[Solved] Jquery Form Validation

You can shorten this as much:

$(document).ready(function() {
  $('#fromDate, #toDate').click(function() {
    $(this).addClass('visited');
  });
});

function apply() {
  var FirstName = $('#name').val();
  $('#name').toggleClass("error", FirstName == "");

  $("#fromDate").toggleClass("error", !$('#fromDate').hasClass('visited'));
  $("#toDate").toggleClass("error", !$('#toDate').hasClass('visited'));

}

Or you can pass this in the function args:

<button class="send" onclick="apply(this)">Send</button>

now in the function:

function apply($this) {
  var $els = $this.siblings('input');
  $els.each(function(){
     $(this).toggleClass("error", $(this).val() == "");
  });
}