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annotate react_games/src/API_works/pagination.tsx @ 71:75de5903355c

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Giagantic changes that update Dowa library to be more align with stb style array and hashmap. Updated Seobeo to be caching on server side instead of file level caching. Deleted bunch of things I don't really use.
author June Park <parkjune1995@gmail.com>
date Sun, 28 Dec 2025 20:34:22 -0800
parents fb9bcd3145cb
children
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fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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1 import { CSSProperties, startTransition, useCallback, useEffect, useReducer, useRef } from "react";
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2 import ReactDOM from "react-dom/client";
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3
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4 const API_URL = "https://swapi.py4e.com/api/people/";
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5
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6 /* ---------- Types ---------- */
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7 interface PeopleJSON { name: string; birth_year: string; }
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8 interface APIResponse { next: string | null; previous: string | null; results: PeopleJSON[]; }
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9 interface PageData extends APIResponse { isLoading: boolean; curr: string; }
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10
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11 type Dir = "next" | "prev";
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12 type Mode = "none" | "page" | "offset" | "cursor" | "link";
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13 type UrlParams =
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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14 | { mode: "none" }
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15 | { mode: "page"; page: number; limit?: number }
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16 | { mode: "offset"; offset: number; limit?: number }
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17 | { mode: "cursor"; cursor: string; limit?: number; dir?: Dir }
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18 | { mode: "link"; curr: string; next?: string; prev?: string };
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19
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20 /* ---------- URL <-> Args ---------- */
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21 function parseArgsFromSearch(): UrlParams {
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22 const sp = new URLSearchParams(location.search);
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23 const mode = (sp.get("mode") as Mode) || "none";
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24 switch (mode) {
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25 case "none": return { mode };
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26 case "page": return { mode, page: Number(sp.get("page") || 1), limit: sp.get("limit") ? Number(sp.get("limit")) : undefined };
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27 case "offset": return { mode, offset: Number(sp.get("offset") || 0), limit: sp.get("limit") ? Number(sp.get("limit")) : undefined };
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28 case "cursor": return { mode, cursor: sp.get("cursor") || "", limit: sp.get("limit") ? Number(sp.get("limit")) : undefined, dir: (sp.get("dir") as Dir) || undefined };
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29 case "link": return { mode, curr: sp.get("curr") || API_URL, next: sp.get("next") || undefined, prev: sp.get("prev") || undefined };
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30 }
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31 }
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32
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33 function uiUrl(basePath: string, args: UrlParams): string {
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34 const sp = new URLSearchParams();
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35 switch (args.mode) {
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36 case "none":
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37 return basePath;
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38 case "page":
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39 sp.set("mode", "page");
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40 sp.set("page", String(args.page));
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41 if (args.limit != null) sp.set("limit", String(args.limit));
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42 break;
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43 case "offset":
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44 sp.set("mode", "offset");
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45 sp.set("offset", String(args.offset));
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46 if (args.limit != null) sp.set("limit", String(args.limit));
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47 break;
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48 case "cursor":
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49 sp.set("mode", "cursor");
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50 sp.set("cursor", args.cursor);
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51 if (args.limit != null) sp.set("limit", String(args.limit));
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52 if (args.dir) sp.set("dir", args.dir);
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53 break;
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54 case "link":
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55 sp.set("mode", "link");
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56 sp.set("curr", args.curr);
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57 if (args.next) sp.set("next", args.next);
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58 if (args.prev) sp.set("prev", args.prev);
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59 break;
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60 }
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61 const q = sp.toString();
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62 return q ? `${basePath}?${q}` : basePath;
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63 }
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64
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65 /** For this API, upstream URL comes from args. */
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66 function toUpstreamUrl(args: UrlParams): string {
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67 switch (args.mode) {
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68 case "none": return API_URL;
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69 case "link": return args.curr || API_URL;
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70 case "page": return `${API_URL}?page=${args.page}${args.limit != null ? `&limit=${args.limit}` : ""}`;
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71 case "offset": return `${API_URL}?offset=${args.offset}${args.limit != null ? `&limit=${args.limit}` : ""}`;
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72 case "cursor": return `${API_URL}?cursor=${args.cursor}${args.limit != null ? `&limit=${args.limit}` : ""}${args.dir ? `&dir=${args.dir}` : ""}`;
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73 }
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74 }
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75
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76 function argsFromResponse(currUrl: string, resp: APIResponse): UrlParams {
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77 // Prefer LINK mode when API provides next/previous URLs
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78 return { mode: "link", curr: currUrl, next: resp.next ?? undefined, prev: resp.previous ?? undefined };
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79 }
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80
