如何在Javascript中更改DropDownList选择的值？

Question

如何在javascript中更改所选值并在代码隐藏页面中获取所选值？ AutoPostBack设置为false。

Answer 1

您可以这样更改：

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;