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My webpage contains a popup in which the user uploads a file.<br />
<br />
I must use some data from the uploaded file to fill in a textbox on the main page.<br />
<br />
How can I access this data?
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My webpage contains a popup in which the user uploads a file.

I must use some data from the uploaded file to fill in a textbox on the main page.

How can I access this data?

transfer data from popup to main window?

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.