Как правильно записать значение в value input'а?

var arr=[ 
	{ 
		value: 6, 
		list: [ 
			{ 
				value: 0, 
				text: 'A3' 
			}, 
			{ 
				value: 1, 
				text: 'A4' 
			}, 
			{ 
				value: 2, 
				text: 'A5' 
			} 
		] 
	}, 
	{ 
		value: 7, 
		list: [ 
			{ 
				value: 0, 
				text: 'M3' 
			}, 
			{ 
				value: 1, 
				text: 'M6' 
			}, 
			{ 
				value: 2, 
				text: 'X5' 
			}, 
			{ 
				value: 3, 
				text: 'X6' 
			} 
		] 
	}, 
]; 
 
$("#category").change(function() { 
selval = $(this).val(); 
forval = arr[selval - 6].list; 
  $("#selectmodel").empty(); 
  $.each(forval, function(i, val) { 
  $("#selectmodel").append("<option value='"+val.text+"'>"+val.text+"</option>"); 
})}); 
$("#selectmodel").change(function() { 
text = $(this).val(); 
  $("#xf_model").val(text); 
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
<select id="category"> 
  <option value="6">значение 6</option> 
  <option value="7">значение 7</option> 
</select> 
<select id="selectmodel"> 
</select> 
<input type="text" name="xfield[model]" id="xf_model" value="" rel="essential" data-rel="links" />