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Dec 29, 2009 10:59 AM
by: mraj
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From:
Los Angeles
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fragments on page 35
Posted:
Oct 23, 2009 6:12 PM
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Hi,
I was following along the examples in the book and found out that both:
$('img[alt]')[0]
and
$('img[alt]').get(0)
fragment on page 35 do not work when entered into the Wrap Set Lab page being discussed.
The error message is: error:TypeError: wrappedSet.addClass is not a function
Did I make anything wrong? I am a new comer and needs help.
Thanks,
Khim
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Posts:
64
From:
NJ
Registered:
7/1/09
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Re: fragments on page 35
Posted:
Oct 26, 2009 12:16 PM
in response to:
khim
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Hi Khim,
The Wrap Set Lab expects the result of the text you type into the textbox to yield a jQuery wrapped set -- because it then calls addClass() on that wrapped set.
So, $('img[alt]') will work, because the result is a jQuery wrapped set.
But $('img[alt]')[0] will not work, because the result is a DOM element, and that DOM element doesn't have an addClass() method.
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487
From:
Austin TX
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8/15/05
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Re: fragments on page 35
Posted:
Oct 26, 2009 12:23 PM
in response to:
mraj
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Thanks mraj, you beat me to it.
Yes, the "Wrapped Set" lab is exactly that -- a lab for wrapped sets. Any expression that results in anything else will, indeed, cause an error.
If you want to reduce a wrapped set to a single element, check out the eq() method, which returns a wrapped set (as opposed to get(), which returns a DOM element).
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Posts:
4
From:
Los Angeles
Registered:
10/23/09
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Re: fragments on page 35
Posted:
Oct 29, 2009 4:59 PM
in response to:
mraj
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Hi mraj,
Thank you for the explanation.
Khim
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Posts:
4
From:
Los Angeles
Registered:
10/23/09
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Re: fragments on page 35
Posted:
Oct 29, 2009 5:00 PM
in response to:
bear.bibeault
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Thank you for your explanation.
Khim
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Posts:
1
From:
mlore
Registered:
12/29/09
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Re: fragments on page 35
Posted:
Dec 29, 2009 9:34 AM
in response to:
khim
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Quote bear.bibeault : "If you want to reduce a wrapped set to a single element, check out the eq() method, which returns a wrapped set (as opposed to get(), which returns a DOM element). "
Thanks for the solution. i tried using the nth-child() method but ended up with the same error as i got with get(). does the nth-child() method return a DOM element as opposed to a wrapped set?? i even tried the other methods viz. first, last etc with no success. i could only get eq() method to return a wrapped set. please explain. thank you again.
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Posts:
64
From:
NJ
Registered:
7/1/09
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Re: fragments on page 35
Posted:
Dec 29, 2009 10:59 AM
in response to:
shripad
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Hi shripad,
Yes, filter :nth-child() does not return a jQuery wrapped set. Rather, it returns an array of DOM elements. Have a look at http://docs.jquery.com/Selectors (in particular, note "Returns: Array<Element(s)>").
Filters :first, :last, etc. also return an array of DOM elements -- see the aforementioned hyperlink.
eq(), filter(), slice(), etc. all return a jQuery wrapped set: http://docs.jquery.com/Traversing
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