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Resolved Re: To call a powerbuilder event/function from javascript from webbrowser control

  1. How-to
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  1. Sivaprakash BKR
    Sivaprakash BKR
  2. PowerBuilder
  3. Wednesday, 19 October 2022 13:55 PM UTC

Hello,

Using PB 2019 R3 build 2703, Webbrowser control

Need to call a powerbuilder event from a html file with JS function(s).  How to call it?

Tried by going through few videos and codes from Appeon website.

Window consists of a webbrowser (wb_1) which display a login page<html>.  Login page consists of two fields and one button.
Two Fields:  userid & password
Button:       Login 
event :       ue_login

On click of the login button, it calls a js function loginprocess.   Code is given below.

function loginprocess()
{
	alert("login clicked");
	return window.webBrowser.ue_login();
}

In the above code, alert message gets displayed, but the event is not triggered.

Event is registered, in the open event of the window.

wb_1.RegisterEvent ( "ue_login" )

Is this the way to call a pb event from JS? 
If not, can you direct me to any link / document to achieve this?

Happiness Always
BKR Sivaprakash

 

  1. JavaScript
  2. PowerBuilder (Appeon)
  3. WebBrowser
2019 R3 and Spell checking w/Sentry
.NET dll importer generated nvo
Accepted Answer
Sivaprakash BKR
Sivaprakash BKR Accepted Answer Pending Moderation
  1. Thursday, 20 October 2022 06:38 AM UTC
  2. PowerBuilder
  3. # Permalink

Thanks John and Mark,

I started with the code from
https://community.appeon.com/index.php/codeexchange/powerbuilder/273-web-browser-demo-from-elevate-2020

then started modifying it to suit my need.   With your link and suggestion, I found the mistakes that I've done and corrected it. 
1.  JavaScript has to pass a String value to PB event.  I modified
2.  I registered the event in open event of the window.  It was wrong.   I moved it to navigationstart event.

With the above two corrections, it's working now. 

Happiness Always
BKR Sivaprakash

 

Comment
John Fauss
  1. John Fauss
  2. Thursday, 20 October 2022 13:22 PM UTC
That is great news! Thank you for describing what you had to change to resolve the issue. Would you please take a moment and mark this issue as resolved?
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Responses (2)
John Fauss
John Fauss Accepted Answer Pending Moderation
  1. Wednesday, 19 October 2022 16:01 PM UTC
  2. PowerBuilder
  3. # 1

I believe the PB user event MUST accept a single String argument value and return no value, or else the user event will not fire. I struggled with this for a long time until I found an obscure reference somewhere (I cannot recall where I found it documented). Of course, then the JavaScript also has to pass a String value to the registered user event.

It sure would be nice to have this clearly documented in the help for RegisterEvent.

I hope this helps.

Best regards, John

Comment
Mark Goldsmith
  1. Mark Goldsmith
  2. Wednesday, 19 October 2022 16:30 PM UTC
Hi John...agreed, you would think there would be a reference to these details or at least a link in the RegisterEvent Help information. That said, the Help information for this functionality is located under Working with WebBrowser -> Defining user events for WebBrowser (or here on-line: https://docs.appeon.com/pb2022/pbug/Defining_user_events_for_WebBrowser.html). Specifically, around passing arguments and returning values, you are correct on the single string argument but it can also return a string value.

Regards...Mark
  1. Helpful 4
John Fauss
  1. John Fauss
  2. Wednesday, 19 October 2022 17:40 PM UTC
Thank you, Mark, for calling out the obscure hiding place for this information, and for correcting me about the event return value. I appreciate you having my back!
  1. Helpful
Miguel Leeuwe
  1. Miguel Leeuwe
  2. Thursday, 20 October 2022 19:51 PM UTC
That's great!

This link might also be useful if encountering any weird problems: https://www.appeon.com/standardsupport/search/view?id=6338

Regards.
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