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Checkvalue for display form element interfering with each other

I have a select box where one particular value is selected another field shows up.
I have no knowledge of javascript and have taken this code from somewhere.
I have this javascript in multiple places in the same form. But, my script works only on one input. If I select another from another select box, the value of previous input closes, the thing which I don't want. This will be well understood if you see the code.
The link where you can check the issue:
jsfiddle
Javascript:
function checkvalue(val) {
if (val === "NewSale")
document.getElementById('actualamt').style.display = 'block';
else
document.getElementById('actualamt').style.display = 'none';
if (val === "SchoolWearAccessories")
document.getElementById('schoolwear').style.display = 'block';
else
document.getElementById('schoolwear').style.display = 'none';
}
<form>
Product Category:
<select name="category" required onchange='checkvalue(this.value)'>
<option value="">Select Product Category</option>
<option value="School Uniforms">School Uniforms</option>
<option value="SchoolWearAccessories">School Wear Accessories</option>
<option value="Hospital Uniforms">Hospital Uniforms</option>
<option value="Corporate Uniforms">Corporate Uniforms</option>
<option value="Industrial Uniforms">Industrial Uniforms</option>
</select>
<div id="schoolwear" style="display:none;">
Sub Category:
<select name="subcategory">
<option value="">Select Product Category</option>
<option value="Uniform Sweaters">Uniform Sweaters</option>
<option value="School Belts">School Belts</option>
<option value="School Ties">School Ties</option>
<option value="Uniform Socks and Shoes">Uniform Socks and Shoes</option>
<option value="School Caps">School Caps</option>
<option value="School Bags">School Bags</option>
</select>
</div>
Tag:
<select name="producttag" onchange='checkvalue(this.value)'>
<option value="">None</option>
<option value="New">New</option>
<option value="Sale">Sale</option>
<option value="NewSale">New and Sale</option>
</select>
<div id="actualamt" style="display:none;">
Actual Amount:
<input type="number" name="actualamt" step="any" />
</div>
</form>
Help will be appreciated.

You should have different functions for each select onchange events.
I have renamed the function to checkvalueProductTag() and checkvalueCategory()
function checkvalueProductTag(val) {
if(val==="NewSale")
document.getElementById('actualamt').style.display='block';
else
document.getElementById('actualamt').style.display='none';
}
function checkvalueCategory(val){
if(val==="SchoolWearAccessories")
document.getElementById('schoolwear').style.display='block';
else
document.getElementById('schoolwear').style.display='none';
}
Check the updated fiddle
https://jsfiddle.net/6hheckao/1/

If you want both of them to be displayed on selection then simply use two different onchange functions like this
function checkvalue(val) {
if (val === "SchoolWearAccessories")
document.getElementById('schoolwear').style.display = 'block';
else
document.getElementById('schoolwear').style.display = 'none';
}
function checkvalue1(val) {
if (val === "NewSale")
document.getElementById('actualamt').style.display = 'block';
else
document.getElementById('actualamt').style.display = 'none';
}
<form>
Product Category:
<select name="category" required onchange='checkvalue(this.value)'>
<option value="">Select Product Category</option>
<option value="School Uniforms">School Uniforms</option>
<option value="SchoolWearAccessories">School Wear Accessories</option>
<option value="Hospital Uniforms">Hospital Uniforms</option>
<option value="Corporate Uniforms">Corporate Uniforms</option>
<option value="Industrial Uniforms">Industrial Uniforms</option>
</select>
<div id="schoolwear" style="display:none;">
Sub Category:
<select name="subcategory">
<option value="">Select Product Category</option>
<option value="Uniform Sweaters">Uniform Sweaters</option>
<option value="School Belts">School Belts</option>
<option value="School Ties">School Ties</option>
<option value="Uniform Socks and Shoes">Uniform Socks and Shoes</option>
<option value="School Caps">School Caps</option>
<option value="School Bags">School Bags</option>
</select>
</div>
Tag:
<select name="producttag" onchange='checkvalue1(this.value)'>
<option value="">None</option>
<option value="New">New</option>
<option value="Sale">Sale</option>
<option value="NewSale">New and Sale</option>
</select>
<div id="actualamt" style="display:none;">
Actual Amount:
<input type="number" name="actualamt" step="any" />
</div>
</form>

