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singlepage.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="description" content="Time difference calculator" />
<meta name="author" content="Alessandro Ceserani" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<style type="text/css">
:root {
--bg: #fdf5e6;
--peacock: rgb(34, 78, 90);
--blue: rgb(43, 93, 148);
--arcticblue: rgb(160, 207, 211);
--mistygray: rgb(220, 221, 222);
--tigerorange: rgb(245, 106, 48);
--white: #fff;
--black: #000;
--steelgray: rgb(147, 149, 152);
--adjustColor: var(--tigerorange);
--shadows: rgba(0, 0, 0, 0.2) 0 3px 5px -1px, rgba(0, 0, 0, 0.14) 0 6px 10px 0,
rgba(0, 0, 0, 0.12) 0 1px 18px 0;
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
background-color: var(--bg);
text-align: center;
user-select: none;
}
button {
background-color: var(--white);
border-radius: 24px;
border-style: none;
box-shadow: var(--shadows);
color: var(--steelgray);
cursor: pointer;
padding: 0px 8px;
position: relative;
}
button:hover {
background: #f6f9fe;
color: var(--peacock);
max-height: 24px;
}
input {
border-radius: 4px;
}
input[type="time"] {
width: 100px;
}
table {
box-shadow: var(--shadows);
table-layout: fixed;
width: 100%;
max-width: 360px;
border-collapse: separate;
border-spacing: 0;
border: 2px solid black;
border-radius: 4px;
border-top-right-radius: 0px;
border-top-left-radius: 0px;
}
caption,
thead,
tfoot {
background-color: var(--peacock);
color: var(--white);
font-weight: bold;
}
caption {
border: 2px solid black;
border-bottom: 0px;
border-radius: 4px;
border-bottom-right-radius: 0px;
border-bottom-left-radius: 0px;
padding: 8px;
}
/* Delete button header cell */
thead th:nth-child(1) {
width: 8%;
}
/* Subtotal header cell */
thead th:nth-child(4) {
width: 22%;
}
th,
td {
padding: 8px;
}
tbody {
border: 1px solid black;
}
tbody tr:nth-child(even) {
background-color: var(--mistygray);
}
.alerts {
background-color: var(--mistygray);
}
#bodyContent {
max-width: 950px;
padding-top: 20px;
display: flex;
flex-flow: row wrap;
column-gap: 40px;
align-items: flex-start;
justify-content: space-evenly;
}
/* #calculator {} */
#secondaryCol {
width: 275px;
border-radius: 4px;
}
#options,
#keymap {
text-align: left;
border: 2px solid black;
box-shadow: var(--shadows);
border-radius: 4px;
margin-bottom: 16px;
}
#optionsContent,
#keymapContent {
margin: 8px;
}
#keymapContent {
display: none;
}
#optionsHeader,
#keymapHeader {
padding: 4px;
text-align: center;
background-color: var(--peacock);
color: var(--white);
font-weight: bold;
}
#keymapHeader {
cursor: pointer;
}
#keymapinfo {
font-size: x-small;
}
.optionsCheckbox {
margin-right: 8px;
margin-bottom: 4px;
}
.optionsCheckbox:hover input {
cursor: pointer;
}
.varInputsContainer {
display: flex;
flex-flow: column wrap;
align-items: flex-end;
padding-right: 8px;
padding-bottom: 8px;
}
.adjustVar {
font-weight: bolder;
color: var(--adjustColor);
}
.varInput {
width: 50px;
}
.keymapEntry {
margin: 2px;
}
.key {
display: inline-flex;
align-items: center;
justify-content: center;
cursor: pointer;
width: 20px;
height: 20px;
margin-right: 4px;
background-color: var(--blue);
color: var(--white);
border: 1px solid var(--black);
border-radius: 50%;
font-size: 12px;
font-family: monospace;
box-shadow: var(--shadows);
}
.adjusted {
font-style: italic;
