HTML L19 Quiz

JavaScript is a scripting language that runs

• in the JavaScript compiler of the browser

• in the JavaScript compiler of the web server

• in the JavaScript engine of the browser

• in the JavaScript engine of the web server

JavaScript is commonly used to modify the contents of a web page

• when the page is loaded

• in response to a user action

• when the images of a page are loaded

• in response to web server actions

Which of the following is NOT a way to include JavaScript in the HTML for a web page?

• use a script element to load an external JavaScript file

• use an embed element to load an external JavaScript file

• embed JavaScript in a script element in the head section

• embed JavaScript in a script element in the body section

The DOM for a web page provides a hierarchy of nodes that represent

• the elements, contents, and attributes in the HTML

• the elements, attributes, and comments in the HTML

• the contents, attributes, and comments in the HTML

• the elements, contents, attributes, and comments in the HTML

The DOM for a web page is built

• before the page is loaded

• after the page is loaded

• as the page is loaded

• when the DOM is needed

When the DOM is changed by JavaScript, the changes

• are immediately shown in the browser window

• are shown the next time the page is loaded

• are shown when the page is refreshed

• are shown when the user takes the next action

When scripting the DOM with JavaScript, the $ sign is commonly used

• for the name of a function that gets the element with the specified id.

• for the name of the event handler that is triggered when a page is loaded

• to refer to the document object

• to refer to the current node in the DOM

Which of the following lines of JavaScript, will put the message “Invalid entry” into a label with its id attribute set to email_error?

• $("email_error").firstChild = "Invalid entry";

• $("email_error").firstChild.nodeValue = "Invalid entry";

• $("email_error").nodeValue.firstChild = "Invalid entry";

• $("email_error").firstChild.nodeValue.Invalid entry;

(Refer to example 19-1) Which of the three JavaScript functions are event handlers?

• $, printPage, and window.onload

• $ and printPage

• printPage and window.onload

• printPage

(Refer to example 19-1) What does the window.onload function do?

• Prints the page

• Sets up the event handler named printPage

• Prints the page when the button with its id set to printButton is clicked

• Calls the printPage function when the button with printBotton as its id is clicked