B4J Question Javascript Engine returns error in "Build Standalone Package"

Edgardo PuntoCom · Sep 19, 2020

This code is for autologing in web site

B4X:

Sub recarga_Tick
    Try
    we1.InitializeNewInstance("javafx.scene.web.WebEngine",Null)
    doc1.InitializeStatic("org.w3c.dom.Document")
    temp1 = wv1
    we1 = temp1.RunMethod("getEngine",Null)
    we1.RunMethod("load",Array As Object(startPage1))
    recarga.Enabled = False
    Catch
        Log(LastException)
    End Try
End Sub

Sub wv1_PageFinished (Url As String)
    Try
        js1.enginePut("doc",we1.RunMethod("getDocument",Null))''Returns error in "Build Standalone Package"
        js1.evalString("var t = doc.body.innerHTML;")
        js1.evalString("doc.getElementById('LoginPh').value = 'user';")
        js1.evalString("doc.getElementById('PasswordPh').value = 'password';")
        js1.evalString("doc.getElementById('btnlogin').click();")
        js1.evalString("doc.getElementById('CORRUGATORLINEUPDRYEND').click();")
        js1.evalString("var tt = doc.getElementsByTagName('frame')[0].contentWindow.getElementsByTagName('frame')[0].contentWindow;")


        'get font code of web site
        codigo = js1.engineGet("t")

but, the line

B4X:

 js1.enginePut("doc",we1.RunMethod("getDocument",Null))''Returns error in "Build Standalone Package"

Return this error:

when I run the jar file it works perfectly, but the exe returns that error

Erel · Sep 20, 2020

Are you using Java 11 or 14? Try it with 11.

Edgardo PuntoCom · Sep 20, 2020

Erel said:
Are you using Java 11 or 14? Try it with 11.

I was with 14. But with 11 it doesn't work either.

Erel · Sep 21, 2020

I'm afraid that there isn't enough information in the error message to say anything.

As a general rule, the less you use WebView the better. Why don't you make the log-in with OkHttpUtils2?

bdunkleysmith · Sep 21, 2020

Not sure if it's relevant to this error, but I presume you have taken note of point 2. in Tips and special cases

2. If using WebView add:

B4X:

#PackagerProperty: IncludedModules = javafx.web

Edgardo PuntoCom · Sep 21, 2020

bdunkleysmith said:
Not sure if it's relevant to this error, but I presume you have taken note of point 2. in Tips and special cases

2. If using WebView add:

B4X:

#PackagerProperty: IncludedModules = javafx.web

That too I have added

Erel said:
I'm afraid that there isn't enough information in the error message to say anything.

As a general rule, the less you use WebView the better. Why don't you make the log-in with OkHttpUtils2?

I have never done it with OkHttpUtils2. But I can try.

Is there an example of how to do it and get the source code of the website?

DonManfred · Sep 21, 2020

Edgardo PuntoCom said:
Is there an example of how to do it and get the source code of the website?

B4X:

Dim j As HttpJob
j.Initialize("", Me)
j.Download("https://www.google.com")
Wait For (j) JobDone(j As HttpJob)
If j.Success Then
   Log(j.GetString)
End If
j.Release

Edgardo PuntoCom · Sep 21, 2020

DonManfred said:

B4X:

Dim j As HttpJob
j.Initialize("", Me)
j.Download("https://www.google.com")
Wait For (j) JobDone(j As HttpJob)
If j.Success Then
   Log(j.GetString)
End If
j.Release

Thank you. Perfect for downloading the source code. But, how is the log-in?

Erel · Sep 22, 2020

It depends on what you are trying to do. If you want to show a web page then OkHttpUtils2 will be less useful. If you just want to log in and then connect to an API for example then it will be useful.

Edgardo PuntoCom · Sep 22, 2020

I use the WebView because I need to navigate the website and take the code in several screens, with WebView it is easier for me since I don't know how to use okhttputils2.

I think I will fix it better using Visual Studio

bdunkleysmith · Sep 22, 2020

There is no doubt in my mind that a solution is possible using B4J, but if you prefer to use Visual Studio I'm sure all here will wish you success.

But if you want to find a solution with B4, I feel you need to explain "what you are trying to do" as per the comment of @Erel above. My experience with B4J has been that the community here will always assist to find a solution with the best assistance coming when one explains the objective clearly. Just providing a small piece of code which doesn't achieve the desired outcome is generally not sufficient.

The community here helped me with a similar problem when I was trying to "screen scrape" some website data, but that required me to explain my objective and indicate the URL of the website concerned.

So perhaps you could describe what the code needs to do and the target URL, and let's see if we can help.

B4J Question Javascript Engine returns error in "Build Standalone Package"

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