Event for browse button for fileupload control

Question

I'm creating an application, where I need to check which file is choosen for the file-upload. Depending on the file upload, 2 other fields will be filled in because the filename is concerning a certain standard.
Can I do this with javascript for example without needing to post my page.
Any help would be most welcome

Answer 1

You can do this with javascript.
var fileName = document.getElementById('fileUploadComponentId').value;
if (fileName.substring(fileName.indexOf('.' + 1)) == 'ext') {
    // the extension is "ext".
} else {
    // the extension is not "ext".
}