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Read Local Files in JavaScript with FileReader – onlinecode

Read Local Files in JavaScript with FileReader

In this post, we will give you information about Read Local Files in JavaScript with FileReader – onlinecode. Here we will give you detail about Read Local Files in JavaScript with FileReader – onlinecode And how to use it also give you a demo for it if it is necessary.

JavaScript’s FileReader is a class that enables you to read a file on the user’s
machine from JavaScript running in the browser. FileReader is typically
used to read data from an <input type="file">.

For example, suppose you have a file input on your page with id select-file.
Here’s how you can print out the contents of the currently selected file.

const file = document.querySelector('#select-file').files[0];
const reader = new FileReader();

reader.onload = res => {
  console.log(res.target.result); // Print file contents
};
reader.onerror = err => console.log(err);

reader.readAsText(file);

Below is a live example that prints file contents to the console
every time you select a different file. Click Ctrl+Shift+J on Linux/Windows
or Cmd+J on OSX to open up the Chrome console and try it out!

FileReader is well supported in modern browsers, as well as IE10.
Note that FileReader is a browser API, so, while most browsers
support it, FileReader is not part of Node.js.

With Promises and Async/Await

The FileReader class’ async API isn’t ideal for usage with async/await or promise chaining. Here’s how you can wrap a FileReader
in a promise for chaining:

function readFile(file) {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();

    reader.onload = res => {
      resolve(res.target.result);
    };
    reader.onerror = err => reject(err);

    reader.readAsText(file);
  });
}

With the above readFile() helper, you can read a file in an async
function:

async function onSubmit() {
  const file = document.querySelector('#select-file').files[0];

  const contents = await readFile(file);
}

 

JavaScript Fundamentals

JavaScript is a programming language that is used to create interactive web pages. It is a client-side scripting language, which means that it runs on the user’s browser. JavaScript can be used to add animation, interactivity, and functionality to web pages.

Here are some of the fundamentals of JavaScript:

These are just some of the fundamentals of JavaScript. There are many other concepts that you can learn as you continue to develop your skills.

Here are some resources that you can use to learn more about JavaScript:

I hope this helps!

Here are some additional tips for learning JavaScript:

With a little practice, you’ll be able to learn JavaScript and start building amazing web applications.

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