Maybe I'm doing something a little crazy here, but I'm trying to write a winform .NET app with a simple HTTP listener to handle Ext data requests. When my app serves the page and the data and I'm using an HttpProxy like so:
proxy: new Ext.data.HttpProxy({
url: 'getFeed?category=0'
}),
The data comes back and is displayed in the grid, no problems. But I'd rather have the page content be served as local files to the browser and only process the data requests with my HTTP listener, but when I use:
proxy: new Ext.data.ScriptTagProxy({
url: 'http://localhost:1966/getFeed?category=0'
}),
It seems to just timeout without displaying any data or errors. FireBug does show the data coming back to the browser. Here is my C# listener code (note I am checking for the callback to properly set the context and include the parens):
protected override void ProcessRequest(System.Net.HttpListenerContext Context)
{
HttpListenerRequest Request = Context.Request;
HttpListenerResponse Response = Context.Response;
try {
byte msg;
if (Request.RawUrl.StartsWith("/getFeed")) {
bool scriptTag = (Request.QueryString.GetValues("callback") != null);
Response.ContentType = (scriptTag) ? "text/javascript" : "application/x-json";
string s;
if (scriptTag)
s = "({"itemCount":4,"items":[{"itemId":"1","title":"Top 10 Startups Worth Watching in 2008","author":"","link":"http://feeds.wired.com/~r/wired/topheadlines/~3/205455458/YE_10_startups","description":"Which startups are worth paying attention to in the coming year? We pick 10 companies that should be making significant strides in 2008.","date":"12/24 5:00"},{"itemId":"2","title":"Live Music Webcasting Starts Making Sense in 2008","author":"Eliot Van Buskirk","link":"http://feeds.wired.com/~r/wired/topheadlines/~3/205455459/listeningpost_1224","description":"After a disappointing start, live online music is poised for success. With new technology and Web 2.0 networks in place to fuel the boom, record labels become the last remaining sticking point between you and some rockin' web shows. Commentary by Eliot Van Buskirk.","date":"12/24 5:00"},{"itemId":"3","title":"Home Sweet Gadget: How Our Technolust Helped Bring Down the Housing Market","author":"","link":"http://feeds.wired.com/~r/wired/topheadlines/~3/205455460/st_essay","description":"Builders responded to new demands for houses built to accommodate their owner's technolust. They built lots of homes and packed them with every new gewgaw a potential buyer might dream of. And then they built some more. Now, thanks to the housing bust, virgin homes and condos sit unoccupied in cities like Las Vegas, Phoenix, Miami, and, yes, Orlando.","date":"12/24 5:00"},{"itemId":"4","title":" extsharp - Google Code::
Added DataView sample (incomplete - plugins have not been implemented) add a bit a script into the ScriptSharpAdapter.init() method to get this to work
http://code.google.com/p/extsharp/source/browse/trunk/CHANGELOG.txtHOME |
Be Kind Rewind Director Michel Gondry Forgoes Dreamy Plots for Straight-Up Comedy","author":"Michel Gondry","link":"http://feeds.wired.com/~r/wired/topheadlines/~3/205455461/ff_gondry","description":"Michel Gondry is famous for making films with backward plots and gauzy sequences. His new work, about two video-store clerks who remake famous movies, is a straight-up narrative with crowd-pleasing Jack Black pratfalls. But don't worry — Gondry's still messing with Hollywood.","date":"12/24 5:00"}]})";
else
Minimum code needed for Ext.data.ScriptTagProxy - Ext JS Forums::
4 posts - Last post: Jan 12, 2008ScriptTagProxy class in my API? Some clients might not wish to ScriptTagProxy is designed to work with a Reader and a Store to read a
http://yui-ext.com/forum/showthread.php?t=22880HOME |
[Solved] NS_ERROR_ILLEGAL_VALUE exception when using ::
7 posts - Last post: Jan 23, 2008I was able to find a working solution however, albeit hackey. Store with a ScriptTagProxy and a JsonReader. It will work.
