Thanks for the code. This actually covers well the GET part, but as
you say, not the POST.
Thanks cause it is still very interesting implementation.
Does anybody has written or seen around a similar code that would also
support POST ?
Thanks for the help.
Arnaud
On 10 ago, 14:38, MiSt <m...@mist.pl> wrote:
> Inspired by someone's example I don't remember where I've found it.
> This method works only with GET
>
> Example:
>
> CrossSiteJsonRequestUtil.INSTANCE.doFetchURL("www.test.com",
> "callbackmethodname", new AsyncCallback<JSONObject>() {
>
> @Override
> public void onFailure(Throwable caught) {
> // TODO
>
> }
>
> @Override
> public void onSuccess(JSONObject result) {
> // TODO
>
> }
>
> });
>
> import java.util.HashMap;
> import java.util.Map;
>
> import com.google.gwt.core.client.JavaScriptObject;
> import com.google.gwt.json.client.JSONObject;
> import com.google.gwt.user.client.rpc.AsyncCallback;
>
> public class CrossSiteJsonRequestUtil {
>
> public static CrossSiteJsonRequestUtil INSTANCE = new
> CrossSiteJsonRequestUtil();
>
> private Map<String, AsyncCallback<JSONObject>> callbacks = new
> HashMap<String, AsyncCallback<JSONObject>>();
>
> private int curIndex = 0;
>
> private static final String CALLBACK_PARAM_NAME = "callback";
>
> public void doFetchURL(String baseUrl,
> AsyncCallback<JSONObject> responseHandler) {
> doFetchURL(baseUrl, CALLBACK_PARAM_NAME, responseHandler);
> }
>
> public void doFetchURL(String baseUrl, String callbackParamName,
> AsyncCallback<JSONObject> responseHandler) {
> String callbackName = reserveCallback(responseHandler);
> setup(callbackName);
>
> char sep;
> if (baseUrl.contains("?")) {
> sep = '&';
> } else {
> sep = '?';
> }
>
> addScript(callbackName, baseUrl + sep + callbackParamName + "="
> + callbackName);
>
> }
>
> private void setup(String callback) {
> setup(this, callback);
> }
>
> private String reserveCallback(AsyncCallback<JSONObject>
> responseHandler) {
> while (true) {
> if (!callbacks.containsKey("__gwt_callback" + curIndex)) {
> callbacks.put("__gwt_callback" + curIndex, responseHandler);
> return "__gwt_callback" + curIndex++;
> }
> }
> }
>
> private native static void setup(CrossSiteJsonRequestUtil
> instance,
> String callback) /*-{
> window[callback] = function(someData) {
> instan...@crosssitejsonrequestutil::handle(Lcom/google/gwt/
> core/client/JavaScriptObject;Ljava/lang/String;)(someData,callback);
> var scriptEl = document.getElementById(callback);
> document.getElementsByTagName("body")[0].removeChild
> (scriptEl);
> window[callback] =null;
> }
> }-*/;
>
> private native void addScript(String uniqueId, String url) /*-{
> var elem = document.createElement("script");
> elem.setAttribute("language", "JavaScript");
> elem.setAttribute("src", url);
> elem.setAttribute("id", uniqueId);
> document.getElementsByTagName("body")[0].appendChild(elem);
> }-*/;
>
> @SuppressWarnings("unused")
> private void handle(JavaScriptObject jso, String callback) {
> JSONObject jsonObject = null;
> AsyncCallback<JSONObject> responseHandler = callbacks.get(callback);
> try {
> jsonObject = new JSONObject(jso);
> } catch (RuntimeException e) {
> responseHandler.onFailure(e);
> }
> if (jsonObject != null) {
> responseHandler.onSuccess(jsonObject);
> }
>
> }
>
> }
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