Conceito básico Knockoutjs

Conceito básico Knockoutjs

by barbados22

HTML

<script src="https://ajax.aspnetcdn.com/ajax/knockout/knockout-3.3.0.js"></script>
<!-- This is a *view* - HTML markup that defines the appearance of your UI -->

<p>First name: <strong data-bind="text: firstName"></strong></p>
<p>Last name: <strong data-bind="text: lastName"></strong></p>
<p>Full name: <strong data-bind="text: fullName"></strong></p>

<p>First name: <input data-bind="value: firstName" /></p>
<p>Last name: <input data-bind="value: lastName" /></p>

<button data-bind="click: capitalizeLastName">Go caps</button>

JavaScript

// This is a simple *viewmodel* - JavaScript that defines the data and behavior of your UI
function AppViewModel() {
    this.firstName = ko.observable("");
    this.lastName = ko.observable("");
    this.fullName = ko.computed(function() {
        return this.firstName() + " " + this.lastName();    
    }, this);
    
    this.capitalizeLastName = function(){
        var currentVal = this.lastName(); //read the current value
        this.lastName(currentVal.toUpperCase()); //White back a modified value
    };
}

// Activates knockout.js
ko.applyBindings(new AppViewModel());