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Change multiple dropdown values by selecting from a single dropdown

As the title says, Im trying to change the values on multiple dropdowns by changing a single dropdown. The multiple dropdowns need to get the same value that is selected in the "Select All" dropdown. Something very similar to a check all for checkboxes.
<select name="changeAll" id="changeAll" onchange="changeAll(this);">
<option value="select" selected="selected">Select</option>
<option value="option1">Option 1</option>
<option value="option2">Option 2</option>
<option value="option3">Option 3</option>
</select>
<select id="currency1" class="form-control">
<option selected value="option1" disabled>Option 1</option>
<option value="option1">Option 1</option>
<option value="option2">Option 2</option>
<option value="option3">Option 3</option>
</select>
<select id="currency2" class="form-control">
<option selected value="option1" disabled>Option 1</option>
<option value="option1">Option 1</option>
<option value="option2">Option 2</option>
<option value="option3">Option 3</option>
</select>
<select id="currency3" class="form-control">
<option selected value="option1" disabled>Option 1</option>
<option value="option1">Option 1</option>
<option value="option2">Option 2</option>
<option value="option3">Option 3</option>
</select>
The idea is that when a value is selected in the first dropdown "changeAll", all of the other dropdowns will have their values change to match the one selected in the "changeAll" dropdown.
Any help with this would be greatly appreciated.

Based on what you asked, I have tried to simulate. Try to run. Thnx
$('select#changeAll').on('change', function() {
var val_ = $('#changeAll :selected').text();
$('.child-changed option').map(function() {
$(this).text(val_);
$(this).value=val_;
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div>
<select name="changeAll" id="changeAll" >
<option value="ca_select" selected="selected">Select</option>
<option value="ca_option1">ca Option 1</option>
<option value="ca_option2">ca Option 2</option>
<option value="ca_option3">ca Option 3</option>
</select>
<div>
</div>
<select id="currency1" class="form-control child-changed">
<option selected value="c1_option1_selected" disabled>currency1 Option 1</option>
<option value="c1_option1">currency1 Option 1</option>
<option value="c1_option2">currency1 Option 2</option>
<option value="c1_option3">currency1 Option 3</option>
</select>
<div>
</div>
<select id="currency2" class="form-control child-changed">
<option selected value="c2_option1_selected" disabled>currency2 Option 1</option>
<option value="c2_option1">currency2 Option 1</option>
<option value="c2_option2">currency2 Option 2</option>
<option value="c2_option3">currency2 Option 3</option>
</select>
<div>

How to get selectbox values and prices when user select a option in jQuery?

For example this hotel is 3 rooms:
<div id="hotel_room">
<select name="room_1" price="30" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<select name="room_2" price="40" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<select name="room_3" price="50" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
And other hotel is 4 rooms:
<div id="hotel_room">
<select name="room_1" price="30" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<select name="room_2" price="40" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<select name="room_3" price="50" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<select name="room_3" price="50" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
how can I get the users selected , price, value when a selection happened using jquery.

this is how you can get all needed data when a selection.refer the working demo.
<html>
<head></head>
<title></title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<style>
</style>
<body>
<div id="hotel_room">
<select name="room_1" price="30" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<select name="room_2" price="40" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<select name="room_3" price="50" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
</div>
<script type="text/javascript">
$("div#hotel_room select").click(function(){
var getTheName = $(this).attr('name');
var getThePrice = $(this).attr('price');
var getTheValue = $(this).val();
alert("NAME :----> "+getTheName +" PRICE :-----> "+getThePrice +" VALUE :-----> "+getTheValue);
});
</script>
</body>
</html>
hope this will help to you.

Look at this code, maybe it will help you.
$('#button1').on('click', function() {
$('select').each(function(index) {
console.log( $(this).attr('name') + ': price=' + $(this).attr('price') + ' selected option: ' + $(this).val() );
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="hotel_room">
<select name="room_1" price="30" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<select name="room_2" price="40" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<select name="room_3" price="50" multiple="multiple">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
<option value="4">option 4</option>
</select>
<button id="button1">Click</button>
</div>

How can i manage all selectbox when onchange in any one of them?

I have listing week days on my web page and every day have a select box as like below
<select name="day1" >
<option value="">select</option>
<option value="1">Text 1</option>
<option value="2">Text 2</option>
<option value="3">Text 3</option>
</select>
<select name="day2" >
<option value="">select</option>
<option value="1">Text 1</option>
<option value="2">Text 2</option>
<option value="3">Text 3</option>
</select>
<select name="day3" >
<option value="">select</option>
<option value="1">Text 1</option>
<option value="2">Text 2</option>
<option value="3">Text 3</option>
</select>
.
.
.
.
Here if i select any option from "day2" then how can i make all others select box value default or null, as well as if i select with "day1" then day2 and day3 should be default or null using jQuery

Just create a change listener on all select and change every element what is not() itself.
$("select").change(function() {
$("select").not(this).val("");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="day1">
<option value="">select</option>
<option value="1">Text 1</option>
<option value="2">Text 2</option>
<option value="3">Text 3</option>
</select>
<select name="day2">
<option value="">select</option>
<option value="1">Text 1</option>
<option value="2">Text 2</option>
<option value="3">Text 3</option>
</select>
<select name="day3">
<option value="">select</option>
<option value="1">Text 1</option>
<option value="2">Text 2</option>
<option value="3">Text 3</option>
</select>

How to make chosen menu disabled by default

Here, I have an example of jquery-chosen with modal dialog. What I want is on first open of the dialog, the chosen to not show the items. I read the documentation and I don't find anything.
So in the current example the modal options should be closed after running the fiddle example:
HTML
<div id="dialog">
<label for="options1">Modal Options</label>
<select id="options1" multiple="multiple">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
<option value="4">Option 4</option>
<option value="5">Option 5</option>
<option value="6">Option 6</option>
<option value="7">Option 7</option>
</select>
</div>
<label for="options1">Options</label>
<select id="options2">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
<option value="4">Option 4</option>
<option value="5">Option 5</option>
<option value="6">Option 6</option>
<option value="7">Option 7</option>
</select>
JS
$(function(){
$("select").chosen();
$("#dialog").dialog({modal: true, width:400, height:"auto"});
});

Call jQuery chosen after calling dialog.
$(function(){
$("#dialog").dialog({modal: true, width:400, height:"auto"});
$("select").chosen();
});

jQuery Setting an option on a select box

I can't seem to get this to work...
<select id="selectBox">
<option value="A">Number 0</option>
<option value="B">Number 1</option>
<option value="C">Number 2</option>
<option value="D">Number 3</option>
<option value="E">Number 4</option>
<option value="F">Number 5</option>
<option value="G">Number 6</option>
<option value="H">Number 7</option>
</select>
$('#selectBox option[value=C]').attr('selected', 'selected');

Unless you are trying to do a multi-select list box, why not:
$('#selectBox').val('C');