window location assign

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Location.assign()

The Location .assign()  method causes the window to load and display the document at the URL specified.

If the assignment can't happen because of a security violation, a DOMException of the SECURITY_ERROR type is thrown. This happens if the origin of the script calling the method is different from the origin of the page originally described by the Location object, mostly when the script is hosted on a different domain.

If the provided URL is not valid, a DOMException of the SYNTAX_ERROR type is thrown.

Specifications

Browser compatibility.

• The Location interface it belongs to.
• Similar methods: Location.replace() and Location.reload() .

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How to use window.location in JavaScript

The world of web development brims with tools and functions that enable developers to create seamless user experiences. Today, we delve into one of JavaScript’s essential objects: window.location . This object plays a pivotal role in managing the web page’s address and can be used for tasks such as page redirection, refreshing, and extracting URL information.

If you’re asking yourself, “What is window.location in JavaScript?” don’t worry. We’ve got you covered. Put simply, window.location is a property that gives you access to a Location object, containing information about the current URL and methods to manipulate it. Whether you want to redirect a user to a different page or just retrieve the current URL components, window.location is your go-to object in JavaScript.

In this article, we will walk you through the different aspects of window.location , including how to use it to interact with the web page’s URL. We will also take a look at its various properties and methods, ensuring you have all the information needed to leverage this powerful object in your projects.

What is window.location?

window.location offers several properties and methods you can use to read and manipulate the current page URL. Whether it’s the protocol, hostname, port, pathname, or query string, window.location provides an easy interface to work with all these components.

For instance, you might want to retrieve the current page’s protocol using window.location.protocol or the hostname via window.location.hostname . These properties offer granular control over the URL, allowing you to tailor the user experience based on the current location or redirect users as needed.

How to Use window.location to Redirect to a New Page

One of the most common uses of window.location is to redirect the user to a different webpage. This can be achieved straightforwardly using:

This line of code instructs the browser to navigate to ' https://www.example.com' ; . But there’s more to redirection than just changing the href property. Let’s explore the other methods like assign() and replace() and when to use them.

Methods Available for window.location

Window.location.assign().

The assign() method is used to navigate to a new URL and is equivalent to setting the window.location.href property:

One unique feature of using assign() is that it keeps the originating page in session history. This means users can press the browser’s back button to return to the original page, which is crucial for ensuring a user-friendly navigation experience.

window.location.replace()

If you intend for a page redirect to be final, with no option for the user to return to the previous page using the back button, the replace() method is what you need:

This method replaces the current resource with the new one in a way that it is not possible to go back.

window.location.reload()

When you want to reload the current page, window.location.reload() comes in handy. By default, this method reloads the page from the browser’s cache, but you can force a server reload by passing true as an argument:

This forces the browser to fetch the latest version of the page from the server.

Accessing URL Components

Beyond redirection, window.location is also incredibly useful for breaking down the URL into readable parts. The properties available include:

• window.location.href – the entire URL
• window.location.protocol – the protocol scheme (e.g., http: or https: )
• window.location.host – the hostname and port number
• window.location.hostname – the domain name of the URL
• window.location.port – the port number if specified
• window.location.pathname – the path or file name after the domain name
• window.location.search – the query portion of the URL, beginning with a ?
• window.location.hash – the fragment identifier, including the #
• window.location.origin – the base URL (protocol plus hostname and port)

Each of these properties can be read and, in some cases, set to update the current URL without reloading the page.

Browser Compatibility and Potential Issues

When working with window.location , it’s crucial to keep in mind browser compatibility. While the object and its methods are widely supported, peculiarities in behavior across different browsers can occur. It is good practice to consult documentation and test across various platforms to ensure consistent functionality.

Conclusion and Call to Action

Understanding and effectively utilizing window.location can significantly enhance the way you interact with URLs in your web applications. By taking advantage of its properties and methods, you can direct users to different pages, refresh content, and dissect URLs to improve user experiences and meet your app’s navigational needs.

Ready to start experimenting with window.location ? Open up your code editor and try implementing some of the methods discussed in this article. Test out redirecting to a new page, parsing the current URL, or simply refreshing the page programmatically. As you become more familiar with window.location , you’ll find it an indispensable tool in your JavaScript toolbox.

