How to select option in single select by javascript

[Faris]

 Hello,

I'm using async single select component like:

<aui-select id="select-user" name="user" onchange="onChangeUser()" src="$contextPath/rest/stplus/1.0/users" placeholder="Select user"></aui-select>

So i try to create user picker. On load modal with this component i have in my context initial user like '$user'.

Please tell me how can I set this user in single select, then fire change method that will call for response from src, and then select user from $user

I already try to

$('select-user input').val('$user')

$('select-user').change().trigger('change')

but it does not call select change method nor call src endpoint