rangitaki/rcc/res/rcc.js

/**
 * JavaScript for RCC
 *
 * Copyright (c) 2016 by mmk2410
 * License: MIT License
 */

window.onload = function () {
    var t = document.getElementsByTagName('textarea')[0];
    var offset = !window.opera ? (t.offsetHeight - t.clientHeight) : (
        t.offsetHeight + parseInt(
          window.getComputedStyle(t, null).getPropertyValue('border-top-width')
        )
    );

    /**
     * The following three code clocks are for proper resizing of the input
     * textarea
     */
    var resize = function (t) {
        t.style.height = 'auto';
        t.style.height = (t.scrollHeight + offset ) + 'px';
    };

    t.addEventListener && t.addEventListener('input', function (event) {
        resize(t);
    });

    t.attachEvent && t.attachEvent('onkeyup', function () {
        resize(t);
    });
};