Week 9_Lesson 2
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Questions and Answers

What does the window.location.href property return?

  • The URL of the current page (correct)
  • The address of the user's internet connection
  • The path for the browser's cache
  • The previous URL visited by the user

    • Which of the following statements is true regarding the window.history object?

  • It can be accessed freely without restrictions.
  • It allows modification of the browser's history list.
  • JavaScript access to this object is limited for user privacy. (correct)
  • It contains information about the user's screen dimensions.

    • Which method would you use to open a dialog box that prompts the user for input in JavaScript?

  • window.prompt() (correct)
  • window.confirm()
  • window.dialog()
  • window.alert()

    • Which of the following represents the inner width of the browser window in pixels?

    <p>window.innerWidth</p> Signup and view all the answers

    How can information about the user's screen be accessed in JavaScript?

    <p>Using window.screen object</p> Signup and view all the answers

    Which property of the window.history object would allow navigation to the previous page in browser history?

    <p>history.go(-1)</p> Signup and view all the answers

    What is the function of the window object in JavaScript?

    <p>It allows global variables to be defined as its properties.</p> Signup and view all the answers

    Which of the following statements about the window object is false?

    <p>The window object can only be accessed in Chrome.</p> Signup and view all the answers

    What property is commonly used to modify the content of an HTML element in JavaScript?

    <p>innerHTML</p> Signup and view all the answers

    Which of the following describes an event generated by the browser in the context of the HTML DOM?

    <p>User interactions</p> Signup and view all the answers

    Which JavaScript popup box only displays a message and an OK button?

    <p>Alert box</p> Signup and view all the answers

    What does the Document Object Model (DOM) allow JavaScript to change regarding HTML elements?

    <p>The style and content of elements</p> Signup and view all the answers

    Which of the following objects is universally supported by all web browsers for performing operations related to the browser interface?

    <p>Window object</p> Signup and view all the answers

    What value is returned when a user clicks 'Cancel' in a Confirm Box?

    <p>false</p> Signup and view all the answers

    Which type of popup box allows a user to input a value?

    <p>Prompt Box</p> Signup and view all the answers

    Which of the following operations is NOT possible with JavaScript on the Document Object Model (DOM)?

    <p>Executing external programs</p> Signup and view all the answers

    When an Alert Box appears, what must the user do to proceed?

    <p>Click 'OK'</p> Signup and view all the answers

    What effect does the window.confirm() method have if the user chooses 'OK'?

    <p>It will return true</p> Signup and view all the answers

    Which of the following statements is true about the document object in the context of HTML DOM?

    <p>It represents the web page itself.</p> Signup and view all the answers

    Which feature allows JavaScript to dynamically change HTML attributes?

    <p>Document Object Model (DOM)</p> Signup and view all the answers

    What happens when a user clicks 'OK' in a Prompt Box?

    <p>It returns the input value</p> Signup and view all the answers

    Which object allows JavaScript to interact with the browser environment?

    <p>Browser Object Model (BOM)</p> Signup and view all the answers

    Which property would you use to retrieve the overall height of the browser window?

    <p>window.innerHeight</p> Signup and view all the answers

    What limitation exists regarding the window.history object?

    <p>JavaScript access to it is restricted for user privacy.</p> Signup and view all the answers

    How can you reference the screen object without the window prefix?

    <p>screen</p> Signup and view all the answers

    Which property is used to obtain the current URL of the page?

    <p>window.location.href</p> Signup and view all the answers

    What does the term 'global variables are properties of the window object' imply?

    <p>They are properties of the global scope in the browser.</p> Signup and view all the answers

    Which of the following does NOT describe a method associated with the window object?

    <p>navigate()</p> Signup and view all the answers

    In what way can JavaScript modify window properties?

    <p>By accessing properties of the window object directly.</p> Signup and view all the answers

    To access the history object without typing the window prefix, which is the correct syntax?

    <p>history</p> Signup and view all the answers

    Which object provides methods to interact with the browser's previous pages?

    <p>window.history</p> Signup and view all the answers

    What is the primary purpose of an alert box in JavaScript?

    <p>To ensure information comes through to the user.</p> Signup and view all the answers

    Which of the following statements about a confirm box is accurate?

    <p>It can be called without the window prefix.</p> Signup and view all the answers

    What happens when a user clicks 'Cancel' in a prompt box?

