Reading Blobs in IE11

Question

I used this article to read a CSV file using JavaScript. The code below works fine in Chrome and Firefox, but IE 11 throws the following error:

Object doesn't support property or method 'readAsBinaryString'

when calling:

reader.readAsBinaryString(blob);

According to this MSDN article, however, readAsBinaryString is a method supported by FileReader. Am I missing something / is there a different way of reading files in IE 11?

HTML code:

<table>
    <tr>
        <td>Import CSV File</td>
        <td><input type="file" id="files" name="file"/></td>
    </tr>
</table>       
<button id="read" href="#">Read</button>

JS code:

//read a file
function readBlob() {

var files = document.getElementById('files').files;

if (!files.length) {
    alert('Please select a file!');
    return;
}

var file = files[0];
var start = 0;
var stop = file.size - 1;
var reader = new FileReader();

// If we use onloadend, we need to check the readyState.
reader.onloadend = function(evt) {
    if (evt.target.readyState == FileReader.DONE) { // DONE == 2
        makeJSON(evt.target.result);
    }
};

var blob = file.slice(start, stop + 1);
reader.readAsBinaryString(blob);

}

score 6 · Accepted Answer · answered Aug 25 '15 at 20:56

FileReader also supports readAsText method, which can be used to read a File or Blob object into memory as a text string across all three browsers (Chrome, FF, and IE11).

Replacing reader.readAsBinaryString(blob) with reader.readAsText(blob) fixed the problem.

score 0 · Answer 2 · edited May 23 '17 at 12:00

0

maybe you can use this:

var binary = "";
var bytes = new Uint8Array(buffer);
var length = bytes.byteLength;
for (var i = 0; i < length; i++) {
  binary += String.fromCharCode(bytes[i]);
}

Reference : Link

edited May 23 '17 at 12:00

Community

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answered Aug 25 '15 at 20:33

kamus

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Reading Blobs in IE11

2 Answers2