一個chosenColor
屬性添加到您的視圖模型,將在單擊每個「紅色/藍色」切換而改變。而且,使用自定義函數的值追加到每個<option>
的標題:
JS:
var vm = {
chosenColor: ko.observable('Red'),
chosenValue: ko.observable(),
getCaption: function(val) {
return val + ' ' + this.chosenColor()
}
};
ko.applyBindings(vm);
HTML:
<a href="javascript:;" class="a_red" data-bind="click: chosenColor.bind($data, 'Red')">Red</a>
<a href="javascript:;" class="a_blue" data-bind="click: chosenColor.bind($data, 'Blue')">Blue</a>
<select data-bind="value: chosenValue">
<option value="25" data-bind="text: getCaption(25)"></option>
<option value="50" data-bind="text: getCaption(50)"></option>
<option value="100" data-bind="text: getCaption(100)"></option>
<option value="200" data-bind="text: getCaption(200)"></option>
</select>
見Fiddle
此外,更好的基於敲除的方法將是:
var qtys = [25,50,100,200];
function viewModel() {
var self = this;
this.chosenColor = ko.observable('Red');
this.chosenValue = ko.observable();
this.generateOptions = function(vm) {
return qtys.map(function(q) {
return { value: q,
caption: q + ' ' + self.chosenColor() };
})
}
};
ko.applyBindings(new viewModel());
而且
<a href="javascript:;" class="a_red" data-bind="click: chosenColor.bind($data, 'Red')">Red</a>
<a href="javascript:;" class="a_blue" data-bind="click: chosenColor.bind($data, 'Blue')">Blue</a>
<select data-bind="value: chosenValue,
options: generateOptions(),
optionsValue: 'value',
optionsText: 'caption'">
</select>
見Fiddle
你能告訴我們你到目前爲止所嘗試過的嗎? – Nirnae