javascript怎样取dropdownlist的值?

Question

var tb=document.getElementById("DropDownList1").value;

Answer 1

document.getElementById("ddUser").options[document.getElementById("ddUser").selectedIndex].value仅供参考

Answer 2

去不出来啊!var tb=document.getElementById("DropDownList1").value;

Answer 3

function Button2_onclick() {
function Button1_onclick() {
var y=document.getElementById("DropDownList1").options[document.getElementById("DropDownList1").selectedIndex].value
window.alert(y);
}</script>    <asp:DropDownList ID="DropDownList1" runat="server" Height="22px" Width="79px">
    </asp:DropDownList><input id="Button1" type="button" value="button" language="javascript" onclick="return Button1_onclick()" />老师提示错误.!不知道为什么?

Answer 4

<input id="Button1" type="button" value="button" language="javascript" onclick="return Button1_onclick()" />是不是这里有问题，lz

Answer 5

getElementById要看HTML页面的id为准

Answer 6

这个是对的：document.getElementById("DropDownList1").options[document.getElementById("DropDownList1").selectedIndex].value

Answer 7

var _index = document.getElementById("DropDownList1").selectedIndex
var _value = document.getElementById("DropDownList1").options[_index].value
var _text = document.getElementById("DropDownList1").options[_index].text可以得到， 列表任意项的值, 和显示文本