30 lines
2.1 KiB
JavaScript
30 lines
2.1 KiB
JavaScript
function itemsOf(result) { return Array.isArray(result) ? result : (result && result.items) || []; }
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function totalOf(result) { return result && result.total != null ? Number(result.total) : itemsOf(result).length; }
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function startList(page, number) {
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number = Number(number) || 1;
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if (page._paginationFirst || (number > 1 && (page.data.loadingMore || page.data.loading || page.data.loadError || !page.data.hasMore))) return null;
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if (number === 1) { page._paginationFirst = true; page._paginationGeneration = (page._paginationGeneration || 0) + 1; }
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const ticket = { page: number, generation: page._paginationGeneration };
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page.setData(number === 1 ? {loading: !page._hasCachedData, loadError:false, loadingMore:false, moreError:false} : {loadingMore:true, moreError:false});
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return ticket;
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}
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function current(page, ticket) { return ticket.generation === page._paginationGeneration; }
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function mergeUnique(previous, added) {
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const seen=new Set();return previous.concat(added).filter(item=>{const id=String(item.id);if(seen.has(id))return false;seen.add(id);return true;});
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}
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function applyList(page, ticket, result, items, field, extra) {
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if (!current(page,ticket)) return;
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const list=ticket.page===1?items:mergeUnique(page.data[field]||[],items);
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const total=totalOf(result);
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page.setData(Object.assign({[field]:list,page:ticket.page,total,hasMore:!Array.isArray(result)&&(result.has_more != null ? !!result.has_more : ticket.page*20<total),moreError:false},extra));
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}
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function failList(page,ticket) { if(current(page,ticket))page.setData(ticket.page===1?{loadError:true}:{moreError:true}); }
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function finishList(page,ticket) { if(current(page,ticket)){if(ticket.page===1)page._paginationFirst=false;page.setData({loading:false,loadingMore:false});} }
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function withListPagination(definition, loader) {
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Object.assign(definition.data,{page:1,total:0,hasMore:false,loadingMore:false,moreError:false});
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const load=definition[loader];
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definition.loadMore=function(){return load.call(this,(this.data.page||1)+1);};
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return definition;
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}
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module.exports={itemsOf,totalOf,startList,current,mergeUnique,applyList,failList,finishList,withListPagination};
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