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How to get the selected text of options in multiple select?

I am trying to get the selected option in multiple select, I can get the value in the form of an array, but I can't get the text of the option.
$(function() {
$('#sizeAddCategory').change(function(e) {
var selected = $(e.target).text();
console.log("selected " + selected);
$('#textAreaAddCategory').val(selected.join(','));
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="form-group col-sm-6">
<label for="sel1">Select Sizes (hold ctrl or shift (or drag with the mouse) to select more than one):</label>
<br/>
<select required class="form-control" id="sizeAddCategory" multiple>
<option value="1">one</option>
<option value="2">two</option>
<option value="3">three</option>
<option value="4">four</option>
</select>
</div>
<div class="form-group col-md-3">
<label for="name">Selected Sizes</label>
<br/>
<textarea required disabled rows="4" class="form-control" id="textAreaAddCategory"></textarea>
</div>
On $(e.target).text(), I am getting all the options text, I need the text of only selected options, so I can display it in the textarea.

Using .text() on a select will give the text of the control - i.e. all of the options, not just the selected ones.
To get the selected text (not value as you pointed out you can already get), you can use:
$(this).find("option:checked").map((i,e)=>$(e).text()).toArray();
Here, $(this).find("option:checked") will give you the option elements that have been selected while the .map will return the .text() for each of those values into a jquery array, with .toArray() to convert to a normal js array.
$(function() {
$('#sizeAddCategory').change(function() {
var selected = $(this).find("option:checked").map((i,e)=>$(e).text()).toArray();
console.log("selected", selected);
$('#textAreaAddCategory').val(selected.join(','));
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="form-group col-sm-6">
<label for="sel1">Select Sizes (hold ctrl or shift (or drag with the mouse) to select more than one):</label>
<br/>
<select required class="form-control" id="sizeAddCategory" multiple>
<option value="1">one</option>
<option value="2">two</option>
<option value="3">three</option>
<option value="4">four</option>
</select>
</div>
<div class="form-group col-md-3">
<label for="name">Selected Sizes</label>
<br/>
<textarea required disabled rows="4" class="form-control" id="textAreaAddCategory"></textarea>
</div>

It's because the target that you're defining is in the select tag. Instead of using:
$('#sizeAddCategory').change(function(e) {
use:
$('.option-category').click(function(e) {
and add a class in the options:
<option value="{{$size->id}}" class="option-category">{{$size->name}}</option>

you write :
var selected = $(e.target).text();
you should get the value of selectbox and
you should write
var selected = $(e.target).val();

oh my god
i right now understand what did you mean
ok
write :
$("#selectBox").change(function(e){
var x = $(e.target).find("option:checked").text();
console.log(x);
});

How do I change select to input text while checkbox is checked?

It's my first contact with js so please don't hate me
I have something like this:
function Zmiana(isChecked) {
document.getElementById('test').type = 'text';
}
<div class="dropdown">
<select id="test" name="producent" class="dropdown-select">
<option value="Apple">Apple</option>
<option value="Samsung">Samsung</option>
<option value="Lenovo">Lenovo</option>
</select> <br>
</div>
But it doesn't work

You won't be changing the select into a textbox. Instead, you'll have both a select and a textbox. The checkbox will simply determine which is shown.
Also, your select should include a first choice that is not considered valid so that you don't get a submitted value that the user didn't choose.
.hidden { display:none; }
<input type="checkbox" id="check">Check to enter text directly
<div class="dropdown">
<select id="test" name="producent" class="dropdown-select">
<option value="">--- Choose ---</option>
<option value="Apple">Apple</option>
<option value="Samsung">Samsung</option>
<option value="Lenovo">Lenovo</option>
</select>
<input id="data" class="hidden">
</div>
<script>
let text = document.getElementById('data');
let check = document.getElementById("check");
let select = document.getElementById("test");
// You must set up your function to handle the
// click event of the checkbox
check.addEventListener("click", Zmiana);
function Zmiana(){
// Add or remvoe the hidden class based on
// whether it's already in use
select.classList.toggle("hidden");
text.classList.toggle("hidden");
}
</script>

setting value of an input with jQuery doesn't work

I'm trying to set the value of a dropdown list based on another dropdown list value inside Angular and using jQuery, it works and it auto selects the wanted value but it doesn't add the value to the database after submitting. I'm sure everything is fine concerning the database connection because choosing any other selected value (for example euro in this case) is added to database.
$(document).ready(function() {
$("#country").change(function() {
var val = $(this).val();
if (val == "usa") {
$("#currency").val("dollar");
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form (ngSubmit)="onSubmit()">
<select id="country" name="country">
<option value="usa">usa</option>
<option value="france">france</option>
</select>
<select id="currency" name="currency">
<option value="dollar">dollar</option>
<option value="euro">euro</option>
</select>
<button type="submit" class="btn btn-primary">submit </button>
</form>
NB: Dollar becomes selected but when submitting it's not added to database, whereas if I remove the jQuery function and choose manually the currency , it adds to the database and everything is fine .

