javascript - How to auto format textbox inputs

Question

<tr>
   <td><label>Birthdate</label>
      <input type="text" placeholder="mm/dd/yyyy" name="birthdate" maxlength="10"/>
   </td>
</tr>

Well, my code is working but I want my "input type text" to auto format like a date (html 5 input type=date) because in my Servlet I convert it to Age. The problem is that, if I use the "input type=date" the conversion is error so I decided to use "input type=text" and it's working. So is it possible to auto put "/" in this format "mm/dd/yyyy"? For example, if the user input 2 character an "/" will auto input etc.

---

Servlet for birthdate to Age

        String birthdate = request.getParameter("birthdate");


        int monthDOB = Integer.parseInt(birthdate.substring(0, 2));
        int dayDOB = Integer.parseInt(birthdate.substring(3, 5));
        int yearDOB = Integer.parseInt(birthdate.substring(6, 10));

        DateFormat dateFormat = new SimpleDateFormat("MM");
        java.util.Date date = new java.util.Date();
        int thisMonth = Integer.parseInt(dateFormat.format(date));

        dateFormat = new SimpleDateFormat("dd");
        date = new java.util.Date();
        int thisDay = Integer.parseInt(dateFormat.format(date));

        dateFormat = new SimpleDateFormat("YYYY");
        date = new java.util.Date();
        int thisYear = Integer.parseInt(dateFormat.format(date));

        int calAge = thisYear - yearDOB;

        if (thisMonth < monthDOB) {
            calAge = calAge - 1; 
        }

        if (thisMonth == monthDOB && thisDay < dayDOB) {
            calAge = calAge - 1;
        }

        String age = Integer.toString(calAge);

---

Update in the form

<tr>
    <td><label for="inputName">Birthdate</label>
       <input type="text" placeholder="mm/dd/yyyy" id="input_date" name="birthdate" maxlength="10"  />
    </td>
</tr>

Update in the source

<script src="../scripts/formatter.js"></script>
<script src="../scripts/formatter.min.js"></script>
<script src="../scripts/jquery.formatter.js"></script>
<script src="../scripts/jquery.formatter.min.js"></script>

Added Script

<script>
     $('#input_date').formatter({
       'pattern': '{{99}}/{{99}}/{{9999}}',
       'persistent': true
     });
</script>

I also tried the javascript but it's not working...

Answer 1

I've been watching a project on GitHub (and providing feedback to improve it) for just such kind of formatting called formatter.js http://firstopinion.github.io/formatter.js/demos.html This might be just the thing you're looking for.

This wouldn't stop you from typing in dates like the 53rd of May... but it will help you format.

new Formatter(document.getElementById('date-input'), {
  'pattern': '{{99}}/{{99}}/{{9999}}',
  'persistent': true
});

or

$('#date-input').formatter({
  'pattern': '{{99}}/{{99}}/{{9999}}',
  'persistent': true
});