Mixing
CEFSharp bound object lost when new website is loaded
I am using CEFSharp in one of my projects and all works perfectly fine so far.
I am still on V63 of CEFSharp (never touch a running system :-) )
I am using it in VB.NET
The bound object is created after CEFSharp initialisation within Public Sub New() as follows:
CefSharpSettings.LegacyJavascriptBindingEnabled = True
Dim obj As New BoundObject()
obj.browser = browser
browser.RegisterJsObject("bound", obj)
AddHandler browser.LoadingStateChanged, AddressOf obj.Browser_LoadingStateChanged
I am then after each "LoadingStateChanged" event of the browser execute a JS script with browser.ExecuteScriptAsync.....its basically an event listner that will fire the bound object when the event occurs (e.g. a mousclick).
This also so far works 100% OK....the event fires and calls the bound object and passes a variable to my VB.NET code via the bound object.
Now my problem is that after I load a new page the bound object is lost.
The event listner will try to call the bound object but I just get an error like "Uncaught ReferenceError: bound is not defined"
Looks like be loading a new page inside CEFSharp the bound object is lost.
I triead the above initialisation code also with FrameLoadEnd event instead, but it behaves exactly the same as LoadingStateChanged event.
Any clue anyone how I can handle (or renew) the bound object whenever I load a new website?
Thanks
Update:
In the meantime I tried the binding method V2 as recommended.
Using the following code for testing purpose:
'########### TEST CODE TEST CODE TEST CODE ##################
'try to use new binding V2 method by calling CefSharp.BindObjectAsync:
browser.ExecuteScriptAsync("CefSharp.BindObjectAsync(""myObject"");")
'now register object:
browser.JavascriptObjectRepository.Register("myObject", New BoundObject(), True)
'now do test execution of myObject:
browser.ExecuteScriptAsync("myObject(""test"");")
But still struggeling to get it working :-(
cefsharp
asked Sep 30 '18 at 15:00
Oscar DiezOscar Diez
86
|
show 5 more comments
I am using CEFSharp in one of my projects and all works perfectly fine so far.
I am still on V63 of CEFSharp (never touch a running system :-) )
I am using it in VB.NET
The bound object is created after CEFSharp initialisation within Public Sub New() as follows:
CefSharpSettings.LegacyJavascriptBindingEnabled = True
Dim obj As New BoundObject()
obj.browser = browser
browser.RegisterJsObject("bound", obj)
AddHandler browser.LoadingStateChanged, AddressOf obj.Browser_LoadingStateChanged
I am then after each "LoadingStateChanged" event of the browser execute a JS script with browser.ExecuteScriptAsync.....its basically an event listner that will fire the bound object when the event occurs (e.g. a mousclick).
This also so far works 100% OK....the event fires and calls the bound object and passes a variable to my VB.NET code via the bound object.
Now my problem is that after I load a new page the bound object is lost.
The event listner will try to call the bound object but I just get an error like "Uncaught ReferenceError: bound is not defined"
Looks like be loading a new page inside CEFSharp the bound object is lost.
I triead the above initialisation code also with FrameLoadEnd event instead, but it behaves exactly the same as LoadingStateChanged event.
Any clue anyone how I can handle (or renew) the bound object whenever I load a new website?
Thanks
Update:
In the meantime I tried the binding method V2 as recommended.
Using the following code for testing purpose:
'########### TEST CODE TEST CODE TEST CODE ##################
'try to use new binding V2 method by calling CefSharp.BindObjectAsync:
browser.ExecuteScriptAsync("CefSharp.BindObjectAsync(""myObject"");")
'now register object:
browser.JavascriptObjectRepository.Register("myObject", New BoundObject(), True)
'now do test execution of myObject:
browser.ExecuteScriptAsync("myObject(""test"");")
But still struggeling to get it working :-(
cefsharp
asked Sep 30 '18 at 15:00
Oscar DiezOscar Diez
86
cefsharp.github.io/api/67.0.0/html/…
– amaitland
Sep 30 '18 at 21:10
github.com/cefsharp/CefSharp/wiki/…
– amaitland
Sep 30 '18 at 21:10
Thanks @amaitland - the first link makes it very clear that its a feature not a bug :-) However I am struggeling to implement this in VB.NET and convert my current legacy method code into a working new method code. Is there a possibility to provide some of those basic examples in VB.NET? I am struggeling to convert it from C# to VB.NET.