The jQuery code seems to be good... but my question is, why are you using jQuery to update a form in Angular.
Did you evaluate use tempalte-driven or reactive forms instead? Below you can find your form written as template driven.
<form (ngSubmit)="onSubmit()">
<select id="country" name="country" (change)="onCountryChange()" [(ngModel)]="selectedCountry">
<option
*ngFor="let country of countries"
[value]="country">
{{ country }}
</option>
</select>
<select id="currency" name="currency" [(ngModel)]="selectedCurrency">
<option
*ngFor="let currency of currencies"
[value]="currency">
{{ currency }}
</option>
</select>
<button type="submit" class="btn btn-primary">submit </button>
</form>
And in this plunkr you can find the full example using template-driven form... but if I where you, I would go for the reactive form approach.

How to save name of select option instead of value

I have this code:
$("#subscription").on('change', function(){
$('#plan').val($(this).val());
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="bank_name" class="form-control input-md chosen-select" id="subscription">
<option value="">Choose Bank</option>
<option value="swiftbank1">bank 1</option>
<option value="swiftbank2">bank 2</option>
</select>
<input type="text" id="plan" class="form-control input-md" name="swift">
What it does is add swift code in to the input field, that works fine!
Problem is that when I add data on database then both values is what I choose example I choose bank 1 then both will be saved as swiftbank1 .
I need it to save bank name (bank 1) and swift (swiftbank1) in database.
I understand that value is what it is but is it possible to add name in database instead of value? In this case this value works to be passed from selection to input.
Thanks

You can use .text for getting selected text.
$("#subscription").on('change', function(){
var text = $("#subscription :selected").text();
var value = $("#subscription").val();
console.log(text); // this will print text
console.log(value); // this will print value
//var plan = $('#plan').val(text); // this will change the value of plan
$("#plan").attr("value",text); // this will add the value attribute
$('#plan').val(text); // this will change the value of plan
$('#subscription :selected').val(value);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<select name="bank_name" class="form-control input-md chosen-select" id="subscription">
<option value="">Choose Bank</option>
<option value="swiftbank1">bank 1</option>
<option value="swiftbank2">bank 2</option>
</select>
<input type="text" id="plan" class="form-control input-md" name="swift">

try this to get text of selected option
$("#subscription").on('change', function(){
$('#plan').val(this.options[this.selectedIndex].text);
});

Since you will need to pass the value to store in database so a quick way is to keep the value as swiftbank1###bank1
Split the string with ### on server end and store them separately like this:
$selectValue = $_POST['select_name'];
$valueArray = explode("####",$selectValue);
$valueArray[0] will have swiftbank1 and $valueArray[1] will have bank1

use this $('#plan').val($('#subscription option:selected').text());

Javascript - return selected value of a select MVC6 taghelper element using a function

I am using ASP.NET core MVC6 so I'm using a select taghelper for the dropdown. This all works and I have a dropdown with states. As can be seen below there is a selected state.
In Javascript I wanted to get the selected value of this dropdown. I tried each of these:
var getSelectedState1 = function () {
return $State.val;
};
var getSelectedState2 = function () {
return $("#State").val;
};
..and both returned empty strings.
As "State" is the element ID of the state select element which I've identified both from Dave Paquette's blog and also from the page source...
<div class="form-group">
<label class="col-md-2 control-label" for="State">State:</label>
<div class="col-md-10">
<select class="form-control" data-val="true" data-val-required="A State name is required" id="State" name="State"><option value="NSW">New South Wales</option>
<option selected="selected" value="VIC">Victoria</option>
<option value="QLD">Queensland</option>
<option value="SA">South Australia</option>
<option value="WA">Western Australia</option>
<option value="TAS">Tasmania</option>
<option value="NT">Nothern Territory</option>
<option value="ACT">Australian Captial Territory</option>
</select>
<span class="text-danger field-validation-valid" data-valmsg-for="State" data-valmsg-replace="true" />
</div>
eg id="State".
Using a breakpoint and checking the value of "getSelectedState" I get an empty return for both attempts.
How do I populate a variable "getSelectedState" with the selected value of the dropdown using a function?
Note: Whilst this is aimed at Javascript people the problem might be in relation to the fact that its an MVC6 Taghelper element and I'm not accessing it correctly - this might be why its returning "" and not the javascript.