18 lines
991 B
JavaScript
18 lines
991 B
JavaScript
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/**
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* Given the number of pages to display, the current page and the total pages,
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* returns the min and max index of the pages to display in the pagination component.
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*
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* @param {integer} pagesToDisplay Maximum number of pages to display in the pagination component.
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* @param {integer} currentPage Page currently visible.
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* @param {integer} totalPages Total pages available.
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* @return {object} Object containing the min and max index to display in the pagination component.
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*/
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export const getIndexes = ( pagesToDisplay, currentPage, totalPages ) => {
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const extraPagesToDisplay = pagesToDisplay - 1;
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const tentativeMinIndex = Math.max( Math.floor( currentPage - ( extraPagesToDisplay / 2 ) ), 1 );
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const maxIndex = Math.min( Math.ceil( currentPage + ( extraPagesToDisplay - ( currentPage - tentativeMinIndex ) ) ), totalPages );
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const minIndex = Math.max( Math.floor( currentPage - ( extraPagesToDisplay - ( maxIndex - currentPage ) ) ), 1 );
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return { minIndex, maxIndex };
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};
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