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annotate react_games/src/API_works/pagination.tsx @ 176:fed99fc04e12 hg-web

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[HgWeb] Problem with the emscript lol
author MrJuneJune <me@mrjunejune.com>
date Wed, 21 Jan 2026 19:32:08 -0800
parents fb9bcd3145cb
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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1 import { CSSProperties, startTransition, useCallback, useEffect, useReducer, useRef } from "react";
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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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" }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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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
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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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) {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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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;
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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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;
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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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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147 }
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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>
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MrJuneJune <me@mrjunejune.com>
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161 );
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MrJuneJune <me@mrjunejune.com>
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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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MrJuneJune <me@mrjunejune.com>
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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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185 } catch (e: any) {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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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 }
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MrJuneJune <me@mrjunejune.com>
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188 });
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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189 }, []);
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190
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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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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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200 const navigate = useCallback((dir: Dir) => {
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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;
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204 if (!target) return;
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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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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>
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MrJuneJune <me@mrjunejune.com>
parents:
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216 <button disabled={!nextArgs} onClick={() => navigate("next")}>next</button>
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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:
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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:
diff changeset
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:
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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:
diff changeset
234 export {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
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 }