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Trim function in Javascript

Posted By:Athira Sreejith       Posted Date: April 07, 2009    Points: 10    Category: Javascript    URL: http://www.dotnetspark.com  
 

 

Trim function in Javascript

function trim(inputString)
 {

    if (typeof inputString != "string")

{

return inputString;

}
    var retValue = inputString;
    var ch = retValue.substring(0, 1);
    while (ch == " ")

{ // Check for spaces at the beginning of the string
       retValue = retValue.substring(1, retValue.length);
       ch = retValue.substring(0, 1);
    }
    ch = retValue.substring(retValue.length-1, retValue.length);
    while (ch == " ")

{

// Check for spaces at the end of the string
       retValue = retValue.substring(0, retValue.length-1);
       ch = retValue.substring(retValue.length-1, retValue.length);
    }
    while (retValue.indexOf("  ") != -1)

 {

 // Note that there are two spaces in the string - look for multiple spaces within the string
       retValue = retValue.substring(0, retValue.indexOf("  ")) + retValue.substring(retValue.indexOf("  ")+1, retValue.length);

 // Again, there are two spaces in each of the strings
    }
    return retValue; // Return the trimmed string back to the user
 } /

Use:

if(trim(frmFeedback("txtName").value)=='')
  {
   alert('Name is blank');
   frmFeedback("txtName").focus();
   return false; 
  }


     

Further Readings:

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