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Why isn't the second selection disabled when i pick all products in the first one?

https://jsfiddle.net/a8r057du/
I don't understand why I don't disable the select "A" when I select the all products option
<form method="post" action="shop.php">
<select name='filterp'>
<option defaultSelected>Please select an option</option>
<option value="allp" isSelect="disabled()">All Products</option>
<option value="milan">Products Milan</option>
<option value="juve" >Products Juventus</option>
</select>
<script>
function disabled()
{
document.getElementsById("A").disabled=false;
}
</script>
<select name="A" id="A">
<option defaultSelected>Please select an option</option>
<option id="mesh" value="mesh">mesh</option>
<option id="shorts" value="shorts">shorts</option>
<option id="socks" value="socks">socks</option>
</select>
<input type="submit" value="Filter" id="filtrogo" >

you have isSelect="disabled()" in your code which doesnt do anything because its not an actual method
to disable the select if the option is selected, you need to use onchange or the change eventListener and check if the option you clicked is the "all products" option
js code :
function change(value){
if(value === "allp"){
document.getElementById("A").disabled = true;
}
}
here, i used an if statement to check if the value is "allp" which is the "all products" option and disable the select element
another problem is you havedocument.getElementById("A").disabled = false; , it should be true
full code:
<form method="post" action="shop.php">
<select name='filterp' onchange="selectOnchange(value)">
<option defaultSelected>Please select an option</option>
<option value="allp">All Products</option>
<option value="milan">Products Milan</option>
<option value="juve" >Products Juventus</option>
</select>
<script>
function selectOnchange(value){
if(value === "allp"){
document.getElementById("A").disabled= true;
}
}
</script>
<select name="A" id="A">
<option defaultSelected>Please select an option</option>
<option id="mesh" value="mesh">mesh</option>
<option id="shorts" value="shorts">shorts</option>
<option id="socks" value="socks">socks</option>
</select>
<input type="submit" value="Filter" id="filtrogo" >
</form>
and you also used document.getElementsById which is wrong, it should be getElementById

thank you very much you saved me
<form method="post" action="shop.php">
<select name='filterp' onchange="selectOnchange(value)">
<option defaultSelected>Please select an option</option>
<option value="allp">All Products</option>
<option value="milan">Products Milan</option>
<option value="juve" >Products Juventus</option>
</select>
<script>
function selectOnchange(value){
if(value === "allp"){
document.getElementById("A").disabled= true;
}
}
</script>
<select name="A" id="A">
<option defaultSelected>Please select an option</option>
<option id="mesh" value="mesh">mesh</option>
<option id="shorts" value="shorts">shorts</option>
<option id="socks" value="socks">socks</option>
</select>
<input type="submit" value="Filter" id="filtrogo" >
</form>

Select options from only one item, jquery change each

So I'm trying to build a quickbuy of products with different variants in my list of products. The product has a set of avaialble options, that are collected from the select option with jQuery, passed to a input field and then submitted to the cart. The products are listed out by a loop. When I'm at the single product page it works fine, since all the option values are required.
But once in the list of products, it gets the options from all the products and passes them to all the submit fields. How can I scope a jquery function to work on only one product at a time
In the example below, I want the field to have only the values from the select options relevant to the product. Not th evalues from both product options.
$(document).ready(function() {
$(".variant-selected")
.change(function() {
var str = "";
$("select option:selected").each(function() {
str += $(this).val() + ".";
});
$("input[name='variant']").val(str.slice(0, -1));
})
.trigger("change");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="prod1">
<h2>
Shirt
</h2>
<select class="variant-selected" name="select1">
<option value="1" selected>Red</option>
<option value="2">Blue</option>
<option value="3">Green</option>
</select>
<select class="variant-selected" name="select2">
<option value="A" selected>Large</option>
<option value="B">Medium</option>
<option value="C">Small</option>
</select>
<form class="addtocart">
<input type="text" value="" name="variant">
</form>
</div>
<div id="prod2">
<h2>Jeans
</h2>
<select class="variant-selected" name="select1">
<option value="4" selected>Orange</option>
<option value="5">Teal</option>
<option value="6">Forest</option>
</select>
<select class="variant-selected" name="select2">
<option value="D" selected>Large</option>
<option value="E">Medium</option>
<option value="F">Small</option>
</select>
<form class="addtocart">
<input type="text" value="" name="variant">
</form>
</div>

