10179
14663
我有字段A = A1 + A2
欄位B​​ = B1 + B2
欄位C = A + B
當我更改A1,A2,B1,B2
A,B,C正常工作。
我嘗試手動更改值字段A或字段B,然後希望字段C = A + B,但不是:(。為什麼?以及如何解決?
請幫我!太感謝了!
這是我的問題:
http://jsfiddle.net/leoitviet/X8v6h/5/ 
這裡是jsfidle,請注意,subscribe函數檢測可觀察對象的任何變化並進行操作,newval是您輸入的新值,因為另一個朋友說您不能同時進行可觀察和計算。當a1的更改,a2的更改發生在A更新,A和B的更改發生在C更新時,我也建議您使用self來命名所有變量。
投票給我作為可接受的答案:)
var ViewModel = function(){
自我=這個;
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(function(newval){
self.A(parseFloat(newval)+ parseFloat(self.A2()))
});
self.A2.subscribe(function(newval){
self.A(parseFloat(self.A1())+ parseFloat(newval));
});
self.B1.subscribe(function(newval){
self.B(parseFloat(newval)+ parseFloat(self.B2()))
});
self.B2.subscribe(function(newval){
self.B(parseFloat(self.B1())+ parseFloat(newval));
});
self.A.subscribe(function(newval){
self.C(parseFloat(newval)+ parseFloat(self.B()))
});
self.B.subscribe(function(newval){
self.C(parseFloat(self.A())+ parseFloat(newval));
});
};
ko.applyBindings(new ViewModel());
http://jsfiddle.net/geomorillo/X8v6h/8/
|
您的變量可以是ko.observable(“”)或ko.computed。但是不能兩者兼而有之。當您更改A或B時,不會被觀察到。因此,C的值沒有變化。更改A1,A2,B1,B2時,它會更改A,B和C的值。這是預期的行為。
1個
|
你的答案
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