ขอความช่วยเหลือแก้ select เป็น textbox ค้นหาครับ(เงือนไขตามเดิม)

<?php
			  		$arrayNumber = 0;
			  		for($x = 1; $x < 4; $x++) { ?>
			  			<tr id="row<?php echo $x; ?>" class="<?php echo $arrayNumber; ?>">			  				
			  				<td style="margin-left:20px;">
		  					  <div class="form-group">

			  					<select class="form-control" name="productName[]" id="productName<?php echo $x; ?>" onchange="getProductData(<?php echo $x; ?>)" >
			  						<option value="">--- โปรดเลือกยาที่ต้องการ ---</option>
			  						<?php
			  							$productSql = "SELECT * FROM product WHERE active = 1 AND status = 1 AND quantity != 0";
			  							$productData = $connect->query($productSql);

			  							while($row = $productData->fetch_array()) {									 		
			  								echo "<option value='".$row['product_id']."' id='changeProduct".$row['product_id']."'>".$row['product_name']."</option>";
										 	} // /while 

			  						?>
		  						</select>
		  					  </div>			  				</td>
			  				<td style="padding-left:20px;">
			  					<div class="form-group">
			  					<input type="number" name="quantity[]" id="quantity<?php echo $x; ?>" onkeyup="getTotal(<?php echo $x ?>)" autocomplete="off" class="form-control" min="1" />
			  					</div>			  				</td>
			  				<td>

			  					<button class="btn btn-default removeProductRowBtn" type="button" id="removeProductRowBtn" onclick="removeProductRow(<?php echo $x; ?>)"><i class="	glyphicon glyphicon-remove"></i></button>			  				</td>
			  			</tr>
		  			<?php
		  			$arrayNumber++;
			  		} // /for
			  		?>
			  	</tbody>			  	
			  </table>

		
			 
				  <!--/form-group--><!--/col-md-6-->