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Pass Province or State value to hidden field with Javascript

I am new to javascript and cannot find an easy-to-understand answer. I would like a certain value to get passed to a hidden field when a user selects a certain option from 2 different select dropdown options. They can only select one or the other on the actual form.
For example if a user selects a US state or a Canadian province, I want to pass that value to hidden text field using javascript.
<form>
<p class="form-field state pd-select required">
<label class="field-label" for="usstatevalue">State</label>
<select name="usstatevalue" id="usstatevalue" class="select" onchange="">
<option value="" selected="selected"></option>
<option value="47815">AL</option>
<option value="47817">AK</option>
<option value="47819">AZ</option>
<option value="47821">AR</option>
<option value="47823">CA</option>
<option value="47825">CO</option>
<option value="47827">CT</option>
<option value="47829">DE</option>
<option value="47831">DC</option>
<option value="47833">FL</option>
<option value="47835">GA</option>
<option value="47837">HI</option>
</select>
</p>
<p class="form-field Province_Canada pd-select required">
<label class="field-label" for="provcanvalue">Province – Canada</label>
<select name="provcanvalue" id="provcanvalue" class="select" onchange="">
<option value="" selected="selected"></option>
<option value="47791">Alberta</option>
<option value="47793">British Columbia</option>
<option value="47795">Manitoba</option>
<option value="47797">New Brunswick</option>
<option value="47799">Newfoundland and Labrador</option>
<option value="47801">Nova Scotia</option>
<option value="47803">Nunavut</option>
<option value="47805">Ontario</option>
<option value="47807">Prince Edward Island</option>
<option value="47809">Quebec</option>
<option value="47811">Saskatchewan</option>
<option value="47813">Yukon</option>
</select>
</p>
<p class="form-field State_Province">
<label for="stateprovnew">hidden field</label>
<input type="text" name="stateprovnew" value="">
</p>
</form>

Following code will insert the selected state and country into the text field. You can make the field hidden it will work.
var stateSelector = document.getElementById('usstatevalue');
var countrySelector = document.getElementById('provcanvalue');
var hiddenSelector = document.getElementById('stateprovnew');
stateSelector.addEventListener('change', function() {
hiddenSelector.value = stateSelector.value;
});
countrySelector.addEventListener('change', function() {
hiddenSelector.value += ' ' + stateSelector.value;
});
<form>
<p class="form-field state pd-select required">
<label class="field-label" for="usstatevalue">State</label>
<select name="usstatevalue" id="usstatevalue" class="select" onchange="">
<option value="" selected="selected"></option>
<option value="47815">AL</option>
<option value="47817">AK</option>
<option value="47819">AZ</option>
<option value="47821">AR</option>
<option value="47823">CA</option>
<option value="47825">CO</option>
<option value="47827">CT</option>
<option value="47829">DE</option>
<option value="47831">DC</option>
<option value="47833">FL</option>
<option value="47835">GA</option>
<option value="47837">HI</option>
</select>
</p>
<p class="form-field Province_Canada pd-select required">
<label class="field-label" for="provcanvalue">Province – Canada</label>
<select name="provcanvalue" id="provcanvalue" class="select" onchange="">
<option value="" selected="selected"></option>
<option value="47791">Alberta</option>
<option value="47793">British Columbia</option>
<option value="47795">Manitoba</option>
<option value="47797">New Brunswick</option>
<option value="47799">Newfoundland and Labrador</option>
<option value="47801">Nova Scotia</option>
<option value="47803">Nunavut</option>
<option value="47805">Ontario</option>
<option value="47807">Prince Edward Island</option>
<option value="47809">Quebec</option>
<option value="47811">Saskatchewan</option>
<option value="47813">Yukon</option>
</select>
</p>
<p class="form-field State_Province">
<label for="stateprovnew">hidden field</label>
<input type="text" name="stateprovnew" id="stateprovnew" value="">
</p>
</form>

