Read a local file into a Javascript string
I needed to grab a local file and pull it into a Javascript string, I wanted to do this without any serverside support. I hack together the following short example, the same method can be used to pull in raw files for client-side processing:
<input type="file" id="files" name="files[]" multiple />
<output id="list"></output>
<script>
function handleFileSelect(evt) {
var files = evt.target.files; // FileList object
for (var i = 0, f; f = files[i]; i++) {
var reader = new FileReader();
// Closure to capture the file information.
reader.onload = (function(theFile) {
return function(e) {
var s = String.fromCharCode.apply(null, new Uint8Array(e.target.result));
document.write(s);
};
})(f);
// Read in the file as an ArrayBuffer
reader.readAsArrayBuffer(f);
}
}
document.getElementById('files').addEventListener('change', handleFileSelect, false);
</script>
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