// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license. import { assertEquals } from "./test_util.ts"; Deno.test(function fileReaderConstruct() { const fr = new FileReader(); assertEquals(fr.readyState, FileReader.EMPTY); assertEquals(FileReader.EMPTY, 0); assertEquals(FileReader.LOADING, 1); assertEquals(FileReader.DONE, 2); }); Deno.test(async function fileReaderLoadBlob() { await new Promise<void>((resolve) => { const fr = new FileReader(); const b1 = new Blob(["Hello World"]); assertEquals(fr.readyState, FileReader.EMPTY); const hasOnEvents = { load: false, loadend: false, loadstart: false, progress: 0, }; const hasDispatchedEvents = { load: false, loadend: false, loadstart: false, progress: 0, }; let result: string | null = null; fr.addEventListener("load", () => { hasDispatchedEvents.load = true; }); fr.addEventListener("loadend", () => { hasDispatchedEvents.loadend = true; }); fr.addEventListener("loadstart", () => { hasDispatchedEvents.loadstart = true; }); fr.addEventListener("progress", () => { hasDispatchedEvents.progress += 1; }); fr.onloadstart = () => { hasOnEvents.loadstart = true; }; fr.onprogress = () => { assertEquals(fr.readyState, FileReader.LOADING); hasOnEvents.progress += 1; }; fr.onload = () => { hasOnEvents.load = true; }; fr.onloadend = (ev) => { hasOnEvents.loadend = true; result = fr.result as string; assertEquals(hasOnEvents.loadstart, true); assertEquals(hasDispatchedEvents.loadstart, true); assertEquals(hasOnEvents.load, true); assertEquals(hasDispatchedEvents.load, true); assertEquals(hasOnEvents.loadend, true); assertEquals(hasDispatchedEvents.loadend, true); assertEquals(fr.readyState, FileReader.DONE); assertEquals(result, "Hello World"); assertEquals(ev.lengthComputable, true); resolve(); }; fr.readAsText(b1); }); }); Deno.test(async function fileReaderLoadBlobDouble() { // impl note from https://w3c.github.io/FileAPI/ // Event handler for the load or error events could have started another load, // if that happens the loadend event for the first load is not fired const fr = new FileReader(); const b1 = new Blob(["First load"]); const b2 = new Blob(["Second load"]); await new Promise<void>((resolve) => { let result: string | null = null; fr.onload = () => { result = fr.result as string; assertEquals(result === "First load" || result === "Second load", true); if (result === "First load") { fr.readAsText(b2); } }; fr.onloadend = () => { assertEquals(result, "Second load"); resolve(); }; fr.readAsText(b1); }); }); Deno.test(async function fileReaderLoadBlobArrayBuffer() { await new Promise<void>((resolve) => { const fr = new FileReader(); const b1 = new Blob(["Hello World"]); let result: ArrayBuffer | null = null; fr.onloadend = (ev) => { assertEquals(fr.result instanceof ArrayBuffer, true); result = fr.result as ArrayBuffer; const decoder = new TextDecoder(); const text = decoder.decode(result); assertEquals(text, "Hello World"); assertEquals(ev.lengthComputable, true); resolve(); }; fr.readAsArrayBuffer(b1); }); }); Deno.test(async function fileReaderLoadBlobDataUrl() { await new Promise<void>((resolve) => { const fr = new FileReader(); const b1 = new Blob(["Hello World"]); let result: string | null = null; fr.onloadend = (ev) => { result = fr.result as string; assertEquals( result, "data:application/octet-stream;base64,SGVsbG8gV29ybGQ=", ); assertEquals(ev.lengthComputable, true); resolve(); }; fr.readAsDataURL(b1); }); }); Deno.test(async function fileReaderLoadBlobAbort() { await new Promise<void>((resolve) => { const fr = new FileReader(); const b1 = new Blob(["Hello World"]); const hasOnEvents = { load: false, loadend: false, abort: false, }; fr.onload = () => { hasOnEvents.load = true; }; fr.onloadend = (ev) => { hasOnEvents.loadend = true; assertEquals(hasOnEvents.load, false); assertEquals(hasOnEvents.loadend, true); assertEquals(hasOnEvents.abort, true); assertEquals(fr.readyState, FileReader.DONE); assertEquals(fr.result, null); assertEquals(ev.lengthComputable, false); resolve(); }; fr.onabort = () => { hasOnEvents.abort = true; }; fr.readAsDataURL(b1); fr.abort(); }); }); Deno.test(async function fileReaderLoadBlobAbort() { await new Promise<void>((resolve) => { const fr = new FileReader(); const b1 = new Blob(["Hello World"]); const hasOnEvents = { load: false, loadend: false, abort: false, }; fr.onload = () => { hasOnEvents.load = true; }; fr.onloadend = (ev) => { hasOnEvents.loadend = true; assertEquals(hasOnEvents.load, false); assertEquals(hasOnEvents.loadend, true); assertEquals(hasOnEvents.abort, true); assertEquals(fr.readyState, FileReader.DONE); assertEquals(fr.result, null); assertEquals(ev.lengthComputable, false); resolve(); }; fr.onabort = () => { hasOnEvents.abort = true; }; fr.readAsDataURL(b1); fr.abort(); }); }); Deno.test( async function fileReaderDispatchesEventsInCorrectOrder() { await new Promise<void>((resolve) => { const fr = new FileReader(); const b1 = new Blob(["Hello World"]); let out = ""; fr.addEventListener("loadend", () => { out += "1"; }); fr.onloadend = (_ev) => { out += "2"; }; fr.addEventListener("loadend", () => { assertEquals(out, "12"); resolve(); }); fr.readAsDataURL(b1); }); }, );