how to take either single digit or double digit in textbox

[madhuriks]

hi gud mrng,
in my form....i need to take either single digit in textbox i.e., '1' or '12'..what i did is as follows

login.jsp

<td><font color="#800000" size=""><b>Alert-Msg-Time (in Hrs)</b></font></td>
<td><input type="text" name="alertMsg" maxlength="6"></td>
<td></td>

login.js

if (document.frm.alertMsg.value == "")
  {
       alert("Enter Alert Msg Time");
       document.frm.alertMsg.focus();
       return (false);
   }
   var chkAlrtmsg = /^[0123456789]{2}$/;
   if (chkAlrtmsg.test(document.frm.alertMsg.value))
   {}
   else
   {
       alert('Invalid \" Alert Msg Time \" Entry');
       return false;
   }

here i used regExp for taking 2 digits...but i need is it should take either of them....can anyone help me out...

thanks,
madhu.

[Dormilich]

why did you define a size (textbox) of 6, when you only need one of 2?

PS.

/^\d{1,2}$/

[madhuriks]

hi,
thanks..its working i removed the 'maxlength'...i had another problem with another label..called 'L-Units'....in this txtbox i need to enter 'decimal numbers' as well as it should not take letters nor -ve values...here is my code.

login.jsp

<td></td>
  <td><font color="#800000" size=""><b>L-Units</b>&nbsp;&nbsp;</font></td>
  <td><input type="text" name="localUnits" id="localUnits">&nbsp;&nbsp;&nbsp;&nbsp;</td>
<td></td>

login.js

if (document.frm.localUnits.value == "")
    {
        alert("Enter Local Units");
        document.frm.localUnits.focus();
        return false;
    }
    var chklocalUnits = "0123456789";
    var checklocalUnitsStr = document.frm.localUnits.value;
    var alllocalUnitsValid = true;
    for (i = 0;  i < checklocalUnitsStr.length;  i++)
    {
        ch = checklocalUnitsStr.charAt(i);
        for (j = 0;  j < chklocalUnits.length;  j++)
            if (ch == chklocalUnits.charAt(j))
                break;
        if (j == chklocalUnits.length)
        {
            alllocalUnitsValid = false;
            break;
        }
    }
    if (!alllocalUnitsValid)
    {
        alert("Enter only numeric in the \" Local Units \" field , No -ve's are allowed.");
        document.frm.localUnits.focus();
        return (false);
    }
    var localUnitsValid = document.getElementById('localUnits').value;
    for(var i1 = 0; i1 < localUnitsValid.length; i1++)
    {
        currentCode = localUnitsValid.charCodeAt(i1);
        if(currentCode!=45 && currentCode!=46 && currentCode<48 || currentCode>57)
        {
            alert('Only Numbers are allowed in Local Units Valid');
            return false;
        } 
        if(localUnitsValid.indexOf('.')!=-1 && localUnitsValid.lastIndexOf('.')!=localUnitsValid.indexOf('.')){
            alert('A number can only have one decimal point');
            return false;
        }
    }

wht i wrote in js it is not accepting 'Decimal numbers'...but it is accepting 'No -ve values to be entered and letters not to be entered'....can u suggest where i wnt wrong...

[Dormilich]

what is a "-ve" value?

[madhuriks]

'-ve' means 'negative' value....

[madhuriks]

the txtbox should not take 'negative' values...whts wrng in my code...

[Dormilich]

IMO, too complicated test logic. convert the value into a number (parseFloat()) and test for NaN (not a numerical input) and x < 0.

[madhuriks]

i had deleted some part of js code...here the code is

var stdUnitsValid = document.getElementById('stdUnits').value;
    for(var i2 = 0; i2 < stdUnitsValid.length; i2++)
    {
        currentCode = stdUnitsValid.charCodeAt(i2);
        if(currentCode!=45 && currentCode!=46 && currentCode<48 || currentCode>57)
        {
            alert('Only Numbers are allowed in Local Units Valid');
            return false;
        }
        if(stdUnitsValid.indexOf('.')!=-1 && stdUnitsValid.lastIndexOf('.')!=stdUnitsValid.indexOf('.')){
            alert('A number can only have one decimal point');
            return false;
        }
    }

[Dormilich]

I am still of the opinion, that you think too complicated. convert the input in a number and test, whether it is negative.

[madhuriks]

i tried what u suggested...the problem im facing is if i enter the negative no. it is not showing any alert..i used if condition but not wrkng...hw to check for that..i removed if condition ..my code is

if (document.frm.localUnits.value == "")
    {
        alert("Enter Local Units");
        document.frm.localUnits.focus();
        return false;
    }
    
    var localUnitsValid = document.getElementById('localUnits').value;
    for(var i2 = 0; i2 < localUnitsValid.length; i2++)
    {
        currentCode = localUnitsValid.charCodeAt(i2);
        if(currentCode!=45 && currentCode!=46 && currentCode<48 || currentCode>57)
        {
            alert('Only Numbers are allowed in STD Units Valid');
            return false;
        }
    }
    localUnitsValid = Math.abs(localUnitsValid);
    document.getElementById('localUnits').value = Math.abs(localUnitsValid)

[Dormilich]

i tried what u suggested...

according to your posted code, you did not.

[madhuriks]

sorry for that i used 'Math' function...and i got it...by submitting the form..'negative ' values converts to postive value in my o/p..but i need alert msg...where shld i code..

[madhuriks]

hi,
im getting alert msg...i came to knw where i kept wrng..here is my chngd code..

if (localUnitsValid != Math.abs(localUnitsValid))
            {
                alert('entered -ve value');
                localUnitsValid = Math.abs(localUnitsValid);
                return false;
            }

[Dormilich]

what about if (localUnitsVali d < 0) ?

[madhuriks]

im entering the values in txtbox...if the txt box is left empty..i'll throw an alert...