What is the best way to adjust the layout of a card number when entering it?

Question

What is the best way to adjust the layout of a card number when entering it?

Check out the sample I have here:

Here's the HTML code:

<input type="text" name="card_number" id="card_number" class="disbaled_cc required-input valid" maxlength="16" placeholder="xxxx-xxxx-xxxx-xxxx">

And this is the JS code:

function cardFormat(){
    var format_card = $(this).val().replace(/(\d{4})(\d{4})(\d{4})(\d{4})/, "$1-$2-$3-$4");
    if ($(this).val() == '' || $(this).val().match(format_card) || $(this).val().length == 0) {
        console.log("invalid");
    }else{
        console.log("valid");
    }
}

$("#card_number").on('blur change', function () {
        cardFormat();
    });

I'm looking to modify the user input in a specific format like so:

For instance, when the user types this:

1234567891091234 ---> 1234-5678-9109-1234

If the user enters and formats correctly, it should remain as such:

1234-5678-9109-1234 ---> 1234-5678-9109-1234

In this scenario, the issue arises with having 19 characters (max should be 16). How do you suggest we solve this challenge?

If anything is unclear, please let me know for further clarification.

Could you provide feedback on the functionality of my code?

Thank you in advance!

javascript jquery html css

Answer 1

Answer №1

The issue lies with $(this), which is not referring to the intended element, instead it refers to window, and you are failing to assign a new value.

Make the following change:

function formatCard() {
  if ($(this).val().length > 4 && $(this).val().indexOf('-') === -1) {
    var formattedCard = $(this).val().replace(/(\d{4})(\d{4})(\d{4})(\d{4})/, "$1-$2-$3-$4");
    $(this).attr('maxlength', 16);
    $(this).val(formattedCard);
    if ($(this).val() == '' || $(this).val().match(formattedCard) || $(this).val().length == 0) {
      console.log("invalid");
    } else {
      console.log("valid");
    }
  } else {
    $(this).attr('maxlength', 19);
  }
}

$("#card_number").on('input blur', formatCard); //<--use the function as a callback.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="card_number" id="card_number" class="disbaled_cc required-input valid" maxlength="16" placeholder="xxxx-xxxx-xxxx-xxxx">

Alternatively, you can pass the element into the function:

function formatCard($el) { // <---get the element here $el refers to $(this)
  if ($el.val().length > 4 && $el.val().indexOf('-') === -1) {
    var formattedCard = $el.val().replace(/(\d{4})(\d{4})(\d{4})(\d{4})/, "$1-$2-$3-$4");
    $el.attr('maxlength', 16);
    $el.val(formattedCard);
    if ($el.val() == '' || $el.val().match(formattedCard) || $el.val().length == 0) {
      console.log("invalid");
    } else {
      console.log("valid");
    }
  } else {
    $el.attr('maxlength', 19);
  }
}

$("#card_number").on('blur change', function() {
  formatCard($(this)); // <----pass the element here
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="card_number" id="card_number" class="disbaled_cc required-input valid" maxlength="16" placeholder="xxxx-xxxx-xxxx-xxxx">

Answer 2

The issue lies with $(this), which is not referring to the intended element, instead it refers to window, and you are failing to assign a new value.

Make the following change:

function formatCard() {
  if ($(this).val().length > 4 && $(this).val().indexOf('-') === -1) {
    var formattedCard = $(this).val().replace(/(\d{4})(\d{4})(\d{4})(\d{4})/, "$1-$2-$3-$4");
    $(this).attr('maxlength', 16);
    $(this).val(formattedCard);
    if ($(this).val() == '' || $(this).val().match(formattedCard) || $(this).val().length == 0) {
      console.log("invalid");
    } else {
      console.log("valid");
    }
  } else {
    $(this).attr('maxlength', 19);
  }
}

$("#card_number").on('input blur', formatCard); //<--use the function as a callback.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="card_number" id="card_number" class="disbaled_cc required-input valid" maxlength="16" placeholder="xxxx-xxxx-xxxx-xxxx">

