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A Pen By Captain Anonymous

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              <html>
<head>
</head>
<body>
<form id="myForm" method="POST" action="...">
<p>Username: <input id="field_username" title="Username must not be blank and contain only letters, numbers and underscores." type="text" required pattern="\w+" name="username"></p>
<p>Password: <input id="field_pwd1" title="Password must contain at least 6 characters, including UPPER/lowercase and numbers." type="password" required pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,}" name="pwd1"></p>
<p>Confirm Password: <input id="field_pwd2" title="Please enter the same Password as above." type="password" required pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,}" name="pwd2"></p>
<p><input type="submit" value="Submit"></p>
</form>
</body>
</html>
            
          
!
            
                input:required:invalid, input:focus:invalid {
    background-image: url(data:image/png;base64,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);
    background-position: right top;
    background-repeat: no-repeat;
    -moz-box-shadow: none;
  }
  input:required:valid {
    background-image: url(data:image/png;base64,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);
    background-position: right top;
    background-repeat: no-repeat;
  }
            
          
!
            
               document.addEventListener("DOMContentLoaded", function() {

    // JavaScript form validation

    var checkPassword = function(str)
    {
      var re = /^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,}$/;
      return re.test(str);
    };

    var checkForm = function(e)
    {
      if(this.username.value == "") {
        alert("Error: Username cannot be blank!");
        this.username.focus();
        e.preventDefault(); // equivalent to return false
        return;
      }
      re = /^\w+$/;
      if(!re.test(this.username.value)) {
        alert("Error: Username must contain only letters, numbers and underscores!");
        this.username.focus();
        e.preventDefault();
        return;
      }
      if(this.pwd1.value != "" && this.pwd1.value == this.pwd2.value) {
        if(!checkPassword(this.pwd1.value)) {
          alert("The password you have entered is not valid!");
          this.pwd1.focus();
          e.preventDefault();
          return;
        }
      } else {
        alert("Error: Please check that you've entered and confirmed your password!");
        this.pwd1.focus();
        e.preventDefault();
        return;
      }
      alert("Both username and password are VALID!");
    };

    var myForm = document.getElementById("myForm");
    myForm.addEventListener("submit", checkForm, true);

    // HTML5 form validation

    var supports_input_validity = function()
    {
      var i = document.createElement("input");
      return "setCustomValidity" in i;
    }

    if(supports_input_validity()) {
      var usernameInput = document.getElementById("field_username");
      usernameInput.setCustomValidity(usernameInput.title);

      var pwd1Input = document.getElementById("field_pwd1");
      pwd1Input.setCustomValidity(pwd1Input.title);

      var pwd2Input = document.getElementById("field_pwd2");

      // input key handlers

      usernameInput.addEventListener("keyup", function() {
        usernameInput.setCustomValidity(this.validity.patternMismatch ? usernameInput.title : "");
      }, false);

      pwd1Input.addEventListener("keyup", function() {
        this.setCustomValidity(this.validity.patternMismatch ? pwd1Input.title : "");
        if(this.checkValidity()) {
          pwd2Input.pattern = RegExp.escape(this.value);
          pwd2Input.setCustomValidity(pwd2Input.title);
        } else {
          pwd2Input.pattern = this.pattern;
          pwd2Input.setCustomValidity("");
        }
      }, false);

      pwd2Input.addEventListener("keyup", function() {
        this.setCustomValidity(this.validity.patternMismatch ? pwd2Input.title : "");
      }, false);

    }

  }, false);
            
          
!
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