質問編集履歴
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@@ -54,45 +54,155 @@
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```Pagination
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import React from 'react';
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import
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import PropTypes from 'prop-types';
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import { BrowserRouter, Route, Link } from 'react-router-dom'
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class App extends React.Component {
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const propTypes = {
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items: PropTypes.array.isRequired,
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onChangePage: PropTypes.func.isRequired,
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initialPage: PropTypes.number,
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pageSize: PropTypes.number,
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currentPage: PropTypes.number
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}
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const defaultProps = {
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initialPage: 1,
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pageSize: 10
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}
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class Pagination extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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this.state = { pager: {} };
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const reg = /\d+$/;
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const url = String(location.href)
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const notInitialPage = reg.test(url)
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// currentPage = url.match(reg)[0]
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// console.log(currentPage)
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}
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componentWillMount() {
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// set page if items array isn't empty
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if (this.props.items && this.props.items.length) {
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this.setPage(this.props.initialPage);
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}
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}
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componentDidUpdate(prevProps, prevState) {
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//
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// reset page if items array has changed
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if (this.props.items !== prevProps.items) {
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this.setPage(this.props.initialPage);
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}
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}
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setPage(page) {
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var { items, pageSize } = this.props;
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var pager = this.state.pager;
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if (page < 1 || page > pager.totalPages) {
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return;
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}
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// get new pager object for specified page
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pager = this.getPager(items.length, page, pageSize);
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// get new page of items from items array
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var pageOfItems = items.slice(pager.startIndex, pager.endIndex + 1);
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// update state
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this.setState({ pager: pager });
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// call change page function in parent component
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this.props.onChangePage(pageOfItems);
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}
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getPager(totalItems, currentPage, pageSize) {
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// default to first page
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currentPage = currentPage || 1;
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// default page size is 10
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pageSize = pageSize || 10;
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// calculate total pages
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var totalPages = Math.ceil(totalItems / pageSize);
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var startPage, endPage;
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if (totalPages <= 10) {
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// less than 10 total pages so show all
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startPage = 1;
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endPage = totalPages;
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} else {
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// more than 10 total pages so calculate start and end pages
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if (currentPage <= 6) {
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startPage = 1;
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endPage = 10;
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} else if (currentPage + 4 >= totalPages) {
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startPage = totalPages - 9;
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endPage = totalPages;
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} else {
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startPage = currentPage - 5;
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endPage = currentPage + 4;
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}
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}
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// calculate start and end item indexes
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var startIndex = (currentPage - 1) * pageSize;
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var endIndex = Math.min(startIndex + pageSize - 1, totalItems - 1);
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// create an array of pages to ng-repeat in the pager control
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var pages = [...Array((endPage + 1) - startPage).keys()].map(i => startPage + i);
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// return object with all pager properties required by the view
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return {
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totalItems: totalItems,
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currentPage: currentPage,
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pageSize: pageSize,
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totalPages: totalPages,
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startPage: startPage,
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endPage: endPage,
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startIndex: startIndex,
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endIndex: endIndex,
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pages: pages
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};
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}
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render() {
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var pager = this.state.pager;
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if (!pager.pages || pager.pages.length <= 1) {
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// don't display pager if there is only 1 page
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return null;
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}
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return (
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<
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<BrowserRouter>
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<ul className="pagination">
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<li className={pager.currentPage === 1 ? 'disabled' : ''}>
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{this.state.pageOfItems.map(item =>
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<a onClick={() => this.setPage(1)}>First</a>
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</li>
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<li className={pager.currentPage === 1 ? 'disabled' : ''}>
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<a onClick={() => this.setPage(pager.currentPage - 1)}>Previous</a>
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</li>
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{pager.pages.map((page, index) =>
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<li key={index} className={pager.currentPage === page ? 'active' : ''}>
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<Link to={page.toString()} onClick={() => this.setPage(page)}>{page}</Link>
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</li>
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)}
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<li className={pager.currentPage === pager.totalPages ? 'disabled' : ''}>
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<a onClick={() => this.setPage(pager.currentPage + 1)}>Next</a>
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</li>
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<li className={pager.currentPage === pager.totalPages ? 'disabled' : ''}>
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<a onClick={() => this.setPage(pager.totalPages)}>Last</a>
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</
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</li>
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</
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</ul>
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</BrowserRouter>
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);
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}
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}
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Pagination.propTypes = propTypes;
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Pagination.defaultProps = defaultProps;
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export default
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export default Pagination;
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```
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```index
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