font-weight: bold;
}
.keyCategoryHeader {
align-content: center;
color: var(--white);
display: flex;
background-color: var(--peacock);
border: 1px solid var(--black);
border-radius: 4px;
font-weight: bold;
margin: 2px;
padding: 4px;
}
.keyCategoryContent {
font-size: smaller;
padding: 4px;
background-color: var(--bg);
}
#notifications {
font-style: italic;
padding: 20px;
}
.fade-out {
opacity: 0;
transition: opacity 1s ease-out;
}
</style>
<title></title>
</head>
<body>
<script>
// %% Globals %%
const title = "Time Diff Calculator";
const defaultSubtotal = "---";
const defaultTime = "09:00";
const defaultDate = "2000-01-01";
const defaultX = -0.5;
const defaultY = 6;
/**
* @typedef {Object} State
* @property {boolean} adjustPerHour - Adjust calculations by x per y hours
* @property {string} focusedId - The id of the currently or previously focused calculator row
*/
/** @type {State} */
let state = {};
/**
* Set default `state` object
* @return {State}
*/
function setDefaultState() {
state = {
adjustPerHour: false,
focusedId: "startInput1",
fadingNotif: false,
};
}
/**
* @typedef {Object} TimeRow
* @property {number} startInput - Start time in milliseconds
* @property {number} endInput - End time in milliseconds
* @property {number} diff - Difference between start and end times
*/
/**
* Creates a new TimeRow Object
* @return {TimeRow}
*/
function createTimeRow() {
return {
startInput: new Date(`${defaultDate}T${defaultTime}Z`),
endInput: new Date(`${defaultDate}T${defaultTime}Z`),
diff: 0,
};
}
/**
* @typedef {Map<number, TimeRow>} TimeRows
* @description
* A Map of numerical indices as keys and TimeRow Objects as values
*/
/** @type {TimeRows} */
let timeRows = new Map();
/** @typedef {Object} ParsedId
* @description Results of regex parse of an id with format `{name}{index}`
* @property {string} name - name from parsed id, e.g. "row" parsed from "row1"
* @property {number} idx - idx from parsed id, e.g. 1 parsed from "row1"
*/
// %% Helpers %%
/**
* Shorthand for getting an HTMLElement by id
* @param {string} id Element id
* @returns {HTMLElement}
**/
function idGet(id) {
return document.getElementById(id);
}
/**
* Pad or truncate a number to two decimal places
* @param {number} num A Number object
* @return {number}
**/
function twoPad(num) {
return num.toFixed(2);
}
/**
* Transform a Date object into a number truncated to two decimal places
* @param {Date} dateObj A Date object
* @return {number}
**/
function dateToFraction(dateObj) {
const mm = Math.floor(dateObj / 1000 / 60) % 60;
const hh = Math.floor(dateObj / 1000 / 60 / 60);
const fractionalTime = hh + mm / 60;
return Math.round(fractionalTime * 100) / 100;
}
/**
* Uncheck all HTML input elements.
**/
function uncheckInputElements() {
const inputs = document.getElementsByTagName("input");
for (let i = 0; i < inputs.length; i++) {
inputs[i].checked = false;
}
}
/**
* Get an element's row index by parsing its id.
* @param {!string} id The id of an HTML element to parse.
* @return {ParsedId} name/idx pair parsed from id
**/
function parseElementId(id) {
const matches = id.match(/([A-Za-z]+)(\d+)/);
const name = matches[1];
const idx = Number(matches[2]);
return { name, idx };
}
/**
* Toggle the adjust by `adjustVarX` for every `adjustVarY` hours flag and
* update all subtotals and the total.
