Select others, then show input text in Laravel

Everything works when picking up others, but I get an error when choosing another option. Please help,, i'm newbie in laravel

<select id="position" class="form-control" name="position" onchange='checkvalue(this.value)'>
       <option value="Option A">Gedung A</option>
       <option value="Option B">Option B</option>
       <option value="Option C">Option C</option>
       <option>Other...</option>
</select>

<input type="text" id="other_text" class="form-control" name="position" placeholder="Enter your location" required style='display:none' />

 <script>
    function checkvalue(val)
    {
        if(val==="Other...")
           document.getElementById('other_text').style.display='block';
        else
           document.getElementById('other_text').style.display='none';
    }
 </script>