JavaScript: Return true if the parent element contains the child element, false otherwise

JavaScript fundamental (ES6 Syntax): Exercise-240 with Solution

Check Parent Contains Child

Write a JavaScript program that returns true if the parent element contains the child element, false otherwise.

Note: Check that parent is not the same element as child, use parent.contains(child) to check if the parent element contains the child element.

• Check that parent is not the same element as child.
• Use Node.contains() to check if the parent element contains the child element.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
// Define a function 'elementContains' to check if a parent element contains a child element
const elementContains = (parent, child) => 
  // Check if the parent element is not the same as the child element and if the parent contains the child
  parent !== child && parent.contains(child);

// Test the 'elementContains' function with different parent-child element combinations
console.log(elementContains(document.querySelector('head'), document.querySelector('title'))); // Output: true
console.log(elementContains(document.querySelector('body'), document.querySelector('body'))); // Output: false

Output:

true
false

Flowchart:

Live Demo:

See the Pen javascript-fundamental-exercise-240 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that returns true if a specified DOM element is contained within another element.
• Write a JavaScript function that uses Node.contains() to check for parent-child relationships in the DOM.
• Write a JavaScript program that traverses up the DOM tree to determine if an element is a descendant of a given parent.
• Write a JavaScript function that tests two DOM nodes and returns whether the first contains the second.

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