**/
function toggleAdjustPerHour() {
state.adjustPerHour = !state.adjustPerHour;
timeRows.forEach((_, k) => {
updateTimeDiff("startInput", k);
});
updateTotal();
}
/**
* Focus the first row of the table
**/
function focusFirstRow() {
idGet("startInput1").focus();
}
/**
* Show/hide keymap content
**/
function toggleKeymapVisibility() {
const keymapContent = idGet("keymapContent");
const visible = keymapContent.style.display;
keymapContent.style.display = visible == "block" ? "none" : "block";
}
/**
* Set or reset fade for notification div
**/
function setNotificationFade() {
setTimeout(() => {
state.fadingNotif = true;
notifications.classList.add("fade-out");
setTimeout(() => {
if (!state.fadingNotif) {
notifications.classList.remove("fade-out");
notifications.innerHTML = "";
state.fadingNotif = false;
}
}, 2500);
}, 2500);
}
// %% Main functionality %%
/**
* Update the time diff (subtotal) of a timeRow.
* @param {"startInput" | "endInput"} name Name of input element
* @param {number} idx Index to identify the timeRow
**/
function updateTimeDiff(name, idx) {
const timeRow = timeRows.get(idx);
const inputElement = idGet(`${name}${idx}`);
const subtotalCell = idGet(`subtotalCell${idx}`);
const value = inputElement.value;
const x = idGet("adjustVarX").value;
const y = idGet("adjustVarY").value;
// Re-evaluate whether we should set adjusted-style
subtotalCell.classList.remove("adjusted");
if (value == "") {
subtotalCell.innerText = defaultSubtotal;
timeRow.diff = 0;
return;
}
timeRow[name] = new Date(`${defaultDate}T${inputElement.value}Z`);
timeRow.diff = timeRow.endInput - timeRow.startInput;
// Handle overflows past midnight
if (timeRow.endInput < timeRow.startInput) {
timeRow.diff += 24 * 60 * 60 * 1000;
}
const hh = Math.floor(timeRow.diff / 1000 / 60 / 60);
if (state.adjustPerHour && hh >= y) {
const adjustment = Math.floor(hh / y) * x * 1000 * 60 * 60;
timeRow.diff += adjustment;
subtotalCell.classList.add("adjusted");
}
let fractionalTime = dateToFraction(timeRow.diff);
subtotalCell.innerText = twoPad(fractionalTime);
}
/**
* Update the total cell in the table to reflect the current totals.
@return {number} The fractional total
**/
function updateTotal() {
let total = 0;
timeRows.forEach((v, _) => {
total += v.diff;
});
let fractional = dateToFraction(total);
fractional = twoPad(fractional);
idGet("totalDiv").innerText = fractional;
return fractional;
}
/**
* Reset the HTML timeRows table and the timeRows Object.
**/
function resetTable() {
idGet("timeRows").replaceChildren([]);
timeRows = new Map();
addNewTimeRow();
updateTotal();
focusFirstRow();
setDefaultState();
}
/** Renumber the id of each row and its relevant children sequentially from 1.
* Useful to keep a regular sequence of ids after deleting a row.
* Also renumbers the entry keys of the timeRows map.
**/
function renumberRows() {
const tableRows = idGet("timeRows");
let currIdx;
let parsedRowId;
const toRename = [
"deleteCell",
"deleteButton",
"startCell",
"startInput",
"endCell",
"endInput",
"subtotalCell",
];
let newIdx = 1;
let newTimeRows = new Map();
for (let row of tableRows.children) {
parsedRowId = parseElementId(row.id);
currIdx = parsedRowId.idx;
row.id = `row${newIdx}`;
toRename.map((name) => {
idGet(`${name}${currIdx}`).id = `${name}${newIdx}`;
});
newTimeRows.set(newIdx, timeRows.get(Number(currIdx)));
newIdx++;
}
timeRows = newTimeRows;
}
/**
* Delete a row from the timeRows HTML table and the timeRows Object.
