{"id":14731,"date":"2025-03-10T04:30:16","date_gmt":"2025-03-10T01:30:16","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/knockout-jsde-hesaplanmis-gozlemlenebilirler-olusturma-ve-yonetim\/"},"modified":"2025-03-10T04:30:16","modified_gmt":"2025-03-10T01:30:16","slug":"knockout-jsde-hesaplanmis-gozlemlenebilirler-olusturma-ve-yonetim","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/knockout-jsde-hesaplanmis-gozlemlenebilirler-olusturma-ve-yonetim\/","title":{"rendered":"Knockout.js’de Hesaplanm\u0131\u015f G\u00f6zlemlenebilirler: Olu\u015fturma ve Y\u00f6netim"},"content":{"rendered":"

Knockout.js’de Hesaplanm\u0131\u015f G\u00f6zlemlenebilirler: Olu\u015fturma ve Y\u00f6netim<\/p>\n

Knockout.js, JavaScript uygulamalar\u0131nda veri ba\u011flamay\u0131 kolayla\u015ft\u0131ran g\u00fc\u00e7l\u00fc bir k\u00fct\u00fcphanedir. Bu k\u00fct\u00fcphane, verilerdeki de\u011fi\u015fiklikleri otomatik olarak kullan\u0131c\u0131 aray\u00fcz\u00fcne yans\u0131tmay\u0131 sa\u011flar. Ancak, bazen verilerimiz do\u011frudan g\u00f6zlemlenebilir olmaktan ziyade, di\u011fer g\u00f6zlemlenebilirlerin hesaplanmas\u0131yla elde edilen de\u011ferlerden olu\u015fabilir. \u0130\u015fte burada hesaplanm\u0131\u015f g\u00f6zlemlenebilirler devreye girer.<\/p>\n

Hesaplanm\u0131\u015f g\u00f6zlemlenebilirler (computed observables), di\u011fer g\u00f6zlemlenebilirlerin de\u011ferlerine ba\u011fl\u0131 olarak hesaplanan ve bu de\u011ferler de\u011fi\u015fti\u011finde otomatik olarak g\u00fcncellenen \u00f6zel g\u00f6zlemlenebilirlerdir. Bu sayede, karma\u015f\u0131k veri d\u00f6n\u00fc\u015f\u00fcmlerini ve hesaplamalar\u0131 kolayl\u0131kla y\u00f6netebilir, kodumuzu daha temiz ve daha okunabilir hale getirebiliriz. \u00d6rne\u011fin, bir al\u0131\u015fveri\u015f sepetinde bulunan \u00fcr\u00fcnlerin toplam fiyat\u0131n\u0131 hesaplamak i\u00e7in hesaplanm\u0131\u015f g\u00f6zlemlenebilirleri kullanabiliriz.<\/p>\n

Hesaplanm\u0131\u015f G\u00f6zlemlenebilir Olu\u015fturma<\/h2>\n

Knockout.js’de bir hesaplanm\u0131\u015f g\u00f6zlemlenebilir olu\u015fturmak olduk\u00e7a basittir. ko.computed<\/code> fonksiyonunu kullanarak, hesaplama mant\u0131\u011f\u0131n\u0131 i\u00e7eren bir fonksiyon tan\u0131mlar\u0131z. Bu fonksiyon, ba\u011f\u0131ml\u0131 oldu\u011fu di\u011fer g\u00f6zlemlenebilirleri parametre olarak alabilir ve bunlar\u0131n de\u011ferlerine g\u00f6re bir sonu\u00e7 \u00fcretir. A\u015fa\u011f\u0131daki \u00f6rnekte, iki say\u0131n\u0131n toplam\u0131n\u0131 hesaplayan bir hesaplanm\u0131\u015f g\u00f6zlemlenebilir olu\u015fturulmu\u015ftur:<\/p>\n

