Disable spaces in Input, AND allow back arrow?

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You may add keydown handler and prevent default action for space key (i.e. 32):

$("input#UserName").on({
  keydown: function(e) {
    if (e.which === 32)
      return false;
  },
  change: function() {
    this.value = this.value.replace(/\s/g, "");
  }
});

DEMO: http://jsfiddle.net/EJFbt/1/

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