php - How not to send empty input value in GET-query

Solution:

you can disable empty fields so they don't get added as data

$('form').submit(function(e){
    var emptyinputs = $(this).find('input').filter(function(){
        return !$.trim(this.value).length;  // get all empty fields
    }).prop('disabled',true);    
});
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Solution:

in php you can do like this

if(!isset($_GET['order_by']) || !$_GET['order_by'])
    return 'error msg';
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or

if(empty($_GET['order_by']))
    return 'error msg';
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change html like this

   <form action="index.php" onsubmit="return valid()">
  <input type="hidden" name="id" value="1">
  <input type="hidden" name="order_by" id="order_by" value="">
  <button type="submit">Submit</button>
  </form>
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javascript:

  function valid(){
   if(!$('#order_by').val()){
       alert("Order by not found");
       return false;
    }
   return true;
 }
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Solution:

$('form#formID').submit(function(e){
     var emptyinputs = $(this).find('select').filter(function(){
     return !$.trim(this.value).length;  
    }).prop('disabled',true);    

     var emptyinputs = $(this).find('input').filter(function(){
     return !$.trim(this.value).length;  
    }).prop('disabled',true);    
});
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You can disable empty fields (both select and input) so they don't get added as data, and for a custom form id.