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Understanding the window.location Object

Using window.location in practice.

JavaScript is an essential programming language for web development, and one of its most powerful features is the ability to manipulate the browser’s window object. In this blog post, we’ll dive into the window.location object and examine how it can be used to navigate, manipulate, and gather information about the browser’s current URL. By the end of this post, you’ll have a complete understanding of the window.location object and its methods, properties, and use cases.

The window.location object is a part of the window object and provides information about the current document’s URL. It also allows you to manipulate and navigate the browser’s history. The window.location object has several properties and methods that can be used to access and modify the current URL.

Properties of window.location

Let’s take a look at the properties of the window.location object and what information they provide:

• window.location.href : The full URL of the current document, including the protocol, domain, port, path, and query string. For example, if the current URL is https://codedamn.com/blog/javascript-window-location , the value of window.location.href would be the same.
• window.location.protocol : The protocol used by the current URL, such as http: or https: .
• window.location.host : The full domain and port of the current URL, such as codedamn.com:80 (where 80 is the default port number for HTTP).
• window.location.hostname : The domain name of the current URL, such as codedamn.com .
• window.location.port : The port number used by the current URL. If no port number is specified, this property will be an empty string.
• window.location.pathname : The path of the current URL, such as /blog/javascript-window-location .
• window.location.search : The query string of the current URL, including the leading question mark (?), such as ?id=123&name=John .
• window.location.hash : The URL fragment identifier, including the leading hash symbol (#), such as #section-1 .

Methods of window.location

The window.location object also provides several methods to manipulate and navigate the browser’s history:

• window.location.assign(url) : Loads a new document at the specified URL.
• window.location.replace(url) : Replaces the current document with a new one at the specified URL without adding an entry to the browser’s history.
• window.location.reload(forcedReload) : Reloads the current document. If the forcedReload parameter is set to true , the browser will bypass the cache and request the document from the server.

Now that we’ve explored the properties and methods of the window.location object, let’s see how they can be used in practice.

Navigating to a New Page

To navigate to a new page, you can use the window.location.assign() method or simply set the window.location.href property to the desired URL. For example:

// Using window.location.href window . location . href = 'https://codedamn.com/learn/javascript' ;

Both of these methods have the same effect: they load the specified URL in the current browser window.

Reloading the Current Page

To reload the current page, you can use the window.location.reload() method:

// Force a reload, bypassing the browser cache window . location . reload ( true ) ;

Replacing the Current Page

If you want to navigate to a new page without adding an entry to the browser’s history, you can use the window.location.replace() method:

This method is useful when you want to prevent users from using the back button to return to the previous page.

Working with Query Strings

To access and manipulate the query string of the current URL, you can use the window.location.search property. For example, you can retrieve the query string and parse its key-value pairs:

// Parse the query string into an object const queryParams = new URLSearchParams ( queryString ) ;

// Access the values of the query parameters const id = queryParams . get ( 'id' ) ; // '123' const name = queryParams . get ( 'name' ) ; // 'John'

Q: Can I use window.location to navigate to a different domain?

A: Yes, you can use window.location.assign() or set window.location.href to a URL from a different domain. However, due to the same-origin policy, you won’t be able to access or manipulate the content of the other domain’s pages.

Q: How can I get only the domain and protocol of the current URL?

A: You can concatenate the window.location.protocol and window.location.hostname properties to get the full domain and protocol of the current URL, like this:

Q: How can I change only the hash part of the current URL?

A: You can set the window.location.hash property to the desired value:

This will update the URL’s hash without reloading the page.

Q: What is the difference between window.location.assign() and window.location.replace()?

A: The window.location.assign() method loads a new URL and adds it to the browser’s history, allowing the user to navigate back to the previous page using the back button. The window.location.replace() method loads a new URL and replaces the current page in the browser’s history, preventing the user from navigating back to the previous page.

We hope this guide has provided you with a comprehensive understanding of the JavaScript window.location object and its various properties and methods. As you continue to develop your JavaScript skills and work on web projects, you’ll find that window.location is an essential tool for managing and navigating browser URLs.

