Kurssisisältö

Advanced JavaScript Mastery

1. Mastering JavaScript Classes and Inheritance

Getting Started Understanding Class Declarations in JavaScript Challenge: Create a JavaScript Class Defining Methods in JavaScript Classes Challenge: Add Methods to a Class Using Parameter Objects Working with Private Properties in Classes Challenge: Implement Private Properties in a Class Managing Properties with Getters and Setters Challenge: Implement Getters and Setters in a Class Exploring Static Properties in JavaScript Using Static Methods in JavaScript Challenge: Implement Static Properties and Methods in a Class Understanding Inheritance with extends and super()Challenge: Implement Class Inheritance with extends and super()

2. DOM Manipulation for Interactive Web Development

What Is the Document Object Model (DOM)?Querying and Selecting Elements in the DOM Challenge: Query and Select DOM Elements Understanding the DOM Hierarchy and Relationships Challenge: Navigate the DOM Hierarchy Exploring DOM Properties in JavaScript Working with Element Attributes in the DOM Challenge: Manage Element Properties and Attributes Adding Elements to the DOM Dynamically Removing Elements From the DOM Challenge: Add and Remove DOM Elements Modifying Element Styles with JavaScript Challenge: Apply Dynamic Styles to DOM Elements

3. Event Handling and User Interactions in JavaScript

Introduction to Events and Event Listeners Understanding the Event Object in JavaScript Challenge: Implement Event Listeners Event Propagation and Delegation Explained Challenge: Handle Event Propagation and Delegation Working with Keyboard and Mouse Events Managing and Removing Event Listeners

4. Asynchronous JavaScript and API Integration

Introduction to Asynchronous JavaScript Understanding Callbacks in JavaScript Handling Asynchronous Operations with Promises Using Async/Await for Cleaner Asynchronous Code Fetching and Working with APIs in JavaScript Integrating APIs in JavaScript Applications Challenge: Fetch and Use API Data Integrating Third-Party Libraries in JavaScript Challenge: Work with Third-Party Libraries Handling Multiple Asynchronous Requests

Working with Element Attributes in the DOM

Attributes are values added to HTML elements to provide additional information or modify their behavior. JavaScript provides several methods to work with these attributes, allowing you to dynamically get, set, remove, or check for specific attributes.

GetAttribute()

getAttribute() is used to retrieve the value of a specified attribute from an element. It's useful when you need to access specific attribute values like href, src, class, etc.

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Accesses the value of the href attribute of the anchor (<a>) element.

SetAttribute()

setAttribute() is used to add a new attribute or change the value of an existing attribute on an element.

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Sets or updates the alt attribute of the image, allowing for dynamic changes based on user actions or application logic.

RemoveAttribute()

removeAttribute() removes a specified attribute from an element, making it useful for conditionally toggling attributes based on certain events or states.

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Removes the disabled attribute, enabling the button for interaction.

HasAttribute()

hasAttribute() checks whether an element has a specified attribute. This method is particularly useful for conditional logic, ensuring that certain attributes exist before performing further actions.

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Checks if the required attribute exists on the input field and logs a message accordingly.

Differences Between Properties and Attributes

While properties and attributes are often used interchangeably, they serve different roles in the DOM. Let's inspect their differences.

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The value attribute retains the original value defined in the HTML;
The value property reflects the current, dynamically updated state of the input.

Practical Example: Managing Product Details on an E-commerce Site

Imagine you have a product details section where users can update product information such as availability, featured status, and shipping options. This example demonstrates how attributes are used to dynamically control these aspects.

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The setAttribute() method is used to dynamically add specific attributes to elements based on user actions. For instance, when the availability status is toggled to "Out of Stock," setAttribute() adds an out-of-stock class to apply unique styling. Similarly, it adds a data-featured attribute to the featured checkbox when the product is marked as featured.