Exclude/disable previously selected option from drop-down

I have 3 drop-downs: Product, Batch and Storage
HTML:
<div class="row div-1">
<div class="form-group">
<select class="form-control product-id">
<option value="" disabled selected>Select Product</option>
<option value="1">Product One</option>
<option value="2">Product Two</option>
</select>
</div>
<div class="form-group">
<select class="form-control product-batch">
<option value="" disabled selected>Select Batch</option>
<option value="1">Batch One</option>
<option value="2">Batch Two</option>
</select>
</div>
<div class="form-group">
<select class="form-control product-storage">
<option value="" disabled selected>Select Storage</option>
<option value="1">Storage One</option>
<option value="2">Storage Two</option>
</select>
</div>
</div>
<div class="row div-2">
<div class="form-group">
<select class="form-control product-id">
<option value="" disabled selected>Select Product</option>
<option value="1">Product One</option>
<option value="2">Product Two</option>
</select>
</div>
<div class="form-group">
<select class="form-control product-batch">
<option value="" disabled selected>Select Batch</option>
<option value="1">Batch One</option>
<option value="2">Batch Two</option>
</select>
</div>
<div class="form-group">
<select class="form-control product-storage">
<option value="" disabled selected>Select Storage</option>
<option value="1">Storage One</option>
<option value="2">Storage Two</option>
</select>
</div>
</div>
How to check if options are already selected based on 3 select options?
What I mean is if "Product One", "Batch One" and "Storage One" from div-1 is already selected and if I try to select same drop-down options in div-2, it should not allow to select again already selected options.
But can allow if I select "Product One", "Batch Two" and "Storage Two".
In short same selected options cannot be repeated.

ng-required not working properly on select the value from dropdown

I have Date of birth drop down field,from that i selected the month,date and year values from dropdown.After selecting them as the error message showing previously it worked fine.
my code for that:
<div class="form-group form-inline">
<span for="">Birthday</span>
<div class="row panel-body">
<select name="month" id="month" class="custom-select col-xs-4" ng-model="dateOfBirth.month" onchange="call()" required >
<option value="">Month</option>
<option value="1">Jan</option>
<option value="2">Feb
<option value="3">Mar</option>
<option value="4">Apr</option>
<option value="5">May</option>
<option value="6">Jun</option>
<option value="7">Jul</option>
<option value="8">Aug</option>
<option value="9">Sep</option>
<option value="10">Oct</option>
<option value="11">Nov</option>
<option value="12">Dec</option>
</select>
<select name="day" id="day" class="custom-select col-xs-4" ng-model="dateOfBirth.day" onchange="call()" required>
<option value="">Day</option>
</select>
<select name="year" id="year" class="custom-select col-xs-4" ng-model="dateOfBirth.year" onchange="call()" required>
<option value="">Year</option>
</select>
</div>
<div ng-show="(frm.month.$touched || frm.day.$touched || frm.year.$touched)">
<span style="color:red" ng-show="((frm.month.$touched && frm.month.$error.required) || (frm.day.$touched && frm.day.$error.required) || (frm.year.$touched && frm.year.$error.required))">Date is required</span>
</div>
</div>
Error getting even if i select the values from the dropdown.

Dropdownlist using javascript

I have these 3 dropdownlist. I want to show only 1 dropdownlist according to values selected in the first DDL. can someone help me with this :
HTML :
<div class="field">
<label for="message_for">Message For</label>
<select id="message_for" name="message_for" title="Message For" >
<option value='shop'>Shops</option>
<option value='offers'>Offers</option>
<option value='events'>Events</option>
<option value='consultancy'>Consultancy</option>
</select>
</div>
<div class="field1">
<label for="message_type">Message Type</label>
<select id="offer_type" name="offer_type" title="Offer Type" >
<option value='special'>Special</option>
<option value='recommend'>Recommended</option>
<option value='day'>Offer of the Day</option>
<option value='hot'>Hot Offer</option>
</select>
</div>
<div class="field2">
<label for="message_type">Message Type</label>
<select id="shop_type" name="shop_type" title="Shop Type" >
<option value='mall'>Mall</option>
<option value='warehouse'>Warehouse</option>
<option value='food'>Food</option>
<option value='banquet'>Banquet</option>
<option value='service'>Service</option>
<option value='cosmetics'>Cosmetics</option>
<option value='fashion'>Fashion</option>
</select>
</div>
<div class="field3">
<label for="message_type">Message Type</label>
<select id="event_type" name="event_type" title="Event Type" >
<option value='social'>Social</option>
<option value='other'>Other</option>
</select>
</div>
Means if i select shops in first DDL then the second DDL should be DIV field2

