Reactアプリのユーザーログインとログアウト実装手法

reactのユーザーログインとログアウト はじめに 前回のガイドでparseでユーザー登録を処理するコンポーネントを実装した後、今回は同じ parse user parse user クラスを使用してユーザーをログインおよびログアウトする方法を学びます。 この parse user login parse user login メソッドは、ローカルストレージに有効なユーザーセッションを保存するため、今後 current current のようなメソッドを呼び出すと、ユーザーデータを正常に取得できます。一方、 logout logout はこのセッションをディスクからクリアし、parseサーバーのリンクされたサービスからログアウトします。 前提条件 このチュートリアルを完了するには、次のものが必要です 作成されたreactアプリと back4appに接続されている 前のガイドを完了して、 parse userクラス についてより良い理解を得てください。 このガイドで提供される画面レイアウトをテスト/使用したい場合は、 ant design ant design ライブラリを設定する必要があります。 目標 reactアプリ用にparseを使用してユーザーログインとログアウト機能を構築します。 1 loginおよびlogoutメソッドの理解 parseユーザー管理は、 parse user parse user オブジェクトタイプを使用し、デフォルトの parseobject parseobject タイプを拡張し、 current current や getusername getusername ,などのユニークなヘルパーメソッドを含んでいます。これにより、アプリ全体でユーザーデータを取得するのに役立ちます。 parse user parse user オブジェクトについては、 公式ドキュメントでこちらをご覧ください https //parseplatform org/parse sdk js/api/master/parse user html 。 このガイドでは、 login login と logout logout メソッドを使用して、ユーザーログインプロセスを処理し、ユーザーデータをローカルに保存する方法を学びます。 2 ログインコンポーネントの作成 では、アプリに userlogin userlogin コンポーネントを構築しましょう。 src src ディレクトリに userlogin js userlogin js という新しいファイルを作成します（ userlogin tsx userlogin tsx を使用している場合）そして、状態フックを使用してデータを管理する入力要素を追加します。現在ログインしているユーザーで状態変数を更新する責任を持つ関数もあることに注意してください。これは後で使用します userlogin js 1 import react, { usestate } from 'react'; 2 import parse from 'parse/dist/parse min js'; 3 import ' /app css'; 4 import { button, divider, input } from 'antd'; 5&#x9; 6 export const userlogin = () => { 7 // state variables 8 const \[username, setusername] = usestate(''); 9 const \[password, setpassword] = usestate(''); 10 const \[currentuser, setcurrentuser] = usestate(null); 11&#x9; 12 // function that will return current user and also update current username 13 const getcurrentuser = async function () { 14 const currentuser = await parse user current(); 15 // update state variable holding current user 16 setcurrentuser(currentuser); 17 return currentuser; 18 }; 19&#x9; 20 return ( 21 \<div> 22 \<div classname="header"> 23 \<img 24 classname="header logo" 25 alt="back4app logo" 26 src={ 27 'https //blog back4app com/wp content/uploads/2019/05/back4app white logo 500px png' 28 } 29 /> 30 \<p classname="header text bold">{'react on back4app'}\</p> 31 \<p classname="header text">{'user login'}\</p> 32 \</div> 33 \<div classname="container"> 34 \<h2 classname="heading">{'user login'}\</h2> 35 \<divider /> 36 \<div classname="form wrapper"> 37 \<input 38 value={username} 39 onchange={(event) => setusername(event target value)} 40 placeholder="username" 41 size="large" 42 classname="form input" 43 /> 44 \<input 45 value={password} 46 onchange={(event) => setpassword(event target value)} 47 placeholder="password" 48 size="large" 49 type="password" 50 classname="form input" 51 /> 52 \</div> 53 \<div classname="form buttons"> 54 \<button 55 onclick={() => douserlogin()} 56 type="primary" 57 classname="form button" 58 color={'#208aec'} 59 size="large" 60 block 61 > 62 log in 63 \</button> 64 \</div> 65 \<divider /> 66 \<div classname="login social"> 67 \<div classname="login social item login social item facebook"> 68 \<img classname="login social item image" src={'https //findicons com/files/icons/2830/clean social icons/250/facebook png'} alt=""/> 69 \</div> 70 \<div classname="login social item"> 71 \<img classname="login social item image" src={'data\ image/png;base64,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'} alt=""/> 72 \</div> 73 \<div classname="login social item"> 74 \<img classname="login social item image" src={'data\ 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alt=""/> 75 \</div> 76 \</div> 77 \<p classname="form hint">don't have an account? \<a classname="form link" href="#">sign up\</a>\</p> 78 \</div> 79 \</div> 80 ); 81 }; userlogin tsx 1 import react, { usestate, fc, reactelement } from 'react'; 2 import ' /app css'; 3 import { button, divider, input } from 'antd'; 4 const parse = require('parse/dist/parse min js'); 5&#x9; 6 export const userlogin fc<{}> = () reactelement => { 7 // state variables 8 const \[username, setusername] = usestate(''); 9 const \[password, setpassword] = usestate(''); 10 const \[currentuser, setcurrentuser] = usestate\<parse object | null>(null); 11&#x9; 12 // function that will return current user and also update current username 13 const getcurrentuser = async function () promise\<parse user | null> { 14 const currentuser (parse user | null) = await parse user current(); 15 // update state variable holding current user 16 setcurrentuser(currentuser); 17 return currentuser; 18 } 19&#x9; 20 return ( 21 \<div> 22 \<div classname="header"> 23 \<img 24 classname="header logo" 25 alt="back4app logo" 26 src={ 27 'https //blog back4app com/wp content/uploads/2019/05/back4app white logo 500px png' 28 } 29 /> 30 \<p classname="header text bold">{'react on back4app'}\</p> 31 \<p classname="header text">{'user login'}\</p> 32 \</div> 33 \<div classname="container"> 34 \<h2 classname="heading">{'user login'}\</h2> 35 \<divider /> 36 \<div classname="form wrapper"> 37 \<input 38 value={username} 39 onchange={(event) => setusername(event target value)} 40 placeholder="username" 41 size="large" 42 classname="form input" 43 /> 44 \<input 45 value={password} 46 onchange={(event) => setpassword(event target value)} 47 placeholder="password" 48 size="large" 49 type="password" 50 classname="form input" 51 /> 52 \</div> 53 \<div classname="form buttons"> 54 \<button 55 onclick={() => douserlogin()} 56 type="primary" 57 classname="form button" 58 color={'#208aec'} 59 size="large" 60 block 61 > 62 log in 63 \</button> 64 \</div> 65 \<divider /> 66 \<div classname="login social"> 67 \<div classname="login social item login social item facebook"> 68 \<img classname="login social item image" src={'https //findicons com/files/icons/2830/clean social icons/250/facebook png'} alt=""/> 69 \</div> 70 \<div classname="login social item"> 71 \<img classname="login social item image" src={'data\ image/png;base64,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'} alt=""/> 72 \</div> 73 \<div classname="login social item"> 74 \<img classname="login social item image" src={'data\ image/png;base64,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'} alt=""/> 75 \</div> 76 \</div> 77 \<p classname="form hint">don't have an account? \<a classname="form link" href="#">sign up\</a>\</p> 78 \</div> 79 \</div> 80 ); 81 }; 今、状態変数を使用して、 parse user login parse user login メソッドを呼び出す関数を実装できます。 javascript 1 const douserlogin = async function () { 2 // note that these values come from state variables that we've declared before 3 const usernamevalue = username; 4 const passwordvalue = password; 5 try { 6 const loggedinuser = await parse user login(usernamevalue, passwordvalue); 7 // login returns the corresponding parseuser object 8 alert( 9 `success! user ${loggedinuser get( 10 'username' 11 )} has successfully signed in!` 12 ); 13 // to verify that this is in fact the current user, `current` can be used 14 const currentuser = await parse user current(); 15 console log(loggedinuser === currentuser); 16 // clear input fields 17 setusername(''); 18 setpassword(''); 19 // update state variable holding current user 20 getcurrentuser(); 21 return true; 22 } catch (error) { 23 // error can be caused by wrong parameters or lack of internet connection 24 alert(`error! ${error message}`); 25 return false; 26 } 27 };1 const douserlogin = async function () promise\<boolean> { 2 // note that these values come from state variables that we've declared before 3 const usernamevalue string = username; 4 const passwordvalue string = password; 5 try { 6 const loggedinuser parse user = await parse user login(usernamevalue, passwordvalue); 7 // login returns the corresponding parseuser object 8 alert( 9 `success! user ${loggedinuser get('username')} has successfully signed in!