Errata

hide; should be hide();

Note from the Author or Editor:
Confirmed.

Please replace the code in the middle left cloud with that suggested by the error reported.

$("p").hide();

The formula for the random number between 5 and 10 is not correct. The fix proposed by another commenter is also not correct. If given a random real number between 0 inclusive and 1 exclusive, i.e. [0, 1) then a random integer between 5 and 10 is given by:

Math.floor(Math.random() * 6) + 5

Math.random() --> Real number [0, 1)
Math.random() * 6 --> Real number [0, 6)
Math.floor(Math.random() * 6) --> Integer [0, 5]
Math.floor(Math.random() * 6) + 5 --> Integer [5, 10]

An important feature of this formula is that it protects the uniformity of the distribution.

Thank you

Note from the Author or Editor:
What the error reporter outlined is correct.
This line:
Math.floor(Math.random() * 5) + 5
needs to be replaced with this line:
Math.floor(Math.random() * 6) + 5

On the following pages:
57, 58 (x2), 61, 64, 69, 70 .

Downgrading to a minor mistake, since the code would give a number between 5 and 9, as opposed to 5 and 10.

The code reads

alert(discount);

Using this, only the discounted amount will pop up. It should read

alert(discount_msg);

This will display the message, "Your Discount is " plus the random discount amount.

Note from the Author or Editor:
This is correct and confirmed.

The line of code should read:
alert(discount_msg);

It is correct in all other places it is mentioned.

Actually we want to append the discount_msg variable to the element, not the discount variable.

Note from the Author or Editor:
The exercise description at the bottom should read:

With what you know about selectors already and your new append powers, write the code to append the discount_msg variable to your guess_box element.

Kindle Version

The book has the following:

discount = "<p>Your Code: CODE"+my_num+"</p> ;

There is no ending double quote before the semi-colon. The statement should show as follows:

discount = "<p>Your Code: CODE"+my_num+"</p>";

Note from the Author or Editor:
This is a confirmed error.

Please replace the noted line with the solution proposed by the error reported.

$(".menu_list").children().slice(1,3); should point to li items 1 and 2. Illustration only points to item 2. Also text is incorrect. It indicates items selected are between the two index numbers you put in parentheses. It should indicate items selected start with the first index and continue up but not including the end index.

The correct selection is shown on page 164 in the example:

$(".menu_list").parent().slice(1,3);

where indexed items 1 and 2 are selected.

The error on page 162 is easily confirmed by adding the following code and seeing which items get hilighted:

$(".menu_list").children().slice(1,3).css('background-color', 'red');

Note from the Author or Editor:
This is confirmed.
In order to select the item that is indicated by the arrow, the code (ONLY on page 162), should read as follows:
$(".menu_list").parent().slice(2,3); - the comment beside it should read:
"In this case, only one element will be returned - the third li element"

In the last section, where you use the filter method, you point out two arrows out of it, showing that it will select both ul with the organic class...

In fact, it will only select the top one, since we START at the second ul (with the class menu_list AND organic) and THEN select the parents (which, of course, doesn't include the current element). So, in fact we start at the "li" above the second "ul" and move up... so we end up with only the top ul selected...

Note from the Author or Editor:
Page number of error:
162

Location on the page:
The second line of annotated code reads as follows:
$(".menu_list").parents().filter(".organic");

Two arrows come off of the highlighted code that reads
filter(".organic")

The bottom arrow should be removed.

A sentence should be added to the directions for the fridge magnets at the top of the jQuery page that says this:

Hint: The interval for lightning_two should be 5000 milliseconds; The interval for lightning_three should be 7000 milliseconds.

------------------------------------
Four magnets also need to be changed.

1. The two magnets that reads as follows:
(t){

Should read as follows:
(){

2. One of the magnets that reads as follows:
t);

Should read as follows:
5000);

3. One of the magnets that reads as follows:
t);

Should read as follows:
7000);

Two magnets need to be changed.

