javascript - Dart JSONP callback error -


i trying receive data using jsonp. when hit https://ajax.googleapis.com/ajax/services/search/news?v=1.0&q=barack%20obama&callback=callbackforjsonpapi

i response fine:

callbackforjsonpapi({response here})

but when go https://api.forecast.io/forecast/apikeyhere/37.8267,-122.423?callback=callbackforjsonapi get:

typeof callbackforjsonapi === 'function' && callbackforjsonapi({ response here})

can explain why have "typeof" part prepended 1 response not other?

this site.dart file:

void main() {    // listen postmessage main page   window.onmessage.listen(datareceived);   scriptelement script = new element.tag("script");   script.src = "https://api.forecast.io/forecast/apikey/37.8267,-122.423?callback=callbackforjsonapi";   document.body.children.add(script); }  datareceived(messageevent datareceived) {   var data = json.parse(datareceived.data);   print(data['responsedata']); }

this partial html:

<html>     <body>         <script type="text/javascript">           function callbackforjsonpapi(s) {             var data = json.stringify(s);             window.postmessage(data, '*');           }     </body> </html>

i can't explain why these different; seems bit of oversight on google's part (presumably should same).

both of them valid; 1 check looks best; it's trying call function if exists (and function); stop javascript error if haven't declared function.

if you're pulling in server-side , spitting code page; should try , make code tolerate both of these; in case happen different behaviour in future (eg. if google make these consistent).


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