CODEWITHSUNDEEP
javascriptjqueryhtml
Om3ga
Om3ga

Reputation: 32853

How to check textfield for whitespaces in jquery

I have a form. I want to put validation so that It will check if user enters white spaces or not. If its white spaces then show error. How could I do this?

Upvotes: 3

Views: 11313

Answers (4)

Anirudh Ramanathan
Anirudh Ramanathan

Reputation: 46728

In case you want to detect if there is any white space all through the user's input string,

var str = $("input").val();
if( str.indexOf(" ") !== -1 )
{
    alert("bad input");
}

Example: http://jsfiddle.net/pYquc/

Upvotes: 10

ManMohan Vyas
ManMohan Vyas

Reputation: 4062

function doValidations(){
   if(jQuery.trim( $(".className").val())==""){
     alert("error message");
     return false;    
   }else{
     return true;
   }
}

<input type="submit" onclick="return doValidations();">

Upvotes: 0

Needhi Agrawal
Needhi Agrawal

Reputation: 1326

Try this usong javascript:
var v = document.form.element.value;
var v1 = v.replace("","");
if( v1.length == 0){
 alert("error");
}

OR you can use following functions:

 // whitespace characters
      var whitespace = " \t\n\r";

      /****************************************************************/

      // Check whether string s is empty.
      function isEmpty(s)
      { return ((s == null) || (s.length == 0)) }

      /****************************************************************/

      function isWhitespace (s)
      {
           var i;

           // Is s empty?
           if (isEmpty(s)) return true;

           // Search through string's characters one by one
           // until we find a non-whitespace character.
           // When we do, return false; if we don't, return true.

           for (i = 0; i < s.length; i++)
           {
                // Check that current character isn't whitespace.
                var c = s.charAt(i);

                if (whitespace.indexOf(c) == -1) return false;
           }

           // All characters are whitespace.
           return true;
      }

Upvotes: 0

Muthu Kumaran
Muthu Kumaran

Reputation: 17910

Use jQuery.trim(str) which remove the whitespace or tabs and you can validate.

http://api.jquery.com/jQuery.trim/

Upvotes: 4

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