* @param {number} idx Index to identify the timeRow
**/
function deleteTimeRow(idx) {
idx = Number(idx);
const tableRows = idGet("timeRows");
const row = idGet(`row${idx}`);
row.remove();
timeRows.delete(idx);
updateTotal();
if (tableRows.children.length == 0) {
resetTable();
} else {
renumberRows();
}
// Always focus the next available row after deletion
const size = timeRows.size;
const targetIdx = size < idx + 1 ? size : idx;
const targetId = `startInput${targetIdx}`;
idGet(targetId).focus();
state.focusedId = targetId;
}
/**
* Create table cell that contains an input[type="time"] element.
* @param {('start'|'end')} name Name used for the input element's id
* @param {number} idx Index used for the input element's id
* @returns {HTMLTableCellElement}
**/
function createTimeInputCell(name, idx) {
/** @type {HTMLTableCellElement} */
const cell = document.createElement("td");
/** @type {HTMLInputElement} */
const input = document.createElement("input");
cell.id = `${name}Cell${idx}`;
input.id = `${name}Input${idx}`;
input.type = "time";
input.value = "09:00";
input.classList.add("timeInput");
input.oninput = function () {
const parsedId = parseElementId(input.id, null);
updateTimeDiff(parsedId.name, parsedId.idx);
updateTotal();
const subtotalCell = idGet(`subtotalCell${idx}`);
const isNumber = !isNaN(subtotalCell.innerText);
if (isNumber && !idGet(`row${parsedId.idx + 1}`)) {
addNewTimeRow();
}
};
input.onfocus = function () {
state.focusedId = input.id;
};
cell.append(input);
return cell;
}
/**
* Create a table cell that contains the timeRow's time difference (subtotal)
* @param {number} idx Index used for the cell's id
* @returns {HTMLTableCellElement}
**/
function createSubtotalCell(idx) {
/** @type {HTMLTableCellElement} */
const subtotalCell = document.createElement("td");
subtotalCell.id = `subtotalCell${idx}`;
subtotalCell.innerText = defaultSubtotal;
return subtotalCell;
}
/**
* Create a table cell that contains a button to delete the timeRow
* @param {number} idx Index used for the cell's id
* @returns {HTMLTableCellElement}
**/
function createDeleteCell(idx) {
/** @type {HTMLTableCellElement} */
const cell = document.createElement("td");
/** @type {HTMLButtonElement} */
const button = document.createElement("button");
cell.id = `deleteCell${idx}`;
button.id = `deleteButton${idx}`;
button.innerText = defaultSubtotal;
button.innerText = "🗑 ";
button.setAttribute("tabindex", "-1");
button.addEventListener("click", () => {
const parsedId = parseElementId(button.id);
deleteTimeRow(parsedId.idx);
});
cell.append(button);
return cell;
}
/**
* Add a new row to the `timeRows` table.
**/
function addNewTimeRow() {
let idx = timeRows.size + 1;
const tableRow = document.createElement("tr");
const deleteCell = createDeleteCell(idx);
const startCell = createTimeInputCell("start", idx);
const endCell = createTimeInputCell("end", idx);
const subtotalCell = createSubtotalCell(idx);
tableRow.id = `row${idx}`;
tableRow.append(deleteCell, startCell, endCell, subtotalCell);
idGet("timeRows").append(tableRow);
timeRows.set(idx, createTimeRow());
}
// %% Vim-like bindings %%
/**
* A representation of a key to press and the description of its action.
* @typedef {Object} VimKey
* @property {!string} key - The key to be pressed
* @property {?string} display - Optional display character for the key
* @property {!string} desc - The description of its action
* @property {!string} cat - The action's category (nav, manipulation, etc.)
