Create classes to reduce duplication
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index.html
360
index.html
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@ -22,6 +22,10 @@
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display: none;
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}
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.error-message {
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color: red;
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}
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input[data-entered=true]:valid {
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background-color: green;
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}
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@ -52,26 +56,26 @@
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<form>
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<label for="century" id="century-label">Century</label>
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<input type="text" id="century" autocomplete="off" autofocus /> <!--list="weekdays"-->
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<span class="invisible" id="century-error">Error message</span>
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<span class="invisible error-message" id="century-error">Error message</span>
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<label for="year" id="year-label">Year</label>
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<input type="text" id="year" autocomplete="off" />
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<span class="invisible" id="year-error">Error message</span>
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<span class="invisible error-message" id="year-error">Error message</span>
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<label for="day" id="day-label">Day</label>
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<input type="text" id="day" autocomplete="off" />
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<span class="invisible" id="day-error">Error message</span>
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<span class="invisible error-message" id="day-error">Error message</span>
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<!-- <datalist id="weekdays">-->
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<!-- <option value="Monday">-->
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<!-- <option value="Tuesday">-->
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<!-- <option value="Wednesday">-->
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<!-- <option value="Thursday">-->
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<!-- <option value="Friday">-->
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<!-- <option value="Saturday">-->
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<!-- <option value="Sunday">-->
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<!-- </datalist>-->
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<!-- <datalist id="weekdays">-->
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<!-- <option value="Monday">-->
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<!-- <option value="Tuesday">-->
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<!-- <option value="Wednesday">-->
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<!-- <option value="Thursday">-->
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<!-- <option value="Friday">-->
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<!-- <option value="Saturday">-->
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<!-- <option value="Sunday">-->
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<!-- </datalist>-->
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</form>
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</section>
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@ -91,121 +95,257 @@
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<!-- Scripts -->
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<script src="https://static.fwdekker.com/js/common.js" crossorigin="anonymous"></script>
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<script>
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// rand in range [min, max] (both inclusive)
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const random = function (min, max) {
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/**
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* Returns a number between `min` (inclusive) and `max` (inclusive).
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*
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* @param min the lower bound of permissible values
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* @param max the upper bound of permissible values
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*/
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function generateRandom(min, max) {
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return Math.floor((Math.random() * (max - min + 1)) + min);
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};
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}
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// generate date in range [0001-01-01, 9999-12-31]
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const generateDate = function () {
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const minDate = new Date("0001-01-01").getTime() / 86400000;
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const maxDate = new Date("9999-12-31").getTime() / 86400000;
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return new Date(random(minDate, maxDate) * 86400000);
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};
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const dayNumberToWeekDay = function (dayNumber) {
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switch (dayNumber) {
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case 0:
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return "Sunday";
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case 1:
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return "Monday";
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case 2:
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return "Tuesday";
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case 3:
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return "Wednesday";
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case 4:
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return "Thursday";
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case 5:
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return "Friday";
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case 6:
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return "Saturday";
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/**
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* An element that can be validated.
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*
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* In particular, the century, year, and day inputs of the Doomsday test.
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*/
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class ValidatableElement {
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/**
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* Constructs a new validatable element and registers event listeners.
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*
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* @param element the element that is validatable
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* @param titleLabel the label with the `labelFor` property for the element given as the first parameter
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* @param errorLabel the label to display errors in
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*/
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constructor(element, titleLabel, errorLabel) {
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this.element = element;
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this.titleLabel = titleLabel;
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this.errorLabel = errorLabel;
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this.element.addEventListener("keydown", event => {
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if (event.key !== "Enter")
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return;
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this.element.dataset["entered"] = "true";
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const errorMessage = this.validate(this.element.value);
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this.element.setCustomValidity(errorMessage || "");
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this.errorLabel.innerText = errorMessage || "";
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if (errorMessage === null) {
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this.errorLabel.classList.add("invisible");
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this.onValidInput();
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} else {
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this.errorLabel.classList.remove("invisible");
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this.element.select();
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this.onInvalidInput();
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}
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});
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}
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};
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const centuryToAnchor = function (century) { // century is e.g. 1900 or 19, doesn't really matter since it's mod
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return dayNumberToWeekDay((5 * (century % 4)) % 7 + 2);
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};
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const yearToAnchor = function (year) {
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return dayNumberToWeekDay((new Date("" + year + "-04-04")).getDay());
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};
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const showError = function (input, errorLabel) {
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/**
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* Returns `undefined` if the element is valid, or an error message explaining why it is invalid otherwise.
