Vue convert image into base64

Question

I want to convert an local image to base64. The reader.readAsDataURL does not work. I always get an undefined for the rawImg var. The value for the file var, are the metadata from the file I try to upload.

HTML:

<input
  type="file"
  accept="image/jpeg/*"
  @change="uploadImage()"
/>

JS:

uploadImage() {
  const file = document.querySelector('input[type=file]').files[0]
  const reader = new FileReader()

  const rawImg = reader.readAsDataURL(file)
  console.log(file)
  console.log(rawImg)
}

`.readAsDataURL` is asynchronous – Bravo Dec 15 '20 at 21:08 — Bravo, Dec 15 '20 at 21:08
tip: loop `[0]` walla.. multi-file uploads – Lawrence Cherone Dec 15 '20 at 21:14 — Lawrence Cherone, Dec 15 '20 at 21:14

Dan · Accepted Answer · 2023-06-08T18:48:38.850

7

It won't work if you set the image directly from readAsDataURL, which returns undefined always. Instead, use the onloadend event:

let rawImg;
const file = document.querySelector('input[type=file]').files[0];
const reader = new FileReader();

reader.onloadend = () => {
   rawImg = reader.result;
   console.log(rawImg);
}
reader.readAsDataURL(file);

edited Jun 08 '23 at 18:48

answered Dec 15 '20 at 21:06

Dan

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Vue convert image into base64

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