Render an outputText and disable a button if the value is non-numeric

I have a JSF page which contains dynamic textboxes to get the inputs from the user.
Only numeric values has to be accepted while submitting the form; else an error message should be displayed on the same page.

My requirement now is, I have javascript to validate the user Input. If the user input is a non-numeric, then the "Submit" button has to be disabled and an error messsage (using <h:outputText>) has to be displayed.
If the user Input is numeric then the error message should be displayed and the button should be enabled. The default values: for button (enabled), error message ( disabled)

I want this to be done on a single javascript call. Please find below the javascript am using. Can someone help me on this?

function sumEntries(idTotalInvestments, idTotalAssetClasses, idTotalAllocation, idAllocationAssetClasses)
{      
 //investment size is not really required, but better to have it rather than using an arbitrary number in the loop
 var investmentSize = document.getElementById(idTotalInvestments).value;
 var assetsize = document.getElementById(idTotalAssetClasses).value;      
 var actualVal=0;
                 
 for(var y=0;y < assetsize; y++)
 {
  for ( var x=0; x < investmentSize; x++)
  {
   var datalist = idAllocationAssetClasses+':'+y+':allocationInvestments:'+x+':amount';
       if(document.getElementById(datalist))
   {
        var userInput = document.getElementById(datalist).value;
    
    if(userInput.length > 0)
    {
     if(userInput.search(/[^\d\s]/) == -1)
     {
      actualVal=actualVal+parseInt(userInput);
      document.getElementById(idNonNumericValidation).style.display='false';
     }
     else
     {
      actualVal = "Error";
      document.getElementById(idNonNumericValidation).style.display='true';
      break;
     }    
    }
          }
   else
   {
    //this break is done to avoid having investment size at asset class level
        break;
   }
  }
  if(actualVal == "Error")
  {
   break;
  }
 }
 document.getElementById(idTotalAllocation).value = actualVal;
}

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