how to retrieve valeu from select in js code example

Example 1: c# remove from list in foreach

myList.RemoveAll(x => x.SomeProp == "SomeValue");

Example 2: How to remove options from selectlist in javascript?

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