Javascript detect total of multiple select option to be sum up

I have a onchange multiple select option that can select multiple course then display the total price in other input values
However how to get the total price if I have another multiple select option for months to be sum up in that input
Each months's price is same
course select option code
<select class="form-control" onchange="selectFunction(event)"
name="pay_course[]" required="" multiple>
<option data-price="1111" value="courseId1">English</option>
<option data-price="2222" value="courseId2">Math</option>
</select>
month select option code
<select class="form-control" multiple="multiple" >
<option selected="selected" value="" name="pay_fee_month[]" disabled="true">Select Month...</option>
<option value='Janaury'>Janaury</option>
<option value='February'>February</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='August'>August</option>
<option value='September'>September</option>
<option value='October'>October</option>
<option value='November'>November</option>
<option value='December'>December</option>
</select>
Input to be display the total
<input type="number" value="" id="money" class="form-control">
Script
function selectFunction(e) {
var type_id = $('select option:selected').map(function() {
return $(this).attr('data-price');
})
.get().map(parseFloat).reduce(function(a, b) {
return a + b
});
console.log(type_id)
$("#money").val( type_id );
}

I would do it another way... Completely.
What you wish to have is the total price based on selected courses multiplied by the amount of selected months.
Below, is a script that does just that... On change of both selects.
$("#courses, #months").on("change", function(){
// Get the total price of the selected courses.
var price = 0;
$("#courses").find("option:selected").each(function(){
price += $(this).data("price");
});
console.log(price);
// Get the amount of selected months.
var monthCount = $("#months").find("option:selected").length;
console.log(monthCount);
// Multiply.
var total = monthCount * price;
$("#money").val(total);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="form-control" id="courses" name="pay_course[]" required="" multiple>
<option data-price="1111" value="courseId1">English</option>
<option data-price="2222" value="courseId2">Math</option>
</select>
<select class="form-control" id="months" multiple="multiple" >
<option value="" name="pay_fee_month[]" disabled>Select Month...</option>
<option value='January'>January</option>
<option value='February'>February</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='August'>August</option>
<option value='September'>September</option>
<option value='October'>October</option>
<option value='November'>November</option>
<option value='December'>December</option>
</select>
<input type="number" value="" id="money" class="form-control">
Notice that I removed the inline onchange handler and used jQuery .on()
I also removed the selected="selected" on the first month option since it also is disabled.

if choose this option and this option change to 3 option

I have a table rows (this is not real, this is only example for simple it):
id, cat, company, device.
for example some recordes:
1, computer, samsung, ativ
2, computer, lg, blabla
3, phones, samsung, s6
4, phones, sony, z5
I want that if I choose category (computer for example) this will open only the company that they have computer, In addition, when the user select the second select, this will give the option that remain.
I found here the answer for the first select but for the second I did find.
I dont want to do "if ..., if ..." because this is need to be from the database and automatic.
This is the example that i did:
http://jsfiddle.net/e464etcq/
HTML:
<select class="form-control" id="type" name="type">
<option value="">choose</option>
<option value="1">phones</option>
<option value="2">computers</option>
</select>
<select class="form-control" id="reason" name="reason">
<option value="">choose</option>
<option value="1" class="1">samsung</option>
<option value="2" class="1">lg</option>
<option value="3" class="2">samsung</option>
<option value="3" class="2">sony</option>
</select>
<input type="text" id="billing">
JQUERY:
jQuery(function($) {
var backupShipStates = $("#reason").html();
$("#type").change(function() {
var country = $(this).val();
var options = $(backupShipStates).filter(function() {
return !$(this).attr("class") || $(this).attr("class") == country; });
$("#reason").html(options);
});
});
do you have any suggition how to do it?
Thank you,
Omry.

If I've understand you, you could add a new change event to handle when the second select is changed.
So your code would be:
HTML
<select class="form-control" id="type" name="type">
<option value="">בחר</option>
<option value="1">phones</option>
<option value="2">computers</option>
</select>
<select class="form-control" id="reason" name="reason">
<option value="">choose</option>
<option value="1" class="1">samsung</option>
<option value="2" class="1">lg</option>
<option value="3" class="2">samsung</option>
<option value="3" class="2">sony</option>
</select>
<select class="form-control" id="third" name="third">
<option value="">choose</option>
<option value="1" class="1">Option3.1</option>
<option value="2" class="1">Option3.2</option>
<option value="3" class="2">Option3.3</option>
<option value="3" class="2">Option3.4</option>
</select>
<input type="text" id="billing">
jQuery
jQuery(function($) {
var backupShipStates = $("#reason").html();
var backupOption3 = $("#third").html();
$("#type").change(function() {
var country = $(this).val();
var options = $(backupShipStates).filter(function() {
return !$(this).attr("class") || $(this).attr("class") == country; });
$("#reason").html(options);
});
$("#reason").change(function(){
var reason = $(this).val();
var options = $(backupOption3).filter(function() {
return !$(this).attr("class") || $(this).attr("class") == reason; });
$("#third").html(options);
});
});
Here is not necessary PHP.