http://extjs.com/forum/showthread.php?t=23074HOME |
s = "{"itemCount":4,"items":[{"itemId":"1","title":"Top 10 Startups Worth Watching in 2008","author":"","link":"http://feeds.wired.com/~r/wired/topheadlines/~3/205455458/YE_10_startups","description":"Which startups are worth paying attention to in the coming year? We pick 10 companies that should be making significant strides in 2008.","date":"12/24 5:00"},{"itemId":"2","title":"Live Music Webcasting Starts Making Sense in 2008","author":"Eliot Van Buskirk","link":"http://feeds.wired.com/~r/wired/topheadlines/~3/205455459/listeningpost_1224","description":"After a disappointing start, live online music is poised for success. With new technology and Web 2.0 networks in place to fuel the boom, record labels become the last remaining sticking point between you and some rockin' web shows. Commentary by Eliot Van Buskirk.","date":"12/24 5:00"},{"itemId":"3","title":"Home Sweet Gadget: How Our Technolust Helped Bring Down the Housing Market","author":"","link":"http://feeds.wired.com/~r/wired/topheadlines/~3/205455460/st_essay","description":"Builders responded to new demands for houses built to accommodate their owner's technolust. They built lots of homes and packed them with every new gewgaw a potential buyer might dream of. And then they built some more. Now, thanks to the housing bust, virgin homes and condos sit unoccupied in cities like Las Vegas, Phoenix, Miami, and, yes, Orlando.","date":"12/24 5:00"},{"itemId":"4","title":" Autoload and Contentbody - Page 2 - Ext JS Forums::
ScriptTagProxy({ url: 'form.jsp' }); /* var myReader = Ext.data. Get up to speed quickly with on-site training provided by Ext
http://www.yui-ext.net/forum/showthread.php?p=224504HOME |
Be Kind Rewind Director Michel Gondry Forgoes Dreamy Plots for Straight-Up Comedy","author":"Michel Gondry","link":"http://feeds.wired.com/~r/wired/topheadlines/~3/205455461/ff_gondry","description":"Michel Gondry is famous for making films with backward plots and gauzy sequences. His new work, about two video-store clerks who remake famous movies, is a straight-up narrative with crowd-pleasing Jack Black pratfalls. But don't worry — Gondry's still messing with Hollywood.","date":"12/24 5:00"}]}";
msg = Encoding.UTF8.GetBytes (s);
} else {
string path = _baseFolder + Request.RawUrl;
//string path = Path.Combine (_baseFolder, filename);
if (!File.Exists (path)) {
Response.ContentType = "text/html";
Response.StatusCode = (int) HttpStatusCode.NotFound;
msg = Encoding.UTF8.GetBytes ("Sorry, that page does not exist");
} else {
Response.StatusCode = (int) HttpStatusCode.OK;
msg = File.ReadAllBytes (path);
}
}
Response.ContentLength64 = msg.Length;
using (Stream stream = Response.OutputStream)
stream.Write (msg, 0, msg.Length);
Response.Close();
} catch (Exception ex) { Console.WriteLine ("Request error: " + ex); }
}
}
When I was looking at the docs and modeled my code, I didn't faithfully translate the Java code and specifically I overlooked the "cb" highlighted below...
boolean scriptTag = false;
String cb = request.getParameter("callback");
if (cb != null) {
scriptTag = true;
response.setContentType("text/javascript");
} else {
response.setContentType("application/x-json");
}
Writer out = response.getWriter();
if (scriptTag) {
out.write(cb + "(");
}
out.print(dataBlock.toJsonString());
if (scriptTag) {
out.write(");");
}
When I searched the forum based on your response I found another post (http://75.126.167.146/forum/showthread.php?p=25641#post25641) by Animal where it's more obvious:
String callbackFn = request.getParameter("callback");
if (callbackFn != null) {
out.write(callbackFn + "(");
}
out.write(myJsonData); // or call a method to output the Json data...
if (callbackFn != null) {
out.write(");");
}
I'm sure that's what my problem is and I'll confirm as soon as I get home. Thanks!
Thanks for your reply Jeff. I did not see any errors (none are shown by FireBug). I didn't tried using the loadexception handler yet. I'm new to JSON and Ext. Can you explain what you mean by: "When using a scripttagproxy, is it returned with the JSON data wrapped with the callback function?"? I see the response and it looks just like what is hard coded (for now) in my HttpListener code above. When I call the listener using the ScriptTagProxy, the JSON data is wrapped with parens. Should I see a function reference in the repsonse data too?
What does your response look like? When using a scripttagproxy, is it returned with the JSON data wrapped with the callback function? Are you getting any errors?
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[Solved][2.0]Not able to get ScriptTagProxy to work...