在SelectedIndexChanged事件触发后调用javascript window.onload

Question

//我的问题是，当我异步触发ddlmodalitylist的SelectedIndexChanged事件（ajax调用）时，javascript load事件未被触发..我必须从服务器端触发onload事件。

window.onload = body_Onload;

     function body_Onload() {
        //javascript code
       }

    protected void ddlModalityList_SelectedIndexChanged(object sender, EventArgs e)
        {
            ddlStudy.Items.Clear();
            ListItem selectedPair = ddlModalityList.SelectedItem;
            string str= selectedPair.Value;

           int ID= Convert.ToInt32(str);

           if (ID == -1)
           {
              // ddlStudy.Items.Clear();
               return;
           }



            DataTable dataTableStudy = null;
            dataTableStudy = objSqlDbComm.ExecuteDatasetQuery(strSQL).Tables[0];

            var dictioneryStudy = new Dictionary<int, string>();
            foreach (DataRow dr in dataTableStudy.Rows)
            {          

                dictioneryStudy.Add(Convert.ToInt32(dr["Study_ID"]), dr["Study_Desc"].ToString());
            }

            ddlStudy.DataTextField = "Value";
            ddlStudy.DataValueField = "Key";
            ddlStudy.DataSource = dictioneryStudy;
            ddlStudy.DataBind();
            ddlStudy.Items.Insert(0, new ListItem("[Select]", "-1"));
            ddlStudy.Items[0].Selected = true;

        }

Answer 1

Sys.Application.add_init(your_bodyload_function);