Question

UPDATE

Here Ajax receives some responseimage from the server

success: function(responseimage)
            { 
.....
}

This gets object and puts it into result variable.

 result = jQuery.parseJSON(responseimage);

response image is always positive. It has always something inside

Problem is that sometimes in responseimage there is no JSON object.

So how can I check it after getting result frmo server is there any object or not ?

if( result = jQuery.parseJSON(responseimage)) crashes script
if( typeof jQuery.parseJSON(responseimage)!='undefined') crashes script

Any other ways to check ?

Answer 1

In lieu of writing a more intelligent tryParseJSON function (one may already exist, I’m not sure), I would simply wrap the parse call in a try-catch block:

 try {
     result = jQuery.parseJSON(responseimage);
 } catch (e) {
     result = {}; // Or some default value
 }