How do I edit a file in pure js (without node)? I get a file with an input field and I read its text like this:
var fileReader = new FileReader();
fileReader.readAsText(file);
fileReader.onload = function () {
alert(this.result);
}
So, pretty straight forward. I tried to look on the net how to use a fileWriter but with no success. I just need to edit the text inside that file and save it, how can I do?
You can read in the data in the text file, modify it in client side JavaScript (no Node), and then output and re-save it. It does require user interaction, though.
Originally taken from this Stackoverflow question
(function () {
var textFile = null;
function makeTextFile(text) {
var data = new Blob([text], {type: 'text/plain'});
// If we are replacing a previously generated file we need to
// manually revoke the object URL to avoid memory leaks.
if (textFile !== null) {
window.URL.revokeObjectURL(textFile);
}
textFile = window.URL.createObjectURL(data);
return textFile;
}
var create = document.getElementById('create');
var textbox = document.getElementById('textbox');
//create a click event listener
create.addEventListener('click', function () {
var link = document.getElementById('downloadlink');
link.setAttribute('download', 'info.txt');
//make the text file
link.href = makeTextFile(textbox.value);
link.style.display = 'block';
//wait for the link to be rendered and then initiate a click to download the file
window.requestAnimationFrame(function () {
var event = new MouseEvent('click');
link.dispatchEvent(event);
document.body.removeChild(link);
});
}, false);
})();
You can't write files in a browser, you'll have to use node.
