/* Any JavaScript here will be loaded for all users on every page load. */
function FillUploadForm() {
if(document.getElementById('wpDestFile').value == "") {
uploadDesc = document.getElementById('wpUploadDescription');
uploadDesc.innerHTML = wgCanonicalSpecialPageName + "{{Information
|Description=
|Source=
|Date=
|Author=
|Permission=
|other_versions=
}}";
}
}
addOnloadHook( FillUploadForm );
<!-- wgCanonicalSpecialPageName == "" &&  -->