Contacts editor example
This examples shows a fairly typical way to edit a nested data structure. Check the HTML source code to see how simple the viewmodel is, and how straightforward it is to bind the view to it.
Live example
Source code: View
<h2>Contacts</h2>
<div id='contactsList'>
<table class='contactsEditor'>
<tr>
<th>First name</th>
<th>Last name</th>
<th>Phone numbers</th>
</tr>
<tbody data-bind="foreach: contacts">
<tr>
<td>
<input data-bind='value: firstName' />
<div><a href='#' data-bind='click: $root.removeContact'>Delete</a></div>
</td>
<td><input data-bind='value: lastName' /></td>
<td>
<table>
<tbody data-bind="foreach: phones">
<tr>
<td><input data-bind='value: type' /></td>
<td><input data-bind='value: number' /></td>
<td><a href='#' data-bind='click: $root.removePhone'>Delete</a></td>
</tr>
</tbody>
</table>
<a href='#' data-bind='click: $root.addPhone'>Add number</a>
</td>
</tr>
</tbody>
</table>
</div>
<p>
<button data-bind='click: addContact'>Add a contact</button>
<button data-bind='click: save, enable: contacts().length > 0'>Save to JSON</button>
</p>
<textarea data-bind='value: lastSavedJson' rows='5' cols='60' disabled='disabled'> </textarea>
Source code: View model
var initialData = [
{ firstName: "Danny", lastName: "LaRusso", phones: [
{ type: "Mobile", number: "(555) 121-2121" },
{ type: "Home", number: "(555) 123-4567"}]
},
{ firstName: "Sensei", lastName: "Miyagi", phones: [
{ type: "Mobile", number: "(555) 444-2222" },
{ type: "Home", number: "(555) 999-1212"}]
}
];
var ContactsModel = function(contacts) {
var self = this;
self.contacts = ko.observableArray(ko.utils.arrayMap(contacts, function(contact) {
return { firstName: contact.firstName, lastName: contact.lastName, phones: ko.observableArray(contact.phones) };
}));
self.addContact = function() {
self.contacts.push({
firstName: "",
lastName: "",
phones: ko.observableArray()
});
};
self.removeContact = function(contact) {
self.contacts.remove(contact);
};
self.addPhone = function(contact) {
contact.phones.push({
type: "",
number: ""
});
};
self.removePhone = function(phone) {
$.each(self.contacts(), function() { this.phones.remove(phone) })
};
self.save = function() {
self.lastSavedJson(JSON.stringify(ko.toJS(self.contacts), null, 2));
};
self.lastSavedJson = ko.observable("")
};
ko.applyBindings(new ContactsModel(initialData));