I'm trying to build an application in Flash, but I have a problem. I'd like to parse the JSON from an web URL.
link: JSON text to parse
I'd like to get the JSON string "title" from here. Is there a way I can do it?
It says undefined.
var VidDataLoader = new URLLoader();
var VidUrl = "THEURL" + param1.getString(0);
trace(VidUrl)
VidDataLoader.load( new URLRequest(VidUrl))
VidDataLoader.addEventListener(Event.COMPLETE, doneit)
function doneit(e:Event){ var myData:Object = JSON.parse(VidDataLoader.data);
You are trying to reach the data from the VidDataLoader class, but the loaded data is part of the event object:
public function JSONLoader() {
var loader:URLLoader = new URLLoader();
loader.addEventListener(Event.COMPLETE, decodeJSON);
loader.load(new URLRequest("myfile.json"));
}
// use the event to get the data
private function decodeJSON(e:Event):void {
var loader:URLLoader = URLLoader(e.target) ;
var jsonObject:Object = JSON.parse(loader.data);
}
Related
I have found Firebase, and it looks excellent for javascript / HTML5 usage.
But I was wondering if there is also an Actionscript API?
E.g
var myRootRef = new Firebase('https://myprojectname.firebaseIO-demo.com/');
myRootRef.set('Hello World!');
var dataRef = new Firebase('https://SampleChat.firebaseIO-demo.com/users/fred/name/first');
dataRef.on('value', function(snapshot) {
alert('fred’s first name is ' + snapshot.val());
});
So to set data and have listeners for updated data etc.
Thanks for any help
Matt
Doesn't look like there is an AS3 api available but the good news is that they have a rest api which is cross platform that you can write an AS3 wrapper around. (https://www.firebase.com/docs/rest-api.html) That is what I plan to do. I Want to use it with GameBuilder Studio.
If you are planning on embedding your application inside a web page (that you create) you could use an external javascript interface and communicate to firebase through that.
I'm planning on doing this myself to see how it turns out.
Connecting to Firebase using ActionScript 3 only requires the use of URLRequest and URLLoader. The following examples cover the 4 basic operations (CRUD).
To read data from an specific node from your Firebase database:
private function loadNews():void
{
var request:URLRequest = new URLRequest("https://<YOUR-PROJECT-ID>.firebaseio.com/<Node_to_read>.json");
var loader:URLLoader = new URLLoader();
loader.addEventListener(flash.events.Event.COMPLETE, newsLoaded);
loader.load(request);
}
private function newsLoaded(event:flash.events.Event):void
{
trace(event.currentTarget.data);
var rawData:Object = JSON.parse(event.currentTarget.data);
}
To insert data to a specific node:
private function saveEntry(title:String, description:String):void
{
var myObject:Object = new Object();
myObject.title = title;
myObject.description = description;
myObject.timestamp = new Date().getTime();
var request:URLRequest = new URLRequest("https://<YOUR-PROJECT-ID>.firebaseio.com/<Node_to_insert>.json");
request.data = JSON.stringify(myObject);
request.method = URLRequestMethod.POST;
var loader:URLLoader = new URLLoader();
loader.addEventListener(flash.events.Event.COMPLETE, entrySent);
loader.load(request);
}
private function entrySent(event:flash.events.Event):void
{
trace(event.currentTarget.data);
}
To delete a specific node:
private function deleteEntry():void
{
var header:URLRequestHeader = new URLRequestHeader("X-HTTP-Method-Override", "DELETE");
var request:URLRequest = new URLRequest("https://<YOUR-PROJECT-ID>.firebaseio.com/<Node_to_delete>.json");
request.method = URLRequestMethod.POST;
request.requestHeaders.push(header);
var loader:URLLoader = new URLLoader();
loader.addEventListener(flash.events.Event.COMPLETE, entryDeleted);
loader.load(request);
}
private function entryDeleted(event:flash.events.Event):void
{
trace(event.currentTarget.data);
}
To update/modify data to a specific node:
private function updateEntry(title:String, description:String):void
{
var header:URLRequestHeader = new URLRequestHeader("X-HTTP-Method-Override", "PATCH");
var myObject:Object = new Object();
myObject.title = title;
myObject.description = description;
var request:URLRequest = new URLRequest("https://<YOUR-PROJECT-ID>.firebaseio.com/journal/<Node_to_modify>.json");
request.data = JSON.stringify(myObject);
request.method = URLRequestMethod.POST;
request.requestHeaders.push(header);
var loader:URLLoader = new URLLoader();
loader.addEventListener(flash.events.Event.COMPLETE, entryUpdated);
loader.load(request);
}
private function entryUpdated(event:flash.events.Event):void
{
trace(event.currentTarget.data);
}
If you want further information I have written detailed Firebase REST guides and examples on how to use ActionScript 3 and Firebase.
I am trying to use the imdb API, in this case: http://imdbapi.org/
I need to search for a movie by name and get a json, then load an image with the poster obtained.
I'll be using as3 - flex to generate an Air package.