`, 10 ); 11 // to verify that this is in fact the current user, `current` can be used 12 const currentuser parse user = await parse user current(); 13 console log(loggedinuser === currentuser); 14 // clear input fields 15 setusername(''); 16 setpassword(''); 17 // update state variable holding current user 18 getcurrentuser(); 19 return true; 20 } catch (error any) { 21 // error can be caused by wrong parameters or lack of internet connection 22 alert(`error! ${error message}`); 23 return false; 24 } 25 }; この関数を userlogin userlogin コンポーネント内に挿入し、 return return 呼び出しの直前に配置して、呼び出してテストします。フォームのログインボタンの onclick onclick アクションを () => douserlogin() () => douserlogin() に更新することを忘れないでください。この画面レイアウトを完全にレンダリングしたい場合は、これらのクラスを app css app css ファイルに追加してください app css 1 @import ' antd/dist/antd css'; 2&#x9; 3 app { 4 text align center; 5 } 6&#x9; 7 html { 8 box sizing border box; 9 outline none; 10 overflow auto; 11 } 12&#x9; 13 , 14 before, 15 after { 16 margin 0; 17 padding 0; 18 box sizing inherit; 19 } 20&#x9; 21 h1, 22 h2, 23 h3, 24 h4, 25 h5, 26 h6 { 27 margin 0; 28 font weight bold; 29 } 30&#x9; 31 p { 32 margin 0; 33 } 34&#x9; 35 body { 36 margin 0; 37 background color #fff; 38 } 39&#x9; 40 container { 41 width 100%; 42 max width 900px; 43 margin auto; 44 padding 20px 0; 45 text align left; 46 } 47&#x9; 48 header { 49 align items center; 50 padding 25px 0; 51 background color #208aec; 52 } 53&#x9; 54 header logo { 55 height 55px; 56 margin bottom 20px; 57 object fit contain; 58 } 59&#x9; 60 header text bold { 61 margin bottom 3px; 62 color rgba(255, 255, 255, 0 9); 63 font size 16px; 64 font weight bold; 65 } 66&#x9; 67 header text { 68 color rgba(255, 255, 255, 0 9); 69 font size 15px; 70 } 71&#x9; 72 heading { 73 font size 22px; 74 } 75&#x9; 76 flex { 77 display flex; 78 } 79&#x9; 80 flex between { 81 display flex; 82 justify content space between; 83 } 84&#x9; 85 flex child { 86 flex 0 0 45%; 87 } 88&#x9; 89 heading button { 90 margin left 12px; 91 } 92&#x9; 93 list item { 94 padding bottom 15px; 95 margin bottom 15px; 96 border bottom 1px solid rgba(0, 0, 0, 0 06); 97 text align left; 98 } 99&#x9; 100 list item title { 101 color rgba(0, 0, 0, 0 87); 102 font size 17px; 103 } 104&#x9; 105 list item description { 106 color rgba(0, 0, 0, 0 5); 107 font size 15px; 108 } 109&#x9; 110 form input { 111 margin bottom 20px; 112 } 113&#x9; 114 login social { 115 display flex; 116 justify content center; 117 margin bottom 30px; 118 } 119&#x9; 120 login social item { 121 width 54px; 122 height 54px; 123 border radius 54px; 124 padding 12px; 125 margin 0 12px; 126 border 1px solid #e6e6e6; 127 box shadow 0 2px 4px #d6d6d6; 128 } 129&#x9; 130 login social item facebook { 131 padding 4px; 132 background color #3c5b9b; 133 } 134&#x9; 135 login social item image { 136 width 100%; 137 } 138&#x9; 139 form hint { 140 color rgba(0, 0, 0, 0 5); 141 font size 16px; 142 text align center; 143 } アプリケーションを実行し、このログインコンポーネントをメインアプリケーションファイルにインポートしてください。これと同じ画面が表示され、正しい資格情報でログインした後に成功メッセージも表示されるはずです。 3 ログインユーザーの確認 ユーザーがアプリケーションに正常にログインした後、彼はそれを知ることができ、アプリケーションからログアウトすることもできるはずです。まず、ログインフォームを隠し、ユーザー名を含むウェルカムメッセージをレンダリングしましょう。現在のユーザー名を保持する状態変数と一緒に条件演算子を使用することに注意してください。 