{"id":3188,"date":"2023-05-08T09:07:15","date_gmt":"2023-05-08T09:07:15","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/easy-guide-to-react-lifecycle\/"},"modified":"2026-03-05T10:49:33","modified_gmt":"2026-03-05T10:49:33","slug":"vienkarss-celvedis-par-react-dzives-ciklu","status":"publish","type":"post","link":"https:\/\/thecodest.co\/lv\/blog\/easy-guide-to-react-lifecycle\/","title":{"rendered":"Vienk\u0101r\u0161a React dz\u012bves cikla rokasgr\u0101mata"},"content":{"rendered":"

Laipni l\u016bdzam! Ja esat \u0161eit, j\u016bs, visticam\u0101k, esat topo\u0161ais front-end lietot\u0101js. izstr\u0101d\u0101t\u0101js<\/a> v\u0113las padzi\u013cin\u0101ti izprast React<\/a> vai varb\u016bt pat pieredz\u0113jis profesion\u0101lis, kas apg\u016bst pamatus. \u0160is raksts kalpo k\u0101 ce\u013cvedis par visu React dz\u012bves cikls<\/strong> - tas ir luktur\u012btis \u0161im \u0161\u0137ietami tum\u0161ajam me\u017eam, t\u0101p\u0113c cie\u0161i turieties un gatavojieties doties \u0161aj\u0101 intri\u0123\u0113jo\u0161\u0101 ce\u013cojum\u0101.<\/p>\n

React dz\u012bves cikla p\u0101rskats<\/h2>\n

Sast\u0101vda\u013cas dz\u012bves cikla koncepcija programmat\u016bras izstr\u0101de<\/a> ir l\u012bdz\u012bgs dz\u012bvu organismu aug\u0161anas un lejupsl\u012bdes posmiem. L\u012bdz\u012bgi ar\u012b j\u016bsu React komponenti iziet vair\u0101kas at\u0161\u0137ir\u012bgas f\u0101zes - tie piedzimst (mont\u0113ti), aug (atjaunin\u0101ti) un beig\u0101s iet boj\u0101 (atmont\u0113ti). Izpratne par \u0161iem posmiem pal\u012bdz pan\u0101kt lab\u0101ku veiktsp\u0113jas optimiz\u0101ciju un palielina j\u016bsu sp\u0113ju efekt\u012bvi nov\u0113rst k\u013c\u016bdas.<\/p>\n

\u0160eit ir \u010detri b\u016btiski so\u013ci, kas saist\u012bti ar komponenta dz\u012bves cikls<\/strong>:<\/p>\n

    \n
  1. Inicializ\u0113\u0161ana: \u0160aj\u0101 sol\u012b tiek iestat\u012bts st\u0101voklis un rekviz\u012bti.<\/li>\n
  2. Mont\u0101\u017ea: Posms, kur\u0101 m\u016bsu React komponents<\/strong> piestiprina sevi pie DOM.<\/li>\n
  3. Atjaunin\u0101\u0161ana: \u0160aj\u0101 f\u0101z\u0113 ietilpst visas turpm\u0101k\u0101s izmai\u0146as, kas radu\u0161\u0101s no valst\u012bm vai rekviz\u012btiem sa\u0146emto atjaunin\u0101jumu d\u0113\u013c.<\/li>\n
  4. Atvieno\u0161ana: . nobeiguma posms<\/strong> kur komponents ir no\u0146emts no DOM<\/strong>.
    \n\u0160os posmus var vizualiz\u0113t, izmantojot dz\u012bves cikla diagrammu, piem\u0113ram, \u0161o.<\/li>\n<\/ol>\n

    Turpm\u0101kaj\u0101s sada\u013c\u0101s m\u0113s apl\u016bkosim katru posmu atsevi\u0161\u0137i ar re\u0101liem piem\u0113riem, lai uzlabotu izpratni - esiet gatavi padzi\u013cin\u0101tai izpratnei par metodes<\/strong> piem\u0113ram, componentDidMount, getDerivedStateFromProps, render, componentDidUpdate utt. Dekonstru\u0113jot \u0161os j\u0113dzienus pa gabali\u0146am, j\u016bs ieg\u016bsiet zin\u0101\u0161anas, kas patiesi p\u0101rtaps praktiski izmantojam\u0101s atzi\u0146\u0101s turpm\u0101kajos projektos, kas saist\u012bti ar reactjs dz\u012bves ciklu!<\/p>\n

    Mont\u0101\u017eas f\u0101ze<\/h2>\n

    Port\u0101ls mont\u0101\u017eas posms<\/strong> in the React dz\u012bves cikls<\/strong> atspogu\u013co st\u0101vokli, kad m\u016bsu komponenti tiek izveidoti un pirmo reizi ievietoti DOM. \u0160is posms ietver \u010detrus b\u016btiskus elementus metodes<\/strong>: konstruktors, getDerivedStateFromProps, render un componentDidMount.<\/p>\n