    <p>The box returns null.</p> Signup and view all the answers

    How can JavaScript affect HTML elements in a webpage?

    <p>It can change any HTML element, attribute, or style on the page.</p> Signup and view all the answers

    Which of the following actions can be performed using the document object in the HTML DOM?

    <p>Access and manipulate any HTML element on a page.</p> Signup and view all the answers

    What does the confirm box return if the user clicks 'OK'?

    <p>True.</p> Signup and view all the answers

    Which of the following describes a characteristic of the prompt box?

    <p>It returns the input value if 'OK' is clicked.</p> Signup and view all the answers

    Which method can be used to initiate the confirmation process for the user?

    <p>window.confirm()</p> Signup and view all the answers

    What is NOT a function of JavaScript in relation to the Document Object Model (DOM)?

    <p>Altering browser's APIs.</p> Signup and view all the answers

    What is the role of the document object in accessing HTML elements?

    <p>It represents the entire HTML structure of the page.</p> Signup and view all the answers

    Which property is primarily used to change the content of an HTML element through JavaScript?

    <p>innerHTML</p> Signup and view all the answers

    What does the Document Object Model (DOM) primarily allow JavaScript to interact with?

    <p>HTML Elements</p> Signup and view all the answers

    Which of the following correctly describes the purpose of events in the HTML DOM?

    <p>Events initiate code execution when actions happen to HTML elements.</p> Signup and view all the answers

    In which situation would you typically use the alert box in JavaScript?

    <p>To show a message to the user without needing a response.</p> Signup and view all the answers

    Which method allows you to execute specific code when a user clicks a button in an HTML document?

    <p>window.addEventListener()</p> Signup and view all the answers

    What is one of the main limitations when directly changing HTML DOM properties?

    <p>Changes affect the entire document instead of specific elements.</p> Signup and view all the answers

    What are the three types of popup boxes supported by JavaScript?

    <p>Alert, Confirm, Prompt</p> Signup and view all the answers

    Which of the following statements about HTML DOM methods is FALSE?

    <p>DOM methods can only return values, not execute actions.</p> Signup and view all the answers

    When would you generally prefer using the prompt box over the confirm box?

    <p>When you need to capture user input.</p> Signup and view all the answers

    What kind of operations are HTML DOM properties primarily associated with?

    <p>Setting or changing values of HTML elements</p> Signup and view all the answers

    Which item is NOT part of the Browser Object Model (BOM)?

    <p>Document</p> Signup and view all the answers

    The window.screen object requires the 'window' prefix to be referenced in JavaScript.

    <p>False</p> Signup and view all the answers

    What JavaScript property would you use to get the inner height of the browser window?

    <p>window.innerHeight</p> Signup and view all the answers

    The object that contains the history of the user's navigation is called ____.

    <p>window.history</p> Signup and view all the answers

    Match the following BOM objects with their descriptions:

    <p>Window = Represents the browser's window Navigator = Provides information about the browser Location = Contains URL information History = Tracks the user's navigation history</p> Signup and view all the answers

    What property of the window.location object returns the current page URL?

    <p>window.location.href</p> Signup and view all the answers

    Global variables in JavaScript are properties of the window object.

    <p>True</p> Signup and view all the answers

    Name one limitation of the window.history object regarding its access in JavaScript.

    <p>Privacy limitations</p> Signup and view all the answers

    The ____ object in BOM allows JavaScript to interact with the browser's navigation history.

    <p>history</p> Signup and view all the answers

    Which of the following describes the window.innerWidth property?

    <p>The width of the browser window in pixels</p> Signup and view all the answers

    What does the confirm box return if the user clicks 'Cancel'?

    <p>False</p> Signup and view all the answers

    An alert box can return a value after the user clicks 'OK'.

    <p>False</p> Signup and view all the answers

    What is the primary purpose of the prompt box?

    <p>To get user input</p> Signup and view all the answers

    The document object represents the ____ webpage.

    <p>current</p> Signup and view all the answers

    Match the following JavaScript popup boxes with their functions:

    <p>Alert Box = Displays a message Confirm Box = Asks for user confirmation Prompt Box = Requests user input Null Return = Indicates cancellation of user input</p> Signup and view all the answers

    When the user clicks 'OK' in a prompt box, what is returned?

    <p>The input value</p> Signup and view all the answers

    JavaScript can remove existing HTML elements and attributes.

