FileReader: loadend event

loadend 이벤트는 성공여부와 관계없이 파일읽기가 끝나면 실행됩니다.

버블링 해당없음
이벤트 취소가능 해당없음
인터페이스 ProgressEvent
이벤트 핸들러 프로퍼티 FileReader.onloadend

예제

Live example

HTML

html
<div class="example">
  <div class="file-select">
    <label for="avatar">Choose a profile picture:</label>
    <input
      type="file"
      id="avatar"
      name="avatar"
      accept="image/png, image/jpeg" />
  </div>

  <img src="" class="preview" height="200" alt="Image preview..." />

  <div class="event-log">
    <label>Event log:</label>
    <textarea readonly class="event-log-contents"></textarea>
  </div>
</div>

JS

js
const fileInput = document.querySelector('input[type="file"]');
const preview = document.querySelector("img.preview");
const eventLog = document.querySelector(".event-log-contents");
const reader = new FileReader();

function handleEvent(event) {
  eventLog.textContent =
    eventLog.textContent + `${event.type}: ${event.loaded} bytes transferred\n`;

  if (event.type === "load") {
    preview.src = reader.result;
  }
}

function addListeners(reader) {
  reader.addEventListener("loadstart", handleEvent);
  reader.addEventListener("load", handleEvent);
  reader.addEventListener("loadend", handleEvent);
  reader.addEventListener("progress", handleEvent);
  reader.addEventListener("error", handleEvent);
  reader.addEventListener("abort", handleEvent);
}

function handleSelected(e) {
  eventLog.textContent = "";
  const selectedFile = fileInput.files[0];
  if (selectedFile) {
    addListeners(reader);
    reader.readAsDataURL(selectedFile);
  }
}

fileInput.addEventListener("change", handleSelected);

결과

명세

Specification
File API
# dfn-loadend-event
File API
# dfn-onloadend

브라우저 호환성

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See also