javascript - Alert message if there is new data on server -


i'm building simple phonegap application new messages mysql server , show them user. application supposed json 

 {     "key": [         {             "message": "test"         }     ] }

from server every minute , alerts if there new. right alerts message "test" every time though json has changed this:

{"key":[]}

after application has asked server first time.

this js use 

 setinterval ( "getmessages()", 60000 ); function getmessages() {     $.getjson(serviceurl + 'messages.php' ,function(result){     $.each(result.key, function(index, field){     alert(field.message);   }); }); }

the request being cached browser. change url to:

serviceurl + 'messages.php?' + new date().gettime()

this trick browser thinking it's different request each time , therefore avoids issues caching.


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