iOS Question WebView goBack to the original position on last page

[joop]

Hi,how is it possible to actually go back to the original position on last page like safari’s back/forward function.
I read this on this link:

http://stackoverflow.com/questions/24153594/uiwebview-goback-to-the-original-position-on-last-page
They say:
Web view has a scrollView property, scrollView has a contentOffset property that you can get or set.

Is this possible in B4I I didn't find this property in Webview B4i , I need to set and get this offset property
can it be done with NativeObject if yes then how ?

Joop

 

[Erel]

If you find the required Objective C code (that works) then I can help you port it.

 

[joop]

thanks, but i didn't find anything i think , but i found some java script- code

in override url I get the scroll top with :

Dim no As NativeObject = WebView1
Dim offset As Object = no.RunMethod("stringByEvaluatingJavaScriptFromString:",Array("document.body.scrollTop;"))

scroll_top =offset

Then in WebView1_PageFinished I want to set the scroll_top in WebView1_PageFinished with :

This wil not work
Dim no As NativeObject = WebView1
no.RunMethod("stringByEvaluatingJavaScriptFromString:", Array("document.body.scrollTop ='scroll_top';"))

This works
no.RunMethod("stringByEvaluatingJavaScriptFromString:", Array("document.body.scrollTop =800;"))

But how do I get the value off scroll_top in this string ?

 

[joop]

no.RunMethod("stringByEvaluatingJavaScriptFromString:", Array("document.body.scrollTop.value =scroll_top;"))

no not good


no.RunMethod("stringByEvaluatingJavaScriptFromString:", Array("document.getElementById('scrollTop').value ='scroll_top';"))

still not good

 

[joop]

Erel , how can I put a variable in this javascript line ?
I don't have experience with this.

no.RunMethod("stringByEvaluatingJavaScriptFromString:", Array("document.body.scrollTop =800;"))

I want to replace the 800 with a variable name, wich is used by B4I
I tried something but it didn 't work.

 

[Erel]

no.RunMethod($"stringByEvaluatingJavaScriptFromString:", Array("document.body.scrollTop =${SomeVariable};"$))

 

[joop]

weird it gives invalid number off parentheses ,I count four off them

no.RunMethod($"stringByEvaluatingJavaScriptFromString:", Array("document.body.scrollTop =${scroll_top};"$))

 

[Erel]

My code was wrong. It should be:

no.RunMethod("stringByEvaluatingJavaScriptFromString:", Array($"document.body.scrollTop =${SomeVariable};"$))

 

[joop]

It works now, and go back to the original position on last page also.

thanks ,Erel