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JavaScript MCQs

What does the following JavaScript code do? <head id="Head1" runat="server">
  <title></title>
  <script type="text/javascript">
    function validate() {
      var chk = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
      var ok = "yes";
      var temp;
      var field1 = document.getElementById("t1");
      var field = field1.value.substring(field1.value.length - 1, field1.value.length);
      if (chk.indexOf(field) == "-1") {
        alert("error");
        field1.value = (field1.value).slice(0, field1.value.length - 1);
      }
    }
</script>
</head>
<body>
<form id="form1" runat="server">
<input type="text" id="t1" onkeyup="validate()" onkeypress ="validate()"/>
</form>
</body>

The code will cause an error alert to be displayed if a non alphabet character is entered.

The code will cause an error alert to be displayed if ALPHABET character is entered.

The code will cause NO error alert to be displayed if a numeric character is entered.

The code will cause NO error alert to be displayed if a NON ALPHABET character is entered.

Answer

Correct Answer: The code will cause an error alert to be displayed if a non alphabet character is entered.

Explanation:

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