Develop Reference

Filter <SELECT> options based on value

I have 2 input selects
Country and Cars
This is the structure: [https://jsfiddle.net/CornerStone20/r1eanhwv/6/][1]
JSFIDDLE: [1]: https://jsfiddle.net/CornerStone20/r1eanhwv/6/
When I select Country, How do I only show the selected country's cars?
I have tried:
$(function() {
$('#Country_Select').on('change', function() {
var val = this.value;
$('#Cars_Select option').hide().filter(function() {
return this.value.indexOf( val + '_' ) === 0;
})
.show();
})
.change();
});

You can use each loop to iterate through options and check if the value of car select- box is same as country select-box depending upon this show() or hide() options .
Demo Code :
$(function() {
$('#Country_Select').on('change', function() {
var val = this.value;
$('#Cars_Select option').each(function() {
//checking value of opton in cars selct is same
if ($(this).val() == val) {
$(this).show(); //show it
} else {
$(this).hide(); //hide other
}
})
})
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
// Country select
<select id="Country_Select" class="form-control">
<option selected="true" disabled="false">Choose Country</option>
<option value="0001">France</option>
<option value="8ebd9ec1-b121-44e9-a530-42f227359913">Germany</option>
<option value="4dda2683-83c6-48c8-af9b-0a96991b7c8b">New Zealand</option>
</select>
// Cars
<select id="Cars_Select" class="form-control">
<option selected="true" disabled="false">Choose Cars</option>
<option value="0001">Renauld</option>
<option value="0001">Mini</option>
<option value="0001">Paris</option>
<option value="8ebd9ec1-b121-44e9-a530-42f227359913">BMW</option>
<option value="8ebd9ec1-b121-44e9-a530-42f227359913">Audi</option>
<option value="8ebd9ec1-b121-44e9-a530-42f227359913">Mercedes</option>
<option value="8ebd9ec1-b121-44e9-a530-42f227359913">Benz</option>
<option value="4dda2683-83c6-48c8-af9b-0a96991b7c8b">Kiwi Auto</option>
</select>

Even though the question has been answered, I am writing a better approach here:
$('#Country_Select').on('change', function(e) {
let cars = $('#Cars_Select').children();
cars.hide();
let country = $(this).val();
cars.filter('[value=' + country + ']').add(cars.eq(0)).show();
});

Change selected option value in dropdown

My dropdown looks like,
<select name="speed" id="ddlCustomer" class="form-control select-basic">
<optgroup label="CustomerId OrderDate SupplyDate Supplier">
<option value="1011_2">1011 2015-12-18 2015-12-22 ABC</option>
<option value="1011_2">1034 2015-12-23 2015-12-28 XYZ</option>
</optgroup>
</select>
Currently the dropdown shows options like "1011 2015-12-18 2015-12-22 ABC", that is fine but when user selects an option, I need to show only "CustomerId" i.e, 1011 in this case.
Your help is really appreciated. Thanks
Added script for focusout
customSelect.focusout(function () {
customSelectOptions.each(function (options) {
if ($(this).is(':selected')) {
$(this).text($(this).attr('value').split('_')[0]);
$(this).blur();
}
});
});

var states = [];
var customSelect = $('#ddlCustomer');
var customSelectOptions = customSelect.children().children();
// Get each state then push them to the array
// Initial state declaration
customSelectOptions.each(function() {
var state = $(this).text();
states.push({ state: state });
if ($(this).is(':selected')) {
$(this).text($(this).attr('value').split('_')[0]);
}
});
// On focus, always retain the full state name
customSelect.on('focus', function() {
customSelectOptions.each(function(index) {
$(this).text(states[index].state);
});
// On change, append the value to the selected option
$(this).on('change', function() {
customSelectOptions.each(function(options) {
if ($(this).is(':selected')) {
$(this).text($(this).attr('value').split('_')[0]);
}
});
// Un-focus select on finish
$(this).blur();
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="speed" id="ddlCustomer" class="form-control select-basic">
<optgroup label="CustomerId OrderDate SupplyDate Supplier">
<option value="1011_2">1011 2015-12-18 2015-12-22 ABC</option>
<option value="1034_2">1034 2015-12-23 2015-12-28 XYZ</option>
</optgroup>
</select>