    Konstruktors<\/h2>\n

    Port\u0101ls konstruktora metode<\/strong> ir s\u0101kotn\u0113jais solis, lai iestat\u012btu uz klas\u0113m balst\u012btus komponentus. Dom\u0101jiet par to k\u0101 par savas komponentes \"ieejas bi\u013ceti\" uz React dz\u012bves cikls<\/strong>. Konstruktora funkcija parasti galvenok\u0101rt veic divas darb\u012bbas:
    \n1. Viet\u0113j\u0101 st\u0101vok\u013ca inicializ\u0113\u0161ana.
    \n2. Notikumu apstr\u0101d\u0101t\u0101ju meto\u017eu sasaist\u012b\u0161ana.
    \nB\u016bt\u012bb\u0101 \u0161eit tiek iestat\u012bts noklus\u0113juma st\u0101voklis un defin\u0113tas visas nepiecie\u0161am\u0101s komponenta instances \u012bpa\u0161\u012bbas.<\/p>\n

    GetDerivedStateFromProps<\/h2>\n

    N\u0101kamais m\u016bsu ce\u013cojum\u0101 pa mont\u0101\u017eas posms<\/strong> ir getDerivedStateFromProps. \u0160is statisk\u0101 metode <\/strong>bru\u0123\u0113ja ce\u013cu uz skatuves ar React 16.3. Tas \u013cauj mums<\/a> lai sinhroniz\u0113tu komponenta iek\u0161\u0113jo st\u0101vokli ar izmai\u0146\u0101m, kas atspogu\u013cotas, izmantojot vec\u0101ka komponenta sniegtos rekviz\u012btus, pirms notiek render\u0113\u0161ana. Izmantojiet to taup\u012bgi! P\u0101rm\u0113r\u012bga lieto\u0161ana var rad\u012bt sare\u017e\u0123\u012bjumus sinhroniz\u0101cijas procesa blakuspar\u0101d\u012bbu d\u0113\u013c.<\/p>\n

    \"\"<\/a><\/p>\n

    Render<\/h2>\n

    P\u0113c tam, kad ir iestat\u012bts viss nepiecie\u0161amais, m\u0113s turpin\u0101m render\u0113\u0161anu. \u0160\u012b t\u012br\u0101 metode nodro\u0161ina JSX vai nulli, ja nekas nav j\u0101att\u0113lo - b\u016bt\u012bb\u0101 t\u0101 ir vieta, kur tiek ieskic\u0113ta visa j\u016bsu iez\u012bm\u0113\u0161ana!<\/p>\n

    Kritiskais aspekts? Neizraisiet blakuspar\u0101d\u012bbas, jo render\u0113\u0161ana var tikt palaista vair\u0101kas reizes, izraisot nev\u0113lamu efektu un veiktsp\u0113jas probl\u0113mas!<\/p>\n

    ComponentDidMount<\/h2>\n

    Un voil\u00e0! Kad m\u016bsu 'markup' no render ir veiksm\u012bgi pievienots DOM, n\u0101k componentDidMount. Tagad \u0161is funkcion\u0101lais komponents<\/strong> puisis p\u0101rliecin\u0101s, ka visi nepiecie\u0161amie dati<\/a> p\u0113c render\u0113\u0161anas var iel\u0101d\u0113t efekt\u012bvi, p\u0101r\u0101k neietekm\u0113jot veiktsp\u0113ju - parasti t\u0101 ir ide\u0101la vieta asinhroniem fetch piepras\u012bjumiem, st\u0101vok\u013ca atjaunin\u0101\u0161anai, izmantojot API<\/a> atbildes vai iestat\u012bt taimerus.<\/p>\n

    Tom\u0113r atcerieties: asinhrono procesu kontrol\u0113\u0161ana pal\u012bdz\u0113s nodro\u0161in\u0101t vienm\u0113r\u012bgu lietot\u0101ja pieredzi!<\/p>\n

    Ar to nosl\u0113dzas m\u016bsu ekskursija par React mont\u0101\u017eas posms<\/strong>-b\u016btisks periods React komponentu dz\u012bves cikls<\/strong> kas bru\u0123\u0113 \u0161\u0101du neat\u0146emamu pamatu efekt\u012bvai t\u012bmek\u013ca lietojumprogrammas<\/a> izveide un p\u0101rvald\u012bba. \u0160aj\u0101 aizraujo\u0161aj\u0101 ce\u013cojum\u0101, kas piepild\u012bts ar konstruktoriem, atvasin\u0101tiem st\u0101vok\u013ciem no rekviz\u012btiem, masveida render\u0113\u0161anu un, visbeidzot, didMount uzdevumu izpildi p\u0113c render\u0113\u0161anas, j\u016bs gaida dzi\u013c\u0101kas koncepcijas, piem\u0113ram. atjaunin\u0101\u0161anas posmi<\/strong> & demont\u0101\u017ea - viss tas v\u0113l vair\u0101k nostiprina ReactJS dz\u012bves cikla zin\u0101\u0161anas!<\/p>\n