Basically, the idea is to get the value of message_for select using jquery and show or hide other selects based on its value.
$("#message_for").on("change", function(){
if($(this).val() == "shop"){
$(".field1").show();
}
//here add more cases to show relevant selects
});
I have created this jsfiddle for you - https://jsfiddle.net/guranjanpsingh/h9prdxyy/2/

The easiest way is to add classes to divs with the same name as option values in order to target them.
$('div:not(".general")').hide();
$('#message_for').on('change', function() {
$('div:not(".general")').hide();
$('.' + $(this).val()).show();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="general">
<label for="message_for">Message For</label>
<select id="message_for" name="message_for" title="Message For">
<option value=''>Please Select</option>
<option value='shop'>Shops</option>
<option value='offers'>Offers</option>
<option value='events'>Events</option>
<option value='consultancy'>Consultancy</option>
</select>
</div>
<div class="shop">
<label for="message_type">Message Type</label>
<select id="offer_type" name="offer_type" title="Offer Type">
<option value='special'>Special</option>
<option value='recommend'>Recommended</option>
<option value='day'>Offer of the Day</option>
<option value='hot'>Hot Offer</option>
</select>
</div>
<div class="offers">
<label for="message_type">Message Type</label>
<select id="shop_type" name="shop_type" title="Shop Type">
<option value='mall'>Mall</option>
<option value='warehouse'>Warehouse</option>
<option value='food'>Food</option>
<option value='banquet'>Banquet</option>
<option value='service'>Service</option>
<option value='cosmetics'>Cosmetics</option>
<option value='fashion'>Fashion</option>
</select>
</div>
<div class="events">
<label for="message_type">Message Type</label>
<select id="event_type" name="event_type" title="Event Type">
<option value='social'>Social</option>
<option value='other'>Other</option>
</select>
</div>

How to properly pass dynamic input fields to another page for display?