*/
/** @typedef {Object} VimKeymap
* @property {VimKey} decMin - Decrease minutes by 1
* @property {VimKey} incMin - Increase minutes by 1
* @property {VimKey} decHour - Decrease hour by 1
* @property {VimKey} incHour - Increase hour by 1
* @property {VimKey} middayToggle - toggle AM/PM
* @property {VimKey} moveUp - Move up a row
* @property {VimKey} moveDown - Move down a row
* @property {VimKey} moveLeft - Move left within a row
* @property {VimKey} moveRight - Move right within a row
* @property {VimKey} goFirst - Go to the first row
* @property {VimKey} goLast - Go to the last row
* @property {VimKey} moveNext - Go to the start of the next row
* @property {VimKey} newRow - Create a new row
* @property {VimKey} deleteRow - Delete the currently focused row
* @property {VimKey} resetTable - Reset the table's content
* @property {VimKey} clearField - Clear the current input field
* @property {VimKey} yankTotal - Yank the total to the system clipboard
* @property {VimKey} yankTable - Yank the total to the system clipboard
* @property {VimKey} toggleAdjust - Toggle x for y adjustment
*/
class VimActions {
/**
* Create object for adding Vim like keybinds for the page
* @class
*/
constructor() {
/** @type {VimKeymap} **/
this.keymap = {
moveNext: {
key: "Enter",
display: "⏎",
desc: "move to start of next row",
cat: "Navigation",
action: this.navigate,
},
moveDown: {
key: "j",
desc: "move down a row",
cat: "Navigation",
action: this.navigate,
},
moveUp: {
key: "k",
desc: "move up a row",
cat: "Navigation",
action: this.navigate,
},
moveLeft: {
key: "h",
desc: "move left a field",
cat: "Navigation",
action: this.navigate,
},
moveRight: {
key: "l",
desc: "move right a field",
cat: "Navigation",
action: this.navigate,
},
goFirst: {
key: "g",
desc: "go to first row",
cat: "Navigation",
action: this.navigate,
},
goLast: {
key: "G",
desc: "go to last row",
cat: "Navigation",
action: this.navigate,
},
decMin: {
key: "J",
desc: "decrease by 1 minute",
cat: "Input",
action: this.adjustTime,
},
incMin: {
key: "K",
desc: "increase by 1 minute",
cat: "Input",
action: this.adjustTime,
},
decHour: {
key: "H",
desc: "decrease by 1 hour",
cat: "Input",
action: this.adjustTime,
},
incHour: {
key: "L",
desc: "increase by 1 hour",
cat: "Input",
action: this.adjustTime,
},
middayToggle: {
key: "x",
desc: "toggle AM/PM",
cat: "Input",
action: this.adjustTime,
},
newRow: {
key: "n",
desc: "create a new row",
cat: "Table",
action: this.newRow,
},
deleteRow: {
key: "d",
desc: "delete the current row",
cat: "Table",
action: this.deleteRow,
},
clearField: {
key: "c",
desc: "clear the current input field",
cat: "Table",
action: this.clear,
},
resetTable: {
key: "r",
desc: "reset the table",
cat: "Table",
action: this.reset,
},
yankTotal: {
key: "y",
desc: "yank (copy) the total to the system clipboard",
cat: "Table",
action: this.yankTotal,
},
yankTable: {
key: "Y",
desc: "copy all complete rows in TSV format to the system clipboard",
cat: "Table",
action: this.yankTable,
},
toggleAdjust: {
key: "z",
desc: "toggle adjustments",
cat: "Misc",
action: this.toggleAdjust,
},
displayKeymap: {
key: "?",
desc: "show/hide this keymap",
cat: "Misc",
action: this.displayKeymap,
},
};
}
/**
* Set actions for keypresses as specified in Vim.keymap
*/
setKeybinds() {
for (const [_, vimKey] of Object.entries(this.keymap)) {
document.addEventListener("keydown", (e) => {
if (e.key == vimKey.key) {
vimKey.action(e, this.keymap);
}
});
}
}
/**
Set the HTML content of the keymap guide
*/
