可以在knockout.js中使用带有多个参数的extenders
示例:
ko.extenders.currency = function(target, currencySymbol, position) {
var result = ko.computed({
read: target,
write: function(newValue) {
var current = target(),
if (position == 'left') {
target(currencySymbol+target);
} else {
target(target+currencySymbol);
}
}
}).extend({ notify: 'always' });
但是我如何将它绑定到observable?
this.One = ko.observable(one).extend({ currency: ???, currencySymbol: '£', position : 'left'});
答案 0 :(得分:12)
您需要使用一个对象,例如:
ko.extenders.currency = function(target, options) {
var currencySymbol = options.symbol,
position = options.position;
var result = ko.computed({
read: target,
write: function(newValue) {
var current = target(),
if (position == 'left') {
target(currencySymbol+target);
} else {
target(target+currencySymbol);
}
}
}).extend({ notify: 'always' });
然后,你会这样称呼它:
this.One = ko.observable(one).extend({ currency: { symbol: '£', position : 'left' } });
或者如果您更喜欢更易读的代码:
var currencyOptions = { symbol: '£', position: 'left' };
this.One = ko.observable(one).extend({ currency: currencyOptions });