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36 lines
665 B
36 lines
665 B
6 years ago
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<script>
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let visible = false;
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function typewriter(node, { speed = 50 }) {
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const valid = (
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node.childNodes.length === 1 &&
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node.childNodes[0].nodeType === 3
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);
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if (!valid) {
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throw new Error(`This transition only works on elements with a single text node child`);
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}
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const text = node.textContent;
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const duration = text.length * speed;
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return {
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duration,
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tick: t => {
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const i = ~~(text.length * t);
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node.textContent = text.slice(0, i);
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}
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};
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}
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</script>
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<label>
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<input type="checkbox" bind:checked={visible}>
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visible
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</label>
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{#if visible}
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<p in:typewriter>
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The quick brown fox jumps over the lazy dog
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</p>
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{/if}
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