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How to select multiple options if check option from a different select?

I want select multiple option from second select depending on check option from first select.
For example:
adiunkt -> mikroklimat, RTG
agent celny -> zapylenie
First select:
<select name="form[stanowisko][]" id="stanowisko">
<option value="adiunkt">adiunkt</option>
<option value="agent celny">agent celny</option>
</select>
Second select:
<select multiple="multiple" name="form[czynniki_szkodliwe][]" id="czynniki_szkodliwe">
<option value="mikroklimat">mikroklimat</option>
<option value="RTG">RTG</option>
<option value="zapylenie">zapylenie</option>
</select>
I tried this but it not working (select all options after first check):
function tes(){
if (document.getElementById('stanowisko').value ="agent celny") {
document.getElementById('czynniki_szkodliwe').options[2].selected = true;
document.getElementById('czynniki_szkodliwe').options[0].selected = true;
}
if ( document.getElementById('stanowisko').value="adiunkt") {
document.getElementById('czynniki_szkodliwe').options[1].selected = true;
}
}

Pure js solution.
let elem1 = document.getElementById('stanowisko'),
elem2 = document.getElementById('czynniki_szkodliwe');
elem1.addEventListener('change', (e) => {
Array.from(elem2.children).forEach(v => {
return v.disabled = v.getAttribute('data-attr') !== e.target.value;
})
});
<select name="form[stanowisko][]" id="stanowisko">
<option value="">-</option>
<option value="adiunkt">adiunkt</option>
<option value="agent celny">agent celny</option>
</select>
<select multiple="multiple" name="form[czynniki_szkodliwe][]" id="czynniki_szkodliwe">
<option value="mikroklimat" disabled data-attr='adiunkt'>mikroklimat</option>
<option value="RTG" disabled data-attr='adiunkt'>RTG</option>
<option value="zapylenie" disabled data-attr='agent celny'>zapylenie</option>
</select>

You should use a data attribute to mark the options linked to the first select like this:
$(document).ready(function(){
$("#stanowisko").on("change", function(event){
var $options = $("#czynniki_szkodliwe option");
//Unselect all
$options.prop("selected", false);
var val = $("#stanowisko").val();
$options.each(function(idx, item) {
if($(item).data("stanowisko").indexOf(val) >= 0) {
$(item).prop("selected", true);
}
});
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="form[stanowisko][]" id="stanowisko">
<option value="">Choose</option>
<option value="adiunkt">adiunkt</option>
<option value="agent celny">agent celny</option>
<option vlaue="lekarz">lekarz</option>
</select>
<select multiple="multiple" name="form[czynniki_szkodliwe][]" id="czynniki_szkodliwe">
<option data-stanowisko='["adiunkt"]' value="mikroklimat">mikroklimat</option>
<option data-stanowisko='["adiunkt","lekarz"]' value="RTG">RTG</option>
<option data-stanowisko='["agent celny"]' value="zapylenie">zapylenie</option>
</select>
Edit: If several options, from the first select, refers to the same options in the second select, you can "store" an array in the data attribute in JSON format.
I updated the JS code to handle JSON array in the data attributes instead of a simple string.

How can maintain as selected the second option in a drop down with random values?

I want to always maintain how to select the second option for its drop downs. The point here is that the value is random:
MyBrowser.document.getElementById("multipleCat_1").Value = "RANDOMVALUE"
How do I select the second option in a drop down menu?
HTML:
<select id="multipleCat_1">
<option value="-1">Select</option>
<option value="RANDOMVALUE">Second Option"</option>
</select>

You can use selectedIndex as below:
document.querySelectorAll('#multipleCat_1 > option')[1].value = 'Got you!';
document.getElementById('multipleCat_1').selectedIndex = 1
console.log(document.getElementById('multipleCat_1').value)
<select id="multipleCat_1">
<option value="-1">Select</option>
<option value="RANDOMVALUE">Second Option"</option>
</select>

<select id="multipleCat_1">
<option value="A">AAA</option>
<option value="B">BBB</option>
<option value="C">CCC</option>
</select>
var options = document.querySelectorAll('#multipleCat_1 > option');
document.getElementById('multipleCat_1').value = options[1].value;

FadeIn fadeOut depending upon the previous option value in select [duplicate]

