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jQuery.each breaks on undefined object

in Using jQuery • 7 years ago

Hi,

I'd like to ask some enlightenment on what's the reason behind $.each function breaks the loop when there is an undefined object. This is a sample link

Replies(7)

jakecigar

Re: jQuery.each breaks on undefined object

7 years ago

https://jsfiddle.net/jakecigar/x8qop7g9/1/

Test before you append.

JΛ̊KE

root

Re: jQuery.each breaks on undefined object

7 years ago

I did test but I was just wondering why it breaks up on 2nd level json. On a single level json, the $.each loop continues even on an undefined object. Just curious about the reason behind because we might come-up on a json result without certain objects that could stop appending the rest of the objects

jakecigar

Re: jQuery.each breaks on undefined object

7 years ago

If v.img does not exist you cannot reference v.img[0].thumb.

I could have tested that v.img is an array and the 0’th element is an object as well, just to be sure.

JΛ̊KE

root

Re: Re: jQuery.each breaks on undefined object

7 years ago

Yes but why does the loop break? instead of just throwing the error and continue?

jakecigar

Re: jQuery.each breaks on undefined object

7 years ago

Your code throws an error, which is not caught, so the whole process dies and the loop ends.

If they were in different processes like https://jsfiddle.net/jakecigar/x8qop7g9/2/ , the process(setTimeout function) would die but the next loop still run.

It’s a javaScript thing.

JΛ̊KE

process may be the wrong word, but I could not find it.

root