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81 /* ---------- In-flight dedupe (not a cache) ---------- */
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82 const inflight = new Map<string, Promise<PageData>>();
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83
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84 async function fetchPage(url: string, signal?: AbortSignal): Promise<PageData> {
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85 if (inflight.has(url)) return inflight.get(url)!;
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86
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87 const p = (async () => {
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88 const res = await fetch(url, { signal });
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89 console.log(res.headers.get("content-type"));
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90 if (!res.ok) throw new Error(`HTTP ${res.status}`);
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91 const json: APIResponse = await res.json();
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92 return { ...json, isLoading: false, curr: url } as PageData;
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93 })().finally(() => inflight.delete(url));
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94
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95 inflight.set(url, p);
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96 return p;
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97 }
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98
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99 /* ---------- Derive next/prev target args (mode-agnostic) ---------- */
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100 function deriveNav(current: UrlParams, pd: PageData) {
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101 let nextArgs: UrlParams | undefined;
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102 let prevArgs: UrlParams | undefined;
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103
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104 switch (current.mode) {
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105 case "none":
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106 case "link": {
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107 nextArgs = pd.next ? { mode: "link", curr: pd.next, next: pd.next, prev: pd.prev || undefined } : undefined;
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108 prevArgs = pd.previous ? { mode: "link", curr: pd.previous, prev: pd.previous, next: pd.next || undefined } : undefined;
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109 break;
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110 }
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111 case "page": {
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112 const limit = current.limit;
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113 nextArgs = { mode: "page", page: current.page + 1, limit };
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114 prevArgs = current.page > 1 ? { mode: "page", page: current.page - 1, limit } : undefined;
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115 break;
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116 }
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117 case "offset": {
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118 const limit = current.limit ?? 10;
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119 nextArgs = { mode: "offset", offset: current.offset + limit, limit };
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120 prevArgs = current.offset - limit >= 0 ? { mode: "offset", offset: current.offset - limit, limit } : undefined;
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121 break;
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122 }
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123 case "cursor": {
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124 // needs server-provided cursors; we’d stash them in pd if available
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125 // For this API we don't have cursors, so fall back to link behavior above.
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126 break;
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127 }
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128 }
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129 return { nextArgs, prevArgs };
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130 }
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131
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132 /* ---------- State ---------- */
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133 enum ActionType { HYDRATE, LOADING, ERROR }
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134 type Action =
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135 | { type: ActionType.HYDRATE; data: PageData }
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136 | { type: ActionType.LOADING }
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137 | { type: ActionType.ERROR; error: string };
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138
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139 const INITIAL: PageData = { next: null, previous: null, results: [], isLoading: false, curr: API_URL };
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140
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141 function reducer(state: PageData, action: Action): PageData {
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142 switch (action.type) {
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143 case ActionType.HYDRATE: return action.data;
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144 case ActionType.LOADING: return { ...state, isLoading: true };
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145 case ActionType.ERROR: return { ...state, isLoading: false };
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146 default: return state;
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MrJuneJune <me@mrjunejune.com>
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147 }
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MrJuneJune <me@mrjunejune.com>
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148 }
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149
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150 /* ---------- Styles & Row ---------- */
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151 const styles: { row: CSSProperties; toolbar: CSSProperties } = {
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152 row: { display: "grid", gridTemplateColumns: "repeat(2, 1fr)" },
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153 toolbar: { display: "flex", gap: 8, marginBottom: 8 },
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154 };
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155
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156 const PersonRow = ({ p }: { p: PeopleJSON }) => (
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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157 <div style={styles.row}>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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158 <p>{p.name}</p>
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MrJuneJune <me@mrjunejune.com>
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159 <p>{p.birth_year}</p>
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MrJuneJune <me@mrjunejune.com>
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160 </div>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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161 );
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MrJuneJune <me@mrjunejune.com>
parents:
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162
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MrJuneJune <me@mrjunejune.com>
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163 /* ---------- Component ---------- */
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MrJuneJune <me@mrjunejune.com>
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164 const People = () => {
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MrJuneJune <me@mrjunejune.com>
