sebastian-software/core

/*
==================================================================================================
  Core - JavaScript Foundation
  Copyright 2010-2012 Zynga Inc.
  Copyright 2012-2014 Sebastian Werner
==================================================================================================
*/

"use strict";

/**
 * Caret query and manipulation API.
 */
core.Module("core.bom.Caret",
{
    /**
     * {Integer} Returns the caret position on the given @element {Element}.
     */
    getPosition : function(element)
    {
        if (document.selection)
        {
            element.focus();
            var sel = document.selection.createRange();
            sel.moveStart('character', -element.value.length);
            return sel.text.length;
        }
        else if (typeof element.selectionStart == "number")
        {
            return element.selectionStart;
        }
    },

    /**
     * Sets the caret @position {Integer} on the given @element {Element}.
     */
    setPosition : function(element, position)
    {
        if (document.selection)
        {
            var range = element.createTextRange();
            range.collapse(true);
            range.moveEnd('character', position);
            range.moveStart('character', position);
            range.select();
        }
        else if (typeof element.selectionStart == "number")
        {
            element.selectionStart = position;
            element.selectionEnd = position;
        }
    }
});