pagination.js•4.63 kB
// 分页工具模块
// 分页配置
const DEFAULT_PAGE_SIZE = 20;
const MAX_PAGE_SIZE = 100;
// 分页状态存储
const paginationStates = new Map();
// 创建分页结果
export function createPaginatedResult(results, pageSize = DEFAULT_PAGE_SIZE, sessionId = 'default') {
if (!Array.isArray(results)) {
return { data: results, pagination: null };
}
pageSize = Math.min(pageSize, MAX_PAGE_SIZE);
if (results.length <= pageSize) {
return { data: results, pagination: null };
}
// 存储完整结果到分页状态
paginationStates.set(sessionId, {
results,
pageSize,
currentPage: 1,
totalPages: Math.ceil(results.length / pageSize),
totalItems: results.length
});
const firstPageData = results.slice(0, pageSize);
return {
data: firstPageData,
pagination: {
currentPage: 1,
totalPages: Math.ceil(results.length / pageSize),
totalItems: results.length,
pageSize,
hasNext: results.length > pageSize,
hasPrevious: false
}
};
}
// 获取下一页
export function getNextPage(sessionId = 'default') {
const state = paginationStates.get(sessionId);
if (!state) {
throw new Error(`没有找到分页状态，请先执行查询${Object.keys(paginationStates)}`);
}
if (state.currentPage >= state.totalPages) {
return {
data: [],
pagination: {
currentPage: state.currentPage,
totalPages: state.totalPages,
totalItems: state.totalItems,
pageSize: state.pageSize,
hasNext: false,
hasPrevious: state.currentPage > 1,
message: '已经是最后一页'
}
};
}
state.currentPage++;
const startIndex = (state.currentPage - 1) * state.pageSize;
const endIndex = startIndex + state.pageSize;
const pageData = state.results.slice(startIndex, endIndex);
return {
data: pageData,
pagination: {
currentPage: state.currentPage,
totalPages: state.totalPages,
totalItems: state.totalItems,
pageSize: state.pageSize,
hasNext: state.currentPage < state.totalPages,
hasPrevious: state.currentPage > 1
}
};
}
// 获取上一页
export function getPreviousPage(sessionId = 'default') {
const state = paginationStates.get(sessionId);
if (!state) {
throw new Error('没有找到分页状态，请先执行查询');
}
if (state.currentPage <= 1) {
return {
data: [],
pagination: {
currentPage: state.currentPage,
totalPages: state.totalPages,
totalItems: state.totalItems,
pageSize: state.pageSize,
hasNext: state.currentPage < state.totalPages,
hasPrevious: false,
message: '已经是第一页'
}
};
}
state.currentPage--;
const startIndex = (state.currentPage - 1) * state.pageSize;
const endIndex = startIndex + state.pageSize;
const pageData = state.results.slice(startIndex, endIndex);
return {
data: pageData,
pagination: {
currentPage: state.currentPage,
totalPages: state.totalPages,
totalItems: state.totalItems,
pageSize: state.pageSize,
hasNext: state.currentPage < state.totalPages,
hasPrevious: state.currentPage > 1
}
};
}
// 跳转到指定页
export function goToPage(pageNumber, sessionId = 'default') {
const state = paginationStates.get(sessionId);
if (!state) {
throw new Error('没有找到分页状态，请先执行查询');
}
if (pageNumber < 1 || pageNumber > state.totalPages) {
throw new Error(`页码超出范围，有效范围: 1-${state.totalPages}`);
}
state.currentPage = pageNumber;
const startIndex = (pageNumber - 1) * state.pageSize;
const endIndex = startIndex + state.pageSize;
const pageData = state.results.slice(startIndex, endIndex);
return {
data: pageData,
pagination: {
currentPage: pageNumber,
totalPages: state.totalPages,
totalItems: state.totalItems,
pageSize: state.pageSize,
hasNext: pageNumber < state.totalPages,
hasPrevious: pageNumber > 1
}
};
}
// 清除分页状态
export function clearPaginationState(sessionId = 'default') {
paginationStates.delete(sessionId);
}
// 获取分页状态信息
export function getPaginationInfo(sessionId = 'default') {
const state = paginationStates.get(sessionId);
if (!state) {
return null;
}
return {
currentPage: state.currentPage,
totalPages: state.totalPages,
totalItems: state.totalItems,
pageSize: state.pageSize,
hasNext: state.currentPage < state.totalPages,
hasPrevious: state.currentPage > 1
};
}