    Atjaunin\u0101\u0161anas f\u0101ze<\/h2>\n

    Pamatposms React dz\u012bves cikls <\/strong>ir f\u0101ze \"Atjaunin\u0101\u0161ana\". \u0160aj\u0101 posm\u0101 jebkur\u0161 st\u0101voklis, kas ir main\u012bjies, izraisa atk\u0101rtotu att\u0113lo\u0161anas procesu un var novest pie komponentu atjaunin\u0101\u0161anas. \u0160eit apl\u016bkosim piecus galvenos metodes<\/strong> kas veido \u0161o atjaunin\u0101\u0161anas f\u0101ze<\/strong>: - getDerivedStateFromProps, shouldComponentUpdate, render, getSnapshotBeforeUpdate un componentDidUpdate. \u0160o komponentu apguve dz\u012bves cikla metodes<\/strong> react izstr\u0101d\u0101t\u0101ji bie\u017ei vien cen\u0161as, t\u0101d\u0113j\u0101di nodro\u0161inot m\u016bsu reakt\u012bv\u0101s sist\u0113mas netrauc\u0113tu ievie\u0161anu. komponentu atjaunin\u0101jumi<\/strong>.<\/p>\n

    getDerivedStateFromProps<\/h2>\n

    Lai cik mulsino\u0161s \u0161\u0137iet t\u0101s nosaukums, \u0161\u012b metode re\u0123istr\u0113 atjaunin\u0101t\u0101s \u012bpa\u0161\u012bbas, kas atvasin\u0101tas no j\u016bsu komponenta vec\u0101kiem. GetDerivedStateFromProps piem\u0113rs demonstr\u0113, k\u0101 tas nodro\u0161ina notikumus, kas notiek \u0101rpus komponenta, izraisot iesp\u0113jamas izmai\u0146as komponenta sast\u0101v\u0101. komponenta st\u0101voklis<\/strong> pamatojoties uz jaun\u0101m \u012bpa\u0161\u012bb\u0101m, kas sa\u0146emtas no vec\u0101ka. Tom\u0113r esiet uzman\u012bgi; izmantojot \u0161o metodi, ir j\u0101iev\u0113ro piesardz\u012bba, jo p\u0101rm\u0113r\u012bga izmanto\u0161ana var rad\u012bt gr\u016bti atk\u013c\u016bdo\u0161anai un uztur\u0113\u0161anas probl\u0113mas.
    \nshouldComponentUpdate<\/p>\n

    N\u0101kamais ir 'shouldComponentUpdate'. \u0160is iev\u0113rojamais atska\u0146ot\u0101js nodro\u0161ina mums kontroli, \u013caujot mums izlemt, vai izmai\u0146as st\u0101vokl\u012b vai rekviz\u012btos attaisno m\u016bsu komponenta atk\u0101rtotu render\u0113\u0161anu. Parasti tas atgrie\u017e true p\u0113c noklus\u0113juma v\u0113rt\u012bbas, kas noz\u012bm\u0113, ka p\u0113c katr\u0101m izmai\u0146\u0101m komponents tiek p\u0101rstart\u0113ts. Tom\u0113r, ja ir nepiecie\u0161ama veiktsp\u0113jas optimiz\u0101cija vai v\u0113laties ietaup\u012bt da\u017eus atveidojumus, tas \u013cauj jums atgriezt false<\/strong>.<\/p>\n

    atveidot<\/h2>\n

    Saprotams, ka \".render\" ir visu dz\u012bves cikla posmu pamat\u0101. metodes<\/strong> gan p\u0101rnest\u0101, gan tie\u0161\u0101 noz\u012bm\u0113. Taj\u0101 att\u0113lots tas, kas par\u0101d\u0101s uz ekr\u0101na p\u0113c p\u0101rkonversijas. p\u0101rveidot render\u0113\u0161anu<\/strong> notiek, kad notiek st\u0101vok\u013ca mai\u0146a. Nobeigum\u0101 sakot, vienm\u0113r, kad ir nepiecie\u0161ams atjaunin\u0101t komponenta vizu\u0101lo inform\u0101ciju, jo main\u0101s m\u016bsu st\u0101voklis vai tie\u0161\u0101s \u012bpa\u0161\u012bbas, tiek izmantots render\u0113\u0161ana.<\/p>\n

