Paste into Prompt (i.e. how to focus on prompt)? (chrome extension)

Question

I'm trying to build an extension. The first event runs outside of any browser and is triggered by a hotkey. That hotkey triggers a prompt and the result of that prompt is used query a webpage.

By default I'd like the prompt to be populated form the user's clipboard. I have enabled all the appropriate permissions. Is there any way to "focus" on the input box in the prompt window such that "document.execCommand('paste');" will work?

Is there a way to modify the third line of the following javascript to achieve the desired result?

JavaScript

document.getElementById("myButton").addEventListener("click", function(){
    var result = prompt("enter value");
    document.execCommand('paste');
    alert(result);
 });

html

<input type="button" value="clickme" id="myButton">

Answer 1

If you're using document.execCommand , not to mention prompt , that means you're running in a browser environment. So your best bet is to implement a simple overlay + modal dialog in the browser, paste the clipboard contents in an input there, and proceed.

And sadly, you can't "focus" on the clipboard: document.execCommand already uses the clipboard. The input in a prompt isn't part of the DOM, so it won't respond to javascript manipulation. :(