根据textbox中的值，改变dropdownlist的选项

前台:

function Select(txtId,ddlId) { function myFunc() { //alert(document.getElementById(txtId).value); //alert(document.getElementById(ddlId).value); var data = document.getElementById(txtId).value; var ddlgradelevel = document.getElementById(ddlId); for (var i = 0; i < ddlgradelevel.options.length; i++) { if (ddlgradelevel.options[i].text.indexOf(data) != -1) { ddlgradelevel.options[i].selected = true; break; } } } document.getElementById(txtId).attachEvent("onkeyup", myFunc); }

后台:

protected void Page_Load(object sender, EventArgs e) { System.Web.UI.ScriptManager.RegisterStartupScript(TbGDZCHAO, GetType(), GetType().FullName, "function a(){Select('" + TbGDZCHAO.ClientID + "','" + DropDownList3.ClientID + "');};setTimeout('a()',0);", true); }