    getSnapshotBeforeUpdate<\/h2>\n

    Ret\u0101k izmantot\u0101, bet noder\u012bg\u0101 metode ir paz\u012bstama k\u0101 \"getSnapshotBeforeUpdate\". T\u0101s funkcija ir ieg\u016bt noteiktu inform\u0101ciju par DOM, pirms tas tiek potenci\u0101li modific\u0113ts atveido\u0161anas laik\u0101 - tas ir noder\u012bgi, ja tiek saglab\u0101ti t\u0101di aspekti k\u0101 ritin\u0101\u0161anas poz\u012bcija<\/strong> vai lietot\u0101ja satura ievadi, pirms tiek veikti apjom\u012bgi atjaunin\u0101jumi.<\/p>\n

    componentDidUpdate<\/h2>\n

    P\u0113d\u0113jais, bet ne maz\u0101k svar\u012bgais, ir \"componentDidUpdate\", kas ir tr\u0101p\u012bgs nosaukums, jo tas tiek izpild\u012bts uzreiz p\u0113c tam, kad p\u0113c atveido\u0161anas darb\u012bbas notiek atjaunin\u0101jums, un kalpo k\u0101 lielisks laika interv\u0101ls, lai. t\u012bkla piepras\u012bjumi<\/strong> iz\u0146emot situ\u0101cijas, kas izriet no pa\u0161a render\u0113\u0161anas vai gad\u012bjuma atp\u016btas, kas apz\u012bm\u0113ta konstruktor\u0101. Nodro\u0161in\u0101t izvair\u012b\u0161anos no bezgal\u012bg\u0101m cilp\u0101m, iepriek\u0161 iestatot st\u0101vok\u013cus, kas pasarg\u0101 no iesp\u0113jam\u0101m k\u013c\u016bd\u0101m.
    \nIzgaismojot \u0161os metodes<\/strong> deta\u013cas m\u0113s esam \u0161\u0137\u0113rsoju\u0161i laik\u0101 reactjs dz\u012bves cikla laik\u0101 \"atjaunin\u0101\u0161ana\" f\u0101ze pal\u012bdz\u0113tu \u012bstenot uzlabojumus bez piep\u016bles, vienlaikus iek\u013caujot sare\u017e\u0123\u012btas oper\u0101cijas, uzlabojot prasmi, t\u0101d\u0113j\u0101di eksponenci\u0101li padarot kod\u0113\u0161anas \u0113rts!<\/p>\n

    Atvieno\u0161anas f\u0101ze<\/h2>\n

    Turpinot p\u0113t\u012bt skait\u012bt\u0101ja komponents<\/strong> da\u013ca no React dz\u012bves cikls<\/strong>, ir pien\u0101cis laiks uzs\u0101kt tikpat svar\u012bgu posmu -. Atvieno\u0161anas f\u0101ze<\/strong>. \u0160eit notiek komponentu no\u0146em\u0161ana no dokumenta objektu mode\u013ca (DOM), kas ir bie\u017ei nepaman\u012bta, ta\u010du neaizst\u0101jama darb\u012bba.<\/p>\n

    componentWillUnmount<\/h2>\n

    Lai pien\u0101c\u012bgi atvad\u012btos, React pied\u0101v\u0101 mums p\u0113d\u0113jo metodi: componentWillUnmount. \u0160\u012bs metodes izmanto\u0161ana dz\u012bves cikla metode<\/strong> ir \u013coti svar\u012bga gan optimiz\u0101cijai, gan k\u013c\u016bdu nov\u0113r\u0161anai.<\/p>\n

    Vienk\u0101r\u0161\u0101kaj\u0101 form\u0101 komponentsWillUnmount izpilda render\u0113\u0161anas metode<\/strong> tie\u0161i pirms komponents tiek atvienots un p\u0113c tam izn\u012bcin\u0101ts. Apsveriet \u0161\u012bs metodes v\u0113rt\u012bgo lietder\u012bbu; t\u0101 ir j\u016bsu p\u0113d\u0113j\u0101 iesp\u0113ja savilkt galus pirms atvad\u012b\u0161an\u0101s no komponenta.<\/p>\n

    Iesp\u0113jams, turpin\u0101sies t\u012bkla piepras\u012bjumi<\/strong>, akt\u012bvie taimeri vai abonementi, kurus esat inici\u0113jis komponenta dz\u012bves cikla laik\u0101. Tagad, kad m\u0113s non\u0101kam uz \u0161o komponentu nos\u016bt\u012b\u0161anas uz neesam\u012bbu robe\u017eas, j\u016bsu pien\u0101kums ir atcelt \u0161\u012bs notieko\u0161\u0101s darb\u012bbas. Ja tas netiek izdar\u012bts, rodas atmi\u0146as nopl\u016bde, kas var izrais\u012bt nepareizu j\u016bsu lietojumprogrammas darb\u012bbu vai piln\u012bgu neveiksmi.<\/p>\n

