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// 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);
});
},
);
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