Multiple option selects to create unique shopping cart SKU

Is there a way of inserting a string into a field, whereby the string is predetermined depending on what options are selected from two drop down menus?
This is so that a combination of two drop down menus creates a unique SKU for that product, and that string referred to as a SKU is inserted into the input value of the item_number variable and then passed to paypal during checkout.
I will use the example of selling tee-shirts. So the combinations will be black/small, black/large, white/small, & white/large. And each will have a unique SKU of TEESHIRT-BS, TEESHIRT-BL, TEESHIRT-WS & TEESHIRT-WL respectively.
Here is my HTML for the option selects, however, I think I need some JavaScript to insert the SKU into the value field.
<input type="hidden" name="on0" value="colour"><b>select colour</b></><br>
<select name="os0" >
<option value="black">black</option>
<option value="white">white</option>
</select>
<br>
<br>
<input type="hidden" name="on1" value="size"><b>select size</b></><br>
<select name="os1" >
<option value="small">small</option>
<option value="large">large</option>
</select>
<!-- SKU-->
<input type="hidden" name="item_number" value="">

Try the following:
var sizeList = document.getElementById('size');
var colorList = document.getElementById('color');
sizeList.onchange = function() {
generateSku();
};
colorList.onchange = function() {
generateSku();
};
function generateSku() {
var selectedSize = sizeList.options[sizeList.selectedIndex].text;
var selectedColor = colorList.options[colorList.selectedIndex].text;
document.getElementById('sku').value = 'TEESHIRT-' + selectedColor.charAt(0).toUpperCase() + selectedSize.charAt(0).toUpperCase();
}
generateSku();
<input type="hidden" name="on0" value="colour"><b>select colour</b></><br>
<select id="color" name="os0" >
<option value="black">black</option>
<option value="white">white</option>
</select>
<br>
<br>
<input type="hidden" name="on1" value="size"><b>select size</b></><br>
<select id="size" name="os1" >
<option value="small">small</option>
<option value="large">large</option>
</select>
<!-- SKU-->
<input id="sku" name="item_number" value="">

Html/Javascript form calculation and validation in new page

I'm working on a website project and really need help as I'm new to all this. I'm basically given values to every option in the drop down menu's and make them add together which I've managed. But then I want to the total value from the menus to then be the range for a pseudo random to be a generated and added to the age I input.
When I hit submit I'd like it to calculate all that and display the result on a new page. I want to be able to do all this within javascript and html.
Any help would be greatly appreciated! My coding is below. Thanks so much!
<body>
<form id="form1" action="" method="post" onsubmit="return calcTotal(this)">
<select name=select1>
<option selected="selected" value="0">Chinese Zodiac</option>
<option value="3">Rat</option>
<option value="3">Ox</option>
<option value="4">Tiger</option>
<option value="2">Rabbit</option>
<option value="4">Dragon</option>
<option value="5">Snake</option>
<option value="3">Horse</option>
<option value="3">Sheep</option>
<option value="4">Monkey</option>
<option value="5">Rooster</option>
<option value="3">Dog</option>
<option value="3">Pig</option>
</select>
</select>
<br />
<select name=select2>
<option selected="selected" value="0">Star Sign</option>
<option value="2">Aries</option>
<option value="4">Taurus</option>
<option value="3">Gemini</option>
<option value="4">Cancer</option>
<option value="3">Leo</option>
<option value="2">Virgo</option>
<option value="2">Libra</option>
<option value="3">Scorpio</option>
<option value="2">Sagittarius</option>
<option value="4">Capricorn</option>
<option value="2">Aquarius</option>
<option value="3">Pisces</option>
</select>
<br />
<select name=select3>
<option selected="selected" value="0">Blood Type</option>
<option value="3">O</option>
<option value="2">A</option>
<option value="1">B</option>
<option value="3">AB</option>
</select>
<br />
<select name=select4>
<option selected="selected" value="0">Favourite Colour</option>
<option value="3">Black</option>
<option value="3">Blue</option>
<option value="2">Brown</option>
<option value="2">Green</option>
<option value="3">Orange</option>
<option value="3">Pink</option>
<option value="2">Purple</option>
<option value="4">Red</option>
<option value="2">Yellow</option>
<option value="2">White</option>
<option value="5">Other</option>
</select>
<br />
Age<input name="" type="number" value="" />
<br />
<input name="" type="submit" value="Total" />
<span>Total: </span><span id="result"></span>
</form>
<script type="text/javascript">
function calcTotal(oForm){
var sum = 0;
for(i=0; i < oSels.length; i++){
sum += new Number(oSels[i].value);
}
document.getElementById('result').innerHTML = sum;
return false;
}
window.onload=function(){
oSels = document.getElementById('form1').getElementsByTagName('select');
for(i=0; i < oSels.length; i++){
oSels[i].onchange=function(){
document.getElementById('result').innerHTML = '';
}
}
}
</script>

