Question

177

Checking if an element exists in json

rated 0 times [ 181] [ 4] / answers: 1 / hits: 54733 / 13 Years ago, fri, july 1, 2011, 12:00:00

using the following feed:

http://api.twitter.com/1/statuses/user_timeline.json?screen_name=microsoft&include_rts=1&count=10

I am successfully able to loop through this to get the details I want to display on my html page.

However, I need to check if retweeted_status.user.profile_image_url exists, and I am not sure how to do that?

Currently I am looping through the data where data is returned by jquery-ajax:

data[i].retweeted_status.user.profile_image_url

if data[i].retweeted_status.user.profile_image_url does not exist, it does not return null or undefined, I just get the following error:

cannot read property 'user' of undefined

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kevenjeffreyr

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4 Years ago

answered 13 Years ago harleyterryp · Accepted Answer

That error message suggests that either your data[i] or your retweeted_status is undefined, which means your call to get the json is most likely failing. WHen data is returned from Twitter it will aways have a profile image url, because they show an egg-like image for those with none uploaded. You should put this before your for loop:

if (typeof(retweeted_status) != undefined)

{

//code for what to do with json here

}