如何在ASP.NET的TextBox输入中添加连字符？

Question

I have an ASP.NET textbox where I want to add a hyphen in the textbox input if the length of the input is > 5. For example, if I type 123456789, the entry should show like this: 12345-6789

How to do this?

<asp:Button ID="Button1" runat="server" Text="Button" />

Answer 1

 $('.phone').on('input', function() { this.value.length < 5 || this.value.charAt(5) == '-' || $(this).val( [this.value.slice(0,5), '-', this.value.slice(5)].join('') ); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <input type="text" name="phone" class="phone"/> 

Answer 2

  var value = $("#your-textbox-id-here").val();

  if (value.length >= 5) {
      value = value.substring(0, 5) + "-" + value.substring(5);
      //console.log(value);
  }