iOS Question How to replace B4A.CallSub in B4i?

[watesoft]

The following code works in B4A, but does not work in B4I,I searched the forum and found that there is no such feature in B4I. I found a method in https://www.b4x.com/android/forum/threads/b4i-addjavascriptinterface.72837/ , but it seems to be different from my needs,I don’t know how to start. Who can help me? thank you very much.

Private Webview1 As WKWebView
Sub Webview1_OverrideUrl (Url As String) As Boolean
    Dim C_UTF8 As StringUtils
    Url=C_UTF8.DecodeUrl(Url,"UTF8")
    If Url.Length >= 8  And  Txt_Verse.Text<>"" Then
        Dim javascript As String
        javascript=$"var bb=document.getElementsByName('B${Txt_Verse.Text}')[0];
                            var kk=bb.style.color;
                            if (kk=="blue")
                            {
                                bb.style.color="red";
                            }
                            else
                            {
                                bb.style.color="blue";
                            }
                           
                            function join(){
                            var bb=document.getElementsByTagName('a');
                            var mm=new Array();
                            for(var i=0;i<bb.length;i++){
                                var kk=document.getElementsByName("B"+(i+1))[0];
                                if(kk.style.color=="red")
                                {
                                    mm.push(i+1);
                                }
                            }
                                return mm.join("/");
                        }
                   B4A.CallSub('GetVarFromWebview_1', true, join());"$
        Webview1.EvaluateJavaScript("Webview1",javascript)
    End If
    Return True
End Sub

Sub GetVarFromWebview_1(WebVar As String)
    Dim Verse() As String
    If WebVar<>Null And WebVar<>""  Then
        Verse=Regex.Split("/",WebVar)
        '.............
        '.............
    End If
End Sub

 

[Erel]

I don't think that B4A.CallSub is needed here. You can run a javascript that will return the string. Check this project: https://www.b4x.com/android/forum/threads/b4x-webview-ckeditor-rich-text-editor.133260/#content

 

[watesoft]

I don't think that B4A.CallSub is needed here. You can run a javascript that will return the string. Check this project: https://www.b4x.com/android/forum/threads/b4x-webview-ckeditor-rich-text-editor.133260/#content

Erel,Thanks for your help.
I copy the sub of RunJavaScript to my project, Line of "Dim sf As Object = WebView1.EvaluateJavaScript(js)" shows error: "Cannot assign void value".
The reason for the error is that I am using WKwebview instead of native webview. Due to the needs of other functions, I cannot use webview. How to solve this problem?

 

[Erel]

The reason for the error is that I am using WKwebview instead of native webview. Due to the needs of other functions, I cannot use webview. How to solve this problem?

Use WebView. The internal WebView is actually WKWebView.

 

[watesoft]

The problem is solved.Remove "B4A.CallSub('GetVarFromWebview_1', true, join())" from javascript string,and put GetVarFromWebview_1 into Sub WV_Main_JSComplete.

Sub WV_Main_JSComplete (Success As Boolean, Tag As Object, Result As String)
    If Success Then
        GetVarFromWebview_1(Result)
    End If
End Sub