Hi, I'm new here and new to gwt.
I'm not a Java programmer, but I'm start to learn to use GWT.
I'm trying to use an extension of the ListBox widget to make it able
to collect data from a database by AJAX.
I found only an example on the web, but I obtain an uncaight exception
(class not found) at the first row of this example.
Can you help me? :-)
thanks!
Lorenzo
This is the code:
Note: the error is when it executes the line:
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET,
source);
ClassNotFoundException
arg0 = com/google/gwt/http/client/RequestBuilder
-----------
package com.myProject.client;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.Response;
import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.json.client.JSONValue;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.ListBox;
public class JsonListBox extends ListBox {
public JsonListBox(String source) {
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET,
source);
try {
builder.setCallback(new RequestCallback() {
public void onError(Request request, Throwable
exception) {
}
public void onResponseReceived(Request request,
Response response)
{
if (response.getStatusCode() == 200) {
JSONArray items =
JSONParser.parse(response.getText()).isArray
();
JSONValue jsonValue;
for (int i=0; i<items.size();
i++) {
JSONObject jsMyObject;
JSONString jsTitle, jsId;
if ((jsMyObject=
items.get(i).isObject()) == null) continue;
if ((jsonValue =
jsMyObject.get("title")) == null) continue;
if ((jsTitle=
jsonValue.isString()) == null) continue;
if ((jsonValue =
jsMyObject.get("id")) == null) continue;
if ((jsId =
jsonValue.isString()) == null) continue;
addItem(jsTitle.stringValue(), jsId.stringValue());
}
setVisibleItemCount(items.size());
} else {
Window.alert(response.getStatusText());
}
}
});
builder.send();
} catch (Exception e) {
Window.alert(e.getMessage());
}
}
}
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