In OOB applicaitons the RadHtmlPlaceholder displays external pages in a WebBrowser control.
The weBrowser control allows you to communicate with the html content it displays. In your case I'd suggest you to create a function in the html/aspx content you are displaying to indicate that a text input has started or that an input field is focused. Once you handle these events in your web page you'll be able to notify the SL WebBorowser control and implement your custom logic.
You can access the WebBrowser
control through the RadHtmlPlaceholder
property and you can handle the WebBrowser
event to get the web page events notifications. Please have a look at this article
for more information about the WebBrowser
I also attached a sample to get you started. Please have a look at it and let me know if it helps.
the Telerik team
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