# How to use "call Postmessage" and "Whene receives message" with Web viewer? **URL:** \ **Category:** Questions about Thunkable X\ **Created:** [March 20, 2020, 10:29am UTC](https://community.thunkable.com/t/how-to-use-call-postmessage-and-whene-receives-message-with-web-viewer/525168 "2020-03-20T10:29:29Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![henrikhngj5](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/henrikhngj5/32/67710_2.png) [@henrikhngj5](https://community.thunkable.com/u/henrikhngj5)\ **Post date:** [April 9, 2020, 10:55am UTC](https://community.thunkable.com/t/how-to-use-call-postmessage-and-whene-receives-message-with-web-viewer/525168/7 "2020-04-09T10:55:29Z")
I think the question is very valid and simple… What is the intention with the PostMessage functionality, why is it there and what can we do with it? I also miss other functionalities that are often present for webviews. Like can you notify me when the URL is changed? or even let me know what the URL is? I know there is a getURL function, but it simply returns the URL I initially provided. If user navigate to another url, the same URL is returned from my webview, that is not nice. Do not get me wrong, it is nice to have a webview, but we need more and we need examples 🙂 Just my 5 cents… --- _[View the full topic](https://community.thunkable.com/t/how-to-use-call-postmessage-and-whene-receives-message-with-web-viewer/525168)._