Rock.Web.UI.Controls.PhoneNumberBox.RenderBaseControl C# (CSharp) Method

        public void RenderBaseControl( HtmlTextWriter writer )
        {
            string cssClass = this.CssClass;

            writer.AddAttribute( HtmlTextWriterAttribute.Class, "input-group phone-number-box" + cssClass );
            if ( this.Style[HtmlTextWriterStyle.Display] == "none" )
            {
                // render the display:none in the inputgroup div instead of the control itself
                writer.AddStyleAttribute( HtmlTextWriterStyle.Display, "none" );
                this.Style[HtmlTextWriterStyle.Display] = string.Empty;
            }
            writer.RenderBeginTag( HtmlTextWriterTag.Div );

            this.CssClass = string.Empty;

            bool renderCountryCodeButton = false;

            var definedType = DefinedTypeCache.Read( Rock.SystemGuid.DefinedType.COMMUNICATION_PHONE_COUNTRY_CODE.AsGuid() );
            if ( definedType != null )
            {
                var countryCodes = definedType.DefinedValues.OrderBy( v => v.Order ).Select( v => v.Value ).Distinct();

                if ( countryCodes != null && countryCodes.Any() )
                {
                    if ( string.IsNullOrWhiteSpace( CountryCode ) )
                    {
                        CountryCode = countryCodes.FirstOrDefault();
                    }

                    if ( countryCodes.Count() > 1 )
                    {
                        renderCountryCodeButton = true;

                        writer.AddAttribute( HtmlTextWriterAttribute.Class, "input-group-btn" );
                        writer.RenderBeginTag( HtmlTextWriterTag.Div );

                        writer.AddAttribute( HtmlTextWriterAttribute.Class, "btn btn-default dropdown-toggle" );
                        writer.AddAttribute( HtmlTextWriterAttribute.Type, "button" );
                        writer.AddAttribute( "data-toggle", "dropdown" );
                        writer.RenderBeginTag( HtmlTextWriterTag.Button );

                        writer.Write( CountryCode + " " );

                        writer.AddAttribute( HtmlTextWriterAttribute.Class, "caret" );
                        writer.RenderBeginTag( HtmlTextWriterTag.Span );
                        writer.RenderEndTag();

                        writer.RenderEndTag();  // Button

                        writer.AddAttribute( HtmlTextWriterAttribute.Class, "dropdown-menu" );
                        writer.RenderBeginTag( HtmlTextWriterTag.Ul );

                        foreach ( string countryCode in countryCodes )
                        {
                            writer.RenderBeginTag( HtmlTextWriterTag.Li );

                            writer.AddAttribute( HtmlTextWriterAttribute.Href, "#" );
                            writer.RenderBeginTag( HtmlTextWriterTag.A );
                            writer.Write( countryCode );
                            writer.RenderEndTag();

                            writer.RenderEndTag();  // Li
                        }

                        writer.RenderEndTag();      // Ul

                        writer.RenderEndTag();      // div.input-group-btn
                    }
                }
            }

            if ( !renderCountryCodeButton )
            {
                writer.AddAttribute( HtmlTextWriterAttribute.Class, "input-group-addon" );
                writer.RenderBeginTag( HtmlTextWriterTag.Span );
                writer.Write( "<i class='fa fa-phone-square'></i>" );
                writer.RenderEndTag();
            }

            _hfCountryCode.RenderControl( writer );

            ( (WebControl)this ).AddCssClass( "form-control" );
            if ( !string.IsNullOrWhiteSpace( Placeholder ) )
            {
                this.Attributes["placeholder"] = Placeholder;
            }

            base.RenderControl( writer );

            writer.RenderEndTag();              // div.input-group

            this.CssClass = cssClass;
        }