;
console.log(fileType);//gives image/jpeg or audio/mp3
var parts = filetype.split('/');
parts[0];//image
parts[1];//jpeg

Answer 3

Using ES2022's Array.at() method (see link for browser support), you can do it in a one liner like so:

 const url = "https://example.com/my-file.jpg"; const extension = url.split(".")?.at(-1); console.log(extension);