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/**
 * jquery.unique-element-id.js
 *
 * A simple jQuery plugin to get a unique ID for
 * any HTML element
 *
 * Usage:
 *    $('some_element_selector').uid();
 *
 * by Jamie Rumbelow <jamie@jamierumbelow.net>
 * http://jamieonsoftware.com
 * Copyright (c)2011 Jamie Rumbelow
 *
 * Licensed under the MIT license (http://www.opensource.org/licenses/MIT)
 */

(function($){
    /**
     * Generate a new unqiue ID
     */
    function generateUniqueId() {

        // Return a unique ID
        return "nextend-element-" + Math.floor((1 + Math.random()) * 0x10000)
            .toString(16)
            .substring(1);
    }

    /**
     * Get a unique ID for an element, ensuring that the
     * element has an id="" attribute
     */
    $.fn.uid = function(){
        // We need an element! Check the selector returned something
        if (!this.length > 0) {
            return generateUniqueId();
        }

        // Act on only the first element. Also, fetch the element's ID attr
        var first_element = this.first();

        // No? Generate one!
        id_attr = generateUniqueId();

        // And set the ID attribute
        first_element.attr('id', id_attr);

        // Return it
        return id_attr;
    };
})(njQuery);