here you have
$(document).ready(function() {
$(".variant-selected")
.change(function() {
var str = "";
$(this).parent().find("select option:selected").each(function() {
str += $(this).val() + ".";
});
$(this).parent().find("input[name='variant']").val(str.slice(0, -1));
})
.trigger("change");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="prod1">
<h2>
Shirt
</h2>
<select class="variant-selected" name="select1">
<option value="1" selected>Red</option>
<option value="2">Blue</option>
<option value="3">Green</option>
</select>
<select class="variant-selected" name="select2">
<option value="A" selected>Large</option>
<option value="B">Medium</option>
<option value="C">Small</option>
</select>
<form class="addtocart">
<input type="text" value="" name="variant">
</form>
</div>
<div id="prod2">
<h2>Jeans
</h2>
<select class="variant-selected" name="select1">
<option value="4" selected>Orange</option>
<option value="5">Teal</option>
<option value="6">Forest</option>
</select>
<select class="variant-selected" name="select2">
<option value="D" selected>Large</option>
<option value="E">Medium</option>
<option value="F">Small</option>
</select>
<form class="addtocart">
<input type="text" value="" name="variant">
</form>
</div>

HTML form with checkbox options to select fieldset

I have a form that is like the following:
<label>
scale a<input type="radio" name="sellorbuy" value="Yes" id="rdYes" />
</label>
<label class="leftspace">
scale b<input type="radio" name="sellorbuy" value="No" id="rdNo" />
</label>
<p class="searchpg">Price</p>
<fieldset id="sell">
<select id="pricemin" name="minsell" class="form-control">
<option value="50000">Min Price</option>
<option value="100000">£100,000</option>
<option value="200000" >£200,000</option>
<option value="300000" >£300,000</option>
<option value="400000" >£400,000</option>
</select>
<select id="pricemax" name="maxsell" class="form-control">
<option value="5000000">Max Price</option>
<option value="100000">£100,000</option>
<option value="200000">£200,000</option>
<option value="300000">£300,000</option>
<option value="400000">£400,000</option>
<option value="500000">£500,000</option>
</select>
</fieldset>
<fieldset id="let" style="display:none;">
<select id="lpricemin" name="minbuy" class="form-control">
<option value="500">Min Price</option>
<option value="500">£500</option>
<option value="600">£600</option>
<option value="700">£700</option>
<option value="800">£800</option>
<option value="900">£900</option>
</select>
<select id="lpricemax" name="maxbuy" class="form-control">
<option value="5000">Max Price</option>
<option value="600">£600</option>
<option value="700">£700</option>
<option value="800">£800</option>
<option value="900">£900</option>
<option value="1000">£1000</option>
<option value="1150">£1150</option>
</select>
</fieldset>
This switches fieldsets by using the following:
$("input[name='sellorlet']").change(function () {
$("#sell").toggle(this.value == "Yes");
$("#let").toggle(this.value == "No");
});
The trouble I am having is the search form that is submitted and displayed on the next page so we carry over the contents of the form. If someone has selected the 'Scale B' then that is already toggled on the next page but the fieldset has not changed? Is there any way to change to the jquery to detect which checkbox is toggled and change the fieldset accordingly or even modify the switch to make it work better?
Created a fiddle to show how the form works https://jsfiddle.net/v3waaa20/1/

Some slight changes and triggering change on load can do the trick.
$("input[name='sellorbuy']").change(function () {
value = $("input[name='sellorbuy']:checked").val();
$("#sell").toggle(value == "Yes");
$("#let").toggle(value == "No");
}).change();

Javascript - Toggle html5 required="" attribute based on form selection

I have a script that's almost complete but I can't figure out the last piece. The Javascript makes the check box appear or disappear based on the drop down selection (this is working great). But I'm trying to make the check box "Required" if the checkbox is present (the part I can't figure out).
I'm using the htm5 required="" attribute on the check box field, but the form still tries to validate it even with the 3rd option selected, which hides the check box altogether.
Is there a way to toggle on/off the required="" in coordination with the selection of the drop down, or any other suggestions?
<script>
function getTerms(select){
var selectedString = select.options[select.selectedIndex].value;
if(selectedString == "1" || selectedString == "2")
{
document.getElementById("terms_target").style.display = "block";
}else {
document.getElementById("terms_target").style.display = "none";
}
}
</script>
<form action="process_affiliate.php" method="post" onchange="getTerms(this)" >
<select name="InquiryType" required="">
<option value="">Please Select Your Inquiry Type</option>
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
<div id="terms_target" style="display:none;">
<input type="checkbox" name="checked" value="Checked" required="" />I agree to the terms
</div>
<input type="submit" value="Submit">
</form>

