VB - CefSharp not return values-CodePudding

I can fill a value of a specific field with the code below

nav.EvaluateScriptAsync("document.getElementById('email').value='teste';")

but I can't return the value of this field

Dim placeholder As Task(Of JavascriptResponse) = nav.EvaluateScriptAsync("document.getElementById('email').value")
Task.WaitAll()
MsgBox(placeholder.Result.ToString)

both (placeholder.Result.ToString) and (placeholder.ToString) return "CefSharp.JavascriptResponse"

CodePudding user response：

You can obtain the value from JavascriptResponse.Result property. Check the Success property first, if the script evaluation failed the error will be contained with the Message property.

http://cefsharp.github.io/api/97.1.x/html/Properties_T_CefSharp_JavascriptResponse.htm

CodePudding user response：

I got it that way.

Public Async Function testeAsync() As Task(Of String)

    Dim placeholder2 As JavascriptResponse = Await nav.EvaluateScriptAsync("document.getElementById('email').placeholder")

    If (placeholder2.Success) Then
        MsgBox(placeholder2.Result)
    End If

End Function

But when I do a return in the function and call the function in a struct, how do I call waiting for the async function to complete?

This way the sub prints the result before the asynchronous process ends.

Sub testeResultado()
    Dim returnedTaskTResult As Task(Of String) = testeAsync()
    MsgBox(returnedTaskTResult.ToString)
End Sub