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annotate react_games/src/API_works/pagination_2.tsx @ 60:d64a8c189a77

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author June Park <me@mrjunejune.com>
date Sat, 20 Dec 2025 13:56:01 -0500
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, useCallback, useEffect, useRef, useState } from "react";
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2
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3 interface PersonJson {
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4 name: string;
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5 height: string;
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6 mass: string;
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7 hair_color: string;
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8 skin_color: string;
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9 eye_color: string;
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10 birth_year: string;
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11 gender: string;
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12 homeworld: string;
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13 films: string[];
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14 species: string;
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15 vehicles: string[];
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16 starships: string[];
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17 created: string;
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18 edited: string;
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19 url: string;
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20 }
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21
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22 interface Person extends PersonJson {}
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23
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24 interface APIResponse {
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25 next: string | null;
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26 previous: string | null;
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27 results: PersonJson[];
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28 }
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29
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30 interface PageData extends APIResponse {
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31 curr: string;
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32 }
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33
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34 const BASE_URL = "https://swapi.py4e.com/api/people/";
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35
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36 const cacheMap: Map<string, Promise<PageData>> = new Map()
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37
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38 const getPeople = async (
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39 url: string,
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40 signal: AbortSignal,
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41 ): Promise<PageData> => {
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42 const cacheValue = cacheMap.get(url);
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43 if (cacheValue) return cacheValue;
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44
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45 const response = await fetch(url, { signal });
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46 if (!response.ok) throw new Error("Server Error");
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47 const pageData = await response.json();
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48
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49 cacheMap.set(url, pageData);
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50 return { ...pageData, curr: url };
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51 }
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52
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53 interface PersonRowProp {
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54 person: Person;
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55 }
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56
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57 interface StylesProp {
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58 row: CSSProperties,
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59 }
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60
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61 const styles: StylesProp = {
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62 row: {
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63 display: "flex",
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64 justifyContent: "space-between",
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65 borderBottom: "1px solid black",
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66 marginBottom: 10
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67 }
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68 }
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69
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70 const PersonRow = ({person}: PersonRowProp) => {
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71 return (
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72 <div style={styles.row}>
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73 <p>{ person.name }</p>
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74 <p>{ person.birth_year }</p>
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75 </div>
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76 )
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77 }
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78
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79 const constructSearchParam = (pageData: PageData) => {
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80 const sp = new URLSearchParams();
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81 if (pageData.next) {
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82 sp.set("next", pageData.next)
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83 }
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84 if (pageData.previous) {
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85 sp.set("previous", pageData.previous)
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86 }
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87 sp.set("curr", pageData.curr)
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88 return sp;
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89 }
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90
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91 const constructUrl = (url: string, sp: URLSearchParams) => {
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92 return `${url}?${sp.toString()}`
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93 }
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94
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95 type Direction = "next" | "previous"
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96
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97 type APIType = "page" | "offset" | "cursor" | "link"
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98
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99 const constructUrlFromSP = (apiType: APIType, sp: URLSearchParams): string | null => {
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100 switch(apiType) {
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101 case "page":
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102 case "offset":
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103 case "cursor":
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104 return `${BASE_URL}?${sp.toString()}`
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105 case "link":
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106 return sp.get("curr");
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107 }
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108 }
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109
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110 const updateSP = (
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111 apiType: APIType,
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112 direction: Direction,
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113 sp: URLSearchParams
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114 ) => {
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115 switch(apiType) {
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116 case "page":
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117 sp.set(
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118 "page",
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119 direction === "next" ?
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120 String(Number(sp.get("page") as string) + 1) :
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121 String(Math.max(Number(sp.get("page") as string) - 1, 1))
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122 );
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123 return sp;
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124 case "offset":
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125 sp.set("offset",
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126 direction === "next" ?
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127 String(Number(sp.get("offset") as string) + Number(sp.get("offset") as string)) :
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128 String(Number(sp.get("offset") as string) - Math.min(Number(sp.get("offset") as string)))
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129 );
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130 return sp;
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131 case "cursor":
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132 // TODO get id from people:
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133 return sp;
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134 case "link":
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135 const curr = sp.get("curr") as string;
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136 const next = sp.get("next");
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137 const previous = sp.get("previous");
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138 if (direction === "next") {
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139 sp.delete("next");
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140 if (next) {
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141 sp.set("curr", next);
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142 }
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143 sp.set("previous", curr);
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144 } else {
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145 sp.delete("previous");
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146 if (previous) {
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147 sp.set("curr", previous);
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148 }
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149 sp.set("next", curr);
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150 }
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151 sp.set("offset", String(Number(sp.get("offset")) as number + 1));
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152 return sp;
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153 }
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154 }
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155
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156 const usePageData = (api: APIType) => {
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157 const [apiType] = useState<APIType>(api);
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158 const [people, setPeople] = useState<Person[]>([]);
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159 const [hasNext, setHasNext] = useState(true);
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160 const [hasPrevious, setHasPrevious] = useState(true);
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161 const abortRef = useRef<AbortController | null>(null);
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162
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163 /** Single path for: fetch -> set state -> reflect URL */
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164 const load = useCallback(async (url: string, replace = false) => {
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165 // cancel any prior request
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166 abortRef.current?.abort();
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167 const ac = new AbortController();
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168 abortRef.current = ac;
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169
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170 const page = await getPeople(url, ac.signal);
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171
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172 // state
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173 setPeople(page.results);
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174
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175 if (apiType === "link") {
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176 const sp = constructSearchParam(page);
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177 setHasNext(Boolean(page.next));
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178 setHasPrevious(Boolean(page.previous));
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179 const target = `${location.pathname}?${sp.toString()}`;
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180 replace ? history.replaceState(null, "", target) : history.pushState(null, "", target);
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181 } else {
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182 const sp = new URL(url).searchParams;
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183 const target = `${location.pathname}?${sp.toString()}`;
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184 replace ? history.replaceState(null, "", target) : history.pushState(null, "", target);
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185 }
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186 }, [apiType]);
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187
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188 // Initial hydrate: reuse load()
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189 useEffect(() => {
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190 const sp = new URLSearchParams(location.search);
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191 const url = constructUrlFromSP(apiType, sp) ?? BASE_URL;
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192 load(url, /* replace */ true);
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193 return () => abortRef.current?.abort();
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194 }, [apiType, load]);
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195
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196 // Button handler: reuse load()
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197 const handleOnClick = useCallback((direction: Direction) => {
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198 const sp = new URLSearchParams(location.search);
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199 const nextSP = updateSP(apiType, direction, sp);
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200 const nextUrl = constructUrlFromSP(apiType, nextSP);
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201 if (nextUrl) load(nextUrl);
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202 }, [apiType, load]);
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203
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204 return { people, hasNext, hasPrevious, handleOnClick };
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205 };
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206
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207 const PageTableComponent = () => {
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208 const {hasNext, hasPrevious, people, handleOnClick} = usePageData("link");
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209 return (
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210 <>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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211 <div style={{...styles.row, width: "30%", borderBottom: "none" }}>
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212 <button disabled={!hasNext} onClick={() => handleOnClick("next")}> Next </button>
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213 <button disabled={!hasPrevious} onClick={() => handleOnClick("previous")}> Previous </button>
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214 </div>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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215 <div style={styles.row}>
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216 <p>Name</p>
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217 <p>Birth_year</p>
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218 </div>
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219 {people.map((person) => (<PersonRow person={person} />) )}
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220 </>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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221 )
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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222 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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223
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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224 export {
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225 PageTableComponent,
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226 }