– Oscar Diez
Oct 1 '18 at 17:10
Sorry, I don't have anyVB.Netexamples. I avoid the language where possible.
– amaitland
Oct 1 '18 at 21:57
@amaitland - after reading the documentation at least three times it seems that I was trying the wrong thing. If I understand correctly, now in the new way the binding needs to be initiated in JavaScript on the target website? In case I have no control over that website can I then just inject the Async Function using 'browser.ExecuteScriptAsync' to inject it, as I just do with any other JS?
– Oscar Diez
Oct 3 '18 at 11:23
|
show 5 more comments
I am using CEFSharp in one of my projects and all works perfectly fine so far.
I am still on V63 of CEFSharp (never touch a running system :-) )
I am using it in VB.NET
The bound object is created after CEFSharp initialisation within Public Sub New() as follows:
CefSharpSettings.LegacyJavascriptBindingEnabled = True
Dim obj As New BoundObject()
obj.browser = browser
browser.RegisterJsObject("bound", obj)
AddHandler browser.LoadingStateChanged, AddressOf obj.Browser_LoadingStateChanged
I am then after each "LoadingStateChanged" event of the browser execute a JS script with browser.ExecuteScriptAsync.....its basically an event listner that will fire the bound object when the event occurs (e.g. a mousclick).
This also so far works 100% OK....the event fires and calls the bound object and passes a variable to my VB.NET code via the bound object.
Now my problem is that after I load a new page the bound object is lost.
The event listner will try to call the bound object but I just get an error like "Uncaught ReferenceError: bound is not defined"
Looks like be loading a new page inside CEFSharp the bound object is lost.
I triead the above initialisation code also with FrameLoadEnd event instead, but it behaves exactly the same as LoadingStateChanged event.
Any clue anyone how I can handle (or renew) the bound object whenever I load a new website?
Thanks
Update:
In the meantime I tried the binding method V2 as recommended.
Using the following code for testing purpose:
'########### TEST CODE TEST CODE TEST CODE ##################
'try to use new binding V2 method by calling CefSharp.BindObjectAsync:
browser.ExecuteScriptAsync("CefSharp.BindObjectAsync(""myObject"");")
'now register object:
browser.JavascriptObjectRepository.Register("myObject", New BoundObject(), True)
'now do test execution of myObject:
browser.ExecuteScriptAsync("myObject(""test"");")
But still struggeling to get it working :-(
cefsharp
asked Sep 30 '18 at 15:00
Oscar DiezOscar Diez
86
I am using CEFSharp in one of my projects and all works perfectly fine so far.
I am still on V63 of CEFSharp (never touch a running system :-) )
I am using it in VB.NET
The bound object is created after CEFSharp initialisation within Public Sub New() as follows:
CefSharpSettings.LegacyJavascriptBindingEnabled = True
Dim obj As New BoundObject()
obj.browser = browser
browser.RegisterJsObject("bound", obj)
AddHandler browser.LoadingStateChanged, AddressOf obj.Browser_LoadingStateChanged
I am then after each "LoadingStateChanged" event of the browser execute a JS script with browser.ExecuteScriptAsync.....its basically an event listner that will fire the bound object when the event occurs (e.g. a mousclick).
This also so far works 100% OK....the event fires and calls the bound object and passes a variable to my VB.NET code via the bound object.
Now my problem is that after I load a new page the bound object is lost.
The event listner will try to call the bound object but I just get an error like "Uncaught ReferenceError: bound is not defined"
Looks like be loading a new page inside CEFSharp the bound object is lost.
I triead the above initialisation code also with FrameLoadEnd event instead, but it behaves exactly the same as LoadingStateChanged event.