    <p>True</p> Signup and view all the answers

    What method can be used to initiate a confirmation dialog for the user?

    <p>window.confirm()</p> Signup and view all the answers

    An alert box requires the user to click '____' to proceed.

    <p>OK</p> Signup and view all the answers

    Which of the following describes a feature of the Document Object Model (DOM)?

    <p>Can change CSS styles</p> Signup and view all the answers

    What property is primarily used to change the content of an HTML element in JavaScript?

    <p>innerHTML</p> Signup and view all the answers

    JavaScript can only change HTML element styles but not their content.

    <p>False</p> Signup and view all the answers

    What action does the window.confirm() method perform?

    <p>It shows a dialog box with OK and Cancel options.</p> Signup and view all the answers

    To listen for events in the HTML DOM, JavaScript uses ______.

    <p>event listeners</p> Signup and view all the answers

    Match the following JavaScript popup boxes with their descriptions:

    <p>Alert box = Displays a message to the user Confirm box = Asks the user to confirm an action Prompt box = Allows user input Info box = Displays additional information</p> Signup and view all the answers

    Which of the following is NOT an action that can be performed on HTML elements via the HTML DOM?

    <p>Change programming language</p> Signup and view all the answers

    The HTML DOM allows JavaScript to change the structure of HTML elements.

    <p>True</p> Signup and view all the answers

    Name one JavaScript method that allows dynamic interaction with the user.

    <p>alert() or confirm() or prompt()</p> Signup and view all the answers

    The __________ object is supported by all browsers and allows interaction with the web page.

    <p>window</p> Signup and view all the answers

    What happens when a user clicks 'OK' in a Confirm Box?

    <p>A true value is returned.</p> Signup and view all the answers

    Study Notes

    The Browser Object Model (BOM)

    • The BOM allows JavaScript to interact with the browser.
    • It includes objects like Window, Navigator, Location, History, and Screen.

    The Window Object

    • Represents the browser's window.
    • Global variables are properties of the window object.
    • Global functions are methods of the window object.
    • The document object (HTML DOM) is a property of the window object.
    • window.innerHeight returns the inner height of the browser window in pixels.
    • window.innerWidth returns the inner width of the browser window in pixels.

    The Window Screen

    • The window.screen object provides information about the user's screen.
    • It can be accessed directly without the window prefix.

    The Window Location

    • The window.location object allows access to the current page's URL.
    • It can be accessed directly without the window prefix.
    • window.location.href property returns the URL of the current page.

    The Window History

    • The window.history object contains the browser's history.
    • It can be accessed directly without the window prefix.
    • JavaScript has limited access to this object to protect user privacy.

    Window Popup Boxes

    • JavaScript offers three types of popup boxes: Alert, Confirm, and Prompt.

    Alert Box

    • Displays a message to the user.
    • The user must click "OK" to proceed.

    Confirm Box

    • Asks the user to confirm or accept something.
    • The user clicks either "OK" (returns true) or "Cancel" (returns false).
    • The window.confirm() method can be used directly without the window prefix.

    Prompt Box

    • Prompts the user to enter a value.
    • Returns the input value if the user clicks "OK" or null if they click "Cancel".

    The Document Object Model (DOM)

    • The DOM represents the structure of an HTML document.
    • It provides access to elements, attributes, styles, and events.
    • JavaScript can change all HTML elements, attributes, and styles.
    • DOM methods allow actions to be performed on HTML elements.

    Finding HTML Elements

    • The document object represents the entire web page.
    • Access elements using methods like getElementById(), getElementsByTagName(), querySelector(), and querySelectorAll().

    Changing HTML Content

    • The DOM enables content modification using the innerHTML property.
    • To change the content of an HTML element:
      • element.innerHTML = "new content";
      • Example: document.getElementById("myDiv").innerHTML = "This is new content!";

    Changing HTML Style

    • The DOM allows manipulating styles using the style property.
    • Change styles using JavaScript:
      • element.style.property = "value";
      • Example: document.getElementById("myDiv").style.color = "red";

    Using Events

    • Events occur in response to user actions or browser events.
    • Use the addEventListener() method to attach functions to events.
    • Example: document.getElementById("myButton").addEventListener("click", function() { alert("Button clicked!"); });

    The Browser Object Model

    • The Browser Object Model (BOM) allows JavaScript to interact with the browser.
    • Common BOM objects include:
      • Window
      • Navigator
      • Location
      • History
      • Screen

    The Window Object

    • The window object is globally accessible and represents the browser window.
    • Global variables are essentially properties of the window object.
    • Global functions are methods of the window object.
    • The document object (of the HTML DOM) is a property of the window object.

