Remove some "options" from a option select list Html-javascript

Question

a little help please,

I have this code, I would like to create a javascript function to delete the first three select options (50,55,60) and keep only the last (65) you can help me..... thanks

<select>              
 <option value="50" selected="selected">50</option>
 <option value="55">55</option>
 <option value="60">60</option>
 <option value="65">65</option>
</select>

Answer 1

give the <select> an id , and check the function below:

function filterSelect(){
var selectobject = document.getElementById("select_id"); 
for (var i=0;i<3;i++){
selectobject.remove(0);      
}       
}

filterSelect();

<select id="select_id">              
         <option value="50" selected="selected">50</option>
         <option value="55">55</option>
         <option value="60">60</option>
         <option value="65">65</option>
        </select>