How to change DropDownList Selected value in Javascript?

Question

how to change the selected value in javascript and get the selected value in codebehind page? AutoPostBack is set to false.

Answer 1

You can change it like this:

var ddl = document.getElementById('ddl-id');
var opts = ddl.options.length;
for (var i=0; i<opts; i++){
    if (ddl.options[i].value == "some-value"){
        ddl.options[i].selected = true;
        break;
    }
}

Answer 2

//setting the value of a drop down list
document.getElementById('my_drop_down').selectedIndex=2;