userlogin js 1 // your imports 2 export const userlogin = () => { 3 // state variables and functions 4&#x9; 5 return ( 6 \<div> 7 \<div classname="header"> 8 \<img 9 classname="header logo" 10 alt="back4app logo" 11 src={ 12 'https //blog back4app com/wp content/uploads/2019/05/back4app white logo 500px png' 13 } 14 /> 15 \<p classname="header text bold">{'react on back4app'}\</p> 16 \<p classname="header text">{'user login'}\</p> 17 \</div> 18 {currentuser === null && ( 19 \<div classname="container"> 20 \<h2 classname="heading">{'user login'}\</h2> 21 \<divider /> 22 \<div classname="form wrapper"> 23 \<input 24 value={username} 25 onchange={(event) => setusername(event target value)} 26 placeholder="username" 27 size="large" 28 classname="form input" 29 /> 30 \<input 31 value={password} 32 onchange={(event) => setpassword(event target value)} 33 placeholder="password" 34 size="large" 35 type="password" 36 classname="form input" 37 /> 38 \</div> 39 \<div classname="form buttons"> 40 \<button 41 onclick={() => douserlogin()} 42 type="primary" 43 classname="form button" 44 color={'#208aec'} 45 size="large" 46 block 47 > 48 log in 49 \</button> 50 \</div> 51 \<divider /> 52 \<div classname="login social"> 53 \<div classname="login social item login social item facebook"> 54 \<img classname="login social item image" src={'https //findicons com/files/icons/2830/clean social icons/250/facebook png'} alt=""/> 55 \</div> 56 \<div classname="login social item"> 57 \<img classname="login social item image" src={'data\ image/png;base64,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'} alt=""/> 58 \</div> 59 \<div classname="login social item"> 60 \<img classname="login social item image" src={'data\ 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alt=""/> 61 \</div> 62 \</div> 63 \<p classname="form hint">don't have an account? \<a classname="form link" href="#">sign up\</a>\</p> 64 \</div> 65 )} 66 {currentuser !== null && 67 (\<div classname="container"> 68 \<h2 classname="heading">{'user screen'}\</h2> 69 \<divider /> 70 \<h2 classname="heading">{`hello ${currentuser get('username')}!`}\</h2> 71 \<div classname="form buttons"> 72 \<button 73 onclick={() => {}} 74 type="primary" 75 classname="form button" 76 color={'#208aec'} 77 size="large" 78 > 79 log out 80 \</button> 81 \</div> 82 \</div>) 83 } 84 \</div> 85 ); 86 }; userlogin tsx 1 // your imports 2 export const userlogin fc<{}> = () reactelement => { 3 // state variables and functions 4 5 return ( 6 \<div> 7 \<div classname="header"> 8 \<img 9 classname="header logo" 10 alt="back4app logo" 11 src={ 12 'https //blog back4app com/wp content/uploads/2019/05/back4app white logo 500px png' 13 } 14 /> 15 \<p classname="header text bold">{'react on back4app'}\</p> 16 \<p classname="header text">{'user login'}\</p> 17 \</div> 18 {currentuser === null && ( 19 \<div classname="container"> 20 \<h2 classname="heading">{'user login'}\</h2> 21 \<divider /> 22 \<div classname="form wrapper"> 23 \<input 24 value={username} 25 onchange={(event) => setusername(event target value)} 26 placeholder="username" 27 size="large" 28 classname="form input" 29 /> 30 \<input 31 value={password} 32 onchange={(event) => setpassword(event target value)} 33 placeholder="password" 34 size="large" 35 type="password" 36 classname="form input" 37 /> 38 \</div> 39 \<div classname="form buttons"> 40 \<button 41 onclick={() => douserlogin()} 42 type="primary" 43 classname="form button" 44 color={'#208aec'} 45 size="large" 46 block 47 > 48 log in 49 \</button> 50 \</div> 51 \<divider /> 52 \<div classname="login social"> 53 \<div classname="login social item login social item facebook"> 54 \<img classname="login social item image" src={'https //findicons com/files/icons/2830/clean social icons/250/facebook png'} alt=""/> 55 \</div> 56 \<div classname="login social item"> 57 \<img classname="login social item image" src={'data\ image/png;base64,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'} alt=""/> 58 \</div> 59 \<div classname="login social item"> 60 \<img classname="login social item image" src={'data\ image/png;base64,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'} alt=""/> 61 \</div> 62 \</div> 63 \<p classname="form hint">don't have an account? \<a classname="form link" href="#">sign up\</a>\</p> 64 \</div> 65 )} 66 {currentuser !