<apex:page standardController="Account"> <script src="/soap/ajax/15.0/connection.js" type="text/javascript"></script> <script src="/soap/ajax/15.0/apex.js" type="text/javascript"></script> <script type="text/javascript"> function validateText(){ var numb="{!Account.AccountNumber}"; alert("Test:"+numb); if(isNaN(parseInt(numb))) { alert("Please only enter numeric characters only ! (Allowed input:0-9)"); return false ; } else return true }; </script> } <apex:form > <apex:pageBlock title="edit accounts for{!$User.LastName}"> <apex:pageBlock title="edit accounts for{!$User.Title}"> <apex:pageMessages /> <apex:pageBlockButtons > <apex:commandButton value="Next" action="{!save}" onclick="return validateText();"/> </apex:pageBlockButtons>` <apex:pageBlockSection > <apex:inputField value="{!Account.Site}"/> <apex:inputField value="{!Account.AccountNumber}" /> <apex:inputField value="{!Account.Name}"/> <apex:inputField value="{!Account.NumberOfEmployees}"/> <apex:inputField value="{!Account.Industry}"/> <apex:inputField value="{!Account.Type}"/> </apex:pageBlockSection> </apex:pageBlock> </apex:pageBlock> </apex:form> </apex:page>