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Error message "DevTools failed to load SourceMap: Could not load content for chrome-extension://..."

I'm trying to display an image selected from the local machine and I need the location of that image for a JavaScript function. But I'm unable to get the location.

To get the image location, I tried using console.log, but nothing returns.

console.log(document.getElementById("uploadPreview"));

Here's the HTML code:

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>

<body>
  <div align="center" style="padding-top: 50px">
    <img align="center" id="uploadPreview" style="width: 100px; height: 100px;" />
  </div>

  <div align="center" style="padding-left: 30px">
    <input id="uploadImage" type="file" name="myPhoto" onchange="PreviewImage();" />
  </div>

  <script type="text/javascript">
    function PreviewImage() {
      var oFReader = new FileReader();
      oFReader.readAsDataURL(document.getElementById("uploadImage").files[0]);

      oFReader.onload = function (oFREvent) {
        document.getElementById("uploadPreview").src = oFREvent.target.result;
        console.log(document.getElementById("uploadPreview").src);

      };
    }
  </script>

</body>
</html>

Console Output:

Enter image description here

Here's the warning:

DevTools failed to load SourceMap: Could not load content for chrome-extension://alplpnakfeabeiebipdmaenpmbgknjce/include.preload.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME

about 3 years ago · Santiago Trujillo
3 answers
Answer question

0

That's because Chrome added support for source maps.

Go to the developer tools (F12 in the browser), then select the three dots in the upper right corner, and go to Settings.

Then, look for Sources, and disable the options:

  • "Enable JavaScript source maps"
  • "Enable CSS source maps"

If you do that, that would get rid of the warnings. It has nothing to do with your code. Check the developer tools in other pages and you will see the same warning.

about 3 years ago · Santiago Trujillo Report

0

Go to Developer tools → Settings → Console → tick "Selected context only". The warnings will be hidden. You can see them again by unticking the same box.

The "Selected context only" means only the top, iframe, worker and extension contexts. Which is all that you'll need, the vast majority of the time.

about 3 years ago · Santiago Trujillo Report

0

The include.prepload.js file will have a line like below, probably as the last line:

//# sourceMappingURL=include.prepload.js.map

Delete it and the error will go away.

about 3 years ago · Santiago Trujillo Report
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