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How to read and write into file using JavaScript
can anybody provide sample code to read and write into file using javascript?
at present i am trying to read input from json file and display it in textboxes providing the user flexibility to edit the data. Edited data has to be written into json file.
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here is the sample html file, i have tested it with firefox working fine.
<!DOCTYPE html>
<html>
<head>
<script>
function handleFileSelect()
{
if (window.File && window.FileReader && window.FileList && window.Blob) {
} else {
alert('The File APIs are not fully supported in this browser.');
return;
}
input = document.getElementById('fileinput');
if (!input) {
alert("Um, couldn't find the fileinput element.");
}
else if (!input.files) {
alert("This browser doesn't seem to support the `files` property of file inputs.");
}
else if (!input.files[0]) {
alert("Please select a file before clicking 'Load'");
}
else {
file = input.files[0];
fr = new FileReader();
fr.onload = receivedText;
fr.readAsText(file);
}
}
function receivedText() {
//result = fr.result;
document.getElementById('editor').appendChild(document.createTextNode(fr.result))
}
</script>
</head>
<body>
<input type="file" id="fileinput"/>
<input type='button' id='btnLoad' value='Load' onclick='handleFileSelect();'>
<div id="editor"></div>
</body>
</html>
JavaScript running in a web page displayed in a browser cannot access the client file system.
But you can use API's
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