Scroll Iframe parent to top

Targets Web
1

Hello,
I have a webpage with an Iframe. In the iframe i am running a Xojo webapp. When pushing a button in the webapp I need to scroll to parent page of the iframe to the top. Usually I would use a JavaScript code like „window.parent.scrollTo(0,0);“ . But how do I do this with Xojo? Of course I tried this code with ExecuteJavascript in the buttons action but that does not work :wink:

2

Both the app and the web app must be on the same server for that to work. Otherwise, you cannot access the parent page.

3

Hello Michel,
thanks for your reply. Both, the webpage end the webapp currently run on localhost. I Xojo I do:

WP_Registration.ExecuteJavaScript("window.parent.scrollTo(0,0);")

I get that error:

Could not execute returned javascript: window.parent.scrollTo is not a function. (In 'window.parent.scrollTo(0,0)', 'window.parent.scrollTo' is undefined) Source: window.parent.scrollTo(0,0);

I think the problem is, that I do not understand how to reference the iframe and the iframes parent from Xojo.

4

http://stackoverflow.com/questions/935127/how-to-access-parent-iframe-from-javascript

5

Hello Michel,
thanks, that was very helpful. I used the example with the „postMessage API“ from your link and it works!