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Getting URL Parameters with AngularJS: A Comprehensive Guide

AngularJS, despite being superseded by Angular (without the "JS"), remains a powerful tool for many legacy applications. Understanding how to access URL parameters is a fundamental skill for working with AngularJS, as it's essential for handling dynamic content, routing, and various other functionalities. This tutorial will provide a comprehensive guide to accessing URL parameters in AngularJS, complete with explanations, code examples, and best practices.

*Why Use URL Parameters?*

URL parameters (also known as query parameters) are used to pass data to a web page through the URL. They typically follow the `?` symbol in the URL and are formatted as key-value pairs separated by `&`. For example:

`http://example.com/product?id=123&cat...`

In this URL:

`?` separates the base URL from the parameters.
`id=123` is the first parameter, with `id` being the key and `123` being the value.
`category=electronics` is the second parameter.
`color=blue` is the third parameter.

URL parameters are commonly used for:

*Passing identification information:* Like product IDs, user IDs, or article IDs.
*Filtering and sorting data:* Specifying search criteria or sort order.
*Pagination:* Indicating which page of results to display.
*Tracking campaigns:* Identifying the source of traffic to your website.
*Maintaining state:* Persisting data across page reloads or navigations.

*Methods for Accessing URL Parameters in AngularJS*

AngularJS offers several ways to access URL parameters. Here, we'll explore the most common and recommended approaches:

1. *`$routeParams` Service:*

*Purpose:* This is the most common and generally preferred method, especially when using AngularJS's routing mechanism (`$routeProvider` or its derivatives). `$routeParams` is designed to work seamlessly with route definitions, extracting parameters d ...

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