Any clue anyone how I can handle (or renew) the bound object whenever I load a new website?
Thanks
Update:
In the meantime I tried the binding method V2 as recommended.
Using the following code for testing purpose:
'########### TEST CODE TEST CODE TEST CODE ##################
'try to use new binding V2 method by calling CefSharp.BindObjectAsync:
browser.ExecuteScriptAsync("CefSharp.BindObjectAsync(""myObject"");")
'now register object:
browser.JavascriptObjectRepository.Register("myObject", New BoundObject(), True)
'now do test execution of myObject:
browser.ExecuteScriptAsync("myObject(""test"");")
But still struggeling to get it working :-(
cefsharp
cefsharp
asked Sep 30 '18 at 15:00
Oscar DiezOscar Diez
86
asked Sep 30 '18 at 15:00
Oscar DiezOscar Diez
86
edited Nov 21 '18 at 23:33
Oscar Diez
asked Sep 30 '18 at 15:00
Oscar DiezOscar Diez
86
asked Sep 30 '18 at 15:00
Oscar DiezOscar Diez
86
asked Sep 30 '18 at 15:00
Oscar DiezOscar Diez
86
86
cefsharp.github.io/api/67.0.0/html/…
– amaitland
Sep 30 '18 at 21:10
github.com/cefsharp/CefSharp/wiki/…
– amaitland
Sep 30 '18 at 21:10
Thanks @amaitland - the first link makes it very clear that its a feature not a bug :-) However I am struggeling to implement this in VB.NET and convert my current legacy method code into a working new method code. Is there a possibility to provide some of those basic examples in VB.NET? I am struggeling to convert it from C# to VB.NET.
– Oscar Diez
Oct 1 '18 at 17:10
Sorry, I don't have anyVB.Netexamples. I avoid the language where possible.
– amaitland
Oct 1 '18 at 21:57
@amaitland - after reading the documentation at least three times it seems that I was trying the wrong thing. If I understand correctly, now in the new way the binding needs to be initiated in JavaScript on the target website? In case I have no control over that website can I then just inject the Async Function using 'browser.ExecuteScriptAsync' to inject it, as I just do with any other JS?
– Oscar Diez
Oct 3 '18 at 11:23
|
show 5 more comments
cefsharp.github.io/api/67.0.0/html/…
– amaitland
Sep 30 '18 at 21:10
github.com/cefsharp/CefSharp/wiki/…
– amaitland
Sep 30 '18 at 21:10
Thanks @amaitland - the first link makes it very clear that its a feature not a bug :-) However I am struggeling to implement this in VB.NET and convert my current legacy method code into a working new method code. Is there a possibility to provide some of those basic examples in VB.NET? I am struggeling to convert it from C# to VB.NET.
– Oscar Diez
Oct 1 '18 at 17:10
Sorry, I don't have anyVB.Netexamples. I avoid the language where possible.
– amaitland
Oct 1 '18 at 21:57
@amaitland - after reading the documentation at least three times it seems that I was trying the wrong thing. If I understand correctly, now in the new way the binding needs to be initiated in JavaScript on the target website? In case I have no control over that website can I then just inject the Async Function using 'browser.ExecuteScriptAsync' to inject it, as I just do with any other JS?
– Oscar Diez
Oct 3 '18 at 11:23
cefsharp.github.io/api/67.0.0/html/…
– amaitland
Sep 30 '18 at 21:10
cefsharp.github.io/api/67.0.0/html/…
– amaitland
Sep 30 '18 at 21:10
github.com/cefsharp/CefSharp/wiki/…
– amaitland
Sep 30 '18 at 21:10
github.com/cefsharp/CefSharp/wiki/…
– amaitland
Sep 30 '18 at 21:10
Thanks @amaitland - the first link makes it very clear that its a feature not a bug :-) However I am struggeling to implement this in VB.NET and convert my current legacy method code into a working new method code. Is there a possibility to provide some of those basic examples in VB.NET? I am struggeling to convert it from C# to VB.NET.
