Set select option 'selected', by value

Question

I have a select field with some options in it. Now I need to select one of those options with jQuery. But how can I do that when I only know the

Answer 1

This Works well

jQuery('.id_100').change(function(){ 
        var value = jQuery('.id_100').val(); //it gets you the value of selected option 
        console.log(value); // you can see your sected values in console, Eg 1,2,3
    });