const MAX_BYTES = 10240; // 10KiB function enableDragDropForPGPKeys(inputID) { function drop(event) { event.stopPropagation(); event.preventDefault(); let files = event.dataTransfer.files; for (let i = 0; i < files.length; i++) { let file = files[i]; if(file.type !== 'text/plain'){ toastr.warning(`File ${file.name} is not a public key file`); continue; } let reader = new FileReader(); reader.onloadend = onFileLoaded; reader.readAsBinaryString(file); } } function onFileLoaded(event) { const initialData = event.currentTarget.result.substr(0, MAX_BYTES); $(inputID).val(initialData); } const dropArea = $(inputID).get(0); dropArea.addEventListener("drop", drop, false); }