\nlet viewModel = {\n    sayi1: ko.observable(10),\n    sayi2: ko.observable(20),\n    toplam: ko.computed(function() {\n        return this.sayi1() + this.sayi2();\n    }, this)\n};\n\nko.applyBindings(viewModel);\n<\/code><\/pre>\n
Bu \u00f6rnekte, toplam<\/code> isimli hesaplanm\u0131\u015f g\u00f6zlemlenebilir,  sayi1<\/code> ve sayi2<\/code> g\u00f6zlemlenebilirlerinin de\u011ferlerine ba\u011fl\u0131d\u0131r.  sayi1<\/code> veya sayi2<\/code>‘nin de\u011feri de\u011fi\u015fti\u011finde, toplam<\/code> g\u00f6zlemlenebiliri otomatik olarak g\u00fcncellenir.  this<\/code> ba\u011flam\u0131n\u0131 kullanarak, viewModel i\u00e7indeki di\u011fer g\u00f6zlemlenebilirleri eri\u015febiliyoruz. Bu, \u00f6zellikle daha b\u00fcy\u00fck view modellerinde \u00f6nemlidir.<\/p>\n
Ba\u011f\u0131ml\u0131 G\u00f6zlemlenebilirlerin Y\u00f6netimi<\/h2>\n
Bir hesaplanm\u0131\u015f g\u00f6zlemlenebilir, birden fazla g\u00f6zlemlenebilire ba\u011f\u0131ml\u0131 olabilir.  Bu durumda,  ba\u011f\u0131ml\u0131 g\u00f6zlemlenebilirlerden herhangi birinin de\u011feri de\u011fi\u015fti\u011finde hesaplanm\u0131\u015f g\u00f6zlemlenebilir yeniden hesaplan\u0131r.  Bu, performans\u0131 etkileyebilece\u011finden, gereksiz hesaplamalar\u0131 \u00f6nlemek i\u00e7in dikkatli olmak \u00f6nemlidir.  \u00d6rne\u011fin,  bir hesaplamaya gerek duyulmayan durumlarda, hesaplamay\u0131 \u00f6nlemek i\u00e7in ko\u015fullu ifadeler kullan\u0131labilir.<\/p>\n
Hesaplanm\u0131\u015f G\u00f6zlemlenebilirlerde Hata Y\u00f6netimi<\/h2>\n
Hesaplama s\u0131ras\u0131nda bir hata olu\u015fabilir.  Bu hatalar\u0131 yakalamak ve kullan\u0131c\u0131ya uygun bir mesaj g\u00f6stermek i\u00e7in  try...catch<\/code> bloklar\u0131n\u0131 kullanabiliriz.  A\u015fa\u011f\u0131daki \u00f6rnekte,  bir hesaplama s\u0131ras\u0131nda olu\u015fabilecek bir hatay\u0131 yakalayan bir hesaplanm\u0131\u015f g\u00f6zlemlenebilir g\u00f6sterilmi\u015ftir:<\/p>\n
\nlet viewModel = {\n    deger: ko.observable(0),\n    sonuc: ko.computed(function() {\n        try {\n            return 10 \/ this.deger();\n        } catch (hata) {\n            return \"Hata olu\u015ftu: \" + hata.message;\n        }\n    }, this)\n};\n\nko.applyBindings(viewModel);\n<\/code><\/pre>\n
Bu \u00f6rnekte,  e\u011fer deger<\/code> 0 ise,  b\u00f6lme i\u015flemi s\u0131ras\u0131nda bir hata olu\u015fur ve bu hata yakalanarak kullan\u0131c\u0131ya bildirilir.  Bu sayede,  uygulaman\u0131n beklenmedik hatalardan dolay\u0131 \u00e7\u00f6kmesini \u00f6nleriz.  Uygulaman\u0131n daha sa\u011flam ve g\u00fcvenilir olmas\u0131n\u0131 sa\u011flar.<\/p>\n
Performans Optimizasyonu<\/h2>\n
\u00c7ok say\u0131da ba\u011f\u0131ml\u0131 g\u00f6zlemlenebilir bulunan karma\u015f\u0131k hesaplamalar, performans sorunlar\u0131na yol a\u00e7abilir.  Bu durumlarda,  performans\u0131 iyile\u015ftirmek i\u00e7in \u00e7e\u015fitli teknikler kullan\u0131labilir.  \u00d6rne\u011fin,  ko.pureComputed<\/code> kullanarak,  ba\u011f\u0131ml\u0131 g\u00f6zlemlenebilirlerin de\u011ferleri de\u011fi\u015fmedi\u011fi s\u00fcrece hesaplaman\u0131n tekrar yap\u0131lmas\u0131n\u0131 \u00f6nleyebiliriz.  Ayr\u0131ca,  gereksiz hesaplamalar\u0131 azaltmak i\u00e7in  ko\u015fullu ifadeler ve \u00f6nbellekleme teknikleri de kullan\u0131labilir. Daha detayl\u0131 bilgi i\u00e7in fatihsoysal.com<\/a> adresini ziyaret edebilirsiniz.<\/p>\n
