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Here is how to use the readAsBinaryString() from the FileReader API to load a local file.
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<p>Select local CSV File:</p>
<input id="csv" type="file">
<output id="out">
file contents will appear here
</output>
Basically, just need to listen to change event in <input type="file"> and call the readFile function.
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var fileInput = document.getElementById("csv"),
readFile = function () {
var reader = new FileReader();
reader.onload = function () {
document.getElementById('out').innerHTML = reader.result;
};
// start reading the file. When it is done, calls the onload event defined above.
// reader.readAsBinaryString(fileInput.files[0]);
reader.readAsText(fileInput.files[0], 'utf8');
};
fileInput.addEventListener('change', readFile);
