Check for blank space as first character and trimming textbox i/p

Hello all,

I have a textbox, in which i have to perform the following validations

1)first character cannot be blank space
2)characters should not exceed 100
3)if exceeded 100, it should trim the i/p to 100 characters

How can i do it?
Please give your valuable suggestions

Thank you all

Sep 24 '10 #1

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15258

RamananKalirajan

608

512MB

Hi Divyanshi,
get the textbox content in a variable and check with the two properties as shown below

Ex:

Expand|Select|Wrap|Line Numbers

    var txt = document.getElementById('textBox').value;

   if(txt.charAt(0)==' '){

     //what should be done for space

   }

   if(txt.length>100){

     //what should be done when the text content is more than 100 char

   }

Thanks and Regards
Ramanan Kalirajan

Sep 24 '10 #2

Dormilich

8,658

Expert Mod 8TB

regarding 2), limit the textbox to 100 chars using the maxlength attribute

Sep 24 '10 #3

Divyanshi

I tried the following

Expand|Select|Wrap|Line Numbers

 function validateDetails()

{

  var TDetails=document.getElementById('<%=txtGDetails.ClientID %>').value;

  if(TDetails=="")

  {

  alert("Please Enter Details");

  document.getElementById('<#=txtGDetails.ClientID').focus();

  return false;

  }

  var count = document.getElementById ('<%=txtGDetails.clientID %>').value.length;

  var txt = document.getElementById('<%=txtGDetails.ClientID %>').value;

  if (count >= 250)

  {

    alert("Details should not exceed 250 characters");

    document.getElementById('<#=txtGDetails.ClientID').focus();

    return false ;

  }

   if (txt.charAt(0)=='')

   {

   alert("First space cannot be blank");

   return false ;

  }    return true ;

   }

It seems not working, still if i give space as first character, it is not giving the message

And also if the character is more than 250, it has to delete the remaining text

Please help to get this done

Thanks

Sep 24 '10 #4

RamananKalirajan

608

512MB

Hi,
For your first problem pls find a working sample below

Expand|Select|Wrap|Line Numbers

 <html>

<head>

<script type="text/javascript">

function checkSpace(){

  var val = document.getElementById('myText').value;

  if(val.charAt(0)==" "){

    alert("I am found")

  }

}

</script>

</head>

<body>

 <input type="text" name="myText" id="myText" value=" " />

<input type="button" value="Check Space" onclick="checkSpace();"/>

</body>

</html>

For your second problem use the substring()

Thanks and Regards
Ramanan Kalirajan

Sep 27 '10 #5

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