Remove values from select list based on condition

The index I will change as soon as it removes the 1st element. This code will remove values 52-140 from wifi channel combo box

obj = document.getElementById("id");
if (obj)
{
        var l = obj.length;
        for (var i=0; i < l; i++)
        {
            var channel = obj.options[i].value;

            if ( channel >= 52 &&  channel <= 140 )
            {
                obj.remove(i);
                i--;//after remove the length will decrease by 1 
            }
        }
    }

with pure javascript

var condition = true; // your condition
if(condition) {
    var theSelect = document.getElementById('val');
    var options = theSelect.getElementsByTagName('OPTION');
    for(var i=0; i<options.length; i++) {
        if(options[i].innerHTML == 'Apple' || options[i].innerHTML == 'Cars') {
            theSelect.removeChild(options[i]);
            i--; // options have now less element, then decrease i
        }
    }
}

not tested with IE (if someone can confirm it...)

Give an id for the select object like this:

<select id="mySelect" name="val" size="1" >
    <option value="A">Apple</option>
    <option value="C">Cars</option>
    <option value="H">Honda</option>
    <option value="F">Fiat</option>
    <option value="I">Indigo</option>                    
</select> 

You can do it in pure JavaScript:

var selectobject = document.getElementById("mySelect");
for (var i=0; i<selectobject.length; i++) {
    if (selectobject.options[i].value == 'A')
        selectobject.remove(i);
}

But - as the other answers suggest - it's a lot easier to use jQuery or some other JS library.

Check the JQuery solution here

$("#selectBox option[value='option1']").remove();