I have 4 Drop Downs.
Each drop by default has a --select-- option. Each box has a unique id. As you can see, the second drop down is disabled if the above drop down value is --select--. It will only enable when the value is anything but --select--
Here's my code:
$(document).ready(function() {
$('#idOfTheFirstDropDown').bind('change', function() {
var options = $(this).children('option');
var item = $('div.c-select').children().hide(); // hide all the elements
var value = Math.floor(Math.random() * options.length );
//console.log(value);
if (value.length) { // if selected
item.show(); // show the next dropdown
}
}).trigger('change');
});
I want it to show the next dropdown only when my previous drop down value is not --select--. My code is taking in the first drop down but not changing the value. What am I doing wrong? Thanks.
My HTML for one drop down box. Only the ID's change for the remaining 3. Rest of the HTML remains the same.
<div class="c-select">
<select name="list1" onchange="javascript:setTimeout('__doPostBack(\'list1\',\'\')', 0)" id="idOfTheFirstDropDown" class="GroupDD dropDown ">
<option selected="selected" value="">-- Select --</option>
<option value="1">Group1</option>
</select>
</div>

Rather than hiding the options, I would use the disable attribute (comments in code):
var selects = $('.drop-down');
selects.not(':eq(0)').prop('disabled', true); // disable all but first drop down
selects.on('change', function() {
var select = $(this),
currentIndex = selects.index(select),
nextIndex = currentIndex + 1;
// only do this if it is not last select
if (currentIndex != selects.length - 1) {
selects.slice(nextIndex) // get all selects after current one
.val('') // reset value
.prop('disabled', true); // disable
selects.eq(nextIndex).prop('disabled', select.val() === ''); // disable / enable next select based on val
}
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="drop-down">
<option value="">--Select--</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select><br>
<select class="drop-down">
<option value="">--Select--</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select><br>
<select class="drop-down">
<option value="">--Select--</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select><br>
<select class="drop-down">
<option value="">--Select--</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>

Check this one;
HTML code:
<select id="sel-1"></select>
<select id="sel-2"></select>
<select id="sel-3"></select>
<select id="sel-4"></select>
JS Code:
$(document).ready(function(){
$("[id^=sel]").change(function(){
/*
* find out the current box id
*/
var id=$(this).attr("id");
/*
* find out the current box id order number
*/
var ordernumber=id.split("-")[1];
if($(this).val()!="select")
{
//enable next one
$("#sel-"+(ordernumber+1)).show();
}
})
})

Assuming the option that has '--select--' as text has no value, just use val on the handler to check if the selected option is other than the empty
if(this.val() !== '') {
// enable following select
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<style>
select {
margin: 5px 0;
display: block;
}
</style>
<script>
$(function() {
$('.cls-select').change(function() {
if ($(this).val() == '--select--') {
// reset and disable the next drop downs
$('.cls-select:gt(' + $('.cls-select').index($(this)) + ')').val('--select--').prop('disabled', true)
} else {
// current drop down has value so enable the next drop down
$(this).next().prop('disabled', false);
}
});
})
</script>
<select class="cls-select">
<option>--select--</option>
<option>one</option>
<option>two</option>
</select>
<select class="cls-select" disabled>
<option>--select--</option>
<option>one</option>
<option>two</option>
</select>
<select class="cls-select" disabled>
<option>--select--</option>
<option>one</option>
<option>two</option>
</select>
<select class="cls-select" disabled>
<option>--select--</option>
<option>one</option>
<option>two</option>
</select>

multiple select boxes with same options - require unique selection

I have a form with 3 select boxes. Each select box has the same options. I want to require that you have to select a different option for each select box. For example, let's say the options are "cat", "dog" and "bird". If someone selects "bird" in the first select box, I want to disable or hide that option from the other two boxes. If they change their selection, then "bird" will be enabled or unhidden again.
<select id="box1">
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
<select id="box2">
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
<select id="box3">
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
I assume I can do this with jquery onchange but I'm not sure how to require the unique selection across different select boxes.
$('select').on('change', function() {
// If option is selected, disable it in all other select boxes. If option is deselected, reenable it in all other select boxes.
})
Thanks for your help!

