How to convert this “PROMPT” code to take input from an “IFRAME/POPUP” instead?

How to convert this "PROMPT" code to take input from an "IFRAME/POPUP" instead?
This is the js code:

u= prompt(" Enter a http:// image path ");
if( u.substring(0,3)=="htt" […]

See original post by invalid@example.com (JEET)

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