https://www.poslovnivodic.com/includes/jquery/plugins/jquery.password_strength.js

1(function($){
2var passwordStrength = new function() {
3    this.getStrength = function(pw) {
4        var pwlength=(pw.length);
5        if(pwlength>5)pwlength=5;
6        var numnumeric=pw.replace(/[0-9]/g,"");
7        var numeric=(pw.length-numnumeric.length);
8        if(numeric>3)numeric=3;
9        var symbols=pw.replace(/\W/g,"");
10        var numsymbols=(pw.length-symbols.length);
11        if(numsymbols>3)numsymbols=3;
12        var numupper=pw.replace(/[A-Z]/g,"");
13        var upper=(pw.length-numupper.length);
14        if(upper>3)upper=3;
15        var pwstrength=((pwlength*10)-20)+(numeric*10)+(numsymbols*15)+(upper*10);
16        if(pwstrength<0){pwstrength=0}
17        if(pwstrength>100){pwstrength=100}
18        return pwstrength;
19    }
20
21    this.getStrengthLevel = function(val) {
22        return this.getStrength(val);
23    }
24}
25
26$.fn.password_strength = function(options)
27{
28    var settings = $.extend({
29        'container' : null,
30    }, options);
31
32    return this.each(function(){
33        if (settings.container) {
34            var container = $(settings.container);
35        } else {
36            var container = $('<span/>').attr('class', 'password_strength');
37            $(this).after(container);
38        }
39
40        $(this).focus(function() {
41            container.slideDown();
42        });
43
44        $(this).keyup(function() {
45            var val = $(this).val();
46            if (val.length > 0) {
47                var level = passwordStrength.getStrengthLevel(val);
48            } else {
49                var level = 0
50            }
51            container.children("div").css("background-position", level+"% 50%");
52        });
53    });
54};
55})(jQuery);