== null && 67 (\<div classname="container"> 68 \<h2 classname="heading">{'user screen'}\</h2> 69 \<divider /> 70 \<h2 classname="heading">{`hello ${currentuser get('username')}!`}\</h2> 71 \<div classname="form buttons"> 72 \<button 73 onclick={() => {}} 74 type="primary" 75 classname="form button" 76 color={'#208aec'} 77 size="large" 78 > 79 log out 80 \</button> 81 \</div> 82 \</div>) 83 } 84 \</div> 85 ); 86 }; アプリを再度実行してください。アプリがユーザー画面とウェルカムメッセージをこのように表示することに注意してください 4 ログアウト機能の作成 ログアウト メソッドはログインよりも簡単です。 メソッドはログインよりも簡単です。 この parse user logout parse user logout メソッドは引数を取らず、 currentuser currentuser データを自動的にローカルに保存します。この関数を userlogin userlogin コンポーネントに作成し、 onclick onclick 属性でログアウトボタンを呼び出します userlogout js 1 const douserlogout = async function () { 2 try { 3 await parse user logout(); 4 // to verify that current user is now empty, currentasync can be used 5 const currentuser = await parse user current(); 6 if (currentuser === null) { 7 alert('success! no user is logged in anymore!'); 8 } 9 // update state variable holding current user 10 getcurrentuser(); 11 return true; 12 } catch (error) { 13 alert(`error! ${error message}`); 14 return false; 15 } 16 }; userlogout tsx 1 const douserlogout = async function () promise\<boolean> { 2 try { 3 await parse user logout(); 4 // to verify that current user is now empty, currentasync can be used 5 const currentuser parse user = await parse user current(); 6 if (currentuser === null) { 7 alert('success! no user is logged in anymore!'); 8 } 9 // update state variable holding current user 10 getcurrentuser(); 11 return true; 12 } catch (error any) { 13 alert(`error! ${error message}`); 14 return false; 15 } 16 }; 成功裏にログアウトを行うと、次のようなメッセージが表示されます ここに、前に示したすべての関数を含む完全なコンポーネントコードがあります userlogin js 1 import react, { usestate } from 'react'; 2 import parse from 'parse/dist/parse min js'; 3 import ' /app css'; 4 import { button, divider, input } from 'antd'; 5&#x9; 6 export const userlogin = () => { 7 // state variables 8 const \[username, setusername] = usestate(''); 9 const \[password, setpassword] = usestate(''); 10 const \[currentuser, setcurrentuser] = usestate(null); 11&#x9; 12 const douserlogin = async function () { 13 // note that these values come from state variables that we've declared before 14 const usernamevalue = username; 15 const passwordvalue = password; 16 try { 17 const loggedinuser = await parse user login(usernamevalue, passwordvalue); 18 // login returns the corresponding parseuser object 19 alert( 20 `success! user ${loggedinuser get( 21 'username' 22 )} has successfully signed in!` 23 ); 24 // to verify that this is in fact the current user, `current` can be used 25 const currentuser = await parse user current(); 26 console log(loggedinuser === currentuser); 27 // clear input fields 28 setusername(''); 29 setpassword(''); 30 // update state variable holding current user 31 getcurrentuser(); 32 return true; 33 } catch (error) { 34 // error can be caused by wrong parameters or lack of internet connection 35 alert(`error! ${error message}`); 36 return false; 37 } 38 }; 39&#x9; 40 const douserlogout = async function () { 41 try { 42 await parse user logout(); 43 // to verify that current user is now empty, currentasync can be used 44 const currentuser = await parse user current(); 45 if (currentuser === null) { 46 alert('success! no user is logged in anymore!'); 47 } 48 // update state variable holding current user 49 getcurrentuser(); 50 return true; 51 } catch (error) { 52 alert(`error! ${error message}`); 53 return false; 54 } 55 }; 56&#x9; 57 // function that will return current user and also update current username 58 const getcurrentuser = async function () { 59 const currentuser = await parse user current(); 