I have a JavaScript function which i call in the onchange handler of a dropdownlist. If the selected value of dropdownlist is "1" i want to call one function in codebehind. Following is the function in JavaScript:
function GetAdmissionType()
{
InitComponents();
var type="";
type=document.getElementById(dlAdmissionType.id).value;
document.getElementById(hdnAdmissionType.id).value=document.getElementById(dlAdmissionType.id).value;
if(type=="1")
{
}
}
If type is 1 then i want to work following code in codebehind
public void LoadSemesters()
{
//code to load other dropdownlists
}
Can anybody help to call function in codebehind from JavaScript?
最简单的方法是将代码隐藏功能公开为Web服务调用,并使用类似jQuery的东西从Javascript调用它。
It may depend on what you want to do with the other values in the drop-down list. But, the easiest way to do this is to wrap your drop-down list in an update panel and handle the OnSelectedIndexChanged event in your code-behind.
ASPX page:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" onselectedindexchanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Value="1">item 1</asp:ListItem>
<asp:ListItem Value="2">item 2</asp:ListItem>
<asp:ListItem Value="3">item 3</asp:ListItem>
<asp:ListItem Value="4">item 4</asp:ListItem>
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
Code behind:
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (DropDownList1.SelectedValue)
{
case "1":
LoadSemesters();
break;
case "2":
case "3":
case "4":
default:
// do something
break;
}
}
Then you wouldn't need to do any javascript processing (unless you wanted to).
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