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我想獲取可觀察數組中的值並將其顯示在下拉列表中,但我不想將下拉列表中的值更新爲可觀察數組更改?由於其他原因,該陣列必須是可觀察的。從可觀察數組中敲除+填充值,但在數組更新時不更新值
我知道會有一個簡單的方法來做到這一點!
這裏是一個fiddle來解釋我的意思和代碼如下。
視圖模型:
ViewModel = function() {
var self = this;
self.Owners = ko.observableArray([
{FullName: 'Bob Jones',Id: 1},
{FullName: 'Joe Bloggs',Id: 2},
{FullName: 'Joe Bloggs',Id: 2}
]);
self.GetOwners = function() {
var ownerIds = [],
addedIds = [],
count = 0;
var owners = ko.utils.arrayForEach(self.Owners(), function (owner) {
if (addedIds.indexOf(owner.Id) == -1) {
addedIds[count] = owner.Id;
ownerIds[count] = {
FullName: owner.FullName,
Id: owner.Id
};
count++;
}
});
return ownerIds;
}
self.Add = function() {
self.Owners.push({ FullName: 'Jane Doe', Id: 3 });
}
};
var vm = new ViewModel();
ko.applyBindings(vm);
HTML:
<select data-bind="options: GetOwners(), optionsText: 'FullName', optionsValue: 'Id'"> </select>
<!-- I dont want the values in this select to update when I add an owner by clicking the button below -->
<button data-bind="click: Add">Add</button>
好主意,太簡單了!感謝那。 – Colin 2013-02-17 08:49:59