From the course: Mastering Web Developer Interview Code
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What are event bubbling and propagation about?
From the course: Mastering Web Developer Interview Code
What are event bubbling and propagation about?
- [Instructor] Events are a huge part of what makes it possible to have dynamic pages. So knowing how to work with them and understanding how they work is pretty important. Now let's take a look at a real popular interview question that tests your understanding of events and that is about event propagation and how it works. The modern way to create events are by adding an event listener to an item in your DOM and you need to pass three different parameters. The first is the type of event that you want to track. So for example here would go a click or something else. The second is the callback or function that you want to execute when that event takes place and finally the type of propagation and the type of propagation is a boolean so you specify a true or a false value there. Now that determines the order in which the event is tracked through the DOM. We'll take a look at an example in just a minute but most of the time this…
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How do you use the data- attribute in HTML?11m 14s
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Are you comfortable using jQuery?11m 32s
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Describe when you should use the bind() method5m 21s
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Do you know how to use the conditional operator?3m 43s
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Have you used Ajax to load an external file?8m 25s
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Have you used JavaScript templates?7m 3s
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How do you manipulate the DOM?11m 7s
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How do you search using functional programming?6m 27s
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How do you use a constructor to create instances?10m 33s
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How do you use arrow functions in ES6?6m 30s
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How do you use the Fetch API?7m 22s
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How do you render JSON to a DOM element?9m 36s
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How does an IIFE work?7m 12s
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How does immutability work in JavaScript?4m 12s
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How would you use JavaScript reduce()?3m 54s
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Quick concepts: Do you have experience linting your code?2m 31s
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What are event bubbling and propagation about?11m 42s
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What does "use strict" do?3m 28s
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What is a callback and how do you use it?8m 51s
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What is the relationship between promises and callbacks?9m 57s
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What is the virtual DOM?7m 7s
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What is variable hoisting and how do you guard against it?8m 43s
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What tooling options have you used in the past?7m 11s
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When would you use recursion?6m 25s
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Can you build a Sass mixin?7m 57s
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Do you know how to use CSS variables?10m 38s
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Animate an underline on hover in CSS9m 48s
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Explain the difference between absolute and relative positioning7m 55s
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How comfortable are you with Sass?12m 10s
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How do you animate CSS?9m 41s
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How do you debug CSS using your browser?10m 47s
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How do you use calc() in CSS?9m 56s
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How would you use flexbox to control horizontal alignment?7m 21s
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In CSS, what's the difference between ems and rems?9m 58s
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What's the difference between a pseudo-class and a pseudo-element?6m 16s
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Do you know how to use npm?8m 40s
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Do you have experience using version control?16m 37s
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How does routing work in a modern web application?9m 30s
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