Introduction to Google Closure Library
Google Closure Library is an extensive and powerful JavaScript library that provides a wealth of tools for building complex web applications. With a broad range of APIs and utilities, it helps streamline the development process, ensuring code simplicity, consistency, and reliability.
Getting Started
To start using Google Closure Library, include the necessary scripts in your HTML file:
<script src="https://closure-library.googlecode.com/svn/trunk/closure/goog/base.js"></script>
APIs and Code Examples
String Utilities
The library offers multiple utilities to work with strings:
<script>
goog.require('goog.string');
var someString = 'hello world';
console.log(goog.string.toUpperCase(someString)); // Outputs: 'HELLO WORLD'
</script>
Array Utilities
Work with arrays using convenient methods from the library:
<script>
goog.require('goog.array');
var numbers = [1, 2, 3, 4, 5];
var sum = goog.array.reduce(numbers, function(sum, value) {
return sum + value;
}, 0);
console.log(sum); // Outputs: 15
</script>
DOM Manipulation
Manipulate the DOM with ease using the library’s DOM utilities:
<script>
goog.require('goog.dom');
var newDiv = goog.dom.createDom('div', {'style': 'background-color:#EEE'}, 'Hello, Closure!');
goog.dom.appendChild(document.body, newDiv);
</script>
Events
Handle DOM events consistently across browsers with the event handling utilities:
<script>
goog.require('goog.events');
var handler = function(e) {
console.log('Button clicked');
};
var button = document.getElementById('myButton');
goog.events.listen(button, goog.events.EventType.CLICK, handler);
</script>
Sample Application
Let’s create a simple application that interacts with various APIs we’ve discussed:
<html>
<head>
<script src="https://closure-library.googlecode.com/svn/trunk/closure/goog/base.js"></script>
</head>
<body>
<button id="myButton">Click me</button>
<script>
goog.require('goog.dom');
goog.require('goog.events');
// Button click handler
var handler = function(e) {
var newDiv = goog.dom.createDom('div', {'style': 'background-color:#EEE'}, 'Button clicked!');
goog.dom.appendChild(document.body, newDiv);
};
var button = document.getElementById('myButton');
goog.events.listen(button, goog.events.EventType.CLICK, handler);
</script>
</body>
</html>
By incorporating these tools and APIs, you can leverage the full power of Google Closure Library to create interactive, reliable, and performant web applications.
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