I tried this example, but can't seem to get it right.
import flash.net.*;
var url:String = "http://imdbapi.org/";
var request:URLRequest = new URLRequest(url);
request.method = URLRequestMethod.GET;
var variables:URLVariables = new URLVariables();
variables.name = "Pulp fiction";
request.data = variables;
var loader:URLLoader = new URLLoader();
loader.addEventListener(Event.COMPLETE, onComplete);
loader.dataFormat = URLLoaderDataFormat.TEXT;
loader.load(request);
function onComplete (event:Event):void {
trace(event.target.data);
}
Perhaps you could enlight me with an example of connecting to the api and retrieving that json so that I can load an image with the poster and generate my air package.
Many thanks!
The API seems to want the movie in the q param so change this
variables.name = "Pulp fiction";
to :
variables.q = "Pulp fiction";
To verify : http://imdbapi.org/?q=Pulp%20Fiction
From there getting the poster URL is just a matter of reading the correct property from the JSON string.
private function onComplete (event:Event):void {
var data:Array = JSON.parse(event.target.data);
if(data && data.length)
{
var movie:Object = data[0];
trace(movie.poster);
}
}
I'm using a URLLoader and URLRequest to make a call to youtube's api. The return is formatted as json and looks like the following: http://pastebin.com/WxPS9NCB.
I'm trying to capture the "href" value located on line 42 in the above pastebin. But the code I have isn't working.
var urlLoader:URLLoader = new URLLoader(new URLRequest(apiURL));
urlLoader.addEventListener(Event.COMPLETE, function(e:Event) {
var json:Object = e.target.data;
var href:String = json.link[0].href;
trace(href);
});
Any ideas?
Flash does not parse JSON automatically. Use AS3 core libs JSON parser (https://github.com/mikechambers/as3corelib)
And replace var json:Object = e.target.data; with var json:Object = JSON.decode(e.target.data);
EDIT:
After a cursory glance at the JSON file you should use json.feed.link[0].href to access the data you are looking for.
try this:
var urlLoader:URLLoader = new URLLoader();
urlLoader.load(new URLRequest(apiURL));
urlLoader.addEventListener(Event.COMPLETE, function(e:Event) {
var json:Object = e.target.data;
var href:String = json.link[0].href;
trace(href);
});
private function getTitle(src:String):String{
var urlLoader:URLLoader = new URLLoader();
var rssURLRequest:URLRequest = new URLRequest(src);
var rss:XML = new XML;
var t:String = src;
urlLoader.addEventListener(Event.COMPLETE,
function(event:Event):void{
rss = XML(urlLoader.data);
t = rss.channel.title.toString();
});
return t;
}
I'm aware that this code doesn't work because the anonymous function doesn't work until after t is returned. How would I make it so that it works?
You won't be able to return the loaded data from this method. The reason for this is because the loading is asynchronous and doesn't not block the execution of subsequent code. Your best option is to move the vars out of the scope of the function and to write a second function to handle the COMPLETE event.
Something like the following should work:
var rss:XML;
var t:String;
var path:String = "some path";
var urlLoader:URLLoader = new URLLoader();
private function getTitle(src:String):String
{
urlLoader.load( new URLRequest( src ) );
urlLoader.addEventListener(Event.COMPLETE, onComplete );
}
private function onComplete(event:Event):void
{
rss = XML(urlLoader.data);
t = path + rss.channel.title.toString();
}
I realize that this doesn't really answer the question directly, though it is the best practice for handling data loading. If you really want to stop any code from executing before the data is loaded, it may be possible use a while loop after the addEventListener line to halt the player from until the data is loaded. This should probably be considered a not so elegant hack though.
private function getTitle(src:String):String
{
var urlLoader:URLLoader = new URLLoader();
var rssURLRequest:URLRequest = new URLRequest(src);
var rss:XML = new XML;
var t:String = src;
var complete:Boolean;
urlLoader.addEventListener(Event.COMPLETE,
function(event:Event):void
{
rss = XML(urlLoader.data);
t = rss.channel.title.toString();
complete = true;
});
while( !complete ) { /* sleep hack */ }
return t;
}
I haven't tested this, but it seems like it could work. The first example is recommended.
We are collecting the data at run time in Collection object in JSP page. We want to read this data from the JSP in a MXML through actionscript.
pls share the sample if you have.
thanks,
Sudarshan
function loadData():void
{
var ldr:URLLoader = new URLLoader();
var request:URLRequest = new URLRequest("page.jsp");
ldr.addEventListener(Event.COMPLETE, onLoad);
ldr.load(request);
}
private function onLoad(e:Event):void
{
var ldr:URLLoader = URLLoader(e.target);
trace(ldr.data);//traces the loaded string
//if the data is xml
/*
var myxml:XML = new XML(ldr.data);
trace(myxml.toXMLString());
*/
//update: answer to the comment:
//If the input string just lacks a root tag from being valid xml,
//you can introduce a dummy root tag.
var myxml:XML = new XML("<root>" + ldr.data + "</root>");
trace(myxml.data.toString()); //Hello
trace(myxml.value.toString()); //Hi
}
page.jsp should serialize the collection to appropriate format (xml/json/whatever) and return it.