Polish postal code - input assist and validation

index.html

<form>
  <input type="text" required class="postalcode" placeholder="Kod pocztowy:" pattern="[0-9]{2}[-][0-9]{3}">
<input type="submit" value="Wyślij">
</form>

Polish-postal-code-input-assist-and-validation.markdown

Polish postal code - input assist and validation

In this Pen i'll show you how to make input form for polish postal code with simple assist and validation.

A Pen by Paweł Mansfeld on CodePen.

License.

script.js

$(document).on('keyup', '.postalcode', function(e){
				var code = $(this).val();
				var key = event.keyCode || event.charCode;
			
				if($(this).val().length == 2){
					 if( key == 8 || key == 46 ){
					 }
					 else{
						$(this).val(code+'-'); 
					 }						
				}
				if($(this).val().indexOf('--') !== -1){
					$(this).val(code.replace('--','-'));					
				}
		});

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

style.css

input{
  padding:8px;
  border:1px solid #aaa;
  border-radius:4px;
  font-size:18px;
}