jQuery version compatibility detection

Question

Are there any resources that can test a jQuery script/extension/plugin/whatever for version compatibility issues?

Answer 1

Just wrote a small jQuery plugin to help with version compatibility issues... feel free to improve upon it.

(function($) {
    /**
     * Used for version test cases.
     * 
     * @param {string} left A string containing the version that will become
     *        the left hand operand.
     * @param {string} oper The comparison operator to test against. By
     *        default, the "==" operator will be used.
     * @param {string} right A string containing the version that will
     *        become the right hand operand. By default, the current jQuery
     *        version will be used.
     *        
     * @return {boolean} Returns the evaluation of the expression, either
     *         true or false.
     */
    $.isVersion = function(left, oper, right) {
        if (left) {
            var pre = /pre/i,
                replace = /[^\d]+/g,
                oper = oper || "==",
                right = right || $().jquery,
                l = left.replace(replace, ''),
                r = right.replace(replace, ''),
                l_len = l.length, r_len = r.length,
                l_pre = pre.test(left), r_pre = pre.test(right);

            l = (r_len > l_len ? parseInt(l) * ((r_len - l_len) * 10) : parseInt(l));
            r = (l_len > r_len ? parseInt(r) * ((l_len - r_len) * 10) : parseInt(r));

            switch(oper) {
                case "==": {
                    return (true === (l == r && (l_pre == r_pre)));
                }
                case ">=": {
                    return (true === (l >= r && (!l_pre || l_pre == r_pre)));
                }
                case "<=": {
                    return (true === (l <= r && (!r_pre || r_pre == l_pre)));
                }
                case ">": {
                    return (true === (l > r || (l == r && r_pre)));
                }
                case "<": {
                    return (true === (l < r || (l == r && l_pre)));
                }
            }
        }

        return false;
    }
})(jQuery);

Can be used like so:

$.isVersion("1.4.2"); // returns true, if $().jquery == "1.4.2"
$.isVersion("1.3.2", ">"); // returns true if $().jquery > "1.3.2"
$.isVersion("1.3", ">", "1.2.6"); // returns true
$.isVersion("1.3.2", "<", "1.3.1"); // returns false
$.isVersion("1.4.0", ">=", "1.3.2"); // returns true
$.isVersion("1.4.1", "<=", "1.4.1"); // returns true

Also supports pre-releases (releases are weighed heavier than pre-releases, so that 1.4.0pre < 1.4.0):

$.isVersion("1.4.2", "<=", "1.4.2pre"); // returns false