1. On the third line of the code solution, the magnet that reads as follows:
t);

Should read as follows:
5000);

2. On the seventh line of the code solution, the magnet that reads as follows:
t);

Should read as follows:
7000);

The hit function attempts to assign a value to a object that has not been created yet:

hand.cards[hand.cards.length] = c;

We don't even create the hand object until a few pages later. This causes a undefined resource error.

I removed this line and the script ran fine.

Note from the Author or Editor:
Confirmed.
This line should only appear after the next section, after the 'hand' object is created. This code should reflect the code for 'step 2'.

This line should be removed from both page 233 and 234

The service.php file in the end folder assumes that the database is named "race_info", whereas the code in the book assumes that it is named "hfjq_race_info".

Note from the Author or Editor:
This is confirmed.

The downloadable code for this page should be updated to be the following file:
thinkjquery.com/chapter09/ch09.zip
(This needs to replace the file on http://www.headfirstlabs.com/books/hfjquery/ch09.zip)

Downloaded code for Chapter 10: the sightings_begin.html file in the begin folder has "sightings.php" listed as the form action. Should be "service.php".

Note from the Author or Editor:
Confirmed.

The downloadable content (http://www.headfirstlabs.com/books/hfjquery/ch10.zip) should be updated from here:
thinkjquery.com/chapter10/ch10.zip

The <input> fields should have a "value" attribute of the creature type. As printed the $_POST['creature_type'] for each button is equal to "on".

Note from the Author or Editor:
This is confirmed.
The magnets on pages 387 and 388 should read as follows:

<div id="type_select">
<input type="radio" id="radio1" name="creature_type" value="Chupacabras"/>
<label for="radio1">Chupacabras</label>
<input type="radio" id="radio2" name="creature_type" value="Jersey Devil"/>
<label for="radio2">Jersey Devil</label>
<input type="radio" id="radio3" name="creature_type" value="Loch Ness Monster"/>
<label for="radio3">Loch Ness Monster</label>
<input type="radio" id="radio4" name="creature_type" value="Sasquatch"/>
<label for="radio4">Sasquatch</label>
<input type="radio" id="radio5" name="creature_type" value="Yeti"/>
<label for="radio5">Yeti</label>
<input type="radio" id="radio6" name="creature_type" value="Other"/>
<label for="radio6">Other</label>
</div>


The 'value' attribute is added to each "<input ..." line

The double slash "//" is not a legitimate comment indicator for css. Should be "/*comment*/".

Note from the Author or Editor:
This is confirmed. It does not affect the functionality of the page, but it is technically incorrect.

The fist line in the code on page 400 should read:
/* color slider styles */

$("#swatch").$("#swatch").css

should be :

$("#swatch").css

Note from the Author or Editor:
On page 404, under the exercise solution code, line 6 reads as follows:

$( "#swatch" ).$( "#swatch" ).css( "background-color", my_rgb );

The above is a typo. It should read as follows:

$( "#swatch" ).css( "background-color", my_rgb );

sightings.sql code: shouldn't there be a "use hfjq_sightings" there before attempting to create the table?

Note from the Author or Editor:
This is confirmed.

The download file (http://www.headfirstlabs.com/books/hfjquery/ch10.zip ) should be updated with the file available here:
http://thinkjquery.com/chapter10/ch10.zip

There should not be a "dot" between "LatLng" and its arguments.

Note from the Author or Editor:
This is accurate.
The line should read as follows:
var latlng = new google.maps.LatLng______________; (page 417)
and
var latlng = new google.maps.LatLng(45.519098, -122.672138); (page 418)

Remove the final . in both cases.

Same problem on line 74 of service.php: array key "weight" is unquoted.

Note from the Author or Editor:
This is confirmed.

The download link (http://thinkjquery.com/chapter11/service.zip) has been updated.

However, the downloadable content from headfirstlabs.com also needs to be updated.