Visualization toolmaker. Founder @observablehq. Creator @d3. Former @nytgraphics. Pronounced BOSS-tock.
Published
Edited
Aug 8, 2018
3 forks
Importers
18 stars
input
debounce(viewof input)
function debounce(input, delay = 1000) {
return Generators.observe(notify => {
let timer = null;
let value;
// On input, check if we recently reported a value.
// If we did, do nothing and wait for a delay;
// otherwise, report the current value and set a timeout.
function inputted() {
if (timer !== null) return;
notify(value = input.value);
timer = setTimeout(delayed, delay);
}
// After a delay, check if the last-reported value is the current value.
// If it’s not, report the new value.
function delayed() {
timer = null;
if (value === input.value) return;
notify(value = input.value);
}
input.addEventListener("input", inputted), inputted();
return () => input.removeEventListener("input", inputted);
});
}
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