Sonu\u00e7 olarak, Knockout.js’deki hesaplanm\u0131\u015f g\u00f6zlemlenebilirler,  karma\u015f\u0131k veri d\u00f6n\u00fc\u015f\u00fcmlerini ve hesaplamalar\u0131n\u0131 kolayl\u0131kla y\u00f6netmemizi sa\u011flayan g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r.  Uygun \u015fekilde kullan\u0131ld\u0131\u011f\u0131nda,  kodumuzun daha temiz, daha okunabilir ve daha performansl\u0131 olmas\u0131na katk\u0131da bulunur.  Ancak,  performans sorunlar\u0131n\u0131 \u00f6nlemek i\u00e7in dikkatli olmak ve gerekti\u011finde optimizasyon tekniklerini uygulamak \u00f6nemlidir.<\/p>\n
Daha fazla bilgi i\u00e7in Knockout.js resmi d\u00f6k\u00fcmanlar\u0131na g\u00f6z atabilirsiniz: https:\/\/knockoutjs.com\/documentation\/computedObservables.html<\/a><\/p>\n
#Etiketler: Knockout.js, Hesaplanm\u0131\u015f G\u00f6zlemlenebilirler, Computed Observables, JavaScript, Veri Ba\u011flama,  Observable,  Performans Optimizasyonu, Hata Y\u00f6netimi,  ko.computed, ko.pureComputed<\/p>\n","protected":false},"excerpt":{"rendered":"Knockout.js’de Hesaplanm\u0131\u015f G\u00f6zlemlenebilirler: Olu\u015fturma ve Y\u00f6netim Knockout.js, JavaScript uygulamalar\u0131nda veri ba\u011flamay\u0131 kolayla\u015ft\u0131ran g\u00fc\u00e7l\u00fc bir k\u00fct\u00fcphanedir. Bu k\u00fct\u00fcphane, verilerdeki…","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-14731","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\nKnockout.js'de Hesaplanm\u0131\u015f G\u00f6zlemlenebilirler: Olu\u015fturma ve Y\u00f6netim<\/title>\n<meta name=\"description\" content=\"Knockout.js, JavaScript uygulamalar\u0131nda veri ba\u011flamay\u0131 kolayla\u015ft\u0131ran g\u00fc\u00e7l\u00fc bir k\u00fct\u00fcphanedir. Bu k\u00fct\u00fcphane, verilerdeki de\u011fi\u015fiklikleri otomatik olarak kullan\u0131c\u0131 aray\u00fcz\u00fcne yans\u0131tmay\u0131 sa\u011flar. Ancak, bazen verilerimiz do\u011frudan g\u00f6zlemlenebilir olmaktan ziyade, di\u011fer g\u00f6zlemlenebilirlerin hesaplanmas\u0131yla elde edilen de\u011ferlerden olu\u015fabilir. \u0130\u015fte burada hesaplanm\u0131\u015f g\u00f6zlemlenebilirler devreye girer.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/knockout-jsde-hesaplanmis-gozlemlenebilirler-olusturma-ve-yonetim\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Knockout.js'de Hesaplanm\u0131\u015f G\u00f6zlemlenebilirler: Olu\u015fturma ve Y\u00f6netim\" \/>\n<meta property=\"og:description\" content=\"Knockout.js, JavaScript uygulamalar\u0131nda veri ba\u011flamay\u0131 kolayla\u015ft\u0131ran g\u00fc\u00e7l\u00fc bir k\u00fct\u00fcphanedir. 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