Here is my Gwt Problem. Say, I got a form that has email, firstName,
username, password... Textboxes & a submit Button. When users click Submit,
the client will validate all fields, after all fields are ok, then they
will be sent to Server for another *EXACTLY* same validation.
Someone suggested me to make a Utility class & put that class into the *
shared* package.
Look at this code
In my.com.client package:
import my.com.shared.Utility;
public class CustPresenter extends
Presenter<CustPresenter.MyView, CustPresenter.MyProxy> {
@Inject DispatchAsync dispatchAsync;
public void postData(){
PostData postDataAction=new PostData();
String fName=fNameTextBox.getText();
String lName=lNameTextBox.getText();
//....... more field here ....//
if(!Utility.isOKString(fName)){
MyDialogBox myD=new MyDialogBox(fName, "Not OK");
}
else if (!Utility.isOKString(lName)){
MyDialogBox myD=new MyDialogBox(lName, "Not OK");
}
///.......more checking here//
postDataAction.setFName(fName);
postDataAction.setFName(lName);
//... more setting here...//
dispatchAsync.execute(postDataAction, postDataCallback);
}
private AsyncCallback<PostDataResult> postDataCallback=new
AsyncCallback<PostDataResult>(){
@Override
public void onFailure(Throwable caught) {
}
@Override
public void onSuccess(PostDataResult result) {
String resultStr=result.getResult();
if(resultStr.equals("fName is not OK")){
MyDialogBox myD=new MyDialogBox(fName, "Not OK");
}
else if (resultStr.equals("lName is not OK")){
MyDialogBox myD=new MyDialogBox(lName, "Not OK");
}
/// more displaying err message...
}
};
}
in my.com.server package
import my.com.shared.Utility;
public class PostDataActionHandler implements
ActionHandler<PostData, PostDataResult> {
@Override
public PostDataResult execute(PostData action, ExecutionContext context)
throws ActionException {
String fName=action.getFName();
String lName=action.getLName();
//more geting here....//
String resultInfo="";
if(!Utility.isOKString(fName)){
resultInfo="fName is not OK";
}
else if (!Utility.isOKString(lName)){
resultInfo="lName is not OK";
}
////... more checking here///
else{
postData();
}
return new PostDataResult(resultInfo);
}
}
As you can see in this structure, even I used Utility in shared package, i
still have to validate the same data 3 times. And there're a lot of
duplicates.
So my question is:
Can we create a certain Validation class (or design a certain Structure) &
put that class in shared package & so client & server can use it, so i just
need to validate 1 time rather than doing it 3 times like this?
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