    Tagad, kad esat iepazinu\u0161ies ar parastajiem componentWillUnmount lietojumiem, ir v\u0113rts ar\u012b nor\u0101d\u012bt, ko nedr\u012bkst dar\u012bt \u0161\u012bs metodes ietvaros. Galvenok\u0101rt j\u0101atceras, ka \u0161eit nevar iestat\u012bt st\u0101vokli, jo, tikl\u012bdz komponenta gad\u012bjums non\u0101k demont\u0101\u017eas f\u0101ze<\/strong>, j\u016bs nevarat to atgriezt.<\/p>\n

    T\u0101d\u0113j\u0101di nosl\u0113dzas m\u016bsu p\u0113t\u012bjums par komponentuWillUnmount un l\u012bdz ar to ar\u012b par \"atvieno\u0161anas\" f\u0101zi react un komponenta dz\u012bves cikls<\/strong>. \u0160ie j\u0113dzieni ir vair\u0101ki elementi, kas pal\u012bdz efekt\u012bvi p\u0101rvald\u012bt komponentu dz\u012bves ilgumu: ne tikai zin\u0101t, k\u0101p\u0113c \u0161ie so\u013ci ir j\u0101izpilda, bet ar\u012b saprast, k\u0101 tie iek\u013caujas pla\u0161\u0101k\u0101 kontekst\u0101, piem\u0113ram, veiktsp\u0113jas optimiz\u0101cij\u0101 un k\u013c\u016bdu nov\u0113r\u0161an\u0101.<\/p>\n

    Funkcijas p\u0101rv\u0113r\u0161ana klas\u0113<\/h2>\n

    ReactJS \u013cauj jums, rakstot komponentus, izmantot vai nu funkcijas, vai klases. Tom\u0113r var b\u016bt gad\u012bjumi, kad jums b\u016btu lietder\u012bg\u0101k p\u0101rveidot funkciju par klases komponentu. S\u0101kum\u0101 \u0161is process var \u0161\u0137ist bied\u0113jo\u0161s, jo \u012bpa\u0161i, ja v\u0113l tikai apg\u016bstat komponentu. React dz\u012bves cikls<\/strong>.
    \nTagad iedzi\u013cin\u0101simies un sadal\u012bsim \u0161\u012bs p\u0101rejas posmus.<\/p>\n

      \n
    1. Izveidojiet ES6 klasi: Pirmais solis ir izveidot ES6 klasi, kas papla\u0161ina React.Component. Interesanti, ka gan funkciju, gan kla\u0161u komponenti ReactJS var atveidot UI aprakstus, kas ir sinon\u012bmi funkciju defin\u0113\u0161anai.<\/li>\n
    2. Integr\u0113jiet biju\u0161o funkcijas \u0137ermeni: P\u0113c tam ievietojiet savu atveido\u0161anas lo\u0123iku (iepriek\u0161 visu funkcijas \u0137ermeni) jaun\u0101 metod\u0113 ar nosaukumu render(), kas ievietota j\u016bsu tikko izveidotaj\u0101 klas\u0113:<\/li>\n
    3. Rekviz\u012bti punkti: Atceraties rekviz\u012btus, uz kuriem atsaucaties tie\u0161i k\u0101 uz argumentiem sav\u0101 s\u0101kotn\u0113j\u0101 funkcij\u0101? Tagad tiem vajadz\u0113tu piek\u013c\u016bt, izmantojot this.props vis\u0101s nestatiskaj\u0101s funkcij\u0101s. metodes<\/strong> j\u016bsu jaun\u0101s klases.<\/li>\n<\/ol>\n

      J\u0101atz\u012bm\u0113, ka \u0161o so\u013cu m\u0113r\u0137is ir tikai pal\u012bdz\u0113t s\u0101kt konvert\u0113\u0161anas procesu. funkcion\u0101l\u0101s sast\u0101vda\u013cas<\/strong> saist\u012bb\u0101 ar React dz\u012bves cikls<\/strong> l\u012bdzv\u0113rt\u012bg\u0101s klas\u0113s. Turpiniet praktiz\u0113ties, l\u012bdz iem\u0101c\u012bsieties izmantot abas pieejas savstarp\u0113ji aizvietojami, pamatojoties uz projekts<\/a> pras\u012bbas un person\u012bg\u0101s v\u0113lmes!<\/p>\n

      Turpiniet m\u0101c\u012bties un p\u0113t\u012bt, jo dz\u012bves cikla apg\u016b\u0161ana reactjs prasa laiku un praktisko pieredzi! Laim\u012bgu kod\u0113\u0161anas!<\/p>\n

