Remove spaces in string

Replace multiple occurrences of spaces (\s+) with a single space ' ' with the String.replace method, then trim the remaining from the left and right with the String.trim method.

"       My           name   is    Eddy       ".replace(/\s+/g,' ').trim()

trim is available in FF 3.5+, IE 9+, Safari 9+.

Try this

var str=" My name is Eddy ";
alert(str.trim());

DEMO

Try this code also

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

You can use String.prototype.trim() on modern browsers (see compatibility):

" My name is Eddy ".trim()

will return

"My name is Eddy"

On IE8 you can use the polyfill suggested in the MDN page:

if (!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/gm, '');
  };
}

There are many ways you can do this, but I find it easiest to understand with three individual replacements:

function cleanup( str ) {
    return str
        .replace( / +/g, ' ' )
        .replace( /^ /, '' )
        .replace( / $/, '' );
}

console.log(
    "'" +
    cleanup( "       My           name   is    Eddy       " ) +
    "'"
);

Logs:

'My name is Eddy'

This is compatible with very old browsers as well as new ones.

Edit: So you want to remove all leading spaces, but if there are trailing spaces you want to keep one trailing space, is that right? That's not how you described the problem.

If you look at the cleanup function I posted, it should be apparent how to fix it to not remove trailing spaces:

function cleanup( str ) {
    return str
        .replace( / +/g, ' ' )
        .replace( /^ /, '' );
}

console.log(
    "'" +
    cleanup( "       My           name   is    Eddy       " ) +
    "'"
);

Logs:

'My name is Eddy '