Alternatively, you can pass the element into the function:

function formatCard($el) { // <---get the element here $el refers to $(this)
  if ($el.val().length > 4 && $el.val().indexOf('-') === -1) {
    var formattedCard = $el.val().replace(/(\d{4})(\d{4})(\d{4})(\d{4})/, "$1-$2-$3-$4");
    $el.attr('maxlength', 16);
    $el.val(formattedCard);
    if ($el.val() == '' || $el.val().match(formattedCard) || $el.val().length == 0) {
      console.log("invalid");
    } else {
      console.log("valid");
    }
  } else {
    $el.attr('maxlength', 19);
  }
}

$("#card_number").on('blur change', function() {
  formatCard($(this)); // <----pass the element here
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="card_number" id="card_number" class="disbaled_cc required-input valid" maxlength="16" placeholder="xxxx-xxxx-xxxx-xxxx">

Answer 3

Answer №2

Enhanced: Experiment with various characters such as a-Z or numbers to ensure validity. Any spaces and hyphens will be automatically removed.

$('.wrapper').on('input', 'input[name="code"]', formatCode);

function formatCode() {

  var $input = $(this);
  var $check = $input.parent().find('.check');
  
  $input.val($input.val().replace(/ /g, '')); // eliminates all spaces
  $input.val($input.val().replace(/-/g, '')); // deletes all entered dashes
  $input.val($input.val().replace(/(\d{4})(\d{4})(\d{4})(\d{4})/, "$1-$2-$3-$4")); // your validation
  var check = $input.val().match(/-/g) || [];  
  
  if($input.val().length === parseInt($input.attr('maxlength')) && check.length === 3) {
  $check.html("valid");
  return false;
  }
  
  $check.html('invalid'); 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapper">
  <p>
    Our objective: 1111-1111-1111-1111<br>
  </p>
  <input name="code" maxlength="19">
  <span class="check"></span>
</div>

Answer 4

Enhanced: Experiment with various characters such as a-Z or numbers to ensure validity. Any spaces and hyphens will be automatically removed.

$('.wrapper').on('input', 'input[name="code"]', formatCode);

function formatCode() {

  var $input = $(this);
  var $check = $input.parent().find('.check');
  
  $input.val($input.val().replace(/ /g, '')); // eliminates all spaces
  $input.val($input.val().replace(/-/g, '')); // deletes all entered dashes
  $input.val($input.val().replace(/(\d{4})(\d{4})(\d{4})(\d{4})/, "$1-$2-$3-$4")); // your validation
  var check = $input.val().match(/-/g) || [];  
  
  if($input.val().length === parseInt($input.attr('maxlength')) && check.length === 3) {
  $check.html("valid");
  return false;
  }
  
  $check.html('invalid'); 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapper">
  <p>
    Our objective: 1111-1111-1111-1111<br>
  </p>
  <input name="code" maxlength="19">
  <span class="check"></span>
</div>

Answer 5

Answer №3

function formatNumber(value, splitLimit, separator='-') {
  const regExRule = RegExp(String.raw`(.{${splitLimit}})`, 'g')
  const formatted = value.replace(regExRule, `$1${separator && separator}`);
  return formatted
}


console.log( "Formatted number with space 👉 ",
  formatNumber("44771133778855", 5, ' ')
)

console.log("Formatted number with dash 👉 ",
  formatNumber("44771133778855", 4, '-')
)

Answer 6

function formatNumber(value, splitLimit, separator='-') {
  const regExRule = RegExp(String.raw`(.{${splitLimit}})`, 'g')
  const formatted = value.replace(regExRule, `$1${separator && separator}`);
  return formatted
}


console.log( "Formatted number with space 👉 ",
  formatNumber("44771133778855", 5, ' ')
)

console.log("Formatted number with dash 👉 ",
  formatNumber("44771133778855", 4, '-')
)

What is the best way to adjust the layout of a card number when entering it?

Answer №1

Answer №2

Answer №3

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