I played with your code. I don't now if it's someting like that that you wanted but here is an example of random score.
It now use the age to generate a value.
Take a look if you like it at my codepen.
I changed the age input:
Age<input id="age" name="" type="number" value="" />
I also added a new function to generate random number between min-max:
function getRandomInt (min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
And modified how the sum is calculated:
var age = document.getElementById('age').value;
sum = parseInt(age) + parseInt(getRandomInt(sum-(age / 4),sum+(age / 4)));
//Add some random. The more you are older, the more random it is.
You can do a lot of different generated sum. If you want less modifications, we also can take the last digit of the age to get the min/max value generated...
Edit:
To help you share variables between pages, Look at this question.

Adding this as an answer as the submitter considers it a good idea:
Put the result from all your maths into hidden fields. Then when you submit the form, the values will be passed along.
You don't need to do anything special really. Just add fields like this:
<input type="hidden" value="[yourValue]" name="fieldName" id="fieldId" />
For the yourValue part, simply insert your caclulated value from the JavaScript:
document.getElementById("fieldId").value = calculatedValue;
Since it's all part of the same form that you're submitting anyway, they will all be past along. You can retrieve the fields on the receiving page as normal.
I downloaded and edited your entire code block. I changed a couple of things.
1. You don't need the onsubmit on your form. You need a call the JavaScript function on a Total button. The submit button is added to submit the form when the user is done.
2. A hidden field to hold your result is added to the form.
3. The function where you do your calculation has an addition to send the calulated total to the new hidden field.
4. You need to add something to the ACTION, so it knows where to submit the form. You can also remove the ALERT. I just added that to be sure it worked right.
I've run and tested this, and it works exactly as expected. This is what the edited code looks like:
<body>
<form id="form1" action="" method="post">
<select name=select1>
<option selected="selected" value="0">Chinese Zodiac</option>
<option value="3">Rat</option>
<option value="3">Ox</option>
<option value="4">Tiger</option>
<option value="2">Rabbit</option>
<option value="4">Dragon</option>
<option value="5">Snake</option>
<option value="3">Horse</option>
<option value="3">Sheep</option>
<option value="4">Monkey</option>
<option value="5">Rooster</option>
<option value="3">Dog</option>
<option value="3">Pig</option>
</select>
</select>
<br />
<select name=select2>
<option selected="selected" value="0">Star Sign</option>
<option value="2">Aries</option>
<option value="4">Taurus</option>
<option value="3">Gemini</option>
<option value="4">Cancer</option>
<option value="3">Leo</option>
<option value="2">Virgo</option>
<option value="2">Libra</option>
<option value="3">Scorpio</option>
<option value="2">Sagittarius</option>
<option value="4">Capricorn</option>
<option value="2">Aquarius</option>
<option value="3">Pisces</option>
</select>
<br />
<select name=select3>
<option selected="selected" value="0">Blood Type</option>
<option value="3">O</option>
<option value="2">A</option>
<option value="1">B</option>
<option value="3">AB</option>
</select>
<br />
<select name=select4>
<option selected="selected" value="0">Favourite Colour</option>
<option value="3">Black</option>
<option value="3">Blue</option>
<option value="2">Brown</option>
<option value="2">Green</option>
<option value="3">Orange</option>
<option value="3">Pink</option>
<option value="2">Purple</option>
<option value="4">Red</option>
<option value="2">Yellow</option>
<option value="2">White</option>
<option value="5">Other</option>
</select>
<br />
Age<input name="" type="number" value="" />
<br />
<input name="" type="button" value="Total" onclick="calcTotal();" />
<input name="submit" type="submit" value="Submit" />
<span>Total: </span><span id="result"></span>
<input type="hidden" value="0" name="resultIs" id="resultIs" />
</form>
<script type="text/javascript">
function calcTotal(oForm) {
var sum = 0;
for (i = 0; i < oSels.length; i++) {
sum += new Number(oSels[i].value);
}
//This is what you are using to display the result to your user.
document.getElementById('result').innerHTML = sum;
//This will add the value of the result to a hidden field I added to the form. When you submit it, just request the value of "resultIs"
document.getElementById("resultIs").value = sum;
alert(sum);
return false;
}
//I really don't even see that this is needed. Your form doesn't need to be cleared onLoad.
window.onload = function() {
oSels = document.getElementById('form1').getElementsByTagName('select');
for (i = 0; i < oSels.length; i++) {
oSels[i].onchange = function() {
document.getElementById('result').innerHTML = '';
}
}
}
</script>