[英]Ajax data binding using Knockout Js
我正在使用淘汰賽 js ,我發現在 ajax get 方法中很難綁定數據,我已經創建了模型、viewModel 和 ajax 函數,我在創建 viewModel 的同一個 js 文件中有 ajax 方法我正在調用頁面加載上的ajax並嘗試將我的html與konckout js綁定,如果我在ajax調用之前,在ajax調用之后給出this.name = ko.observale(result[0].name)
,我會收到錯誤userModel is undefined
它給出的name is undefined
需要幫助
<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 });
}
});
這是我的建議,即擁有一個干凈的嵌套視圖模型。
示例: 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());
看法 :
<h1 data-bind="foreach: UsersList">
<div data-bind="text: Name"></div>
<div data-bind="text: UserName"></div>
</h1>
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