    Window Size

    • window.innerHeight returns the inner height of the browser window in pixels.
    • window.innerWidth returns the inner width of the browser window in pixels.

    Window Screen

    • The window.screen object provides information about the user's screen.
    • You can access this object directly without the window prefix.

    Window Location

    • The window.location object allows you to access and manipulate the current URL.
    • You can write this object without the window prefix.
    • The window.location.href property returns the URL of the current page.

    Window History

    • The window.history object stores the browser's history.
    • You can access it without the window prefix.
    • Due to privacy concerns, JavaScript has limited access to this object.

    Window Popup Boxes

    • JavaScript provides three types of popup boxes:
      • Alert Box: Displays a message and requires the user to click "OK" to proceed.
      • Confirm Box: Presents a message with "OK" and "Cancel" buttons, returning true if "OK" is clicked and false otherwise.
      • Prompt Box: Allows the user to input a value, returning the input if "OK" is clicked and null if "Cancel" is clicked.

    The Document Object Model

    Understanding of HTML DOM

    • The Document Object Model (DOM) represents the structure of an HTML webpage.
    • JavaScript can manipulate the DOM to dynamically change HTML content, attributes, styles, and events.

    DOM Document

    • The document object represents the entire web page.
    • Accessing any element of an HTML page starts with the document object.

    Finding HTML Elements

    • You can use various methods to find specific HTML elements, such as:
      • getElementById(): Finds an element by its ID.
      • getElementsByTagName(): Finds elements by their tag name.
      • getElementsByClassName(): Finds elements by their class name.

    Changing HTML Content

    • Use the innerHTML property to change the content of an HTML element:
      • document.getElementById("id").innerHTML = "New Content";

    Changing HTML Attributes

    • Modify an HTML element's attributes using the setAttribute() method:
      • document.getElementById("id").setAttribute("attribute", "new value");

    Changing HTML Style

    • Use the style property to change the style of an HTML element:
      • document.getElementById("id").style.color = "red";

    Using Events

    • JavaScript handles events triggered by actions on HTML elements.
    • You can attach event handlers using the addEventListener() method:
      • document.getElementById("id").addEventListener("click", function() { alert("Button clicked!"); });

    The Browser Object Model (BOM)

    • Allows JavaScript to interact with the browser
    • Includes objects like Window, Navigator, Location, History, and Screen

    The Window Object

    • Represents the browser's window
    • Global variables are properties of the window object
    • Global functions are methods of the window object
    • The document object is a property of the window object

    Window Size

    • window.innerHeight: inner height of the browser window (in pixels)
    • window.innerWidth: inner width of the browser window (in pixels)

    Window Screen

    • window.screen object contains information about the user's screen.

    Window Location

    • window.location object provides information about the current URL.
    • window.location.href property returns the URL of the current page.

    Window History

    • window.history object contains the browser's history.

    Window Popup Boxes

    • There are three types of popup boxes:
      • Alert Box: Alerts the user with a message and requires an "OK" click to proceed.
      • Confirm Box: Asks the user to confirm an action with "OK" or "Cancel" options. Returns true for "OK" and false for "Cancel".
      • Prompt Box: Prompts the user for input. Returns the input value for "OK" and null for "Cancel".

    The Document Object Model (DOM)

    • Allows JavaScript to manipulate HTML elements, attributes, styles, and events.

    DOM Document

    • Represents the web page.
    • Accessing the document object is the starting point for manipulating HTML.

    Finding HTML Elements

    • The document object provides methods for finding HTML elements.

    Changing HTML Content

    • The innerHTML property is used to change the content of HTML elements.

    Changing HTML Style

    • The DOM allows JavaScript to change the style of HTML elements.

    Using Events

    • Allow code execution when events occur in HTML elements.

    ### Learning Summary

    • The Browser Object Model: Allows JavaScript to interact with the browser and includes objects like Window, Navigator, Location, History, and Screen.
    • The Document Object Model (DOM): Allows JavaScript to change the content of HTML elements, attributes, styles, and events.

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