Web developer and autodidact with an interest in creative coding.
ranges = d3.pairs([0, .25, .5, .75, 1])
viewof demo = inputTemplate(
Inputs.form(
linkRanges(
// Create a slider for each range
ranges.map(
(value, i) => interval([0, 1], {
value,
color: ["#f00", "#0c0", "#fa0", "#5af"][i],
// Hide values
format: d => htl.html.fragment``,
step: .01,
// Match the default Inputs width
width: 240
})
)
)
),
{ label: "Ranges", width: 120 }
)
demo
// We could call linkRanges separately, but it's better to have our side
// effects linked to one of the ranges.
viewof rangeA = linkRanges(
[
interval([0, 1], { step: .01, value: [.25, .5] }),
viewof rangeB,
viewof rangeC,
],
{
// This cell produces side effects (it attaches event handlers)
// and needs to clean up after itself. Pass the invalidation promise!
invalidation,
// We want to let the Runtime know when neighboring cells got updated.
// Tell linkRanges to dispatch input events for those.
dispatch: true
}
)[0] // Lastly, return the first input that we just created
viewof rangeB = interval([0, 1], { step: .01, value: [.5, .75] })
viewof rangeC = interval([0, 1], { step: .01, value: [.75, .9] })
demoSeparate = Inputs.table([rangeA, rangeB, rangeC])
function linkRanges(inputs, options = {}) {
const {
invalidation: invalidated = invalidation,
dispatch = false
} = options;
const ProxyEvent = class extends Event {};
const clamp = (a, b, v) => v < a ? a : v > b ? b : v;
const views = Array.from(inputs);
const update = i => {
const view = views[i];
const p = views[i - 1];
const n = views[i + 1];
const min = p?.value[0] ?? -Infinity;
const max = n?.value[1] ?? Infinity;
let [a, b] = view.value;
a = clamp(min, max, a);
b = clamp(min, max, b);
if(p) p.value = [min, Math.max(min, a)];
if(n) n.value = [Math.min(b, max), max];
view.value = [a, b];
if(dispatch) {
if(p) p.dispatchEvent(new ProxyEvent("input", {bubbles: true}));
if(n) n.dispatchEvent(new ProxyEvent("input", {bubbles: true}));
}
};
for(const [i, view] of views.entries()) {
update(i);
const onInput = e => e instanceof ProxyEvent || update(i);
view.addEventListener("input", onInput);
invalidated.then(() => view.removeEventListener("input", onInput));
}
return inputs;
}
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