Question

Im calling a url and getting json data back, If there is no data returned then I would like to be able to tell this with jquery. If there is no data to be return then the page that is called is blank.

Currently I have

var urlToGetJsonWith = '_Chapters.aspx?videoid=' + videoid;

jQuery.getJSON(urlToGetChaptersWith, function (data) {


}

But obviously if there is no data, then the call back function would not be executed.

Anybody know how to tell if no json was returned?

Cheers,
Pete

Answer 1

You’re assumption is wrong. The callback is fired anyway (except there was an error on the transmission itself).

So you could just check the data object within your success handler.

if( data && data.something ) { 
}
else {
   // empty object
}

One thing to mention:

As of jQuery 1.4, if the JSON file contains a syntax error, the request will usually fail silently.