使用Knockout Js进行Ajax数据绑定 [英] Ajax data binding using Knockout Js
问题描述
我正在使用 knockout js ，我发现难以绑定数据，而在ajax get方法中，我创建了model，viewModel和ajax函数，我有同样的ajax方法我创建了viewModel的js文件我在页面加载时调用ajax并尝试将我的html与konckout js绑定，我收到错误 userModel未定义如果我给 this.name = ko.observale（result [0] .name）在ajax调用之前，ajax调用后给出 name is undefined 需要帮助
i am using the knockout js, i am finding diffcult to bind the data while in ajax get method, i have created model, viewModel, and ajax function, i have the ajax method in the same js file where i have created viewModel i am calling the ajax on page load and trying to bind my html with konckout js, i am getting the error userModel is undefined if i give this.name = ko.observale(result[0].name) before the ajax call, after the ajax called it give name is undefined need help
<html>
<head>
<script src="js/jquery1.9.js"></script>
<script src="js/knockout-3.3.0.js"></script>
<script src="js/knockout.mapping.js"></script>
<script src="model/usermodel.js"></script>
</head>
<body>
<div>
<h1><span data-bind="text:user().name"></span></h1>
<h1><span data-bind="text:user().userName"></span></h1>
</div>
<script src="ViewModel/userDetailsViewModel.js"></script>
</body>
</html>
////Model////
function userModel(result) {
var self = this;
this.name = ko.observable(result[0].name); /// give me error undefined before the ajax call and after ajax call i get the value in result
this.userName = ko.observable();
}
/////View Model////
var result
var userDetailsViewModel = function(result) {
self = this;
self.user = ko.observable(new userModel(result));
};
var mainUserDetailsViewModel = new userDetailsViewModel(result);
ko.applyBindings(mainUserDetailsViewModel);
////ajax called on the page load ////
$.ajax({
type: "POST",
dataType: "json",
url: baseUrl + 'api/xx/xxx',
data: jason.strigfy(),
success: function(data) {
result = data;
////I am getting in result json data object 0=["name":"nnnn","Username":"mmmmmm"],
//// i am passing this result to ViewModel and to Usermodel Constructor//
mainUserDetailsViewModel.user(new userModel(result));
},
error: function(error) {
jsonValue = jQuery.parseJSON(error.responseText);
//jError('An error has occurred while saving the new part source: ' + jsonValue, { TimeShown: 3000 });
}
});
推荐答案
这是我建议有一个干净的嵌套视图模型。
示例： https://jsfiddle.net/kyr6w2x3/28/
Here is my suggestion to have a clean nested view model.
Example : https://jsfiddle.net/kyr6w2x3/28/
function UserViewModel() {
var self = this;
self.UsersList = ko.observableArray([]);
self.GetUsers = function() {
$.ajax({
type: "POST",
dataType: "json",
url: baseUrl + 'api/xx/xxx',
data: jason.strigfy(),
success: function (data) {
//Here you map and create a new instance of userDetailVM
self.UsersList($.map(data, function (user) {
return new UserDetailViewModel(user);
}));
}
});
}
//call to get users list when the VM is loading or you can call it on any event on your model
self.GetUsers();
}
function UserDetailViewModel(data){
var self = this;
self.Name = ko.observable(data.name);
self.UserName = ko.observable(data.username);
}
ko.applyBindings(new UserViewModel());
查看：
<h1 data-bind="foreach: UsersList">
<div data-bind="text: Name"></div>
<div data-bind="text: UserName"></div>
</h1>
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