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[英]How to access an observable element from observable array in knockout.js and change its value
[英]With knockout.js how to refresh observable array in a Select element
加載下拉列表后,將正確填充項目。 但是,當我單擊“刷新”按鈕時,下拉菜單項不會被刷新。 單擊刷新按鈕無法進行數據綁定。 單擊“刷新”按鈕后,我希望看到“瑪麗”和“桑德拉”。
這是JavaScript:
$(function () {
function viewModel() {
var self = this;
self.persons = ko.observableArray([]);
self.persons.push({
id: 1,
name: 'John'
});
self.persons.push({
id: 2,
name: 'Paul'
});
self.refreshPersonList = function () {
self.persons = ko.observableArray([]);
self.persons.push({ id: 3, name: 'Mary' });
self.persons.push({ id: 4, name: 'Sandra' });
};
}
ko.applyBindings(new viewModel());
});
和HTML:
<select data-bind="options: $root.persons(), optionsValue: 'id', optionsText: 'name'"></select>
<button value="Refresh" data-bind="event: {click : $root.refreshPersonList() }">Refresh Person List</button>
在這里,您正在創建一個新的數組,打破了現有的綁定:
self.persons = ko.observableArray([]);
嘗試清空數組:
self.refreshPersonList = function () {
self.persons.removeAll(); //Empty array
self.persons.push({ id: 3, name: 'Mary' });
self.persons.push({ id: 4, name: 'Sandra' });
};
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