Android Question read value of function return in webview

Tayfur · Aug 22, 2016

I have like web page.(under below).
I loaded Webview this page.
And I want read return value.
How can I read this value?

B4X:

<html>
<script type="text/javascript">
function myFunction(a, b) {
    return a * b;
}
</script>
<body> TEST</body>

I complate ,t, work code extrenal b4A code.So I cant read return value.

B4X:

WebView_ex.executeJavascript(WebView_harita,"myFunction(3,5)")

Tayfur · Aug 22, 2016

Tayfur said:
I have like web page.(under below).
I loaded Webview this page.
And I want read return value.
How can I read this value?

B4X:

<html> <script type="text/javascript"> function myFunction(a, b) { return a * b; } </script> <body> TEST</body>

I complate ,t, work code extrenal b4A code.So I cant read return value.

B4X:

WebView_ex.executeJavascript(WebView_harita,"myFunction(3,5)")

My answer :

B4A loading code:

B4X:

x=File.ReadString(File.DirAssets,"map_data2.txt")
    WebView1.LoadHtml(x)
    WebView_ex.addJavascriptInterface(WebView1, "B4A")

and add new sub

B4X:

Sub MySubName(d As String)
    Log("return>>>"&d)

End Sub

in java file addded

B4X:

<script type="text/javascript">
function myFunction(a, b) {
  //  return a * b;
B4A.CallSub('MySubName', true,a*b)
}
</script>
;

add buton in B4A . and pust it.

B4X:

Sub Button1_Click
    WebView_ex.executeJavascript(WebView1, "myFunction(28,25)")
End Sub

its workssss...

b4x-de · Jul 6, 2025

This can be also done this way:

B4X:

WebView_ex.executeJavascript(WebView1, $"B4A.CallSub('MySubName', true, myFunction(28,25))"$)

and even shorter:

B4X:

WebView_ex.executeJavascript(WebView1, $"B4A.CallSub('MySubName', true, myFunction(28,25))"$)
Wait For MySubName(result AS Int)

Erel · Jul 6, 2025

This is a question from 2016. Better to not to bump it.

Cross platform JavaScript execution: https://www.b4x.com/android/forum/threads/b4x-webview-ckeditor-rich-text-editor.133260/#content

Android Question read value of function return in webview

Tayfur

Well-Known Member

Tayfur

Well-Known Member

b4x-de

Active Member

Erel

B4X founder

Similar Threads

Android Question read value of function return in webview

Tayfur

Well-Known Member

Tayfur

Well-Known Member

b4x-de

Active Member

Erel

B4X founder

Similar Threads

Privacy & Transparency

Privacy & Transparency