60 // update state variable holding current user 61 setcurrentuser(currentuser); 62 return currentuser; 63 }; 64&#x9; 65 return ( 66 \<div> 67 \<div classname="header"> 68 \<img 69 classname="header logo" 70 alt="back4app logo" 71 src={ 72 'https //blog back4app com/wp content/uploads/2019/05/back4app white logo 500px png' 73 } 74 /> 75 \<p classname="header text bold">{'react on back4app'}\</p> 76 \<p classname="header text">{'user login'}\</p> 77 \</div> 78 {currentuser === null && ( 79 \<div classname="container"> 80 \<h2 classname="heading">{'user login'}\</h2> 81 \<divider /> 82 \<div classname="form wrapper"> 83 \<input 84 value={username} 85 onchange={(event) => setusername(event target value)} 86 placeholder="username" 87 size="large" 88 classname="form input" 89 /> 90 \<input 91 value={password} 92 onchange={(event) => setpassword(event target value)} 93 placeholder="password" 94 size="large" 95 type="password" 96 classname="form input" 97 /> 98 \</div> 99 \<div classname="form buttons"> 100 \<button 101 onclick={() => douserlogin()} 102 type="primary" 103 classname="form button" 104 color={'#208aec'} 105 size="large" 106 block 107 > 108 log in 109 \</button> 110 \</div> 111 \<divider /> 112 \<div classname="login social"> 113 \<div classname="login social item login social item facebook"> 114 \<img classname="login social item image" src={'https //findicons com/files/icons/2830/clean social icons/250/facebook png'} alt=""/> 115 \</div> 116 \<div classname="login social item"> 117 \<img classname="login social item image" src={'data\ image/png;base64,ivborw0kggoaaaansuheugaaan8aaadicamaaad5w+jtaaabwvbmvex////qqzu0qfnchft7vauufppk7f08gvr0o/zzofb7uqd7uadpncp/vqdqpzaspk7plhrpoysyoklpoyzpnst97ovwgnskpensxfh8wgavouhplrj+9/b0pad4xsoix5fd7+h74udvenlru0f61tt1r6vuc2vtzvvxiop5zsvpnjb93p4nefofrpeqxpnk5dbus2zt9u++0vtuvyfelfwq1rt2u7j86ejyl5hrsz7/9+x80nt94637xdx8yu//+/d93jb+785sjvwdu/j+9nzc1fvv9p7a5v1frmdl8+nd4spru34zqklohwd0qktwhnpwdjf1ly/5ssl82ibuzjjyidl3pyfswdjwezb1mi7vazn8zwh+68l7wjdq04okszlurkrfuig7tjkgsersq1dsusqateq4o31kk9pjnrq/qmrijuvjmcrho5uyzqvkmmtioqjbqhlesjcm1x3qaaaltuleqvr4no2c2x/a2bwafrnibattyiiwmnusm46begyczdy7ctc47iztdkbjdj1u09ad9v9/qcqeskdlbrpx4pfvys9y+nzovefcbxpcb0hrlh+en9cnzg/lrn+fhieto+nuo9pmlqzkbezpyqhrrzz1zporwm4ddwuilauakhpfb5uiuzyicblsbfsodlm/kysgwv6izihta3l4kkip1670khljvqwjyvooqm2biak1j7f3lb81nbkkap6rnalzpo5vrpbp2okqq3nbowpyiz6kvqa23fkx1dmlwak2jgozovtrkpmt1k5rjguyqk5ugsi3z1h7wrxoza1xqglgflqk8zq975ip3rpn6dkda+r5esfr54vsymd4mjcjtrmmhs6tlc1pshfmpstqnta3vbmo2zloiuw5thch0lmzkqsu6+fhw46kigqhynlasxpmslubr8kd0ba77fboztvyi/oqhtoocx4ossqhlldldnympxyuei2rylhwrmnwi9orlkhpm9uipahqyzvzxojgjirhzx8wz80lspn8z30kxca3l4haj7dexym1k5vsmvg9ceoysm0vsao2yjkzrbfizjedjbxojkt1crgzojeq1cs3d1ypyt/tjddybb0dh3seo8d14qdhmnqn+bugktgb7hzzp45du0y0er2ytdseo3e+28njxcrovwdbvq8rt8pavq8st7mfrf6l9nwi5hrnewtbvh4mcbrs9r/ceuuh5aafmnpkktbjt+7ojnqtvr3e6h2d3xu7ykkgur8vgr65wacicjn/3pi8nijxzyyfsntohpxoiaw+uzhfbtjvwhkr0iyf3b8grhdiyvapcqecujn+fhd8f4awhtfbxvkjgjkboiaotxtf/vwitrlhidtfuybwrhbu8l5rqjp6zcy+tjq7iefl9bbh2slp6hftrowus6h2jvx25gkv6ehxpazsfaqybwotgit9iothtdwkrmdt/exzz6xk9e4wrh+h4/9yfplc5pxk6bsuoxjn/z0lf40e10vuziq2wbsbzfoooai99m6f6hevzx71r6dh5rfrgygsvx3wi0dvhle2rheehgw/rasf8ryjil5kvvwira/l+subezl58hw8odxh/d6afjzjpz58fqgrv2h93qb8y/gz/byqhimjhsct9fjqozqyscdxr2w/mbxv2qzfgpxpumt+brzcscn6pcf5fedwe/jrieetgwxd4mum5rt8fkbpjtfx2ejx6rmcb78jc6gqmmpg8oogtufyjuy6rn8zhk839qzb7wmfkzt4ubdb4qvlutke364e5fxgw8/goz/bzgwnv3og56iqpoy0wmsfwa8vvay1jm2d/ulp4beofb+wfmm43gxoetxcmpvvcpejkhwedbdyyp3cchzhvr1cubefmulvh0tm58hxs200m0kln2tp5cf47tphhysnpv/q4gk5kbqvwl8wjohdz5wjja7bqpixwpymhluezeb/9aksd4b+i4y7l5wtjrtao8vwu48stwo38vwb+qp+n7dwjopew/ilut/gpe0hjdzpdk/utg7e4/k9p0nt4ott6okvofwyehrc4/09gqrpv08e6f4cfjomv/2nywd+bqwx+tgzfnuxkz+o6exgdul89q/tbwj2z8v4yepr80svj5j3unplj4nxe2y/elt7xiqps/przm8r+4fq5sgdwf0o+j2yhxi4t7qj9vrcz285gfpt7xr74epr89tl2w+e0uulkun3co3ghz19uoyf3wldll/muwt5lqogvpucxx4o+r1b8ps8qx6lag+1esfurin67z/uun+igxkn5ffqg98hvw9+bp12fx7zdb+dre/lbe7o9mench5j6q9tp7rbs9t7z51d39rrb7jt+qpss1va6z/w01vllzh7s6v1o9z+ihydq8/p3n+bov5lzv7u3on9wmc7g1skzn9+b99+4i6er6z2d3f1fozx0g9glznnm+sd3b+gbbnypr3cxuigc2bs7hes2hfa90oon99c3u/j/i4hfsvzd7gvfpb3pkzfeh8zkmh1iyhsun/g1t6w39xjr8ha2k3kawdxwpn9i8/zuhxld4c0hn/v+moge4yrmyyqk703eh6r6xmcaiewzf7z0up1mso/k4gbuj4+ae+xw7m5ymri7xjcb3x6bggwhm/+aawho8og8hbm+d13fjj0ak5y00iampe7rzxewgdg9ocfesdsavgczvg9c300oh7o3gqxwgui8k02x2ycwuxs9q/8juqmvh9mejq7f5oapyps6sctpqp6fjcz53rxt8c/qmt/4mxhoabcfpfn4effotkti4fgklif1lrj5hrj096xqm122gdptlfv7qlmel5uftxzk8nrsmxdeyp5bbm+d/wz8ehq39xkkkfvoszpz/nps/x/ndwti1eg0iycmlv9vbxrzgmabuamnah05tbnuohbra4w7mowrzbfu5bamwzj55me7nswobljeqg+hdyt8vwl60xszjvti0rnjqhv2n3s09gj+bqsnoi05phryoh5pie3ngg82umadb1f7wc3dzq+wbwb9f/5alowb8hid9oewmwn85t/bswmgyi3bdsibegwrxvojetnxmzcwhyggs9g+k6t1fdytnkbmzs2uy5byklzz392mrljkh68htlaal7pd3yxuvgr/iw6ge2hh05oj5wtiypaahljiqjvu4kpnk/vsmryrppj+sl5zvsrgp5vcbcp6qic6pxsjj68rdkityf81igyhy/pjff0p2kkvzdwcdwyxzbxr6rcep0yzejthyw+iym6nxfcmqnw9jek5aqih8f1ewveap3ht9laqnx5vymfeotxixb5jeqghmv3my+al3d7d3jb4nq3bgokszduaxox7i9u+897+789ybx1n/n5m8bk0iuh2jgct9v18ug//rno8csg83qxx8tq01bxqzviosn0uuvb0u2/yhluz1vcgyfuak23u6dv8dydvxl1+696+2+ioz3+677tp5eqnbxv0ewm9gn98byoe6fm7x+bcwvibviboyc6fhv1ohr3fsshtxf1ikk+ctbnjcbcatq52bdssx11vr2mqupzrn+v1wr9fn82vq/op2rruav7s97+dnspbrxih9fhxkj4suqgpufpyfwulrysbglmollt5j7mecsbfn7mqgancx6riez4odghnztx8perdcsuj2/cdbza3yyjhmbmjr19xasc8tkgb0n/j1+oigy+bdinkffuf/bjuztbt6aal0hvzga4rfzghllwiotnoqbb9pkxj5wguerdcchi3ljiekmqwzvnjhvvmwzefpkxjzegusgcoer8fscocdqbgetk4cjmkbpuzravmsekxmus4w9/so7ksenfbhy1fltgm7n/ivzxt4hxhestvs+x6jneq5phze1rknrgejdozxyur+kzgf0g6krxz+mmpgveca6ltebxgisshtw9zhecbqee0wunkxr7hfwjvde3ypujuusxopnoo/o0/dgdlyg7aazi56vnyzyh1hla99mhi4/duoiror5o6qi/pdxx69mart3otfkkhjqd76qpq0vkssovq7s/jwdxq2uysusufuftg0udq6k4qrgymzfigoe4ngixfuepm7zxi6qhulplbmcxhpafijlk37p2wlorsiqvjv2dm/ikfsbb96uq0yvtmbmpm4jzhhsomhec7musrfyzjxt0mep6ctcox5qsqo1+gobobi6vzmkzltsma+prfot2lwvmqbwnvycbepfi2b9xb7x5g0vy9lsubbndwaa6zvmpgygwrm3g1dfgkqnforrc+jm3rtzvepkriayhnzc1i5sdsmlk/whcjdwqyatpyaaaaabjru5erkjggg=='} alt=""/> 118 \</div> 119 \<div classname="login social item"> 120 \<img classname="login social item image" src={'data\ 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alt=""/> 121 \</div> 122 \</div> 123 \<p classname="form hint">don't have an account? \<a classname="form link" href="#">sign up\</a>\</p> 124 \</div> 125 )} 126 {currentuser !== null && ( 127 \<div classname="container"> 128 \<h2 classname="heading">{'user screen'}\</h2> 129 \<divider /> 130 \<h2 classname="heading">{`hello ${currentuser get('username')}!`}\</h2> 131 \<div classname="form buttons"> 132 \<button 133 onclick={() => douserlogout()} 134 type="primary" 135 classname="form button" 136 color={'#208aec'} 137 size="large" 138 > 139 log out 140 \</button> 141 \</div> 142 \</div> 143 )} 144 \</div> 145 ); 146 }; userlogin tsx 1 import react, { usestate, fc, reactelement } from 'react'; 2 import ' /app css'; 3 import { button, divider, input } from 'antd'; 4 const parse = require('parse/dist/parse min js'); 5&#x9; 6 export const userlogin fc<{}> = () reactelement => { 7 // state variables 8 const \[username, setusername] = usestate(''); 9 const \[password, setpassword] = usestate(''); 10 const \[currentuser, setcurrentuser] = usestate\<parse object | null>(null); 11&#x9; 12 const douserlogin = async function () promise\<boolean> { 13 // note that these values come from state variables that we've declared before 14 const usernamevalue string = username; 15 const passwordvalue string = password; 16 try { 17 const loggedinuser parse user = await parse user login(usernamevalue, passwordvalue); 18 // login returns the corresponding parseuser object 19 alert( 20 `success! user ${loggedinuser get('username')} has successfully signed in!