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*
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* This method **must** be implemented by subclasses.
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*
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* @param value the value of the element to validate
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*/
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validate(value) {
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throw new Error("Implement this method.");
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}
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};
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/**
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* Runs when the user submits a valid input.
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*
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* This method **must** be implemented by subclasses.
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*/
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onValidInput() {
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throw new Error("Implement this method.");
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}
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/**
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* Runs when a user submits an invalid input.
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*
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* This method **must** be implemented by subclasses.
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*/
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onInvalidInput() {
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throw new Error("Implement this method.");
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}
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/**
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* Resets the element to its initial state, removing error messages and user input.
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*/
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reset() {
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this.element.dataset["entered"] = "false";
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this.element.value = "";
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this.element.setCustomValidity("");
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this.errorLabel.classList.add("invisible");
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this.errorLabel.innerText = "";
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}
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/**
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* Focuses the input element.
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*/
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focus() {
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this.element.select();
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}
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/**
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* Sets the title above the input.
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*
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* @param title the title to set
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*/
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setTitle(title) {
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this.titleLabel.innerText = title;
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}
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}
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/**
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* A wrapper around the good ol' `Date` class that provides a bunch of useful Doomsday-specific methods.
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*/
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class DoomsdayDate {
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/**
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* Wraps a `DoomsdayDate` around the given `Date`.
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*
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* @param date the `Date` to be wrapped
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*/
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constructor(date) {
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this.date = date;
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}
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/**
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* Returns the day of the week of the anchor of this `DoomsdayDate`'s century as a string.
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*/
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getCenturyAnchorString() {
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const yearNumber = this.date.getFullYear();
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const centuryNumber = Math.floor(yearNumber / 100);
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const centuryAnchorNumber = (5 * (centuryNumber % 4)) % 7 + 2;
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return DoomsdayDate.dayNumberToString(centuryAnchorNumber);
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};
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/**
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* Returns the day of the week of the anchor day of this `DoomsdayDate`'s year as a string.
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*/
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getYearAnchorString() {
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const anchorDate = new Date(this.date);
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anchorDate.setMonth(3); // April
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anchorDate.setDate(4); // 4th
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return DoomsdayDate.dayNumberToString(anchorDate.getDay());
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};
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/**
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* Returns the day of the week of this `DoomsdayDate` as a string.
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*/
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getWeekdayString() {
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return DoomsdayDate.dayNumberToString(this.date.getDay());
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};
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/**
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* Returns the name of the day given its 0-based index, where 0 is `Sunday`.
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*
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* @param dayNumber the number of the day, as returned by `Date`'s `#getDay` function.
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*/
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static dayNumberToString(dayNumber) {
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switch (dayNumber % 7) {
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case 0:
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return "Sunday";
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case 1:
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return "Monday";
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case 2:
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return "Tuesday";
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case 3:
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return "Wednesday";
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case 4:
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return "Thursday";
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case 5:
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return "Friday";
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case 6:
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return "Saturday";
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}
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};
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/**
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* Returns a random date in the range `0001-01-01` (inclusive) to `9999-12-31` (inclusive), wrapped inside a
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* `DoomsdayDate` object.
