Button to Export to Excel by Copying Field to Clipboard and then Manually Pasting in Excel HELP!!

I have an idea about how to export out of Adobe Reader and I can get it to work by manually copying and pasting but I want to create a button to do it for me.
 
I heard maybe app.execMenuItem("Copy"); may have my answer but I can't get it to work.
 
Basically I have a button that uses javascript to put all the fields on the form into one field separated by Tabs (Tab Delimited). Then I can manually Click on that field and "Select All" and "Copy" and then Paste it right into Excel and it is ready to be imported into my database.
 
I want a button that will manually select everything in that one field (Hidden Field) and Copy it. Then I can go to Excel and Paste it.
 
Some Code for input
 
this.getField("AllData").value= this.getField("A").value + " "+this.getField("B").value + " "+this.getField("C").value ...
 
//Use windows command to Select All, then Copy .
app.execMenuItem("SelectAll").this.getField("AllData").value
app.execMenuItem("Copy").this.getField("AllData").value
 
Not sure how to do that. Please help. I am not an expert at this at all.
Thanks