/***************************************************************************
Copyright (c) 2009, Tom Pimienta
All rights reserved.

Redistribution and use in source and binary forms, with or without 
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, 
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, 
this list of conditions and the following disclaimer in the documentation 
and/or other materials provided with the distribution.
* Neither the name of the Tom Pimienta nor the names of its contributors 
may be used to endorse or promote products derived from this software without 
specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/

/**
 * Update counter widget with number of characters remaining
 * @param string counter id of counter element
 * @param string text_elem id of textarea or input element
 * @param int    max_len maximum allowed character length
 * @return void
 */
function update_counter(counter, text_elem, max_len)
{
    var counterElem = document.getElementById(counter);
    var textElem = document.getElementById(text_elem);
    var len = textElem.value.length;
    var val = max_len - textElem.value.length;
    counterElem.innerHTML = val; 
}

/**
 * Verify that elem_id doesn't contain more than max_len characters
 * @param string elem_id id of elem to count characters in
 * @param int    max_len maxmimum input string (including spaces and returns)
 * @return boolean
 */
function check_content_length(elem_id, max_len)
{
    var elem = document.getElementById(elem_id);
    if(elem.value.length > max_len) {
        return false;
    }
    return true;
}