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*/
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static random() {
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// TODO Give custom dates to this method
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const minDate = new Date("0001-01-01").getTime() / 86400000;
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const maxDate = new Date("9999-12-31").getTime() / 86400000;
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return new DoomsdayDate(new Date(generateRandom(minDate, maxDate) * 86400000));
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}
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}
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doAfterLoad(() => {
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const centuryInput = $("#century");
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const centuryLabel = $("#century-label");
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const yearInput = $("#year");
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const yearLabel = $("#year-label");
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const dayInput = $("#day");
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const dayLabel = $("#day-label");
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let quizDate;
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const centuryClass = new class extends ValidatableElement {
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validate(value) {
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return value === quizDate.getCenturyAnchorString() ? null : "";
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}
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const reloadQuiz = function () {
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centuryInput.dataset["entered"] = "false";
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centuryInput.value = "";
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yearInput.dataset["entered"] = "false";
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yearInput.value = "";
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dayInput.dataset["entered"] = "false";
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dayInput.value = "";
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onValidInput() {
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console.log("valid");
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yearClass.focus();
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}
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quizDate = generateDate();
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centuryLabel.innerText = Math.floor(quizDate.getFullYear() / 100) * 100;
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yearLabel.innerText = quizDate.getFullYear();
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dayLabel.innerText = quizDate.toISOString().substr(0, 10);
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onInvalidInput() {
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// Do nothing
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}
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}($("#century"), $("#century-label"), $("#century-error"));
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const yearClass = new class extends ValidatableElement {
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validate(value) {
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return value === quizDate.getYearAnchorString() ? null : "";
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}
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centuryInput.select();
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onValidInput() {
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dayClass.focus();
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}
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onInvalidInput() {
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// Do nothing
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}
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}($("#year"), $("#year-label"), $("#year-error"));
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const dayClass = new class extends ValidatableElement {
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validate(value) {
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return value === quizDate.getWeekdayString() ? null : "";
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}
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onValidInput() {
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reloadQuiz();
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}
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onInvalidInput() {
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// Do nothing
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}
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}($("#day"), $("#day-label"), $("#day-error"));
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function reloadQuiz() {
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quizDate = DoomsdayDate.random();
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centuryClass.reset();
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yearClass.reset();
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dayClass.reset();
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centuryClass.setTitle("" + Math.floor(quizDate.date.getFullYear() / 100) * 100);
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yearClass.setTitle("" + quizDate.date.getFullYear());
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dayClass.setTitle("" + quizDate.date.toISOString().substr(0, 10));
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centuryClass.focus();
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// console.log(centuryToAnchor(quizDate));
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// console.log(yearToAnchor(quizDate));
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// console.log(dateToWeekDay(quizDate));
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}
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console.log(centuryToAnchor(Math.floor(quizDate.getFullYear() / 100)));
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console.log(yearToAnchor(quizDate.getFullYear()));
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console.log(dayNumberToWeekDay(quizDate.getDay()));
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};
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reloadQuiz();
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centuryInput.addEventListener("keydown", event => {
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if (event.key === "Enter") {
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centuryInput.dataset["entered"] = "true";
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if (centuryInput.value === centuryToAnchor(Math.floor(quizDate.getFullYear() / 100))) {
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centuryInput.setCustomValidity("");
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yearInput.select();
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} else {
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centuryInput.setCustomValidity("Wrong day");
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centuryInput.select();
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}
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}
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});
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yearInput.addEventListener("keydown", event => {
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if (event.key === "Enter") {
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yearInput.dataset["entered"] = "true";
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if (yearInput.value === yearToAnchor(quizDate.getFullYear())) {
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yearInput.setCustomValidity("");
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dayInput.select();
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} else {
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yearInput.setCustomValidity("Wrong day");
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yearInput.select();
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}
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}
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});
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dayInput.addEventListener("keydown", event => {
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if (event.key === "Enter") {
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dayInput.dataset["entered"] = "true";
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if (dayInput.value === dayNumberToWeekDay(quizDate.getDay())) {
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reloadQuiz();
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} else {
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dayInput.setCustomValidity("Wrong day");
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dayInput.select();
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}
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}
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});
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});
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</script>
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</body>
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