dropdownlist和textbox如何联动？

Question

在dropdownlist的SelectedIndexChanged事件里从数据库里取值到textbox里，但textbox里的值始终是第一次查询的结果，刷新也不行，怎么办？高手指点。THX

Answer 1

if(!Page.IsPostBack){
把page_load()里的代码写到这里
}

Answer 2

dropdownlist的AutoPostBack=true在 SelectedIndexChanged  事件中写上:  
//..........
// textbox1.text = dropdownlist1.SelectedValue

Answer 3

先dropdownlist的AutoPostBack=true
private void DropDownList1_electedIndexChanged(object sender, System.EventArgs e){
   TextBox1.Text = DropDownList1.SelectedItem.Text;
或 TextBox1.Text = DropDownList1.SelectedItem.Value;
}

Answer 4

是在这样实现的。LOAD 写入XML文件
在前台调用
<script language="vbscript">
dim Mydom
set Mydom=CreateObject("Msxml2.DOMDocument")
Mydom.async=false
mydom.setProperty "SelectionLanguage", "XPath"
dim selDom
sub loadunits()
'Mydom.load("../Xml/CellResult.xml")
Mydom.load("../web/Xml/CellResult.xml")
end sub function selvalue1(str1)  

if trim(str1)<>"" then             
set selDom=Mydom.documentElement.selectNodes("/NewDataSet/Table[SpotCheck_Id="+trim(str1)+"]")
for n=0 to selDom.length-1
set secend=selDom.item(n).childNodes                   
set oOption = document.createElement("OPTION")
oOption.text=secend.item(1).text
oOption.value=secend.item(0).text
mainlayer.selSpot.options.add(oOption)
next
end if
end function

</script>
<script language="javascript">
           
function ClearSel()
{    
var i,mStr,Inp;
                   
for (i=mainlayer.selSpot.length;i>=0;i--)
{
mainlayer.selSpot.remove(i);

            
}
//var oOption = document.createElement('OPTION');
//oOption.text = "";
//oOption.value = "";
//mainlayer.SelSpot.options.add(oOption);
}
 function show_target(obj){
                  (obj).style.visibility='visible';
                  (obj).style.zIndex=10;
                  (obj).style.left=event.clientX+document.body.scrollLeft;
                  (obj).style.top=event.clientY+document.body.scrollTop;
                   }
</script>

Answer 5

<select id="selName"   onclick="selvalue1(mainlayer.selName.value)" style="LEFT: 16px; VISIBILITY: hidden; POSITION: absolute; TOP: 16px"
onchange="javascript:ClearSel();mainlayer.Order.value=this.options[selectedIndex].text;" size="1" name="selName" runat="server" onblur ="javascript:if(this.options[selectedIndex].text==''){mainlayer.GFQM.text='';}">
</select>
<select id="selSpot" size="1" name="selSpot" runat="server" style="LEFT: 168px; VISIBILITY: hidden; POSITION: absolute; TOP: 16px"
onClick="javascript:if(mainlayer.selSpot.options.length>0){mainlayer.GFQM.value=this.options[selectedIndex].text;}else {alert('请先选择机型！');}">
</select>
<input id="Order" name="Order" readOnly type="text" runat="server" class="noborder"
onblur="javascript:mainlayer.selName.style.visibility='hidden';if(mainlayer.Order.value==''){mainlayer.selSpot.style.visibility='hidden';}" size=10 onfocus="javascript:mainlayer.GFQM.value='';show_target(mainlayer.selName);">
<input id="GFQM"  readonly  name="GFQM" runat="server" onfocus="javascript:show_target(mainlayer.selSpot);"  onblur ="javascript:mainlayer.selSpot.style.visibility='hidden';">

Answer 6

Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
        Select Case Me.DropDownList1.SelectedValue
            Case "1"
                Me.TextBox1.Text = 11
            Case "2"
                Me.TextBox1.Text = 22
            Case "3"
                Me.TextBox1.Text = 33        End Select
    End Sub
<asp:DropDownList id="DropDownList1" style="Z-INDEX: 107; LEFT: 320px; POSITION: absolute; TOP: 200px"
runat="server" AutoPostBack="True"></asp:DropDownList>