      Viet\u0113j\u0101 st\u0101vok\u013ca pievieno\u0161ana klasei<\/h2>\n

      \u0160aj\u0101 jom\u0101 React izstr\u0101de<\/a>, viet\u0113jais st\u0101voklis ir viens no neat\u0146emamiem aspektiem. \u0160is elements, kas tiek saprasts k\u0101 \"st\u0101voklis\", ietekm\u0113 komponentu atveidi un uzved\u012bbu. Da\u017eas j\u016bsu lietojumprogrammas sast\u0101vda\u013cas b\u016bs atkar\u012bgas no st\u0101vok\u013ca, un t\u0101m b\u016bs j\u0101uztur, j\u0101maina vai j\u0101seko l\u012bdzi specifiska veida inform\u0101cijai, kas pieder tikai t\u0101m, t\u0101tad to \"viet\u0113jais st\u0101voklis\".<\/p>\n

      Viet\u0113j\u0101s valsts loma<\/h2>\n

      Komponenta viet\u0113j\u0101 valsts galu gal\u0101 kontrol\u0113 tikai un vien\u012bgi t\u0101 iek\u0161\u0113j\u0101s darb\u012bbas. Piem\u0113ram, lai noteiktu, vai lietot\u0101js ir noklik\u0161\u0137in\u0101jis uz izlai\u017eam\u0101s izv\u0113lnes j\u016bsu lietotn\u0113, var izmantot viet\u0113jo st\u0101vokli - \u0161\u012bs zin\u0101\u0161anas nav j\u0101dala vai j\u0101maina nevienai citai lietotnes komponentei.<\/p>\n

      K\u0101 pievienot viet\u0113jo valsti<\/h2>\n

      T\u0101tad, k\u0101 pievienot \u0161o t\u0101 saukto lok\u0101lo st\u0101vokli klas\u0113, izmantojot React dz\u012bves cikls<\/strong>? \u0160eit ir vienk\u0101r\u0161a proced\u016bra:<\/p>\n

        \n
      1. Iestatiet s\u0101kotn\u0113jais st\u0101voklis<\/strong> pievienojot papildu klases konstruktoru, kas pie\u0161\u0137ir s\u0101kotn\u0113jais st\u0101voklis<\/strong>.<\/li>\n
      2. Radot klasi, inicializ\u0113jiet to ar k\u0101du objektu.<\/li>\n<\/ol>\n

        R\u016bp\u012bgi piev\u0113r\u0161ot uzman\u012bbu \u0161iem so\u013ciem un pa\u0146\u0113mieniem, j\u016bs varat viegli integr\u0113tReact dz\u012bves cikls<\/strong>\u2018 metodes<\/strong> j\u016bsu darba pl\u016bsm\u0101, atvieglojot ce\u013cojumu uz \u013coti dinamisku lietot\u0146u veido\u0161anu ar izcilu lietot\u0101ju mijiedarb\u012bbu.
        \nViet\u0113j\u0101 st\u0101vok\u013ca \u012bsteno\u0161ana ir iz\u0161\u0137iro\u0161a, kontrol\u0113jot komponenta uzved\u012bbu da\u017e\u0101dos dz\u012bves cikla segmentos reactjs - \u012bpa\u0161i mont\u0101\u017eas vai atjaunin\u0101\u0161anas f\u0101z\u0113s, kur komponents bija mount un getDerivedStateFromProps b\u016btiski iesaist\u012bties.<\/p>\n

        Kopum\u0101 zin\u0101\u0161anai, k\u0101 efekt\u012bvi izveidot un p\u0101rvald\u012bt viet\u0113j\u0101s valstis, ir b\u016btiska noz\u012bme, lai p\u0101rvar\u0113tu visus posmus, kas p\u0101rst\u0101v tipisku darba vietu. React dz\u012bves cikls<\/strong> diagrammu, nodro\u0161inot izstr\u0101d\u0101t\u0101jiem liel\u0101ku kontroli p\u0101r komponentu atveido\u0161anu un uz atjaunin\u0101\u0161anu balst\u012btu mijiedarb\u012bbu. T\u0101d\u0113j\u0101di j\u016bsu lietojumprogrammas k\u013c\u016bst ne tikai interakt\u012bvas, bet ar\u012b intuit\u012bvas gan no programm\u0113t\u0101ja, gan lietot\u0101ja perspekt\u012bvas.<\/p>\n

        Iek\u013caut dz\u012bves cikla metodes<\/strong> React klas\u0113 ir b\u016btiska da\u013ca, lai noteiktu, k\u0101 komponents uzved\u012bsies vis\u0101 t\u0101 darb\u012bbas laik\u0101 t\u012bmek\u013ca vietn\u0113. \u0160is process k\u013c\u016bst v\u0113l svar\u012bg\u0101ks, ja mums ir komponentes ar main\u012bgu st\u0101vokli un mums ir nepiecie\u0161ams nov\u0113rot to st\u0101vok\u013ca izmai\u0146as laika gait\u0101.<\/p>\n

