client side verification using javascript textbox

Question

I have the following Javascript code. It prevents the textbox from being empty, but I also need it to prevent numbers from being entered (I don't know how to add that)

if (document.getElementById('firstname').value=="") {
    errormessage+="Enter your first name \n";
    document.getElementById('firstname').style.borderColor="red";
} else {
    document.getElementById('firstname').style.borderColor="green";     
}

Possible duplicate of How can we get a javascript program to prevent numeric input? — Sudsy
– Sudsy, Commented Jun 17, 2016 at 3:15

Jack jdeoel · Accepted Answer · 2016-06-17 03:53:29Z

0

check the number input by regexp type /[0-9]/ with test function .That will return true when any 0 from 9 is exist.

var val = document.getElementById('firstname').value;
if (val =="" || /[0-9]/.test(val) == true){
 // error show
}
else{

}

answered Jun 17, 2016 at 3:53

Jack jdeoel

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