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165 const [page, dispatch] = useReducer(reducer, INITIAL);
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166 const ctrlRef = useRef<AbortController | null>(null);
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167
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168 const load = useCallback((args: UrlParams, pushUrl = true) => {
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169 dispatch({ type: ActionType.LOADING });
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170
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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171 startTransition(async () => {
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172 ctrlRef.current?.abort();
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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173 const ctrl = new AbortController();
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MrJuneJune <me@mrjunejune.com>
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174 ctrlRef.current = ctrl;
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175
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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176 try {
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177 const upstream = toUpstreamUrl(args);
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178 const data = await fetchPage(upstream, ctrl.signal);
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179
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180 // Auto-detect LINK and sync UI URL *from the response* (URL is the source of truth)
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181 const linkArgs = argsFromResponse(upstream, data);
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parents:
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182 if (pushUrl) history.pushState(null, "", uiUrl(location.pathname, linkArgs));
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parents:
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183
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184 dispatch({ type: ActionType.HYDRATE, data });
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parents:
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185 } catch (e: any) {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
186 if (e?.name !== "AbortError") dispatch({ type: ActionType.ERROR, error: String(e?.message ?? e) });
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parents:
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187 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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188 });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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189 }, []);
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parents:
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190
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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191 // Initial load + back/forward
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192 useEffect(() => {
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193 const applyFromLocation = () => load(parseArgsFromSearch(), false);
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parents:
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194 window.addEventListener("popstate", applyFromLocation);
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195 applyFromLocation();
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196 return () => window.removeEventListener("popstate", applyFromLocation);
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197 }, [load]);
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198
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199 // Click handlers: derive target solely from current URL + current page data
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parents:
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200 const navigate = useCallback((dir: Dir) => {
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parents:
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201 const current = parseArgsFromSearch();
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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parents:
diff changeset
202 const { nextArgs, prevArgs } = deriveNav(current, page);
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parents:
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203 const target = dir === "next" ? nextArgs : prevArgs;
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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parents:
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204 if (!target) return;
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parents:
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205 // push new URL first so URL remains the source of truth
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parents:
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206 history.pushState(null, "", uiUrl(location.pathname, target));
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parents:
diff changeset
207 load(target, false); // do not push again inside load
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parents:
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208 }, [page, load]);
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parents:
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209
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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parents:
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210 const { nextArgs, prevArgs } = deriveNav(parseArgsFromSearch(), page);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
211
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
212 return (
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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213 <div>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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214 <div style={styles.toolbar}>
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
215 <button disabled={!prevArgs} onClick={() => navigate("prev")}>prev</button>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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216 <button disabled={!nextArgs} onClick={() => navigate("next")}>next</button>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
217 </div>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
218
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
219 {page.isLoading && <p>Loading…</p>}
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
220
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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221 {!page.isLoading && (
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
222 <>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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223 <div style={{ ...styles.row, borderBottom: "1px solid #000" }}>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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224 <strong>Name</strong>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
225 <strong>Birth Year</strong>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
226 </div>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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227 {page.results.map((p) => <PersonRow key={p.name} p={p} />)}
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
228 </>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
229 )}
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
230 </div>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
231 );
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
232 };
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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233
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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234 export {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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235 People,
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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236 }