您好我有3个下拉列表,我用<select>
标签实现。在第一个DDL我associeted下面的JavaScript函数getElementById返回空,但有元素
function aggiorna_provincia(tipo_pannello) {
var objregione;
objregione = document.getElementById("<%=regione_residenzaIDropDownList.ClientID%>");
id_regione = objregione.options[objregione.selectedIndex].value;
if (id_regione != 0) {
$.ajax({
url: "../jquery/update1.aspx",
type: "get",
data: "cc=" + id_regione + "&tp=" + tipo_pannello,
success: function (response) {
$("#div_provinciaI").html(response);
$("#<%=provincia_residenzaIDropDownList.ClientID%>").focus();
},
error: function() {
alert("errore di connessione");
}
});
}
break;
}
和UPDATE1页面
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim codice As Integer = Integer.Parse(Request.QueryString("cc").ToString())
Dim tipo_pannello As Integer = Integer.Parse(Request.QueryString("tp").ToString())
Dim regione As New List(Of regioni)
Using db_antiriciclaggio As New db_antiriciclaggioEntities
Try
regione = (From tab_r In db_antiriciclaggio.regioni Where tab_r.IDNazione = codice Select tab_r).ToList()
Catch ex As Exception
End Try
End Using
Response.Write("<div id='div_regioneI' style='text-align:left'>")
Response.Write("<select id='regione_residenzaIDropDownList' runat='server' onchange='aggiorna_provincia(1)'>")
If (regione.Count = 0) Then
Response.Write("<option value='0'>Scegli prima lo stato</option>")
Else
Response.Write("<option value='0'>Scegli la regione</option>")
End If
For Each temp In regione
Response.Write("<option value='" & temp.idregione & "'>" & temp.nomeregione & "</option>")
Next
Response.Write("</select>")
Response.Write("</div>")
End Sub
但是当我运行aggiorna_provincia()
功能(类似的功能更新第三DDL)第二DDL当我尝试在javascript函数中查找ddl时,我获得空对象
请在[jsfiddle](http://jsfiddle.net)或类似的服务上创建一个[*简单*测试用例](http://css-tricks.com/reduced-test-cases/),以便我们不必通过不相关的代码来争论。 – zzzzBov
我认为在jsfiddle,但代码无法运行,因为是Javascript和asp.net的组合 –
重点是*不*使用ASP.NET,并显示少量呈现输出的演示。 – zzzzBov