So I have "add" and "delete" buttons that will respectively add/delete input fields. I also have a "preview" button ( using anchor tags) that will send the user to the next page. Upon clicking the preview button, I want to collect all information given and re-displayed on the next page.
I'm totally un aware of how to collect this dynamic information (user will add/delete BEFORE hitting preview, so the amount of input is unknown). How can I pass all this?
Here is what my code/markup looks like (Sorry if it is too many lines of code, I just want to give you as much information as possible):
JavaScript for deleting and adding fields:
<script>
$(document).ready(function() {
$(".add").on('click', function() {
var linehtml = $('.line').html();
var total = $('.line').length;
var dele = (total - 1);
$('#linecont').append('<div class="line"><hr />'+linehtml+'</div>');
return false;
});
$(".del").on('click', function() {
var linecont = $("#linecont");
var total = linecont.find('.line').length;
var dele = (total - 1);
if(total === 1) {
return false;
}
$('.line').eq(dele).remove();
return false;
});
});
</script>
HTML:
<div align="center">
Add Line
Delete Line
<div style="width: 40%; margin:0 auto">
<label>Campaign Name</label>
<input type="text" placeholder="Campaign Name:" />
</div>
</div>
<div id="linecont">
<div class="line">
<div class="row">
<div class="large-6 columns">
<label>Status:</label>
<select>
<option value="New">New</option>
<option value="Changed">Changed</option>
</select>
<label>Product:</label>
<select>
<option value="Mobile">Mobile</option>
<option value="Social">Social</option>
<option value="Online">Social</option>
</select>
<label>Model:</label>
<select>
<option value="CPC">CPC</option>
<option value="CPI">CPI</option>
<option value="CPM">CPM</option>
<option value="CPA">CPA</option>
<option value="CPD">CPD</option>
</select>
<label>Unit Rate:</label>
<input type="text" placeholder="Just type amount">
</div>
<div class="large-6 columns">
<label>URL Link:</label>
<input type="text" placeholder="URL Link" />
<label>Targeting Info:</label>
<input type="text" placeholder="Target Info">
<label>Total Budget:</label>
<input type="text" placeholder="Total Budget">
<label>Daily Budget:</label>
<input type="text" placeholder="Daily Budget">
</div>
</div>
<div style="width: 40%; margin:0 auto">
<label>Total Units:</label>
<input type="text" placeholder="Total Units">
</div>
<div class="row">
<div class="small-2 columns">
<label>Start Month:</label>
<select>
<option value="Jan">Jan</option>
<option value="Feb">Feb</option>
<option value="March">March</option>
<option value="April">April</option>
<option value="May">May</option>
<option value="June">June</option>
<option value="July">July</option>
<option value="Aug">Aug</option>
<option value="Sept">Sept</option>
<option value="Oct">Oct</option>
<option value="Nov">Nov</option>
<option value="Dec">Dec</option>
</select>
</div>
<div class="small-2 columns">
<label>Day:</label>
<select>
<option value="1">1</option>
<option value="2">2</option>
<option value="2">3</option>
<option value="3">4</option>
<option value="4">5</option>
<option value="4">6</option>
<option value="5">7</option>
<option value="6">8</option>
<option value="7">9</option>
<option value="8">10</option>
<option value="9">11</option>
<option value="11">12</option>
<option value="12">13</option>
<option value="13">14</option>
<option value="14">15</option>
<option value="15">16</option>
<option value="16">17</option>
<option value="17">18</option>
<option value="18">19</option>
<option value="19">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
</select>
</div>
<div class="small-2 columns">
<label>Year:</label>
<input type="text" placeholder="Type in Year" />
</div>
<div class="small-2 columns">
<label>End Month:</label>
<select>
<option value="Jan">Jan</option>
<option value="Feb">Feb</option>
<option value="March">March</option>
<option value="April">April</option>
<option value="May">May</option>
<option value="June">June</option>
<option value="July">July</option>
<option value="Aug">Aug</option>
<option value="Sept">Sept</option>
<option value="Oct">Oct</option>
<option value="Nov">Nov</option>
<option value="Dec">Dec</option>
</select>
</div>
<div class="small-2 columns">
<label>Day:</label>
<select>
<option value="1">1</option>
<option value="2">2</option>
<option value="2">3</option>
<option value="3">4</option>
<option value="4">5</option>
<option value="4">6</option>
<option value="5">7</option>
<option value="6">8</option>
<option value="7">9</option>
<option value="8">10</option>
<option value="9">11</option>
<option value="11">12</option>
<option value="12">13</option>
<option value="13">14</option>
<option value="14">15</option>
<option value="15">16</option>
<option value="16">17</option>
<option value="17">18</option>
<option value="18">19</option>
<option value="19">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
</select>
</div>
<div class="small-2 columns">
<label>Year:</label>
<input type="text" placeholder="Type in Year" />
</div>
</div>
</div>
</div>
<hr>
<div class="panel" style="width:98%; margin:0 auto">
<h5>Terms and Conditions</h5>
<p>I.</p>
<p>II.</p>
<p>III.</p>
<p>IV.</p>
</div>
<hr>
<div align="center">
Preview
</div>

If the information doesn't need to be secure, just use the url to pass parameters:
How to get the value from the GET parameters?
1) on your onclick function, you collect the information and create a string that is going to be the new url (with the parameters)
2) use window.location = newUrl; to access the link
3) in the new page, parse the URL to get the info

You can use localStorage variable to pass values between pages
eg. page 1:
localStorage.setItem("key","value");
page 2:
var value=localStorage.getItem("key");