The removeAttribute() method removes these attributes when they are no longer needed. For example, it removes the out-of-stock class when toggling back to "In Stock" and removes the data-featured attribute if the product is no longer marked as featured. Additionally, it uses removeAttribute() to toggle the visibility of the shipping information by adding or removing the hidden attribute.

Lastly, hasAttribute() checks for the presence of these attributes, such as verifying if the data-featured attribute exists before updating the featured status or checking the hidden attribute on shipping info to determine its visibility state.

1. Which method is used to retrieve the value of an attribute from an element?

2. What does the `setAttribute()` method do?

3. What will the following code output?

Which method is used to retrieve the value of an attribute from an element?

Select the correct answer

getAttribute()

setAttribute()

removeAttribute()

hasAttribute()

What does the setAttribute() method do?

Select the correct answer

Adds a new attribute or updates an existing attribute's value.

Removes an attribute from an element.

Checks if an attribute exists on an element.

Retrieves the value of an attribute.

What will the following code output?

Select the correct answer

true

false

null

An error

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Osio 2. Luku 7

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Kurssisisältö

Advanced JavaScript Mastery

1. Mastering JavaScript Classes and Inheritance

2. DOM Manipulation for Interactive Web Development

3. Event Handling and User Interactions in JavaScript

4. Asynchronous JavaScript and API Integration

Working with Element Attributes in the DOM

GetAttribute()

getAttribute() is used to retrieve the value of a specified attribute from an element. It's useful when you need to access specific attribute values like href, src, class, etc.

index.html

index.js

Accesses the value of the href attribute of the anchor (<a>) element.

SetAttribute()

setAttribute() is used to add a new attribute or change the value of an existing attribute on an element.

index.html

index.js

Sets or updates the alt attribute of the image, allowing for dynamic changes based on user actions or application logic.

RemoveAttribute()

removeAttribute() removes a specified attribute from an element, making it useful for conditionally toggling attributes based on certain events or states.

index.html

index.js

Removes the disabled attribute, enabling the button for interaction.

HasAttribute()

index.html

index.js

Checks if the required attribute exists on the input field and logs a message accordingly.

Differences Between Properties and Attributes

While properties and attributes are often used interchangeably, they serve different roles in the DOM. Let's inspect their differences.

index.html

index.js

The value attribute retains the original value defined in the HTML;
The value property reflects the current, dynamically updated state of the input.

Practical Example: Managing Product Details on an E-commerce Site

index.html

index.css

index.js

1. Which method is used to retrieve the value of an attribute from an element?

2. What does the `setAttribute()` method do?

3. What will the following code output?

Which method is used to retrieve the value of an attribute from an element?

Select the correct answer

getAttribute()

setAttribute()

removeAttribute()

hasAttribute()

What does the setAttribute() method do?

Select the correct answer

Adds a new attribute or updates an existing attribute's value.

Removes an attribute from an element.

Checks if an attribute exists on an element.

Retrieves the value of an attribute.

What will the following code output?

Select the correct answer

true

false

null

An error

Oliko kaikki selvää?

Miten voimme parantaa sitä?

Kiitos palautteestasi!

Osio 2. Luku 7

Advanced JavaScript Mastery

Working with Element Attributes in the DOM

GetAttribute()

SetAttribute()

RemoveAttribute()

HasAttribute()

Differences Between Properties and Attributes

Practical Example: Managing Product Details on an E-commerce Site

1. Which method is used to retrieve the value of an attribute from an element?

2. What does the setAttribute() method do?

3. What will the following code output?

Advanced JavaScript Mastery

Working with Element Attributes in the DOM

GetAttribute()

SetAttribute()

RemoveAttribute()

HasAttribute()

Differences Between Properties and Attributes

Practical Example: Managing Product Details on an E-commerce Site

1. Which method is used to retrieve the value of an attribute from an element?

2. What does the setAttribute() method do?

3. What will the following code output?

2. What does the `setAttribute()` method do?

2. What does the `setAttribute()` method do?