I'm adding the VehicleDetails.VehicleMakeSelectedIndexChanged in the
OnPreRender event of the custom control.
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
if
(!Page.ClientScript.IsClientScriptBlockRegistered("VehicleClientSideScript"))
{
CreateClientSideScript();
}
}
private void CreateClientSideScript()
{
sb.Append("function vehiclemakeindexchanged(vehicleMakeId)");
sb.AppendLine();
sb.Append("{");
sb.AppendLine();
sb.Append("\tvar modelDDL = document.getElementById('" +
((DropDownList)this.FindControl("VehicleModelDDL")).ClientID + "');");
sb.AppendLine();
sb.Append("\tvar yearDDL = document.getElementById('" +
((DropDownList)this.FindControl("ManufactureYearDDL")).ClientID +
"');");
sb.AppendLine();
sb.Append("\tvar fuelDDL = document.getElementById('" +
((DropDownList)this.FindControl("FuelTypeDDL")).ClientID + "');");
sb.AppendLine();
sb.Append("\tvar transDDL = document.getElementById('" +
((DropDownList)this.FindControl("TransmissionTypeDDL")).ClientID +
"');");
sb.AppendLine();
sb.Append("\tvar engineDDL = document.getElementById('" +
((DropDownList)this.FindControl("EngineSizeDDL")).ClientID + "');");
sb.AppendLine();
sb.Append("\tvar trimDDL = document.getElementById('" +
((DropDownList)this.FindControl("VehicleTrimDDL")).ClientID + "');");
sb.AppendLine();
sb.AppendLine();
sb.Append("\tremoveAllDDLOptions(yearDDL, true);");
sb.AppendLine();
sb.Append("\tremoveAllDDLOptions(fuelDDL, true);");
sb.AppendLine();
sb.Append("\tremoveAllDDLOptions(transDDL, true);");
sb.AppendLine();
sb.Append("\tremoveAllDDLOptions(engineDDL, true);");
sb.AppendLine();
sb.Append("\tremoveAllDDLOptions(trimDDL, true);");
sb.AppendLine();
sb.AppendLine();
sb.Append("\tif (vehicleMakeId > 0)");
sb.AppendLine();
sb.Append("\t{");
sb.AppendLine();
sb.Append("\t\tvar hidVehicleMake =
document.getElementById('" +
((HtmlInputHidden)this.FindControl("hidVehicleMake")).ClientID +
"');");
sb.AppendLine();
sb.Append("\t\thidVehicleMake.value = vehicleMakeId;");
sb.AppendLine();
sb.Append("\t\ttry {");
sb.AppendLine();
sb.Append("\t\tvar obj =
VehicleDetails.VehicleMakeSelectedIndexChanged(vehicleMakeId,
vehiclemakeindexchanged_callback);");
sb.AppendLine();
sb.Append("\t\t} catch (err) {");
sb.AppendLine();
sb.Append("\t\talert(err.toString()); }");
sb.AppendLine();
sb.Append("\t}");
sb.AppendLine();
sb.Append("\telse");
sb.AppendLine();
sb.Append("\t{");
sb.AppendLine();
sb.Append("\t\tremoveAllDDLOptions(modelDDL, true);");
sb.AppendLine();
sb.Append("\t}");
sb.AppendLine();
sb.Append("}");
sb.AppendLine();
sb.AppendLine();
// This is the vehicle make call back method which gets
// the response from the ajax method call and populates
// the vehicle model drop down list
sb.Append("function
vehiclemakeindexchanged_callback(response)");
sb.AppendLine();
sb.Append("{");
sb.AppendLine();
sb.Append("\tvar modelDDL = document.getElementById('" +
((DropDownList)this.FindControl("VehicleModelDDL")).ClientID + "');");
sb.AppendLine();
sb.Append("\tremoveAllDDLOptions(modelDDL, false);");
sb.AppendLine();
sb.Append("\tmodelDDL.options[0] = new Option('Please
select', '0', false, false);");
sb.AppendLine();
sb.Append("\tvar models = response.value;");
sb.AppendLine();
sb.AppendLine();
sb.Append("\tfor (var i = 0; i <
models.Tables[0].Rows.length; i++)");
sb.AppendLine();
sb.Append("\t{");
sb.AppendLine();
sb.Append("\t\tmodelDDL.options[modelDDL.options.length] =
new Option(models.Tables[0].Rows[i][\"ModelDescription\"],
models.Tables[0].Rows[i][\"ModelDescription\"], false, false);");
sb.AppendLine();
sb.Append("\t}");
sb.AppendLine();
sb.Append("}");
sb.AppendLine();
sb.AppendLine();
}
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