What does the following JavaScript code do? 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); } } - JavaScript

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What does the following JavaScript code do?

<html>
<body>

<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>

<input type="text" id="t1" onkeyup="validate()" onkeypress ="validate()"/>

</body>
</html>

The code will cause an error alert to be displayed if a numeric character is entered, and the numeric character is removed.

The code will cause an error alert to be displayed if a non-numeric character is entered, and the non-numeric character is removed.

The code will cause an error alert to be displayed if a numeric character is entered, and the value of textbox is reset.

The code will cause an error alert to be displayed if a non-numeric character is entered, and the value of textbox is reset.

Answer

Correct Answer: The code will cause an error alert to be displayed if a numeric character is entered, and the numeric character is removed.

Explanation:

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