Display text file in JavaScript

Question

What code should I use to display the contents of a plain-text .txt file in JavaScript? I want the text to scroll on screen in the active window.

Thanks in advance!<

Answer 1

To get the text to display with new lines etc, use a

 or a </code>, i.e.</p>

<pre><code><pre id="contents"></pre>
</code></pre>

<p>Next is, where is the plain text file?</p>

<h2>From a Server</h2>

<p>Use XMLHttpRequest</p>

<pre><code>function populatePre(url) {
    var xhr = new XMLHttpRequest();
    xhr.onload = function () {
        document.getElementById('contents').textContent = this.responseText;
    };
    xhr.open('GET', url);
    xhr.send();
}
populatePre('path/to/file.txt');
</code></pre>

<h2>From the local machine</h2>

<p>Make the user select the file using an <code><input type="file" /></code></p>

<pre><code><input type="file" id="filechoice" />
</code></pre>

<p>Then when the user selects a file, use FileReader to populate the <code><pre></code></p>

<pre><code>document
    .getElementById('filechoice')
    .addEventListener(
        'change',
        function () {
            var fr = new FileReader();
            fr.onload = function () {
                document.getElementById('contents').textContent = this.result;
            };
            fr.readAsText(this.files[0]);
        }
    );
</code></pre>
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