open a file in javascript code example

Example 1: javascript function to open file browser

const browseFiles = () => {
  var input = document.createElement('input');
  input.type = 'file';
  input.click();
}

Example 2: how to read a file in javascript

fetch('file.txt')
  .then(response => response.text())
  .then(text => console.log(text))
  // outputs the content of the text file

Example 3: javascript how to open a file

function readSingleFile(e) {
  var file = e.target.files[0];
  if (!file) {
    return;
  }
  var reader = new FileReader();
  reader.onload = function(e) {
    var contents = e.target.result;
    displayContents(contents);
  };
  reader.readAsText(file);
}

function displayContents(contents) {
  var element = document.getElementById('file-content');
  element.textContent = contents;
}

document.getElementById('file-input')
  .addEventListener('change', readSingleFile, false);

Example 4: javascript how to open a file

window.open("file:///D:/Hello.txt");