php change textbox value base on drop down list

I have a table name tbl_material:

material | description

1000 | Samsung

2000 | Iphone

i write the code below to get material field into drop down list of HTML

require ("con_config.php");
$select_material_code = "SELECT material, description FROM tbl_material";
$get_material_code = mysqli_query ($con, $select_material_code);
$options_material_Code = "--Select Product--";
$option_material_description = "";
while ($result_material_code = mysqli_fetch_array($get_material_code))
{
    $options_material_Code = $options_material_Code."<option>$result_material_code[1]</option>";
}

Here is HTML

<select name="materialcode_1" id="materialcode_1">
<option value = "<?php echo $options_material_Code;?>"><?php echo $options_material_Code;?></option>
</select>

I have a textbox:

<input type="text" name="description_1" placeholder="Description" maxlength="40" size="40" value="" id="description_1">

I want to get description field from tbl_material if i change drop down list value. how to do it? please help....