1) Top To Bottom Priority Approach
The flow must be top to bottom. This also means when ever the user changes the dropdown value all the next dropdown's which come after it must be reset. Having said this, here is my code snippet.
HandleDropdowns($('#box1')); //initially call this function to handle the dropdowns by passing the first dropdown as parameter
$('select').on('change', function() {
HandleDropdowns($(this)); // handle all dropdowns on any change event.
});
function HandleDropdowns(element) {
var $element = element;
var value = $element.val();
$element.nextAll().val(''); //using nextAll lets reset all the following dropdowns
$element.nextAll().attr('disabled', 'disabled'); //disable all the following dropdowns.
HandleOptions(); // call this function to toggle the options
if (value.length) {
$element.next().removeAttr('disabled'); // only if this dropdown has some selection enable the next dropdown.
}
}
function HandleOptions() {
$('option').removeAttr('disabled'); //reset all the options to be available
$.each($('select'), function() { //loop from top to bottom and disable the options one by one.
var value = $(this).val();
if (value.length) {
$(this).nextAll().find('option[value="' + value + '"]').attr('disabled', 'disabled');
}
});
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="box1">
<option value="">Select</option>
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
<select id="box2">
<option value="">Select</option>
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
<select id="box3">
<option value="">Select</option>
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
2) All Select Box With Same Priority Approach
In this approach when ever the user selects a value we check if any other dropdown has the same value, If yes reset it else do nothing. Below is a working sample.
$('select').on('change', function() {
HandleDropdowns($(this));
});
function HandleDropdowns(element) {
var $element = element;
var value = $element.val();
$.each($('select').not($element), function() { //loop all remaining select elements
var subValue = $(this).val();
if (subValue === value) { // if value is same reset
$(this).val('');
console.log('resetting ' + $(this).attr('id')); // demo purpose
}
});
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="box1">
<option value="">Select</option>
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
<select id="box2">
<option value="">Select</option>
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
<select id="box3">
<option value="">Select</option>
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>

Try this
$('select').on('change', function () {
$("select").find("option").removeAttr("disabled");
$("select").not(this).find("option[value=" + $(this).val() + "]").attr("disabled", "disabled");
});

You can use onchange listener and evaluate the results simultaneously. Also add an reset button cause once three get selected, it becomes bottle neck case.
The working code is given below
function changeSelect(elements) {
var values = {};
elements.forEach(function(item){
values[item.id] = item.value;
});
elements.forEach(function(item){
for(var i = 0; i < item.children.length; i++) {
for(ids in values) {
if(item.id != ids && item.children[i].value == values[ids]) {
item.children[i].style.display = 'none';
}
}
}
});
}
function resetSelection(elements) {
elements.forEach(function(item){
item.value = '';
for(var i = 0; i < item.children.length; i++) {
item.children[i].style.display = '';
}
});
}
var box1 = document.getElementById('box1');
var box2 = document.getElementById('box2');
var box3 = document.getElementById('box3');
var boxArray = [box1, box2, box3];
boxArray.forEach(function(item){
item.addEventListener('change', changeSelect.bind(undefined,boxArray));
});
document.getElementById('reset').addEventListener('click', resetSelection.bind(undefined,boxArray));
<select id="box1">
<option value="">Select An Option</option>
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
<select id="box2">
<option value="">Select An Option</option>
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
<select id="box3">
<option value="">Select An Option</option>
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="bird">Bird</option>
</select>
<button id="reset">Reset</button>

HTML multi select how to deselect all if select first item using jquery

I have a multi select control look like below,
When user select "Any", I want to deselect all other selected values and select only "Any", means, if user select "Any", do not allow to select other values else allow to select other values.
How its possible through jQuery
Thanks...

jQuery("#select").change(function() {
if (jQuery("#select option:first").is(':selected')) {
jQuery("#select").val("any");
}
});
To the form below:
<select multiple id="select">
<option value="any">Any</option>
<option value="...">...</option>
...
</select>

I think you want something like this:
$("select").on("change", function () {
var selOption = $("option:selected", this).val();
if (selOption == "any") {
$(this).attr("selected", false);
$(this).val("any");
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="select2" multiple="multiple">
<option value="any">Any</option>
<option value="12">twelve</option>
<option value="13">thirette</option>
<option value="14">fourteen</option>
<option value="15">fifteen</option>
<option value="16">sixteen</option>
<option value="17">seventeen</option>
<option value="18">eighteen</option>
<option value="19">nineteen</option>
<option value="20">twenty</option>
</select>

In most cases this should work
$('.my-select').val('any')
Where is ’any' is a value of Any option.
(function() {
var mSelect;
mSelect = $('select');
mSelect.on('click', function(event) {
var values, needReset;
values = mSelect.val();
needReset = event.target.value === 'any' ||
(values.length > 1 && values.indexOf('any') !== -1);
if (needReset) {
mSelect.val('any');
}
});
}());
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select multiple>
<option value="any">Any</option>
<option value="divorced">Maried</option>
<option value="unmarried">Unmarried</option>
</select>