– Oscar Diez
Oct 1 '18 at 17:10
Thanks @amaitland - the first link makes it very clear that its a feature not a bug :-) However I am struggeling to implement this in VB.NET and convert my current legacy method code into a working new method code. Is there a possibility to provide some of those basic examples in VB.NET? I am struggeling to convert it from C# to VB.NET.
– Oscar Diez
Oct 1 '18 at 17:10
Sorry, I don't have any
VB.Net examples. I avoid the language where possible.– amaitland
Oct 1 '18 at 21:57
Sorry, I don't have any
VB.Net examples. I avoid the language where possible.– amaitland
Oct 1 '18 at 21:57
@amaitland - after reading the documentation at least three times it seems that I was trying the wrong thing. If I understand correctly, now in the new way the binding needs to be initiated in JavaScript on the target website? In case I have no control over that website can I then just inject the Async Function using 'browser.ExecuteScriptAsync' to inject it, as I just do with any other JS?
– Oscar Diez
Oct 3 '18 at 11:23
@amaitland - after reading the documentation at least three times it seems that I was trying the wrong thing. If I understand correctly, now in the new way the binding needs to be initiated in JavaScript on the target website? In case I have no control over that website can I then just inject the Async Function using 'browser.ExecuteScriptAsync' to inject it, as I just do with any other JS?
– Oscar Diez
Oct 3 '18 at 11:23
|
show 5 more comments
1 Answer
1
active
oldest
votes
The last sugestion of amaitland solved the problem. it works now nicely across various sites. In principle I just replaced this two lines in my original working code:
Dim obj As New BoundObject()
obj.browser = browser
'browser.RegisterJsObject("bound", obj) 'replaced by next line (JS binding V2)
browser.JavascriptObjectRepository.Register("bound", obj, True, Nothing)
AddHandler browser.LoadingStateChanged, AddressOf obj.Browser_LoadingStateChanged
And then later within the Sub that handles the browser_LoadingStateChangedAsync event I just added this line beofre any other injected JS:
'use new binding V2 method by calling CefSharp.BindObjectAsync:
browser.ExecuteScriptAsync("CefSharp.BindObjectAsync(""bound"");")
I hope this helps others using CEFsharpin VB.NET if they come across the same problem.
answered Nov 24 '18 at 16:06
Oscar DiezOscar Diez
86
The official documentation is at github.com/cefsharp/CefSharp/wiki/…
– amaitland
Nov 24 '18 at 23:10
add a comment |
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The last sugestion of amaitland solved the problem. it works now nicely across various sites. In principle I just replaced this two lines in my original working code:
Dim obj As New BoundObject()
obj.browser = browser
'browser.RegisterJsObject("bound", obj) 'replaced by next line (JS binding V2)
browser.JavascriptObjectRepository.Register("bound", obj, True, Nothing)
AddHandler browser.LoadingStateChanged, AddressOf obj.Browser_LoadingStateChanged
And then later within the Sub that handles the browser_LoadingStateChangedAsync event I just added this line beofre any other injected JS:
'use new binding V2 method by calling CefSharp.BindObjectAsync:
browser.ExecuteScriptAsync("CefSharp.BindObjectAsync(""bound"");")
I hope this helps others using CEFsharpin VB.NET if they come across the same problem.
answered Nov 24 '18 at 16:06
Oscar DiezOscar Diez
86
The official documentation is at github.com/cefsharp/CefSharp/wiki/…
– amaitland
Nov 24 '18 at 23:10
add a comment |
The last sugestion of amaitland solved the problem. it works now nicely across various sites. In principle I just replaced this two lines in my original working code:
Dim obj As New BoundObject()
obj.browser = browser
'browser.RegisterJsObject("bound", obj) 'replaced by next line (JS binding V2)
browser.JavascriptObjectRepository.Register("bound", obj, True, Nothing)
AddHandler browser.LoadingStateChanged, AddressOf obj.Browser_LoadingStateChanged
And then later within the Sub that handles the browser_LoadingStateChangedAsync event I just added this line beofre any other injected JS:
'use new binding V2 method by calling CefSharp.BindObjectAsync:
browser.ExecuteScriptAsync("CefSharp.BindObjectAsync(""bound"");")
I hope this helps others using CEFsharpin VB.NET if they come across the same problem.
