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This is a easy difficulty Other / Miscellaneous question, commonly asked during Technical Screen rounds at The Trade Desk.

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This question is commonly asked for Software Engineer candidates at The Trade Desk during technical interviews.

Add a click listener to a button

Last updated: Mar 29, 2026

Quick Overview

This question evaluates understanding of DOM event handling and the event object in JavaScript, including use of document.querySelector, addEventListener, and the meaning of e.target.

The Trade Desk

Jul 26, 2025, 12:00 AM

Software Engineer

Technical Screen

Other / Miscellaneous

JavaScript: Add a Click Listener to Log Button Text

Context

Assume your page contains a button element like:

<button id="my-button">Click me</button>

Task

Use document.querySelector and addEventListener to add a click handler to the button with id "my-button".
When the button is clicked, log the button's text content to the console.
Briefly explain what e.target refers to in the click handler.

Solution

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