Wanikani Mistake Delay

Adds a delay after wrong answers to prevent double-tapping <enter>
当前为 2017-10-17 提交的版本，查看最新版本。
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// ==UserScript==
// @name        Wanikani Mistake Delay
// @namespace   wkmistakedelay
// @description Adds a delay after wrong answers to prevent double-tapping <enter>
// @include     https://www.wanikani.com/review/session*
// @include     https://www.wanikani.com/lesson/session*
// @version     2.0.0
// @author      Robin Findley
// @copyright   2017+, Robin Findley
// @license     MIT; http://opensource.org/licenses/MIT
// @run-at      document-end
// @grant       none
// ==/UserScript==

window.wkmistakedelay = {};

(function(gobj) {

    // The amount of time to disable 2nd <enter> after a mistake (in milliseconds).
    var DELAY_PERIOD = 2000;

    var old_submit_handler, old_answer_checker, ignore_submit = false;

    function new_answer_checker() {
        // Call the original answer checker.
        var result = old_answer_checker.apply(this, arguments);

        // If we didn't pass,
        if (!result.passed) {
            ignore_submit = true;
            setTimeout(function() {
                ignore_submit = false;
                $('#user-response').attr('disabled','disabled');
            }, DELAY_PERIOD);
        }
        return result;
    }

    function new_submit_handler(e) {
        if (ignore_submit) return false;
        return old_submit_handler.apply(this, arguments);
    }

    function startup() {
        // Check if we can intercept the submit button handler.
        try {
            old_submit_handler = $._data( $('#answer-form button')[0], 'events').click[0].handler;
            old_answer_checker = answerChecker.evaluate;
        } catch(err) {
        }
        if (typeof old_submit_handler !== 'function' || typeof old_answer_checker !== 'function') {
            alert('Wanikani Mistake Delay script is not working.');
            return;
        }

        // Replace the handlers.
        $._data( $('#answer-form button')[0], 'events').click[0].handler = new_submit_handler;
        answerChecker.evaluate = new_answer_checker;
    }

    // Run startup() after window.onload event.
    if (document.readyState === 'complete')
        startup();
    else
        window.addEventListener("load", startup, false);

})(window.wkselfstudy);