Implémentation de Connexion/Déconnexion avec Parse et React

connexion et déconnexion des utilisateurs pour react introduction après avoir implémenté un composant qui gère l'enregistrement des utilisateurs dans parse dans le dernier guide, vous allez maintenant apprendre à connecter et déconnecter les utilisateurs en utilisant la même parse user parse user classe la parse user login parse user login méthode stocke dans votre stockage local une session utilisateur valide, donc les appels futurs à des méthodes comme current current récupéreront avec succès vos données utilisateur d'autre part, logout logout effacera cette session du disque et déconnectera de tous les services liés sur votre serveur parse prérequis pour compléter ce tutoriel, vous aurez besoin de une application react créée et connectée à back4app complétez le guide précédent afin d'avoir une meilleure compréhension de la classe parse user si vous souhaitez tester/utiliser la mise en page de l'écran fournie par ce guide, vous devez configurer la ant design ant design bibliothèque objectif construire une fonctionnalité de connexion et déconnexion des utilisateurs en utilisant parse pour une application react 1 comprendre les méthodes login et logout la gestion des utilisateurs de parse utilise le parse user parse user type d'objet, qui étend le type par défaut parseobject parseobject tout en contenant des méthodes d'aide uniques, telles que current current et getusername getusername , qui vous aideront à récupérer les données utilisateur dans votre application vous pouvez en savoir plus sur l' objet parse user objet parse user ici dans la documentation officielle https //parseplatform org/parse sdk js/api/master/parse user html dans ce guide, vous apprendrez à utiliser les méthodes login login et logout logout qui géreront le processus de connexion de l'utilisateur, en sauvegardant les données de l'utilisateur localement 2 création d'un composant de connexion construisons maintenant le userlogin userlogin composant dans votre application créez un nouveau fichier dans votre src src répertoire appelé userlogin js userlogin js ( userlogin tsx userlogin tsx si vous utilisez typescript) et ajoutez les éléments d'entrée en utilisant des hooks d'état pour gérer leurs données notez qu'il y a aussi une fonction responsable de la mise à jour d'une variable d'état avec l'utilisateur actuellement connecté, que vous utiliserez plus tard 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\ 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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\ 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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 }; vous pouvez maintenant implémenter la fonction qui appellera le parse user login parse user login méthode, en utilisant des variables d'état 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 }; insérez cette fonction à l'intérieur du userlogin userlogin composant, juste avant le return return appel, pour être appelée et testée n'oubliez pas de mettre à jour l'action du bouton de connexion du formulaire onclick onclick à () => douserlogin() () => douserlogin() si vous souhaitez rendre complètement cette mise en page d'écran, ajoutez ces classes à votre app css app css fichier 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 } allez y et exécutez votre application, en important ce composant de connexion dans votre fichier d'application principal vous devriez voir un écran comme celui ci et également un message de succès après vous être connecté avec les bonnes informations d'identification 3 vérification de l'utilisateur connecté après que votre utilisateur se soit connecté avec succès à l'application, il devrait être en mesure de le savoir et également de se déconnecter de l'application tout d'abord, cachons le formulaire de connexion et affichons un message de bienvenue contenant le nom d'utilisateur notez l'utilisation de l'opérateur conditionnel en conjonction avec la variable d'état contenant le nom d'utilisateur actuel 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,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=""/> 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\ 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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 }; allez y et exécutez à nouveau votre application remarquez que votre application affichera maintenant l'écran utilisateur et le message de bienvenue comme ceci 4 création d'une fonction de déconnexion le déconnexion déconnexion méthode est plus simple que la connexion puisque le parse user logout parse user logout méthode ne prend aucun argument et efface automatiquement les données de l'utilisateur actuel données de l'utilisateur actuel stockées localement créez cette fonction dans le userlogin userlogin composant et appelez la dans l' onclick onclick attribut du bouton de déconnexion 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 }; si vous effectuez une déconnexion réussie, vous verrez un message comme celui ci voici le code complet du composant contenant toutes les fonctions montrées précédemment 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,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'} 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 }; conclusion à la fin de ce guide, vous avez appris comment connecter et déconnecter les utilisateurs parse sur react dans le prochain guide, nous vous montrerons comment effectuer des requêtes utilisateur utiles