Selecting + dragging the contents of a div or textarea

I want to select the contents of a DIV (like highlight when you cl开发者_如何学Goick and drag) when the user clicks on a button. The (hidden) div contains text that needs to be dragged to a 3rd party app outside the browser as input. In other words: I want to simulate the user selecting the contents of a textarea, click and dragging it to another app.

I'm using the PrototypeJS framework, and I came this far:

• put an mousedown observer on the button that needs to be pressed.

I've searched pretty hard already to find a way to select text in an html element, but couldn't find anything. The Prototype API doesn't seem to have a good function that can select the contents of a textarea or an element. It does have Form.Element.select() but that only works on input fields apparently.

Can someone help me out?

Based on the answer I gave yesterday to a similar question, in Prototype you could do it this way:

$('elId').observer('click', function(e){
  var selectTarget = Event.element(e); // Get the element
  if(selectTarget != null) {
     if(selectTarget.tagName == 'TEXTAREA' || (selectTarget.tagName == "INPUT" && selectTarget.type == "text")) {
         selectTarget.select();
     } else if(window.getSelection) { // FF, Safari, Opera
         var sel = window.getSelection();
         var range = document.createRange();
         range.selectNode(selectTarget);
         sel.removeAllRanges();
         sel.addRange(range);
     } else { // IE
         document.selection.empty();
         var range = document.body.createTextRange();
         range.moveToElementText(selectTarget);
         range.select();
     };
  };
});