在本節(jié),你將添加讓用戶可以創(chuàng)建新book的功能。在app.js中,添加如下代碼到視圖模型:
self.authors = ko.observableArray();
self.newBook = {
Author: ko.observable(),
Genre: ko.observable(),
Price: ko.observable(),
Title: ko.observable(),
Year: ko.observable()
}
var authorsUri = '/api/authors/';
function getAuthors() {
ajaxHelper(authorsUri, 'GET').done(function (data) {
self.authors(data);
});
}
self.addBook = function (formElement) {
var book = {
AuthorId: self.newBook.Author().Id,
Genre: self.newBook.Genre(),
Price: self.newBook.Price(),
Title: self.newBook.Title(),
Year: self.newBook.Year()
};
ajaxHelper(booksUri, 'POST', book).done(function (item) {
self.books.push(item);
});
}
getAuthors();
在Index.cshtml中,替換以下代碼:
<div class="col-md-4">
<!-- TODO: Add new book -->
</div>
到:
<div class="col-md-4">
<div class="panel panel-default">
<div class="panel-heading">
<h2 class="panel-title">Add Book</h2>
</div>
<div class="panel-body">
<form class="form-horizontal" data-bind="submit: addBook">
<div class="form-group">
<label for="inputAuthor" class="col-sm-2 control-label">Author</label>
<div class="col-sm-10">
<select data-bind="options:authors, optionsText: 'Name', value: newBook.Author"></select>
</div>
</div>
<div class="form-group" data-bind="with: newBook">
<label for="inputTitle" class="col-sm-2 control-label">Title</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="inputTitle" data-bind="value:Title"/>
</div>
<label for="inputYear" class="col-sm-2 control-label">Year</label>
<div class="col-sm-10">
<input type="number" class="form-control" id="inputYear" data-bind="value:Year"/>
</div>
<label for="inputGenre" class="col-sm-2 control-label">Genre</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="inputGenre" data-bind="value:Genre"/>
</div>
<label for="inputPrice" class="col-sm-2 control-label">Price</label>
<div class="col-sm-10">
<input type="number" step="any" class="form-control" id="inputPrice" data-bind="value:Price"/>
</div>
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
</div>
</div>
</div>
這段代碼創(chuàng)建了一個表單,用于提交新的作者。作者下拉框的值被數(shù)據(jù)綁定到視圖模型的authors中。對于其他的表單輸入,這些值都被數(shù)據(jù)綁定到視圖模型的newBook屬性。
這個表單上的提交事件被數(shù)據(jù)綁定到addBook函數(shù):
<form class="form-horizontal" data-bind="submit: addBook">
這個addBook函數(shù)讀取數(shù)據(jù)綁定表單輸入中的當(dāng)前值,并創(chuàng)建JSON對象。然后會POST這個JSON對象到/api/books。