CODEWITHSUNDEEP
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Sophia111
Sophia111

Reputation: 167

Check if input is only alphabets in javascript using IF ELSE statement

I have an input field for which I need to make sure the input is only and only characters from the alphabet, with no:

I want to do this using if else statement only. So far the code is:

HTML: 

<form id="myform"  onsubmit="return check();" >
    <input class="input" type="text" name="firstname">

And JavaScript is:

function check() {
    var x = document.forms["myform"]["firstname"].value;
    if (x == null || x == ""){
        myform.action="firstnameerror.html";}
    if (isNaN(x)) {
        myform.action="lastname.html";     
    } else { 
        myform.action="firstnameerror1.html"
    }
}

Upvotes: 1

Views: 4284

Answers (1)

Jonathan Lam
Jonathan Lam

Reputation: 17351

You can check it using regular expressions (RegExp), specifically with the .test() function:

if(/[^a-zA-Z]/.test(x))
    // code to throw error

This will run the code to throw an error if any non-alphabetic character is contained in x.

Upvotes: 4

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