Ghost/core/client/assets/lib/jquery-utils.js

// # Ghost jQuery Utils

/*global window, document, $ */

(function () {
    "use strict";

    // UTILS

    /**
     * Allows to check contents of each element exactly
     * @param obj
     * @param index
     * @param meta
     * @param stack
     * @returns {boolean}
     */
    $.expr[":"].containsExact = function (obj, index, meta, stack) {
        return (obj.textContent || obj.innerText || $(obj).text() || "") === meta[3];
    };

    /**
     * Center an element to the window vertically and centrally
     * @returns {*}
     */
    $.fn.center = function () {
        this.css({
            'position': 'fixed',
            'left': '50%',
            'top': '50%'
        });
        this.css({
            'margin-left': -this.outerWidth() / 2 + 'px',
            'margin-top': -this.outerHeight() / 2 + 'px'
        });

        return this;
    };

    $.fn.selectText = function () {
        var elem = this[0],
            range,
            selection;
        if (document.body.createTextRange) {
            range = document.body.createTextRange();
            range.moveToElementText(elem);
            range.select();
        } else if (window.getSelection) {
            selection = window.getSelection();
            range = document.createRange();
            range.selectNodeContents(elem);
            selection.removeAllRanges();
            selection.addRange(range);
        }
    };

}());