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JavaScript Window Location

In this tutorial you will learn about the JavaScript window location object.

The Location Object

The location property of a window (i.e. window.location ) is a reference to a Location object; it represents the current URL of the document being displayed in that window.

Since window object is at the top of the scope chain, so properties of the window.location object can be accessed without window. prefix, for example window.location.href can be written as location.href . The following section will show you how to get the URL of page as well as hostname, protocol, etc. using the location object property of the window object.

Getting the Current Page URL

You can use the window.location.href property to get the entire URL of the current page.

The following example will display the complete URL of the page on button click:

Getting Different Part of a URL

Similarly, you can use other properties of the location object such as protocol , hostname , port , pathname , search , etc. to obtain different part of the URL.

Try out the following example to see how to use the location property of a window.

Note: When you visit a website, you're always connecting to a specific port (e.g. http://localhost:3000). However, most browsers will simply not display the default port numbers, for example, 80 for HTTP and 443 for HTTPS.

Loading New Documents

You can use the assign() method of the location object i.e. window.location.assign() to load another resource from a URL provided as parameter, for example:

You can also use the replace() method to load new document which is almost the same as assign() . The difference is that it doesn't create an entry in the browser's history, meaning the user won't be able to use the back button to navigate to it. Here's an example:

Alternatively, you can use the window.location.href property to load new document in the window. It produce the same effect as using assign() method. Here's is an example:

Reloading the Page Dynamically

The reload() method can be used to reload the current page dynamically.

You can optionally specify a Boolean parameter true or false . If the parameter is true , the method will force the browser to reload the page from the server. If it is false or not specified, the browser may reload the page from its cache. Here's an example:

Note: The result of calling reload() method is different from clicking browser's Reload/Refresh button. The reload() method clears form control values that otherwise might be retained after clicking the Reload/Refresh button in some browsers.

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window.location.assign

Navigate to a new page.

Method of apis/location apis/location

The new URL to navigate to.

Return Value

Returns an object of type

Navigate to example.org.

The assign method is synonymous with replacing the window.location object with a string.

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Difference between window.location.href, window.location.replace and window.location.assign in JavaScript

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Window.location is a property that returns a Location object with information about the document’s current location. This Location object represents the location (URL) of the object it is linked to i.e. holds all the information about the current document location (host, href, port, protocol, etc.)

All three commands are used to redirect the page to another page/website but differ in terms of their impact on the browser history.

window.location.href Property :

• The href property on the location object stores the URL of the current webpage.
• On changing the href property, a user can navigate to a new URL, i.e. go to a new webpage.
• It adds an item to the history list (so that when the user clicks the “Back” button, he/she can return to the current page).
• Updating the href property is considered to be faster than using the assign() function (as calling a function is slower than accessing the property).

  Example: This example shows the use of the window.location.href property.

Note: The following 2 lines of code perform the same purpose.

window.location.replace Property :

• The replace function is used to navigate to a new URL without adding a new record to the history.
• As the name suggests, this function “replaces” the topmost entry from the history stack, i.e.,  removes the topmost entry from the history list, by overwriting it with a new entry.
• So, when the user clicks the “Back” button, he/she will not be able to return to the current page.
• Hence, the major difference between the assign() and replace() methods is that the replace() function will delete the current page from the session history.
• The replace function does not wipe out the entire page history, nor does it make the “Back” button non-functional.

  Example: This example shows the use of the window.location.replace property.

window.location.assign Property :

• The assign function is similar to the href property as it is also used to navigate to a new URL.
• The assign method, however, does not show the current location, it is only used to go to a new location.
• Unlike the replace method, the assign method adds a new record to history (so that when the user clicks the “Back” button, he/she can return to the current page).
• However, rather than updating the href property, calling a function is considered safer and more readable.
• The assign() method is also preferred over href as it allows the user to mock the function and check the URL input parameters while testing.

Example: This example shows the use of the window.location.assign property.

Difference between window.location.replace, window.location.assign and window.location.href properties:

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JS Reference

Html events, html objects, other references, window location, the window location object.

The location object contains information about the current URL.

The location object is a property of the window object .

The location object is accessed with:

window.location or just location

Location Object Properties

Location object methods.

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