`, 21 ); 22 // to verify that this is in fact the current user, `current` can be used 23 const currentuser parse user = await parse user current(); 24 console log(loggedinuser === currentuser); 25 // clear input fields 26 setusername(''); 27 setpassword(''); 28 // update state variable holding current user 29 getcurrentuser(); 30 return true; 31 } catch (error any) { 32 // error can be caused by wrong parameters or lack of internet connection 33 alert(`error! ${error message}`); 34 return false; 35 } 36 }; 37&#x9; 38 const douserlogout = async function () promise\<boolean> { 39 try { 40 await parse user logout(); 41 // to verify that current user is now empty, currentasync can be used 42 const currentuser parse user = await parse user current(); 43 if (currentuser === null) { 44 alert('success! no user is logged in anymore!'); 45 } 46 // update state variable holding current user 47 getcurrentuser(); 48 return true; 49 } catch (error any) { 50 alert(`error! ${error message}`); 51 return false; 52 } 53 }; 54&#x9; 55 // function that will return current user and also update current username 56 const getcurrentuser = async function () promise\<parse user | null> { 57 const currentuser (parse user | null) = await parse user current(); 58 // update state variable holding current user 59 setcurrentuser(currentuser); 60 return currentuser; 61 } 62&#x9; 63 return ( 64 \<div> 65 \<div classname="header"> 66 \<img 67 classname="header logo" 68 alt="back4app logo" 69 src={ 70 'https //blog back4app com/wp content/uploads/2019/05/back4app white logo 500px png' 71 } 72 /> 73 \<p classname="header text bold">{'react on back4app'}\</p> 74 \<p classname="header text">{'user login'}\</p> 75 \</div> 76 {currentuser === null && ( 77 \<div classname="container"> 78 \<h2 classname="heading">{'user login'}\</h2> 79 \<divider /> 80 \<div classname="form wrapper"> 81 \<input 82 value={username} 83 onchange={(event) => setusername(event target value)} 84 placeholder="username" 85 size="large" 86 classname="form input" 87 /> 88 \<input 89 value={password} 90 onchange={(event) => setpassword(event target value)} 91 placeholder="password" 92 size="large" 93 type="password" 94 classname="form input" 95 /> 96 \</div> 97 \<div classname="form buttons"> 98 \<button 99 onclick={() => douserlogin()} 100 type="primary" 101 classname="form button" 102 color={'#208aec'} 103 size="large" 104 block 105 > 106 log in 107 \</button> 108 \</div> 109 \<divider /> 110 \<div classname="login social"> 111 \<div classname="login social item login social item facebook"> 112 \<img classname="login social item image" src={'https //findicons com/files/icons/2830/clean social icons/250/facebook png'} alt=""/> 113 \</div> 114 \<div classname="login social item"> 115 \<img classname="login social item image" src={'data\ 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alt=""/> 116 \</div> 117 \<div classname="login social item"> 118 \<img classname="login social item image" src={'data\ 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alt=""/> 119 \</div> 120 \</div> 121 \<p classname="form hint">don't have an account? \<a classname="form link" href="#">sign up\</a>\</p> 122 \</div> 123 )} 124 {currentuser !== null && 125 (\<div classname="container"> 126 \<h2 classname="heading">{'user screen'}\</h2> 127 \<divider /> 128 \<h2 classname="heading">{`hello ${currentuser get('username')}!`}\</h2> 129 \<div classname="form buttons"> 130 \<button 131 onclick={() => douserlogout()} 132 type="primary" 133 classname="form button" 134 color={'#208aec'} 135 size="large" 136 > 137 log out 138 \</button> 139 \</div> 140 \</div>) 141 } 142 \</div> 143 ); 144 }; 結論 このガイドの最後に、reactでparseユーザーのログインとログアウトを行う方法を学びました。次のガイドでは、便利なユーザークエリを実行する方法を示します。