How to display placeholder text as option in React Select - javascript

I am using React Select Package for dropdown. I wanted the placeholder option to display in the menu option for the user to select it as the dropdown field is not mandatory and the user can leave them empty or unselected.
I have tried many ways. I created a Custom placeholder component to display, but that is also not working. I tried passing a hardcoded value in options array. But that would also not work as i will be getting options from api afterwards.
I have posted my code in Sandbox for better clarity.
https://codesandbox.io/s/stoic-bush-3wstx?file=/src/App.js

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I would like to select multiple values in a dropdown. But the dropdown options are asynchronously fetched through REST API. I tried with <select multiple> with ngFor Directive, but it didn't work.
You can always use check boxes in the drop-down list and create a custom directive that check if check box is selected then it triggers some CSS highlight style and furthermore if you don't want to show check-box set its visibility to invisible so it works but only under the hood
(Just an idea)
There would be some extra work like if the drop down goes out of focus you would want the check-boxes to be deselected again so you would also have to check for that in the directive.

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Instead of checkboxes you could select with multiple option.
I would recommend you to use select2 library for your requirement.
It provides search box along with multiple value selection and different styles also which is very handy because it's very difficult to style option tag in html.
Find below the select2 url:
https://select2.org/getting-started/installation

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I have a select menu with multiple options. Using jQuery I was trying to pre-populate the dropdown. I've tried using this code:
jQuery("select#attribute150").val("Double").click();
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Select2 Always show placeholder

I am using a select2 component for selection.
I fiddled an example together here:
https://fiddle.jshell.net/mmo2dqno/15/
What I am trying to do is:
Select an item via the select2 widget
Show that item in the div below
Dont show the label in the search box.
This works fine. The problem is, that when one item is selected, the searchbox isn't showing the placeholder attribute anymore.
How can I tell the browser to assume the input as empty and show the placeholder again?
You could kill the select2 plugin with JS, and then load it again.
Or you could use Js to choose an disabled placeholder option.

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Now for some country users I need to make default country as their own country in dropdown and show its corresponding trainings.
Kindly let me know how can I get this. I'm able to disable dropdown with specific country using jquery. But i want make readonly, because only when the value newform saves to sharepoint list.
Its happen for textbox not for dropdown.
Basically, this has been answered here:
How to make a dropdown readonly using jquery?
A hidden field is the key.

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