        Vispirms ir noder\u012bgi apskat\u012bt \u0161os. metodes<\/strong> k\u0101 galvenie atskaites punkti, kas izkl\u0101sta m\u016bsu komponenta dz\u012bves st\u0101stu pla\u0161\u0101k\u0101 runtime sf\u0113r\u0101.<\/p>\n

        Dz\u012bves cikla pamatmetodes<\/h2>\n

        React konstruktori to atjaut\u012bgi apvelt\u012bja ar \u012bpa\u0161iem dz\u012bves cikla metodes<\/strong> piem\u0113ram, componentDidMount, shouldComponentUpdate un componentWillUnmount. T\u0101s tiek aktiviz\u0113tas da\u017e\u0101dos posmos.<\/p>\n

        Izpratne par \u0161iem sare\u017e\u0123\u012btajiem elementiem s\u0101kotn\u0113ji var \u0161\u0137ist sare\u017e\u0123\u012bta, ta\u010du nevajag uztraukties! Tikl\u012bdz tie saliksies kop\u0101 j\u016bsu sak\u0101mv\u0101rd\u0101, jums b\u016bs daudz liel\u0101ka elast\u012bba, izstr\u0101d\u0101jot j\u016bsu rea\u0123\u0113\u0161anas klases komponentus.<\/p>\n

        Atpaz\u012bstot b\u016btiskus posmus komponenta dz\u012bves cikl\u0101 (piem\u0113ram, mont\u0101\u017eu, atjaunin\u0101\u0161anu un atmoont\u0113\u0161anu), j\u016bs ieg\u016bstat papildu kanvu, lai efekt\u012bvi manipul\u0113tu ar datu pl\u016bsmu lietojumprogramm\u0101.<\/p>\n

        React joproj\u0101m aizrauj ar savu potenci\u0101lo att\u012bst\u012bbu - galu gal\u0101 \u0161odienas sare\u017e\u0123\u012bjumi var k\u013c\u016bt par r\u012btdienas lab\u0101ko praksi. Esiet zi\u0146k\u0101r\u012bgi par katru posmu React dz\u012bves cikls<\/strong>; tas patiesi ir skaists ce\u013cojums!<\/p>\n

        Pareiza valsts izmanto\u0161ana<\/h2>\n

        K\u0101 j\u016bs ce\u013cojat, lai izprastu React dz\u012bves cikls<\/strong>, tad svar\u012bg\u0101kais ir apg\u016bt valsts lieto\u0161anu. \u0160\u012b neaizst\u0101jam\u0101 sp\u0113ja React dz\u012bves cikls<\/strong> ir \u013coti svar\u012bga loma komponentu datu p\u0101rvald\u012bb\u0101 un \u0101tr\u0101 atjaunin\u0101\u0161an\u0101.
        \n\"St\u0101voklis\" b\u016bt\u012bb\u0101 ir dati, kas da\u017e\u0101dos veidos ietekm\u0113 atveido\u0161anu un nodro\u0161ina dinamiskas izmai\u0146as j\u016bsu komponent\u0113. Ir v\u0113rts atz\u012bm\u0113t ar\u012b t\u0101s at\u0161\u0137ir\u012bgo iez\u012bmi; at\u0161\u0137ir\u012bb\u0101 no rekviz\u012btiem, kas tiek nodoti no vec\u0101ku komponent\u0113m atvasin\u0101taj\u0101m, st\u0101voklis tiek p\u0101rvald\u012bts pa\u0161\u0101 komponent\u0113.<\/p>\n

          \n
        1. Inicializ\u0113\u0161ana: Defin\u0113jot savu Komponentu klase<\/strong>, laba prakse ir inicializ\u0113t st\u0101vokli j\u016bsu konstruktora metode<\/strong>.<\/li>\n
        2. Atjaunin\u0101\u0161ana: Izmantojiet this.setState(), nevis modific\u0113jiet this.state tie\u0161i. React var neatjaunin\u0101t st\u0101vokli uzreiz asinhron\u0101s dabas d\u0113\u013c, t\u0101p\u0113c vienm\u0113r pa\u013caujieties uz this.setState().<\/li>\n
        3. Piek\u013cuve valstij: Vienk\u0101r\u0161i izmantojiet this.state, lai piek\u013c\u016btu vai nolas\u012btu to.<\/li>\n<\/ol>\n

          Atcerieties, ka jebkuras izmai\u0146as komponenta st\u0101voklis<\/strong> vai rekviz\u012bti izraisa atk\u0101rtotu render\u0113\u0161anas procesu - ja vien funkcija shouldComponentUpdate() neatgrie\u017e false. T\u0101p\u0113c t\u016bl\u012bt\u0113jus atjaunin\u0101jumus vislab\u0101k veicin\u0101s, izsaucot setState.<\/p>\n

