我在knockoutjs中有一些继承的问题。我得到了下一个结果
- name1(id1)
- name6(id6)
- name6(id6)
- name6(id6)
- name6(id6)
- name6(id6)
<ul>
<li data-bind="text: name() + ' (' + id() + ')'"></li>
<ul data-bind="template: { name: 'nodeTree', foreach: nodes }">
</ul>
</ul>
<script type="text/html" id="nodeTree">
<li data-bind="text: name() + ' (' + id() + ')'"></li>
<ul data-bind="template: { name: 'nodeTree', foreach: nodes }">
</ul>
</script>
<script>
var TreeNode = function () {
var self = this;
self.id = ko.observable();
self.name = ko.observable();
self.nodes = ko.observableArray();
}
var RootNode = function () {
var self = this;
self.id(dataModel.id);
self.name(dataModel.name);
self.nodes = ko.computed(function () {
return DataToArray(dataModel.component);
});
}
var ComponentNode = function (data) {
var self = this;
var that = new TreeNode();
if (data !== null) {
that.id(data.id);
that.name(data.name);
if (data.component && data.component.length > 0)
that.nodes = DataToArray(data.component);
}
}
ComponentNode.prototype = new TreeNode();
RootNode.prototype = new TreeNode();
function DataToArray(mass) {
var arr = [];
if (mass !== null) for (var i = 0; i < mass.length; i++) {
var obj = new ComponentNode(mass[i]);
arr.push(obj);
}
return arr;
}
var dataModel = {
id: "id1",
name: "name1",
component: [{
id: "id2",
name: "name2",
component: []
}, {
id: "id3",
name: "name3",
component: []
}, {
id: "id4",
name: "name4",
component: [{
id: "id5",
name: "name5",
component: []
}, {
id: "id6",
name: "name6",
component: []
}]
}]
};
ko.applyBindings(new RootNode());
</script>
我不明白为什么当 id 和 name 属性不可观察时,一切正常。 见http://jsfiddle.net/Ly81tbr4/7/
答案 0 :(得分:2)
您不希望将您的可观察量作为原型的一部分。这样做可以在对象的所有实例之间共享可观察的实例。每个实例的observable 必须唯一。
不是将observable添加到原型中,只需在子构造函数中调用父构造函数。
var TreeNode = function () {
this.id = ko.observable();
this.name = ko.observable();
this.nodes = ko.observableArray();
}
var RootNode = function (model) {
TreeNode.call(this);
...
}
var ComponentNode = function (data) {
TreeNode.call(this);
...
}