Question 1

Match between columns
                        Premises: Determines whether a value is not a number
Enables customization of validation feedback in modern browsers
Indicates that a form element must have a value
Checking that information provided by users conforms to rules
If all its properties are false , then its value is true
Stops a form from being submitted when the submit event is triggered
Persistence required for a user to accomplish a goal
Displays a validation error in a modern browser
Reduce the likelihood of user errors when completing a form
Provides guidance about what data should be entered in a text box

Accepted Answer

The Answer of validity object and bubble and friction and is...

Question 2

How can you add options to a selection list with JavaScript?

Accepted Answer

The answer of How can you add options to a...

Question 3

When a control's value is found to be invalid during constraint validation, the ____ event is triggered.

Accepted Answer

According to the HTML5 specification, the "invalid" event is triggered when a control's value fails to pass validity checks during constraint validation. This event allows for custom validation messages to be displayed to the user.

Question 4

To check a group of fields and trigger an error message if any of them is empty, you use a(n)____ statement.

Accepted Answer

A loop can be used to iterate through a group of fields to check if any of them is empty and trigger an error message accordingly. Debugger, console.log(), and submit are not used for this purpose.

Question 5

Instead of document.getElementsByTagName("form")[0] , you could use the code

Accepted Answer

The document.forms collection returns all the forms in the document as an array-like object. To access a specific form within the collection, you can use brackets and pass in the index of the form you want. In this case, using document.forms[0] will achieve the same thing as document.getElementsByTagName("form")[0].

Question 6

Describe two advantages of referencing form objects using methods such as getElementById()rather than the forms array.

Accepted Answer

The answer of Describe two advantages of referencing form objects...

Question 7

Describe the three behaviors that make up the placeholder effect in modern browsers, and that you need toreplicate with JavaScript for older browsers.

Accepted Answer

The answer of Describe the three behaviors that make up...

Question 8

Enhancements to HTML and to modern browsers have allowed browsers themselves to  perform many validation tasks without any extra JavaScript. This type of validation  is known as __________ validation.

Accepted Answer

The answer of Enhancements to HTML and to modern browsers...

Question 9

__________ is the process of checking that information provided by users conforms to rules to ensure that it appropriately answers a form's questions and is provided in a format that the site's back-end programs can work with.

Accepted Answer

The answer of __________ is the process of checking that...

Question 10

Creating a function to validate required fields generally involves retrieving the values of the  required fields and checking if the value of any of them is __________.

Accepted Answer

The answer of Creating a function to validate required fields...

Question 11

Use of the ____ attribute of the form element is not allowed in the strict DTD for XHTML.

Accepted Answer

The name attribute is not allowed in the strict DTD for XHTML.

Question 12

For any fields that require numeric values, you can use JavaScript's built-in ____   function  to determine whether a user actually entered a number.

Accepted Answer

The isNaN() function is specifically designed to determine if a value is not a number, so it is the best choice to validate if a user entered a numeric value in a field. The submit() function is used to submit a form, reset() is used to reset form fields, and validate() is not a built-in JavaScript function.

Question 13

Describe how you can use JavaScript to simulate the behavior of the placeholder attribute in older browsers?.

Accepted Answer

The answer of Describe how you can use JavaScript to...

Question 14

What does a function to validate required fields generally need to do?

Accepted Answer

The answer of What does a function to validate required...

Question 15

The requirements of the form you're validating determine the kind of logic you need to  incorporate into a custom validation program. However, a few types of validation functions  are particularly common. Name two.

Accepted Answer

The answer of The requirements of the form you're validating...

Question 16

Why is is usually not necessary to include testing for the number of characters in user input in custom validation functions?

Accepted Answer

The answer of Why is is usually not necessary to...

Question 17

If you were designing a form with a question that asked users if they had ever visited a certain city, would you expect more accurate input using a text input box or a check box? Why?

Accepted Answer

The answer of If you were designing a form with...

Question 18

In what situations can you get more accurate information on a form byusing form fields other than text boxes? Name two types of fields you might use instead.

Accepted Answer

The answer of In what situations can you get more...

Question 19

For all custom validation, it can be helpful to use the __________  structure for handling errors.

Accepted Answer

The answer of For all custom validation, it can be...

Question 20

To send the values entered in a form to a web server with JavaScript, you use the __________ method.

Accepted Answer

The answer of To send the values entered in a...

Quiz 6: Enhancing and Validating Forms

Match each statement below with correct item:

How can you add options to a selection list with JavaScript?

When a control's value is found to be invalid during constraint validation, the ____ event is triggered.

To check a group of fields and trigger an error message if any of them is empty, you use a(n) ____ statement.

Instead of document.getElementsByTagName("form") [0] , you could use the code

Describe two advantages of referencing form objects using methods such as getElementById()rather than the forms array.

Describe the three behaviors that make up the placeholder effect in modern browsers, and that you need toreplicate with JavaScript for older browsers.

Enhancements to HTML and to modern browsers have allowed browsers themselves to perform many validation tasks without any extra JavaScript. This type of validation is known as __________ validation.

__________ is the process of checking that information provided by users conforms to rules to ensure that it appropriately answers a form's questions and is provided in a format that the site's back-end programs can work with.

Creating a function to validate required fields generally involves retrieving the values of the required fields and checking if the value of any of them is __________.