          Asinhronie atjaunin\u0101jumi<\/h2>\n

          Viens no bie\u017ei aizmirstajiem aspektiem dz\u012bves cikla izp\u0113tes agr\u012bnajos posmos ir tas, k\u0101 asinhronie atjaunin\u0101jumi darbojas Stateless Funkcion\u0101lie komponenti<\/strong> sal\u012bdzin\u0101jum\u0101 ar klases komponentiem. Paties\u012bb\u0101 setState darb\u012bbas nesola t\u016bl\u012bt\u0113jas izmai\u0146as 'state' objekt\u0101, bet rada gaid\u0101mo st\u0101vok\u013ca p\u0101reju.
          \nTas prec\u012bzi paskaidro, ka vair\u0101kus \"setState\" izsaukumus veiktsp\u0113jas apsv\u0113rumu d\u0113\u013c potenci\u0101li var\u0113tu grup\u0113t, kas ir b\u016btiska iez\u012bme, \u0146emot v\u0113r\u0101 t\u0101s ietekmi uz to, k\u0101 m\u0113s sprie\u017eam par. kods<\/a> sekvencera oper\u0101cijas, kas mijiedarbojas ar sare\u017e\u0123\u012bt\u0101kiem nosac\u012bjumiem, manipul\u0113jot ar m\u016bsu s\u0101kotn\u0113jais st\u0101voklis<\/strong> objekts.<\/p>\n

          Nobeigum\u0101 j\u0101secina, ka piesardz\u012bga pieeja \"valsts\" lietojumam neap\u0161aub\u0101mi var pal\u012bdz\u0113t izstr\u0101d\u0101t \u013coti efekt\u012bvas lietot\u0101ja saskarnes, vienlaikus uzlabojot manu ce\u013cojumu cauri. React dz\u012bves cikls<\/strong> m\u0101c\u012b\u0161an\u0101s l\u012bkne.<\/p>","protected":false},"excerpt":{"rendered":"

          Ieg\u016bstiet gal\u012bgo ce\u013cvedi par React dz\u012bves cikla metod\u0113m un uzziniet, k\u0101 maksim\u0101li izmantot savus komponentus. Spiediet \u0161eit, lai sa\u0146emtu viegli uztveramu pam\u0101c\u012bbu!<\/p>","protected":false},"author":2,"featured_media":3189,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-3188","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-scaleups-solutions"],"acf":[],"yoast_head":"\nEasy Guide to React Lifecycle - The Codest<\/title>\n<meta name=\"description\" content=\"Get the ultimate guide to React's lifecycle methods and learn how to make the most of your components.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thecodest.co\/lv\/emuars\/vienkarss-celvedis-par-react-dzives-ciklu\/\" \/>\n<meta property=\"og:locale\" content=\"lv_LV\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Easy Guide to React Lifecycle\" \/>\n<meta property=\"og:description\" content=\"Get the ultimate guide to React's lifecycle methods and learn how to make the most of your components.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thecodest.co\/lv\/emuars\/vienkarss-celvedis-par-react-dzives-ciklu\/\" \/>\n<meta property=\"og:site_name\" content=\"The Codest\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-08T09:07:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-05T10:49:33+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thecodest.co\/app\/uploads\/2024\/05\/simple_walkthrough__of_react_component__lifecycle-1-.png\" \/>\n\t<meta property=\"og:image:width\" content=\"960\" \/>\n\t<meta property=\"og:image:height\" content=\"540\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"thecodest\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"thecodest\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/easy-guide-to-react-lifecycle\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/easy-guide-to-react-lifecycle\\\/\"},\"author\":{\"name\":\"thecodest\",\"@id\":\"https:\\\/\\\/thecodest.co\\\/#\\\/schema\\\/person\\\/7e3fe41dfa4f4e41a7baad4c6e0d4f76\"},\"headline\":\"Easy Guide to React Lifecycle\",\"datePublished\":\"2023-05-08T09:07:15+00:00\",\"dateModified\":\"2026-03-05T10:49:33+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/easy-guide-to-react-lifecycle\\\/\"},\"wordCount\":2271,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/thecodest.co\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/easy-guide-to-react-lifecycle\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/thecodest.co\\\/app\\\/uploads\\\/2024\\\/05\\\/simple_walkthrough__of_react_component__lifecycle-1-.png\",\"articleSection\":[\"Enterprise & Scaleups Solutions\"],\"inLanguage\":\"lv\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/thecodest.co\\\/blog\\\/easy-guide-to-react-lifecycle\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/easy-guide-to-react-lifecycle\\\/\",\"url\":\"https:\\\/\\\/thecodest.co\\\/blog\\\/easy-guide-to-react-lifecycle\\\/\",\"name\":\"Easy Guide to React Lifecycle - 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