custom jquery expr and fn extend functions

01-jquery.tripuls.functions.js

/**
 * Created by m.schultheiss on 16.11.2015.
 */
    // Add this code anywhere you want (after jQuery has been loaded).
    // Edit it to add your own expressions.

(function ($) {
    'use strict';
    function containsI(elem, text) {
        return (
                   elem.textContent ||
                   elem.innerText ||
                   $(elem).text() ||
                   ""
               ).toLowerCase().indexOf((text || "").toLowerCase()) > -1;
    }

    // @see https://api.jquery.com/jquery.extend/
    // @see http://viralpatel.net/blogs/jquery-get-text-element-without-child-element/
    $.extend($.fn, {
        hasAttr: function (name) {
            return (typeof this.attr(name) !== "undefined" && this.attr(name) !== false);
        },
        justText: function (justNumber) {
            this.t = $(this).clone()
                .children().remove()
                .end().text().trim();
            return justNumber ? this.t.replace(/[^0-9]/gi, "") : this.t;
        }
    });
    $.extend($.expr[':'], {
        ///////////////////////////////////////////////////////////
        // form elements that are submitable based on these criteria
        //    element is not disabled
        //    element has a selected or checked attribute
        //    element is a textarea
        //    element is an input of type text or hidden
        //
        //  @usage: $(':submitable')
        //  @usage: $('#myForm :submitable')
        'submitable': function (a) {
            return !a.disabled && (a.selected || a.checked || (a.nodeName.toUpperCase() == 'TEXTAREA') ||
                                   (a.nodeName.toUpperCase() == 'INPUT' && (a.type == 'text' || a.type == 'hidden' || a.type == 'password')));
        },
        ///////////////////////////////////////////////////////////
        // elements that have a type attribute not equal to hidden
        //    use if you want to select all input elements that are not hidden
        //  @usage: $('input:nothidden')
        'notHidden': function (a) {
            return a.type && a.type != 'hidden';
        },

        //
        'containsNC': function (elem, i, match) {
            return (elem.textContent ||
                    elem.innerText ||
                    $(elem).text() ||
                    "").toUpperCase().indexOf((match[3] || "").toUpperCase()) >= 0;
        },

        // An implementation of a case-insensitive contains pseudo
        // made for all versions of jQuery
        'containsI': function (elem, i, match) {
            return containsI(elem, match[3]);
        }
    });

})(jQuery);