Kevin FEDYNA
112 lines
3.2 KiB
TypeScript
112 lines
3.2 KiB
TypeScript
// @deno-types="https://cdn.sheetjs.com/xlsx-0.20.3/package/types/index.d.ts"
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import * as XLSX from "https://cdn.sheetjs.com/xlsx-0.20.3/package/xlsx.mjs";
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import { Signal, useSignal } from "@preact/signals";
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/**
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* Create a new handler for file change that displays
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* messages in statusMessage and gets file data in fileData.
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* @param statusMessage The status message signal.
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* @param fileData The file data signal.
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* @returns The file change handler.
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*/
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function getFileChangeHandler(
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statusMessage: Signal<string>,
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fileData: Signal<File | null>,
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): (event: Event) => void {
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/**
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* Handle file change.
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* @param event The file change event.
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*/
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return (event: Event) => {
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const input = event.target as HTMLInputElement;
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if (input.files && input.files.length > 0) {
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fileData.value = input.files[0];
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statusMessage.value = `File selected: ${input.files[0].name}`;
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} else {
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fileData.value = null;
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statusMessage.value = "No file selected";
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}
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};
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}
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/**
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* Create a new handler that sends data file to server.
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* @param statusMessage The status message signal.
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* @param fileData The file data signal.
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* @returns The file confirmation handler.
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*/
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function getUploadConfirmationFunction(
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statusMessage: Signal<string>,
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fileData: Signal<File | null>,
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): () => void {
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/**
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* Add students to database.
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* @returns Confirm upload of students.
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*/
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return () => {
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if (!fileData.value) {
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statusMessage.value = "Please select a file before confirming upload.";
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return;
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}
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const reader = new FileReader();
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/**
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* Send all data to the server.
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* @param event The finished progress event.
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*/
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reader.onload = async (event: ProgressEvent<FileReader>) => {
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const arrayBuffer = event.target!.result as ArrayBuffer;
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const workbook = XLSX.read(arrayBuffer, { type: "array" });
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let allOK = true;
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for (const sheetName of workbook.SheetNames) {
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const sheet = workbook.Sheets[sheetName];
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const data = XLSX.utils.sheet_to_json(sheet, {
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header: ["userId", "lastName", "firstName", "mail"],
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range: 1,
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});
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const response = await fetch("/students/api/students", {
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method: "POST",
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headers: { "Content-Type": "application/json" },
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body: JSON.stringify({ promoName: sheetName, data }),
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});
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if (!response.ok) {
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allOK = false;
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}
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}
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statusMessage.value = allOK
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? "Failed to insert all data."
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: "Data uploaded and inserted successfully!";
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};
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/**
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* Display error message if any.
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*/
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reader.onerror = () => {
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statusMessage.value = "Error reading the file.";
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};
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reader.readAsArrayBuffer(fileData.value);
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};
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}
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export default function UploadStudents() {
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const statusMessage = useSignal<string>("");
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const fileData = useSignal<File | null>(null);
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const handleFileChange = getFileChangeHandler(statusMessage, fileData);
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const confirmUpload = getUploadConfirmationFunction(statusMessage, fileData);
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return (
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<>
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<input type="file" accept=".xlsx, .xls" onChange={handleFileChange} />
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<button onClick={confirmUpload}>Confirm Upload</button>
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<p>{statusMessage.value}</p>
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</>
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);
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}
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