Java Script c10

Question 9 (1 point)

Which of the following coding sequences can be used to validate the data on a form and submit it to the server?

Question 9 options:

	Within the click event handler of a regular button, validate the data and then issue the submit method of the form if the data is valid.
	Within the click event handler of a regular button, validate the data and then issue the submit method of the form if the data is valid or the preventDefault method if it isnt.
	Within the click event handler of a submit button, validate the data and then issue the submit method of the form if the data is valid
	Within the click event handler of a submit button, validate the data and then issue the submit method of the form if the data is valid or the preventDefault method if it isnt.

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Question 10 (1 point)

Code example 10-1 $(document).ready(function() { $("#contact_me").change( function() { if ($("#contact_me").attr("checked")) { $(":radio").attr("disabled", false); } else { $(":radio").attr("disabled", true); } } ); });

(Refer to code example 10-1) What does this code do?

Question 10 options:

	It disables or enables a specific radio button when an element is checked or unchecked.
	It disables or enables all radio buttons when an element is checked or unchecked.
	It disables or enables a specific check box when an element is checked or unchecked.
	It disables or enables all check boxes when an element is checked or unchecked.

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Question 11 (1 point)

Code example 10-1 $(document).ready(function() { $("#contact_me").change( function() { if ($("#contact_me").attr("checked")) { $(":radio").attr("disabled", false); } else { $(":radio").attr("disabled", true); } } ); });

(Refer to code example 10-1) What do the jQuery selectors in this code select?

Question 11 options:

	individual elements by id only
	disabled radio buttons only
	an individual element by id and disabled radio buttons
	an individual element by id and all radio buttons

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Question 12 (1 point)

Code example 10-2 $(document).ready(function() { $("#member_form").submit( function(event) { var isValid = true; . . var password = $("#password").val().trim(); if (password == "") { $("#password").next().text("This field is required."); isValid = false; } else if ( password.length

(Refer to code example 10-2) What does the preventDefault() method in this code do?

Question 12 options:

	It cancels the change() event method of the form.
	It cancels the submit() event method of the form.
	It triggers the change() event method of the form.
	It triggers the submit() event method of the form.

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Question 13 (1 point)

Code example 10-2 $(document).ready(function() { $("#member_form").submit( function(event) { var isValid = true; . . var password = $("#password").val().trim(); if (password == "") { $("#password").next().text("This field is required."); isValid = false; } else if ( password.length

(Refer to code example 10-2) Why is the following line of code necessary after the if-else statement? $("#password").val(password);

Question 13 options:

	The val() method removes the password entered by the user, so this code displays the original password.
	The next() method replaces the password entered by the user, so this code displays the original password.
	The text() method replaces the password entered by the user, so this code displays the original password.
	The trim() method removes extra spaces entered by the user, so this code displays the trimmed password.

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Question 14 (1 point)

Which of the following methods is not one of the methods that trigger events?

Question 14 options:

	focus()
	change()
	leave()
	select()

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Question 15 (1 point)

In the following code, what does the line of code in the else clause do? $(document).ready(function() { $("#join_list").click(function() { // join_list is a regular button if ( $("email_address").val() == "") { alert("Please enter an email address."); } else { $("#email_form").submit(); } }); });

Question 15 options:

	It handles the submit() event method.
	It triggers the submit() event method.
	It handles the click() event method.
	It triggers the click() event method.