jQuery append new key value pair to existing data attribute

Question

Is this possible, my div data attribute is:

data-obj="{"__type":"GalleryImgModel","GalleryImageId":49,"GalleryId":0,"PersonId":264}"

and the jquery I tried based on the docs (Ive already defined item correctly!)

item.data('obj',{"MoreThanOneImage" : moreThanOneImage});

Help would be great thanks

the data-obj attribute value is not correct as the string enclosing quotes are messing with quotes of json attributes — Arun P Johny
– Arun P Johny, Commented Jul 19, 2013 at 10:59

founddrama · Accepted Answer · 2013-07-19 10:59:32Z

1

You need to convert the data attribute string to an object first, then add the value(s). Try something like:

$('#my-element').data($.extend({'new-key':'new-value'},
    JSON.parse($('#my-element').data()));

Something like that should do the trick.

answered Jul 19, 2013 at 10:59

founddrama

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2 Comments

DavidB Over a year ago

Thanks I used $.extend(item.data('obj'), { "MoreThanOneImage": moreThanOneImage }) and it worked fine

founddrama Over a year ago

Glad to hear that it helped! Normally I'd say to be careful with the order of your arguments to $.extend and to remember that it's mutating state in-place -- but here it doesn't really make a difference.

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