B4J Question GetVal.Value - Waiting for value

ilan

Expert
Licensed User
Longtime User
hi

i use WebSocket in my b4j web app and i get a lot of "Waiting for value (110 ms)" in the logs and i wonder if i am doing something wrong?

i have a form and i am getting the data from the Textfields via JQueryElement. i could use a form-post request instead. is that the better approach?
or can i still use JQueryElements and get the data via GetVal.Value but avoid too many "Waiting for value (110 ms)" logs?

this is how my logs look like:

 
Sort by date Sort by votes

ilan

Expert
Licensed User
Longtime User
actually, this is the jqueryElement click event:

B4X: 
Sub sigupBtn_Click (Params As Map)
    Dim userN As String = su_user.GetVal.Value
    Dim userP As String = su_pass.GetVal.Value
    Dim userE As String = su_email.GetVal.Value

    '.....
End Sub

i saw that also in your guess my number _ws example there is a delay when you call .GetVal.Value like something is refreshed in the background.
 
Upvote 0

ilan

Expert
Licensed User
Longtime User
Erel said:
This code is exactly how you shouldn't get the values.

See the network latency section: https://www.b4x.com/android/forum/threads/webapp-hello-world-web-app.39808/#content
Click to expand...

ok, I had a look at the thread. did not understand everything but will read it again.

anyway, i assumed that this is the way to do it since it is in the guessmynumber_ws example:



but after changing to this:

B4X: 
    Dim ft1 As Future = su_user.GetVal
    Dim ft2 As Future = su_pass.GetVal
    Dim ft3 As Future = su_email.GetVal
    Dim ft4 As Future = su_fname.GetVal
    Dim ft5 As Future = su_lname.GetVal
    
    Dim userN As String = ft1.Value
    Dim userP As String = ft2.Value
    Dim userE As String = ft3.Value
    Dim firstN As String = ft4.Value
    Dim lastN As String = ft5.Value   
    
    Log(userN)
    Log(userP)
    Log(userE)
    Log(firstN)
    Log(lastN)

i get only 1 time Waiting for value (114 ms) what makes it much much faster now. i don't understand why but if it works i won't ask to many questions
 
Upvote 0

ilan

Expert
Licensed User
Longtime User
ilan said:
i don't understand why but if it works i won't ask to many questions
Click to expand...

ok understand now

The correct design is quite simple. When the event starts you need to get all the future values that later are needed.
Only then you should call Future.Value. This allows you to get all the values in a single round trip (Server -> Client -> Server).
Click to expand...
 
Upvote 0
You must log in or register to reply here.

Similar Threads

  • Article
Android Tutorial [B4X] Resumable subs that return values (ResumableSub)
2
Replies
24
Views
56K
Erel
  • Article
B4J Code Snippet Resumable Subs (wait for / sleep) in server handlers
Replies
6
Views
11K
derez
  • Locked
  • Article
Android Tutorial [B4X] SQL with Wait For
Replies
16
Views
30K
Erel
  • Locked
  • Article
Android Tutorial [B4X] OkHttpUtils2 with Wait For
2
Replies
36
Views
104K
Erel
  • Locked
  • Article
B4J Tutorial [B4X] Resumable Subs - Sleep / Wait For
2 3 4
Replies
67
Views
99K
Erel
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…