Is it possible to insert an image without using a filepath src?

Question

Assume that I have an image stored as a variable, from a form, in the form of var someImage = document.getElementById("input1").files[0]. How would I insert this image saved to a variable into an HTML document, without using filepaths?

[Preview an image before it is uploaded](https://stackoverflow.com/questions/4459379/preview-an-image-before-it-is-uploaded) ? — Alex K., Jun 22 '18 at 13:33

score 1 · Accepted Answer · answered Jun 22 '18 at 13:42

1

Yes, see FileReader.readAsDataURL(): read file as data URI.

document.getElementById("input1").onchange = function(e) {
  var someImage = e.target.files[0]
  var reader = new FileReader();
  var img = document.getElementById('preview');
  reader.onload=function(){
    img.src = reader.result
  }
  reader.readAsDataURL(someImage)
}

<input type="file" id="input1" accept="image/*" />
<img id="preview" src="" />

answered Jun 22 '18 at 13:42

joaner

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Perhaps this is a local problem, but when I save your code as an HTML file and then open it from my computer the image does not load. I'm using Firefox (up to date) on an Ubuntu. – DevilApple227 Jun 22 '18 at 13:55
@DevilApple227 code is no porblem on firefox. Can you see any message from browser Console? It's easy to debug. – joaner Jun 22 '18 at 14:01
TypeError: document.getElementById(...) is null – DevilApple227 Jun 22 '18 at 14:52
@DevilApple227 emmm... you should change your element id or something, my code only work for simple example. – joaner Jun 22 '18 at 14:56
In what sense? Perhaps I'm wrong, but I thought element ids were arbitrary strings, in the sense that it doesn't matter what you set them to? – DevilApple227 Jun 22 '18 at 15:03
sorry I have no idea, you need to debug yourself. – joaner Jun 22 '18 at 15:06

Is it possible to insert an image without using a filepath src?

1 Answers1