How to delete a document if I press escKey while running a script. Please help...

I relay don't know javascript I mostly search and cut an paste what I need. I did need to handle keys for one of my hacks.  To allow only some keys in a dialog fields.   I do not know if code like that would be useful for what you want to do. For there is no dialog active when you want to cancel your script.  You may need to insert some other type of keyboard monitor or code that you can trigger some way that will signal the script to delete the document and terminate.  The Script I have keyboard handler is is my PasteImageRoll script http://www.mouseprints.net/old/dpr/PasteImageRoll.jsx

If you look at my PasteImageRoll  script you will see that all the main code is within a "try catch"  at any point in the main code I can through an error the catch will be triggered and can act on the error code.  In you case the error code would cayse the catch routine to delete the document and end execution perhaps alert the user the his action deleted the document and ended the script execution. 

My PasteImageRoll catch is quite simple

catch(err){

app.preferences.rulerUnits = startRulerUnits; // Restore  the app preferences

if (err=="error1") {alert("Paper width exceeded reduce the cell width");}

else if (err=="error2") {alert("Paper roll length exceeded reduce cell height");}

else if (err=="error3") {alert("No Images Selected");}

else if (err=="error4") {alert("Paper roll length exceeded try selecting fewer images or reducing cell height");}

// Lot's of things can go wrong, Give a generic alert and see if they want the details

else if ( confirm("Sorry, something major happened and I can't continue! Would you like to see more info?" ) ) { alert(err + ': on line ' + err.line ); }

}