Auto Format Date Field (input fields) to dd/mm/yyyy while typing using JavaScript.

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This article will illustrate how to force user enter Date in dd/mm/yyyy format by automatically adding Slashes and allowing only Numbers in the Date Field using JavaScript.

auto slash date format using jquery

index.html:

Here, we created one HTML file. Which is hold HTML and JavaScript code.

<html>
<head>
    <title>Data Auto Slash Format</title>
</head>

<body>    
    
    
    <form id="form" method="post" action="">
      <label for="amount">Date</label>
      <input type="text" id="date" />
      <small>Enter date as Month / Day / Year</small>
    </form>



<script>
var date = document.getElementById('date');

function checkValue(str, max) {
  if (str.charAt(0) !== '0' || str == '00') {
    var num = parseInt(str);
    if (isNaN(num) || num <= 0 || num > max) num = 1;
    str = num > parseInt(max.toString().charAt(0)) 
      && num.toString().length == 1 ? '0' + num : num.toString();
  };
  return str;
};

date.addEventListener('input', function(e) {
  this.type = 'text';
  var input = this.value;
  if (/\D\/$/.test(input)) input = input.substr(0, input.length - 3);
  var values = input.split('/').map(function(v) {
    return v.replace(/\D/g, '')
  });
  if (values[0]) values[0] = checkValue(values[0], 12);
  if (values[1]) values[1] = checkValue(values[1], 31);
  var output = values.map(function(v, i) {
    return v.length == 2 && i < 2 ? v + ' / ' : v;
  });
  this.value = output.join('').substr(0, 14);
});

date.addEventListener('blur', function(e) {
  this.type = 'text';
  var input = this.value;
  var values = input.split('/').map(function(v, i) {
    return v.replace(/\D/g, '')
  });
  var output = '';
  
  if (values.length == 3) {
    var year = values[2].length !== 4 ? parseInt(values[2]) 
    + 2000 : parseInt(values[2]);
    var month = parseInt(values[0]) - 1;
    var day = parseInt(values[1]);
    var d = new Date(year, month, day);
    if (!isNaN(d)) {
      document.getElementById('result').innerText = d.toString();
      var dates = [d.getMonth() + 1, d.getDate(), d.getFullYear()];
      output = dates.map(function(v) {
        v = v.toString();
        return v.length == 1 ? '0' + v : v;
      }).join(' / ');
    };
  };
  this.value = output;
});
</script>
    
    
</body>
</html>
Tags:
Varun Singh

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