Android Question WebViewExtras: pageDown-Methode

Andie · Jul 6, 2015

Hi, with the help of the WebViewExtras library one is able to scroll down a website, which is displayed in a WebView: (WebViewExtras1 and WebView1 are instances of WebViewExtras und WebView respectively)

B4X:

WebViewExtras1.pageDown(WebView1, true)

This works fine, assuming that the LoadUrl()-method was applied on the WebView. But one can also apply the LoadHtml()-method. For example:

B4X:

WebView1.LoadHtml("<html><body>text ... and much, much more ... text</body></html>")

But using the pageDown()-method then, doesn't show any effect. Has anyone an explanation for it? May be some tag is missing in the html-Text?

eurojam · Jul 6, 2015

I guess, that webview1.loadHtml is an asynchronous task and pageDown will be executed before the page finished loading. one solution is may be to run the pagedown delayed. But I haven't tried this...

Andie · Jul 6, 2015

You are absolutely right and I took care of it by using:

B4X:

WebView1_PageFinished (Url As String)
WebViewExtras1.pageDown(WebView1, true)
End Sub

However, as you see, I left the argument of this PageFinished-event i. e. (Url as String) unchanged, because I don't know what argument I could use instead.

eurojam · Jul 6, 2015

you can try to call it anyway with a delay of let's say 100 ms. it is a workaround...

B4X:

WebView1_PageFinished (Url As String)
delay(100)
WebViewExtras1.pageDown(WebView1, true)
End Sub

where a delay function is described here: https://www.b4x.com/android/forum/threads/a-delay-time-of-function.13177/

Andie · Jul 6, 2015

If think there's no need to work with a delay, because the PageFinished-event works perfectly.
I'm still wondering why in the case of:

B4X:

WebView1.LoadUrl("https://www.b4x.com")

the pageDown-method works fine, while in the case of:

B4X:

WebView1.LoadUrl("file://" & File.DirInternal & "/test.htm")

it does not.

Android Question WebViewExtras: pageDown-Methode

Andie

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eurojam

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Andie

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eurojam

Well-Known Member

Andie

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