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I'm trying to build a custom dropdown-typeahead component in Blazor. I want it to be as following: 

Instead of the classic tag which on click displays a list, i want it to have an tag where the user can write something and search the list. On each character they write, the dropdown

The problem I'm dealing with is that I cannot display the selected item inside the tag. My code is the following:

Parent Component

I have a hierarchy-based event stream, where each hierarchy parent node(represented as level0/1) has multiple children (level0(0/1/2) and sub child (level00(0/1/2)). "level" is just a placeholder, each hierarchy level has its own unique name. The only rule is that a parent node hierarchy string is always included in the child's hierarchy string name. Assume that this event stream has 300k and more entries.

I would like to create external tables on a SQL Server 2019 instance running in an Ubuntu container querying an DB2 database on an AS400. I'm using the ibm iaccess 1.1.0.15 amd64 ODBC driver. When I try to create the external table, I get back the following error:

Msg 105082, Level 16, State 1, Line 15
105082;Generic ODBC error: NativeOdbcConnection.Open, error in OdbcConnectionCreate: SqlState: , NativeError: 111234, 'Error calling: SQLDriverConnect(this->_hdbc, NULL, (SQLWCHAR*)connectionString, SQL_NTS, NULL, 0, &cbConnStrOut, SQL_DRIVER_NOPROMPT), SQL return code: -1 | SQL Error Info: **Internal DmsNative error: SQLGetDiagRec returned: -1 | ConnectionPooling: 1 | Error calling: pConn->Create(connectionString, databaseName, useConnectionPooling, packetSize, connectionLoginTimeout, environmentSettings, transactionToken, transactionTokenSize, resourceGroupName, driverCapabilities, spid) | state: FFFF, number: 1, active connections: 1', Connection String: Driver={IBM i Access ODBC Driver};system=MYAS400SYSTEM;uid=MYAS400UID;server=MYAS400.MYDOMAIN.com.

Here is the Dockerfile I am using

I'm completely new and learning Python.

I'm getting the error in title. Should I convert the "str" to StringVar() ? If yes, how could I do it ?

Here is the problematic part of the code:

I have a website menu that shows the down-pointing arrow next to an item that has a submenu. This arrow ( ▼ ) is contained in a span like this: ▲ (this character: ▲)

In Javascript, I am attempting to use the following code (part of a larger script) - which works fine for changing plain alpha-numeric text (e.g. innerHTML === "text" etc) - to change it to the up-pointing arrow when the submenu is open: