This plugin will check the value of a password field and evaluate the strength of the typed password. This is done by checking for the diversity of character types: numbers, lowercase and uppercase letters and special characters.
To use, call the function on a password field:
$('input[type=password]').password_strength(options);
The options argument is optional. Available values to set:
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container: Element to display the strength text in. If none given, a span would be created immediately after the password field.
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minLength: Minimum password length.
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texts: An array of strength texts for the 5 different levels, to override the default texts.
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onCheck: A callback that gets called after a strength check. Gets the new strength value as a parameter.
jQuery plugin page: http://plugins.jquery.com/project/password_strength
The software is provided AS IS under the terms of the GNU General Public License.