i want to create user defined function to trim a word in Javascript

how can i trim the word in Javascript.....??开发者_StackOverflow?

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If you can use jQuery, simply use $.trim().

If not, just add a trim method to the String prototype if the browser doesn't support it natively:

if(!String.prototype.trim) {
    String.prototype.trim = function() {
        return this.replace(/^[\s\xA0]+/, '').replace(/[\s\xA0]+$/, '')
    }
}

Then you can use var newstring = somestring.trim();

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If by trim, you mean remove extra whitepace, put this at the top of your script

String.prototype.trim = function() {
   return this.replace(/^\s+|\s+$/g,"");
}

And use it like this

var thestring  = "  hello  ";
alert(thestring.trim());

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You can add the function below // Trim function in javascript

function Trim(str)
{
    while (str.substring(0,1) == ' ') // check for white spaces from beginning
    {
        str = str.substring(1, str.length);
    }
    while (str.substring(str.length-1, str.length) == ' ') // check white space from end
    {
        str = str.substring(0,str.length-1);
    }
    return str;
}

Hope it helped...