/**
 * Convert a single file-input element into a 'multiple' input list
 *
 * Usage:
 *
 *   1. Create a file input element (no name)
 *      eg. <input type="file" id="first_file_element">
 *
 *   2. Create a DIV for the output to be written to
 *      eg. <div id="files_list"></div>
 *
 *   3. Instantiate a MultiSelector object, passing in the DIV and an (optional) maximum number of files
 *      eg. var multi_selector = new MultiSelector( document.getElementById( 'files_list' ), 3 );
 *
 *   4. Add the first element
 *      eg. multi_selector.addElement( document.getElementById( 'first_file_element' ) );
 *
 *   5. That's it.
 *
 *   You might (will) want to play around with the addListRow() method to make the output prettier.
 *
 *   You might also want to change the line 
 *       element.name = 'file_' + this.count;
 *   ...to a naming convention that makes more sense to you.
 * 
 * Licence:
 *   Use this however/wherever you like, just don't blame me if it breaks anything.
 *
 * Credit:
 *   If you're nice, you'll leave this bit:
 *  
 *   Class by Stickman -- http://www.the-stickman.com
 *      with thanks to:
 *      [for Safari fixes]
 *         Luis Torrefranca -- http://www.law.pitt.edu
 *         and
 *         Shawn Parker & John Pennypacker -- http://www.fuzzycoconut.com
 *      [for duplicate name bug]
 *         'neal'
 */
function MultiSelector( list_target, max ){
this.list_target = list_target;
this.count = 0;
this.id = 0;
if( max ){
this.max = max;
} else {
this.max = -1;
};

this.addElement = function( element ){
if( element.tagName == 'INPUT' && element.type == 'file' ){
element.name = 'file_' + this.id++;
element.multi_selector = this;

element.onchange = function(){
var new_element = document.createElement( 'input' );
new_element.type = 'file';
this.parentNode.insertBefore( new_element, this );
this.multi_selector.addElement( new_element );
this.multi_selector.addListRow( this );
this.style.position = 'absolute';
this.style.left = '-1000px';
};
if( this.max != -1 && this.count >= this.max ){
element.disabled = true;
};
this.count++;
this.current_element = element;
} else {
alert( 'Error: not a file input element' );
};
};

this.addListRow = function( element ){
var new_row = document.createElement( 'div' );
new_row.style.fontSize = "12px"
new_row.style.fontFamily = "arial,sans-serif";
new_row.style.lineHeight = "30px";
new_row.innerHTML = '[';
					  
var new_row_button = document.createElement( 'a' );
new_row_button.setAttribute("href", "#");
new_row_button.appendChild(document.createTextNode("Remove"), "/br");
new_row.element = element;
new_row_button.onclick= function(){
this.parentNode.element.parentNode.removeChild( this.parentNode.element );
this.parentNode.parentNode.removeChild( this.parentNode );
this.parentNode.element.multi_selector.count--;
this.parentNode.element.multi_selector.current_element.disabled = false;
return false;
};
var c = element.value.lastIndexOf('\/');
if (c != -1)
html = element.value.substring(c+1);
else {
var c = element.value.lastIndexOf('\\');
if (c != -1)
html = element.value.substring(c+1);
else
html = element.value;
}
new_row.appendChild( new_row_button );
var new_row_text = document.createElement( 'span' );
new_row.appendChild(new_row_text);
new_row_text.innerHTML = '] ' + html;
this.list_target.appendChild( new_row );
};
};