KnockoutJs المحسوبة لا تعمل مع آخر حقل محسوب

هنا هو jsfidle ، لاحظ وظيفة الاشتراك التي تكتشف أي تغييرات في ما يمكن ملاحظته وإجراء العملية ، newval هي القيمة الجديدة التي تدخلها ، كما قال الطرف الآخر ، لا يمكنك القيام بكل من الملاحظة والمحسوبة. عندما تحدث التغييرات في a1 ، يحدث a2 يتم تحديث A ، عندما تحدث التغييرات في A و B يتم تحديث C ، كما أوصي باستخدام self لتباعد أسماء جميع المتغيرات.
التصويت لي كإجابة مقبولة :)
var ViewModel = وظيفة () {
النفس = هذا ؛
self.A1 = ko.observable (0) ؛
self.B1 = ko.observable (0) ؛
self.A2 = ko.observable (0) ؛
self.B2 = ko.observable (0) ؛
self.A = ko.observable (0) ؛
self.B = ko.observable (0) ؛
self.C = ko.observable (0) ؛
self.A1.subscribe (وظيفة (newval) {
self.A (parseFloat (newval) + parseFloat (self.A2 ()))
}) ؛
self.A2.subscribe (وظيفة (newval) {
self.A (parseFloat (self.A1 ()) + parseFloat (newval)) ؛
}) ؛
self.B1.subscribe (وظيفة (newval) {
self.B (parseFloat (newval) + parseFloat (self.B2 ()))
}) ؛
self.B2.subscribe (وظيفة (newval) {
self.B (parseFloat (self.B1 ()) + parseFloat (newval)) ؛
}) ؛
self.A.subscribe (function (newval) {
self.C (parseFloat (newval) + parseFloat (self.B ()))
}) ؛
self.B.subscribe (وظيفة (newval) {
self.C (parseFloat (self.A ()) + parseFloat (newval)) ؛
}) ؛
} ؛
ko.applyBindings (new ViewModel ()) ؛
http://jsfiddle.net/geomorillo/X8v6h/8/
|
يمكن أن تكون المتغيرات الخاصة بك إما ko.observable ("") أو ko.computed. لكن لا يمكن أن يكون كلاهما. عندما تقوم بتغيير A أو B ، لا يتم ملاحظته. لذلك لا يوجد أي تغيير في قيمة C. عندما تقوم بتغيير A1 و A2 و B1 و B2 ، فإنه يغير قيمة A و B و C. هذا سلوك متوقع.
1
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