javascript - How to tell if html element is manually selected or default -

javascript - How to tell if html element is manually selected or default -

in set of options can determine if selected value manually set vs defaulting using javascript (i can't modify html since i'm using build in framework functionality).

<select> <option value="a">a</option> <option value="b">b</option> <select>

should distinguishable

<select> <option value="a" selected="selected">a</option> <option value="b">b</option> <select>

even though both have selected.

javascript run on page load. need tell if html sent server selected , if not set selectedindex = -1

using onchange event can flag user has selected it.

var selection = document.getelementbyid('selection'); selection.onchange = function(){ user_selected = true; }

with markup this:

<select id="selection"> <option value="a">a</option> <option value="b">b</option> <select>

here's fiddle...

javascript jquery html