setKeymapContent() {
for (const [actionName, vimKey] of Object.entries(this.keymap)) {
const entry = document.createElement("div");
const keyIcon = document.createElement("span");
const description = document.createElement("span");
entry.id = `vim${actionName.charAt(0).toUpperCase()}${actionName.slice(1)}`;
keyIcon.innerText = vimKey.display == null ? vimKey.key : vimKey.display;
keyIcon.className = "key";
// Clicking on a key icon performs its action
const mocked_event = { key: vimKey.key };
const keymap = this.keymap;
keyIcon.addEventListener("mousedown", () => {
keyIcon.onmouseup = function () {
vimKey.action(mocked_event, keymap);
idGet(state.focusedId).focus();
};
});
description.innerText = vimKey.desc;
entry.append(keyIcon, description);
entry.className = "keymapEntry";
idGet(`keyCat${vimKey.cat}`).append(entry);
}
}
/**
* Create a new timeRow
*/
newRow() {
addNewTimeRow();
}
/**
* Delete a time row
*/
deleteRow() {
try {
const parsedId = parseElementId(state.focusedId);
const idx = parsedId.idx;
const row = idGet(`row${idx}`);
if (row !== undefined) {
deleteTimeRow(idx);
}
} catch (err) {
console.log(err);
}
}
/**
* Clear the focused input field
*/
clear() {
const focusedInput = idGet(state.focusedId);
focusedInput.value = "";
focusedInput.blur();
focusedInput.focus();
const parsedId = parseElementId(focusedInput.id);
updateTimeDiff(parsedId.name, parsedId.idx);
updateTotal();
}
/**
* Reset all content
*/
reset() {
resetTable();
}
/**
* Adjust time minutes or hours by 1 unit, and toggle AM/PM
*/
adjustTime(e, keymap) {
const focusedInput = idGet(state.focusedId);
switch (e.key) {
case keymap.decHour.key:
focusedInput.stepDown(60);
break;
case keymap.decMin.key:
focusedInput.stepDown(1);
break;
case keymap.incMin.key:
focusedInput.stepUp(1);
break;
case keymap.incHour.key:
focusedInput.stepUp(60);
break;
case keymap.middayToggle.key:
const hh = focusedInput.value.match(/(\d+)/)[1];
let step = Number(hh) < 12 ? 720 : -720;
focusedInput.stepUp(step);
break;
}
const event = new Event("input");
focusedInput.dispatchEvent(event);
}
/**
* Navigate to next, previous, first, or last row, or move to next/prev field
*/
navigate(e, keymap) {
const startType = "startInput";
const endType = "endInput";
let focusedInput = idGet(state.focusedId);
const matches = focusedInput.id.match(/([A-Za-z]+)(\d+)/);
let type = matches[1];
let rowIdx = Number(matches[2]);
if (e.key == keymap.moveUp.key) {
rowIdx = Math.max(1, rowIdx - 1);
} else if (e.key == keymap.moveDown.key || e.key == keymap.moveNext.key) {
rowIdx = Math.min(timeRows.size, rowIdx + 1);
}
switch (e.key) {
case keymap.moveNext.key:
type = startType;
break;
case keymap.moveLeft.key:
type = startType;
break;
case keymap.moveDown.key:
break;
case keymap.moveUp.key:
break;
case keymap.moveRight.key:
type = endType;
break;
case keymap.goFirst.key:
rowIdx = 1;
type = startType;
break;
case keymap.goLast.key:
rowIdx = timeRows.size;
type = startType;
break;
}
const targetId = `${type}${rowIdx}`;
idGet(targetId).focus();
}
/**
* Yank total to the system clipboard.
*/
yankTotal() {
const total = updateTotal();
navigator.clipboard
.writeText(total)
.then(() => {
console.log("Copy success:", total);
const notifications = idGet("notifications");
notifications.classList.remove("fade-out");
notifications.innerHTML = `Copied total (${total}) to clipboard!`;
setNotificationFade();
})
.catch((err) => {
console.error("Error copying text: ", err);
});
}
/**
* Yank all completed rows as a TSV to the system clipboard.
**/