Javascript window replace function

Window location.replace()

The replace() method replaces the current document with a new one.

See Also:

Note

The difference between assign() and replace():

replace() removes the current URL from the document history.

With replace() it is not possible to use «back» to navigate back to the original document.

Syntax

Parameters

Return Value

Browser Support

location.replace() is supported in all browsers:

Chrome Edge Firefox Safari Opera IE
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Web Development

Web development refers to the creating, building, and maintaining of websites. It includes aspects such as web design, web publishing, web programming, and database management. It is the creation of an application that works over the internet i.e. websites.

Web Development

The word Web Development is made up of two words, that is:

  • Web: It refers to websites, web pages or anything that works over the internet.
  • Development: It refers to building the application from scratch.

Web Development can be classified into two ways:

Frontend Development

The part of a website where the user interacts directly is termed as front end. It is also referred to as the ‘client side’ of the application.

Frontend Roadmap

Frontend Development Roadmap

Frontend Development Roadmap

  • HTML: HTML stands for HyperText Markup Language. It is used to design the front end portion of web pages using markup language. It acts as a skeleton for a website since it is used to make the structure of a website.
  • CSS: Cascading Style Sheets fondly referred to as CSS is a simply designed language intended to simplify the process of making web pages presentable. It is used to style our website.
  • JavaScript: JavaScript is a scripting language used to provide a dynamic behavior to our website.
  • Bootstrap: Bootstrap is a free and open-source tool collection for creating responsive websites and web applications. It is the most popular CSS framework for developing responsive, mobile-first websites. Nowadays, the websites are perfect for all browsers (IE, Firefox, and Chrome) and for all sizes of screens (Desktop, Tablets, Phablets, and Phones).
    • Bootstrap 4
    • Bootstrap 5

    Frontend Libraries and Frameworks

    Backend Development

    Backend is the server side of a website. It is part of the website that users cannot see and interact with. It is the portion of software that does not come in direct contact with the users. It is used to store and arrange data.

    Backend Roadmap

    Backend Development Roadmap

    Backend Development Roadmap

    • PHP: PHP is a server-side scripting language designed specifically for web development.
    • Java: Java is one of the most popular and widely used programming languages. It is highly scalable.
    • Python: Python is a programming language that lets you work quickly and integrate systems more efficiently.
    • Node.js: Node.js is an open source and cross-platform runtime environment for executing JavaScript code outside a browser.

    Back End Frameworks and Technology:

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    Replace Function in JavaScript

    Replace Function in JavaScript

    JavaScript provides us with many inbuilt functions, which also include replace functions. Replace function in JavaScript is used to replace strings. It replaces a given string or some part of the string. But in this function, also original string will not change. Replace() method search for a specified value in the string or a regular expression and replace the string without modifying the original string because it always returns the new string.

    Web development, programming languages, Software testing & others

    Syntax

    This replace method takes two parameters; let’s discuss them in detail:

    • It has two parameters as, A and B.
    • A parameter is a regular expression, and another parameter which is B, will be a string that is responsible for replacing the content from the given string.
    var newString = str.replace(reg-expression|str, newSubstr|functionTocall)

    Here we will discuss the below syntax in detail.

    • function (replacement): This is used to call a function responsible for creating a new substring which in turn is used to replace the content matched in the original string.
    • newSubStr (replacement): This is used to replace the substring’s content specified by the regular expression or string value itself.
    • regexp (pattern): This is used to replace; basically, it matches the pattern with the string and replaces it with a new substring.
    • substr (pattern): This would be the string that will be replaced by new content. In this, only the first occurrence will be replaced.
    • Return value: This method returns the new string object without modifying the original string. So it will provide us with the changed string with replaced content.

    We can also say this variable is a search value and a new value. Both these parameters are required; they are not optional. It uses JavaScript Version, i.e., ECMAScript 1.

    To show basic usage of replace() function.

       

    Prerss the bnutton to replace content "abc" with "black" in the content below

    This abc will be reaplce by balck from abc black.

    replace function in javascript 1

    replace function in javascript 2

    How does Replace Function Work in JavaScript?

    Replace() function replaces the string as the name suggests; it replaces the whole or some string depending upon the input or pattern we pass. This pattern can be like a regular expression or a string value. But in this, we have to note one thing, i.e., if the pattern we are passing is a string value, then only the first occurrence of the string will be replaced. To replace all occurrences, we must pass a regular expression to find and replace all instances.

    But in all this, our original string will still be unchanged. So basically, it does not change the string object on which it is called. It will just return the new string. If we want to perform a global replace and search, we need to include the g switch while using the regular expression.

    The replacement string contains some special character patterns:

    • $$: It will inserts “$”.
    • $&: It will insert the matched substring.
    • $’: It will insert the string portion that will match the following sun string.
    • $`: This will insert the string preceding the matching substring.
    • $n: Here, n is the positive integer less than 100; it will insert the nth match string. Note this is l-indexed.

    While using replace() method, we can also mention this function parameter as the second parameter, but in this case, this function will be invoked only after the match with the corresponding string has been performed.

    We have the following argument for function as follows:

    • string: This whole string is going to examine.
    • match: This is the matched substring corresponding to the pattern above, i.e., $&
    • offset: In this, we will examine the offset, so the matched string offset with the original substring will examine.

    Examples of Replace Function in JavaScript

    Below are examples of Replace Function in JavaScript:

    Example #1

    Using regular expression inside replace() function.

       

    Press button to see use of replace function

    Some text will be replaced on click.

    example 1

    replace function in javascript

    Example #2

       

    Press button to see use of replace function

    Black will be replace by another word.

    example 2

    replace function in javascript 6

    Example #3

    To show switching of words by using regular expression

       

    Press button to see use of replace function

    Words will be reverse in this example.(first two)

    example 3

    replace function in javascript 8

    Example #4

    We are calling functions to perform changes and converting a string to uppercase.

       

    By clicking the button below word will be in upper case

    Here we are chnaging some words to uppercase by clicking the button.

    replace function in javascript 9JPG

    replace function in javascript 10JPG

    Conclusion

    The JavaScript replace() function replaces the string or substring, bypassing the string as a value or regular expression. We can also call functions from inside to perform more changes on the string, like uppercase, lowercase, etc. The main advantage of using this replace function is that it never changes our original string. It will always return us a new string.

    This is a guide to Replace Function in JavaScript. Here we discuss how replace function works in JavaScript? and examples. You may also have a look at the following articles to learn more –

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