jQuery - select all text on focus

selectOnFocus.js

function selectOnFocus(input) {
    input.each(function (index, elem) {
        var $elem = $(elem);
        var ignoreNextMouseUp = false;

        $elem.mousedown(function () {
            if (document.activeElement !== elem) {
                ignoreNextMouseUp = true;
            }
        });
        $elem.mouseup(function (ev) {
            if (ignoreNextMouseUp) {
                ev.preventDefault();
                ignoreNextMouseUp = false;
            }
        });
        $elem.focus(function () {
            $elem.select();
        });
    });
}
selectOnFocus($("input:text"));