variable contains id name, how to select based on variable name

Brad Bansner
Brad Bansner used Ask the Experts™
on
The variable "value" has the name of an ID (build that in line 1). Lines 2 and 3 are attempting to do things to objects with the ID of what the variable contains. But I get an error:

$('#'+value).attr('id').addClass is not a function
var value=$(this).attr('id').replace('dir_', 'day_');
$('#'+value).attr('id').addClass('dayblockhl');
$('#'+value).attr('id').children('.gr_mwc_monthblockarrow').addClass('gr_mwc_monthblockarrowhl');

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Commented:
Hi,

it looks like you have a couple things going on here.

1. you are changing the id of the item you are trying to work with, so if it was id of "testdir_1" you are retrieving testday_1, are you sure an element with the changed id exists?

2. you are trying to add a class to an attribute. Attributes do not have an addClass function, try:


assuming that line in your code above is valid
var value=$(this).attr('id').replace('dir_', 'day_');
$('#'+value).addClass('dayblockhl');
$('#'+value).children('.gr_mwc_monthblockarrow').addClass('gr_mwc_monthblockarrowhl');

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haloexpertsexchange
Commented:
why are you putting in  the .attr('id')? it  looks like you are trying to do everything to the id attribute not the actual element.
leakim971Multitechnician
Top Expert 2014

Commented:
@haloexpertsexchange's right (no point please) :
var value=$(this).attr('id').replace('dir_', 'day_');
$('#'+value).addClass('dayblockhl');
$('#'+value).children('.gr_mwc_monthblockarrow').addClass('gr_mwc_monthblockarrowhl');
//$('#'+value).find('.gr_mwc_monthblockarrow').addClass('gr_mwc_monthblockarrowhl');

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Brad BansnerWeb Developer

Author

Commented:
Yes, you were both right... two different ways of saying the same thing. I left that attr('id') in by accident. I am slowly learning how to do this stuff on my own. Thank you!

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