Here is a newer version using addEventListener
window.addEventListener("DOMContentLoaded", () => {
const sel = document.querySelector("[name=InquiryType]"),
terms = document.getElementById("terms_target"),
form = document.getElementById("myForm"),
agree = form.checked; // checked is a poor name for a field
toggleAgree = () => {
const show = ["1", "2"].includes(sel.value);
terms.hidden = !show;
agree.required = show;
};
sel.addEventListener("change", toggleAgree)
toggleAgree(); // initialise
})
<form action="process_affiliate.php" id="myForm" method="post">
<select name="InquiryType" required>
<option value="">Please Select Your Inquiry Type</option>
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
<div id="terms_target" hidden>
<input type="checkbox" name="checked" value="Checked" required="" />I agree to the terms
</div>
<input type="submit" value="Submit">
</form>
Older version
window.onload=function() {
var sel = document.getElementsByName("InquiryType")[0];
sel.onchange=function() {
var selectedString = this.value,
show = selectedString == "1" || selectedString == "2",
terms = document.getElementById("terms_target"),
checked=document.getElementsByName("checked")[0];
terms.style.display = show?"block":"none";
if (show) checked.setAttribute("required","required");
else checked.removeAttribute("required");
}
sel.onchange(); // initialise
}
<form action="process_affiliate.php" method="post">
<select name="InquiryType" required="">
<option value="">Please Select Your Inquiry Type</option>
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
<div id="terms_target" style="display:none;">
<input type="checkbox" name="checked" value="Checked" required="" />I agree to the terms
</div>
<input type="submit" value="Submit">
</form>

I want to activate a textbox on selecting other option from dropdown list only else it remains inactive

I want that when I select option "others " from dropdown list then only the text box is active else that box remains inactive... I am attaching the code please help me and change the code according to my required specification.......
<div class="width-qrtr">
<label>Type of event</label>
<select name="" id= "select">
<option value="1">Select Type</option>
<option value="2">Golf Day</option>
<option value="3">Dinner</option>
<option value="4">Dinner and Golf Day</option>
<option value="5">Other</option>
</select>
</div>
<div class="width-qrtr">
<label>If you choose 'Other'</label>
<input type="text" value="" name=""/>
</div>

Here's how you do it with pure javascript...
<select name="" id= "select" onchange="onSelectChange()">
<option value="1">Select Type</option>
<option value="2">Golf Day</option>
<option value="3">Dinner</option>
<option value="4">Dinner and Golf Day</option>
<option value="5">Other</option>
</select>
<input type="text" id="yourTextBox" disabled="disabled"/>
Then in your script:
function onSelectChange(){
var sel = document.getElementById('select');
var strUser = sel.options[sel.selectedIndex].text; //getting the selected option's text
if(strUser == 'Other'){
document.getElementById('yourTextBox').disabled = false; //enabling the text box because user selected 'Other' option.
}
}

<div class="width-qrtr">
<label>Type of event</label>
<select name="selectdrop" id= "selectdrop" onchange="return Sbox();">
<option value="1">Select Type</option>
<option value="2">Golf Day</option>
<option value="3">Dinner</option>
<option value="4">Dinner and Golf Day</option>
<option value="5">Other</option>
</select>
<input type="text" id="tbox" name="tbox" disabled />
</div>
<script lanaguage="javascript">
function Sbox()
{
if(document.getElementById("selectdrop").value=='5')
{
document.getElementById("tbox").disabled=false;
}
}
</script>
Running code : http://jsfiddle.net/cvb82wtq/

<div class="width-qrtr">
<label>Type of event</label>
<select name="" id="select">
<option value="1">Select Type</option>
<option value="2">Golf Day</option>
<option value="3">Dinner</option>
<option value="4">Dinner and Golf Day</option>
<option value="5">Other</option>
</select>
</div>
<input type='text' name='othertext' id="other" disabled='disabled'/>
Script-
$(document).ready(function () {
$("#select").change(function () {
if ($(this).find("option:selected").val() == "5") {
$("#other").removeAttr("disabled")
} else {
$("#other").attr("disabled","disabled")
}
});
});
Here's the fiddle http://jsfiddle.net/vikrant47/gywg9hue/1/

Bind an event listener to the dropdown menu. When it changes, if the option selected is "Other" (value=5), enable the textbox. Otherwise, disable the textbox.
HTML:
<div class="width-qrtr">
<label>Type of event</label>
<select name="" id= "select">
<option value="1">Select Type</option>
<option value="2">Golf Day</option>
<option value="3">Dinner</option>
<option value="4">Dinner and Golf Day</option>
<option value="5">Other</option>
</select>
</div>
<div class="width-qrtr">
<label>If you choose 'Other'</label>
<input id="textbox" disabled="true" type="text" value="" name=""/>
</div>
JS:
document.getElementById('select').addEventListener('change', function() {
if (this.value == 5) {
document.getElementById('textbox').disabled = false;
} else {
document.getElementById('textbox').disabled = true;
}
});
Here's a fiddle.