在ASPX页面上动态加载数据

Question

I have an internal web service (ASP.NET) written on C# in a company I work for. There are only 2 pages in it, one of this pages contains DropDownList. Every time when user selecting an item from that DropDownList I need to somehow pass selected item value to a static method and show result string of that method anywhere on page.

I've never worked with ASP.NET or any web programming before and a bit confused about how to do it, not sure where to start looking even.

Answer 1

In your aspx file you should have this:

 <asp:ListBox ID="ListBox1" runat="server" AutoPostBack="True" 
            onselectedindexchanged="ListBox1_SelectedIndexChanged"></asp:ListBox>

Notice the AutoPostBack="True" which goes back to the server and fires the selectedindexchanged event immediately after the user changes the selection in the listbox

In your code-behind (.cs file) You should have this:

 protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
    {

        // Call static method and pass the ListBox1.SelectedIndex
        // MyStaticMethod(ListBox1.SelectedIndex);
    }

Answer 2

您可以设置autoPostBack =“ true”并在服务器端处理更改事件，或者使用jQuery订阅更改事件并在客户端获取值

Answer 3

You should probably check out some of the great resources that microsoft provides for new .NET developers. They will be really helpful in getting you started. Her is a link of some really good videos to help you out: http://www.asp.net/web-forms/videos

Not sure what language you are coming from, if any... But for the most part webforms is going to work a lot like other web based methodologies.

Your ASP.NET Controls (in your case the DropDownList) have both client and server side events.

You will probably want to map the server-side OnSelectedIndexChanged event on your DropDownList.

In order to cause a postback on that control you will want to set the AutoPostBack property to true on your DropDownList.

Answer 4

try this one

In html ,

        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" 
        onselectedindexchanged="DropDownList1_SelectedIndexChanged">
    </asp:DropDownList>

In aspx.cs page,,

 protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
    string selctedValue = DropDownList1.SelectedValue;
        /// Call yours static methid here
     YourMethod(selctedValue);
}