answered Nov 24 '18 at 16:06
Oscar DiezOscar Diez
86
The official documentation is at github.com/cefsharp/CefSharp/wiki/…
– amaitland
Nov 24 '18 at 23:10
add a comment |
The last sugestion of amaitland solved the problem. it works now nicely across various sites. In principle I just replaced this two lines in my original working code:
Dim obj As New BoundObject()
obj.browser = browser
'browser.RegisterJsObject("bound", obj) 'replaced by next line (JS binding V2)
browser.JavascriptObjectRepository.Register("bound", obj, True, Nothing)
AddHandler browser.LoadingStateChanged, AddressOf obj.Browser_LoadingStateChanged
And then later within the Sub that handles the browser_LoadingStateChangedAsync event I just added this line beofre any other injected JS:
'use new binding V2 method by calling CefSharp.BindObjectAsync:
browser.ExecuteScriptAsync("CefSharp.BindObjectAsync(""bound"");")
I hope this helps others using CEFsharpin VB.NET if they come across the same problem.
answered Nov 24 '18 at 16:06
Oscar DiezOscar Diez
86
The last sugestion of amaitland solved the problem. it works now nicely across various sites. In principle I just replaced this two lines in my original working code:
Dim obj As New BoundObject()
obj.browser = browser
'browser.RegisterJsObject("bound", obj) 'replaced by next line (JS binding V2)
browser.JavascriptObjectRepository.Register("bound", obj, True, Nothing)
AddHandler browser.LoadingStateChanged, AddressOf obj.Browser_LoadingStateChanged
And then later within the Sub that handles the browser_LoadingStateChangedAsync event I just added this line beofre any other injected JS:
'use new binding V2 method by calling CefSharp.BindObjectAsync:
browser.ExecuteScriptAsync("CefSharp.BindObjectAsync(""bound"");")
I hope this helps others using CEFsharpin VB.NET if they come across the same problem.
answered Nov 24 '18 at 16:06
Oscar DiezOscar Diez
86
answered Nov 24 '18 at 16:06
Oscar DiezOscar Diez
86
answered Nov 24 '18 at 16:06
Oscar DiezOscar Diez
86
answered Nov 24 '18 at 16:06
Oscar DiezOscar Diez
86
86
The official documentation is at github.com/cefsharp/CefSharp/wiki/…
– amaitland
Nov 24 '18 at 23:10
add a comment |
The official documentation is at github.com/cefsharp/CefSharp/wiki/…
– amaitland
Nov 24 '18 at 23:10
The official documentation is at github.com/cefsharp/CefSharp/wiki/…
– amaitland
Nov 24 '18 at 23:10
The official documentation is at github.com/cefsharp/CefSharp/wiki/…
– amaitland
Nov 24 '18 at 23:10
add a comment |
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cefsharp.github.io/api/67.0.0/html/…
– amaitland
Sep 30 '18 at 21:10
github.com/cefsharp/CefSharp/wiki/…
– amaitland
Sep 30 '18 at 21:10
Thanks @amaitland - the first link makes it very clear that its a feature not a bug :-) However I am struggeling to implement this in VB.NET and convert my current legacy method code into a working new method code. Is there a possibility to provide some of those basic examples in VB.NET? I am struggeling to convert it from C# to VB.NET.
– Oscar Diez
Oct 1 '18 at 17:10
Sorry, I don't have any
VB.Netexamples. I avoid the language where possible.– amaitland
Oct 1 '18 at 21:57
@amaitland - after reading the documentation at least three times it seems that I was trying the wrong thing. If I understand correctly, now in the new way the binding needs to be initiated in JavaScript on the target website? In case I have no control over that website can I then just inject the Async Function using 'browser.ExecuteScriptAsync' to inject it, as I just do with any other JS?
– Oscar Diez
Oct 3 '18 at 11:23