How Can I Read a Text File into a JavaScript Variable?

How to Read Text File Content into a JavaScript Variable

A common task in JavaScript applications is loading the contents of text files into variables. To achieve this, developers often turn to XMLHttpRequest (AJAX), which allows communication with a server without page refresh.

XMLHttpRequest for Text File Loading

Using XMLHttpRequest, you can send a GET request to the text file and receive its contents as a response. Here's an example:

var client = new XMLHttpRequest();
client.open('GET', '/foo.txt');
client.onreadystatechange = function() {
  console.log(client.responseText);
}
client.send();

This code opens a GET request to the text file, sets up an event listener for the readystatechange event, and sends the request. The event listener will be triggered when the request completes, and the response text can be obtained from client.responseText.

Framework Consideration

However, XMLHttpRequest may not be available in all JavaScript frameworks. Therefore, using a framework like jQuery can simplifies the process:

$.get('/foo.txt', function(data) {
  console.log(data);
});

Same-Origin Security Considerations

Note that this method will only work if the text file is located on the same domain as your JavaScript application. Same-origin security policies prohibit cross-domain resource communication.

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