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What is Mojo::DOM prepend?

Gutha Vamsi Krishna

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

The prepend method is used to prepend the HTML/XML fragment to the given element. This method is provided by the Mojo::DOM module, which is an HTML/XML DOM parser with CSS selectors.

Syntax

$dom->prepend('HTML/XML fragment')

Returns

This method will return the Mojo::DOM object after prepending the given HTML/XML fragment.

Let’s take a look at an example.

Example

The given HTML is as follows:

<div>
   Inside div
   <p id="b">Inside second paragraph</p>
</div>

When we prepend the HTML fragment <p id="a">Inside first paragraph </p> to the element p using the prepend method, we will get the following output.

<div>
   Inside div 
   <p id="a">Inside first paragraph </p>
   <p id="b">Inside second paragraph</p>
</div>

Code

use 5.010;
use Mojo::DOM;

# Parse the html
say "Before:";
say my $dom = Mojo::DOM->new('<div>Inside div <p id="b">Inside second paragraph</p></div>');

# Prepend the HTML fragment
say "After prepend method:";
say $dom->at('p')->prepend('<p id="a">Inside first paragraph </p>')->root
Example of Mojo::DOM prepend

Explanation

In the code snippet above:

  • In Line 2: We are importing the Mojo::DOM module.
  • In Line 6: We parse the HTML, store it in scalar $dom, and display it.
  • In Line 10: We will prepend the given HTML fragment to the element p and get the root element and display it.

RELATED TAGS

mojo
perl
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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