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Please enable JavaScript in your browser settings or update your browser.Lära Challenge: Implement Event Listeners | Event Handling and User Interactions in JavaScript
Advanced JavaScript Mastery
course content

Kursinnehåll

Advanced JavaScript Mastery

Advanced JavaScript Mastery

1. Mastering JavaScript Classes and Inheritance
Getting StartedUnderstanding Class Declarations in JavaScriptChallenge: Create a JavaScript ClassDefining Methods in JavaScript ClassesChallenge: Add Methods to a ClassUsing Parameter ObjectsWorking with Private Properties in ClassesChallenge: Implement Private Properties in a ClassManaging Properties with Getters and SettersChallenge: Implement Getters and Setters in a ClassExploring Static Properties in JavaScriptUsing Static Methods in JavaScriptChallenge: Implement Static Properties and Methods in a ClassUnderstanding 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 DOMChallenge: Query and Select DOM ElementsUnderstanding the DOM Hierarchy and RelationshipsChallenge: Navigate the DOM HierarchyExploring DOM Properties in JavaScriptWorking with Element Attributes in the DOMChallenge: Manage Element Properties and AttributesAdding Elements to the DOM DynamicallyRemoving Elements From the DOMChallenge: Add and Remove DOM ElementsModifying Element Styles with JavaScriptChallenge: Apply Dynamic Styles to DOM Elements
3. Event Handling and User Interactions in JavaScript
Introduction to Events and Event ListenersUnderstanding the Event Object in JavaScriptChallenge: Implement Event ListenersEvent Propagation and Delegation ExplainedChallenge: Handle Event Propagation and DelegationWorking with Keyboard and Mouse EventsManaging and Removing Event Listeners
4. Asynchronous JavaScript and API Integration
Introduction to Asynchronous JavaScriptUnderstanding Callbacks in JavaScriptHandling Asynchronous Operations with PromisesUsing Async/Await for Cleaner Asynchronous CodeFetching and Working with APIs in JavaScriptIntegrating APIs in JavaScript ApplicationsChallenge: Fetch and Use API DataIntegrating Third-Party Libraries in JavaScriptChallenge: Work with Third-Party LibrariesHandling Multiple Asynchronous Requests

book
Challenge: Implement Event Listeners

Task

You're building a form where users can submit their details. Your goal is to validate user input, provide real-time feedback as they type, and prevent form submission if the input is invalid.

  1. Real-Time Input Feedback:
    • Listen for changes as the user types;
    • Inside the event handler, check the length of the input value;
    • If it's less than 3 characters, set the content of the <p> with ID feedback to "Name is too short.";
    • If it's 3 characters or more, set feedback to "Name looks good!".
  2. Prevent Default Form Submission:
    • Listen for form submissions;
    • Stop the form from the default submitting behavior;
    • Check the input value;
    • If it's less than 3 characters, display "Please enter a longer name" in the <p> with ID form-message;
    • If it's 3 characters or more, display "Form submitted successfully!" in form-message.
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  • Use the input event to listen for changes as the user types;
  • Use event.target.value.length < 3 to check the length of the input value;
  • Use the submit event to listen for form submissions;
  • Use event.preventDefault() to stop the form from the default submitting behavior;
  • Use nameInput.value.length < 3 to check the input value.
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Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 3

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course content

Kursinnehåll

Advanced JavaScript Mastery

Advanced JavaScript Mastery

1. Mastering JavaScript Classes and Inheritance
Getting StartedUnderstanding Class Declarations in JavaScriptChallenge: Create a JavaScript ClassDefining Methods in JavaScript ClassesChallenge: Add Methods to a ClassUsing Parameter ObjectsWorking with Private Properties in ClassesChallenge: Implement Private Properties in a ClassManaging Properties with Getters and SettersChallenge: Implement Getters and Setters in a ClassExploring Static Properties in JavaScriptUsing Static Methods in JavaScriptChallenge: Implement Static Properties and Methods in a ClassUnderstanding 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 DOMChallenge: Query and Select DOM ElementsUnderstanding the DOM Hierarchy and RelationshipsChallenge: Navigate the DOM HierarchyExploring DOM Properties in JavaScriptWorking with Element Attributes in the DOMChallenge: Manage Element Properties and AttributesAdding Elements to the DOM DynamicallyRemoving Elements From the DOMChallenge: Add and Remove DOM ElementsModifying Element Styles with JavaScriptChallenge: Apply Dynamic Styles to DOM Elements
3. Event Handling and User Interactions in JavaScript
Introduction to Events and Event ListenersUnderstanding the Event Object in JavaScriptChallenge: Implement Event ListenersEvent Propagation and Delegation ExplainedChallenge: Handle Event Propagation and DelegationWorking with Keyboard and Mouse EventsManaging and Removing Event Listeners
4. Asynchronous JavaScript and API Integration
Introduction to Asynchronous JavaScriptUnderstanding Callbacks in JavaScriptHandling Asynchronous Operations with PromisesUsing Async/Await for Cleaner Asynchronous CodeFetching and Working with APIs in JavaScriptIntegrating APIs in JavaScript ApplicationsChallenge: Fetch and Use API DataIntegrating Third-Party Libraries in JavaScriptChallenge: Work with Third-Party LibrariesHandling Multiple Asynchronous Requests

book
Challenge: Implement Event Listeners

Task

You're building a form where users can submit their details. Your goal is to validate user input, provide real-time feedback as they type, and prevent form submission if the input is invalid.

  1. Real-Time Input Feedback:
    • Listen for changes as the user types;
    • Inside the event handler, check the length of the input value;
    • If it's less than 3 characters, set the content of the <p> with ID feedback to "Name is too short.";
    • If it's 3 characters or more, set feedback to "Name looks good!".
  2. Prevent Default Form Submission:
    • Listen for form submissions;
    • Stop the form from the default submitting behavior;
    • Check the input value;
    • If it's less than 3 characters, display "Please enter a longer name" in the <p> with ID form-message;
    • If it's 3 characters or more, display "Form submitted successfully!" in form-message.
index.html

index.html

index.css

index.css

index.js

index.js

copy
  • Use the input event to listen for changes as the user types;
  • Use event.target.value.length < 3 to check the length of the input value;
  • Use the submit event to listen for form submissions;
  • Use event.preventDefault() to stop the form from the default submitting behavior;
  • Use nameInput.value.length < 3 to check the input value.
index.html

index.html

index.css

index.css

index.js

index.js

copy

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 3
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