MVVM stands for Model-View-ViewModel, a architectural pattern commonly used infront-end development.

In Vue.js, the ViewModel is essentially a Vue instance that serves as the central bridge between the View (what users see) and the Model (data). This connection enables automatic synchronization of data changes to the UI.

Basic Implementation

Consider a navigation menu example where we render a list of transportation options:

<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Transportation Menu</title>
</head>
<body>
    <div id="transport-app">
        <nav>
            <a v-for="option in transportOptions">
                {{ option.name }}
            </a>
        </nav>
    </div>
    
    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
    <script>
        const app = new Vue({
            el: '#transport-app',
            data: {
                transportOptions: [
                    { name: 'Bus' },
                    { name: 'Express' },
                    { name: 'Premium' },
                    { name: 'Carpool' },
                    { name: 'Taxi' },
                    { name: 'Chauffeur' }
                ]
            }
        });
    </script>
</body>
</html>

Working with Vue.js essentially means defining each component of the MVVM pattern:

• View: The HTML template with Vue directives and expressions
• Model: The data objects defined in the data option
• ViewModel: The Vue instance that establishes the binding between View and Model

Data Binding Techniques

One-Time Binding

When you need to render data initially but don't want updates to reflect in the DOM, use the asterisk prefix:

<span>Static: {{* staticMessage }}</span>

This creates a one-time interpolation that won't update when the underlying data changes.

HTML Interpolation

Standard double curly braces escape HTML content automatically. To render raw HTML, use triple braces:

<div>HTML Content: {{{ rawHtml }}}</div>
// With data: rawHtml = '<strong>Highlighted Text</strong>'
// Renders as: HTML Content: <strong>Highlighted Text</strong>

Exrpession Support

The Mustache syntax ({{ }}) supports JavaScript expressions within the template:

<p>Calculation: {{ count * 2 + 10 }}</p>
<p>Ternary: {{ isActive ? 'Enabled' : 'Disabled' }}</p>
<p>Method call: {{ formatDate(timestamp) }}</p>

These expressions are evaluated at runtime and update reactively when dependencies change.