Password Strength

HTML

<h4>Password Strength</h4>

<img runat="server" id="imgPassLength" alt="length" src="data:image/png;base64,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"
/> - At least 8 characters
<br />

<img runat="server" id="imgPassUpper" alt="8Char"...

JavaScript

function hasNumbers(t) {
  return /\d/.test(t);
}

function hasLowerCase(str) {
  return (/[a-z]/.test(str));
}

function hasUpperCase(str) {
  return (/[A-Z]/.test(str));
}

function hasSpecialChar(str) {
  return (/[~`!#$%\^&*+=\-\[\]\\';,/{}|\\":<>\?]/g.test(str));
}

$('#txtNewPass').on('input', function() {
  var newPass = $('#txtNewPass').val();
  if (newPass.length >= 8) {
    $(imgPassLength).attr('src', 'data:image/png;base64,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');
  } else {
    $(imgPassLength).attr('src',...