Codes for better mapping experience.
viewof i = Scrubber(numbers)
numbers = Array.from({length: 256}, (_, i) => i)
md`The current value of *i* is ${i}.`
Scrubber(numbers, {autoplay: false})
Scrubber(numbers, {loop: false})
Scrubber(numbers, {loop: false, alternate: true})
Scrubber(["red", "green", "blue"], {delay: 1000})
Scrubber(numbers, {initial: numbers.length - 1, loopDelay: 1000})
dates = Array.from({length: 365}, (_, i) => {
const date = new Date(2019, 0, 1);
date.setDate(i + 1);
return date;
})
viewof date = Scrubber(dates, {
autoplay: false,
format: date => date.toLocaleString("en", {month: "long", day: "numeric"})
})
function Scrubber(values, {
format = value => value,
initial = 0,
delay = null,
autoplay = true,
loop = true,
loopDelay = null,
alternate = false
} = {}) {
values = Array.from(values);
const form = html`<form style="font: 12px var(--sans-serif); font-variant-numeric: tabular-nums; display: flex; height: 25px; align-items: center;">
<button name=b type=button style="margin-right: 0.4em; width: 180px;"></button>
<label style="display: flex; align-items: center;">
<input id="mapScrubber" name=i type=range min=0 max=${values.length - 1} value=${initial} step=1 style="width: 300px;">
<output id="mapScrubberText" name=o style="margin-left: 0.4em;"></output>
</label>
</form>`;
let frame = null;
let timer = null;
let interval = null;
let direction = 1;
function start() {
form.b.textContent = "Pause";
if (delay === null) frame = requestAnimationFrame(tick);
else interval = setInterval(tick, delay);
}
function stop() {
form.b.textContent = "Play 70 years of typhoons";
if (frame !== null) cancelAnimationFrame(frame), frame = null;
if (timer !== null) clearTimeout(timer), timer = null;
if (interval !== null) clearInterval(interval), interval = null;
}
function running() {
return frame !== null || timer !== null || interval !== null;
}
function tick() {
if (form.i.valueAsNumber === (direction > 0 ? values.length - 1 : direction < 0 ? 0 : NaN)) {
if (!loop) return stop();
if (alternate) direction = -direction;
if (loopDelay !== null) {
if (frame !== null) cancelAnimationFrame(frame), frame = null;
if (interval !== null) clearInterval(interval), interval = null;
timer = setTimeout(() => (step(), start()), loopDelay);
return;
}
}
if (delay === null) frame = requestAnimationFrame(tick);
step();
}
function step() {
form.i.valueAsNumber = (form.i.valueAsNumber + direction + values.length) % values.length;
form.i.dispatchEvent(new CustomEvent("input", {bubbles: true}));
}
form.i.oninput = event => {
if (event && event.isTrusted && running()) stop();
form.value = values[form.i.valueAsNumber];
form.o.value = format(form.value, form.i.valueAsNumber, values);
};
form.b.onclick = () => {
if (running()) return stop();
direction = alternate && form.i.valueAsNumber === values.length - 1 ? -1 : 1;
form.i.valueAsNumber = (form.i.valueAsNumber + direction) % values.length;
form.i.dispatchEvent(new CustomEvent("input", {bubbles: true}));
start();
};
form.i.oninput();
if (autoplay) start();
else stop();
Inputs.disposal(form).then(stop);
return form;
}
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