64 lines
1.9 KiB
JavaScript
64 lines
1.9 KiB
JavaScript
// Implementation in ES6
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// https://gist.github.com/kottenator/9d936eb3e4e3c3e02598
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const paginate = (c, m) => {
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let current = c,
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last = m,
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delta = 1,
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left = current - delta,
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right = current + delta + 1,
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range = [],
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rangeWithDots = [],
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l;
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for (let i = 1; i <= last; i++) {
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if (i == 1 || i == last || i >= left && i < right) {
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range.push(i);
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}
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}
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for (let i of range) {
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if (l) {
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if (i - l === 2) {
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rangeWithDots.push(l + 1);
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} else if (i - l !== 1) {
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rangeWithDots.push('...');
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}
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}
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rangeWithDots.push(i);
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l = i;
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}
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return rangeWithDots;
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}
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export { paginate };
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/*
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Test it:
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for (let i = 1, l = 20; i <= l; i++)
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console.log(`Selected page ${i}:`, pagination(i, l));
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Expected output:
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Selected page 1: [1, 2, 3, "...", 20]
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Selected page 2: [1, 2, 3, 4, "...", 20]
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Selected page 3: [1, 2, 3, 4, 5, "...", 20]
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Selected page 4: [1, 2, 3, 4, 5, 6, "...", 20]
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Selected page 5: [1, 2, 3, 4, 5, 6, 7, "...", 20]
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Selected page 6: [1, "...", 4, 5, 6, 7, 8, "...", 20]
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Selected page 7: [1, "...", 5, 6, 7, 8, 9, "...", 20]
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Selected page 8: [1, "...", 6, 7, 8, 9, 10, "...", 20]
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Selected page 9: [1, "...", 7, 8, 9, 10, 11, "...", 20]
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Selected page 10: [1, "...", 8, 9, 10, 11, 12, "...", 20]
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Selected page 11: [1, "...", 9, 10, 11, 12, 13, "...", 20]
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Selected page 12: [1, "...", 10, 11, 12, 13, 14, "...", 20]
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Selected page 13: [1, "...", 11, 12, 13, 14, 15, "...", 20]
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Selected page 14: [1, "...", 12, 13, 14, 15, 16, "...", 20]
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Selected page 15: [1, "...", 13, 14, 15, 16, 17, "...", 20]
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Selected page 16: [1, "...", 14, 15, 16, 17, 18, 19, 20]
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Selected page 17: [1, "...", 15, 16, 17, 18, 19, 20]
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Selected page 18: [1, "...", 16, 17, 18, 19, 20]
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Selected page 19: [1, "...", 17, 18, 19, 20]
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Selected page 20: [1, "...", 18, 19, 20]
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*/ |