Try like this.You have use regex with text value of selected option.
var ddlCustomer = document.querySelector('#ddlCustomer');
ddlCustomer.addEventListener('change',function(){
text = $(this).find("option:selected").text();
var value = text.match(/[0-9]+/);
$(this).find("option:selected").text(value);
alert(value);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="speed" id="ddlCustomer" class="form-control select-basic">
<optgroup label="CustomerId OrderDate SupplyDate Supplier">
<option value="1011_2">1011 2015-12-18 2015-12-22 ABC</option>
<option value="1011_2">1034 2015-12-23 2015-12-28 XYZ</option>
</optgroup>
</select>
See fiddle here https://jsfiddle.net/88cozeaz/1/

document.getElementById('#ddlCustomer').onchange = function() {
var option = this.options[this.selectedIndex];
option.setAttribute('data-text', option.text);
option.text =$(this).val();
// Reset texts for all other but current
for (var i = this.options.length; i--; ) {
if (i == this.selectedIndex) continue;
var text = this.options[i].getAttribute('data-text');
if (text) this.options[i].text = text;
}
};

select anyone optgroup at the same time in custom javascript

Fiddle Link
I have two types of optgroup with option.
I need to validate between two groups. How to do that ?
Case 1
If i select the A optgroup.simuultanseuly i cant able to select optgroup B
i need to select any one. can't select both at the same time.
Javascript
$('#select').change(function () {
var selectedOption = $('#select option:selected');
var label = selectedOption.closest('optgroup').attr('label');
var selectText = selectedOption.text();
if(label == 'A'){ $('.selectoption').val(label); }
var length = $(this).find(':selected').text().length;
$('')
if(label== 'A'){
alert('check');
} else {
alert('no test');
}
// if (length < 2) {
//$(this).find(':selected').text(label + ' - ' + selectText);
//}
});

You can use element.prop('disabled', boolean) to disable / enable the form elements.
You can disable the other optgroup using the above technique like this:
$(function(){
$('#select').change(function () {
$('optgroup').prop('disabled', false);
$('optgroup').removeClass('selected');
var selectedOption = $('#select option:selected');
$(".selectoption").val(selectedOption.closest('optgroup').attr('label'));
selectedOption.closest('optgroup').addClass('selected');
var label = selectedOption.closest('optgroup').attr('label');
var selectText = selectedOption.text();
$(this).find('optgroup').each(function(i) {
if(!$(this).hasClass('selected')) {
$(this).prop('disabled', true);
} else {
$(this).prop('disabled', false);
}
});
});
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="select" multiple style="height:150px;width:150px;">
<optgroup label="A">
<option value="">1</option>
<option value="">2</option>
<option value="">3</option>
</optgroup>
<optgroup label="B">
<option value="">4</option>
<option value="">5</option>
<option value="">6</option>
</optgroup>
</select>
<input type="text" name="selectoption" class="selectoption" value="" />

jQuery - Restore the removed select option

I have multiple dropdown menus with the same options. If one option was selected, other dropdown menus will not show the selected option. When I tried to reset the selected option, it did not restore the removed select option.
HTML part:
<select id="selectNumber" class="selectbox">
<option value="0">Choose a number</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
<select id="selectNumber2" class="selectbox">
<option value="0">Choose a number</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
Javascript part:
$(".selectbox").change(function(){
var selectedIndex = $(this).index();
var myVal = $(this).val();
$(".selectbox").each(function(i){
if (selectedIndex != i){
$("option", this).each(function(){
if (myVal == $(this).val() && myVal != 0){
$(this).detach();
}else{
$(this).prepend();
//not work
}
});
}
});
});
the demo but not working
Thanks for your time.

This should do what you want
/* store options */
var $selects = $(".selectbox");
var $opts = $selects.first().children().clone();
$selects.change(function () {
var myVal = $(this).val();
if (myVal !='0') {
$selects.not(this).children('[value="'+myVal+'"]').remove();
}else{
var replaceVal=$(this).data('currVal');
$selects.not(this).append( $opts.filter( '[value="'+replaceVal+'"]').clone())
}
$(this).data('currVal', myVal);
});
DEMO http://jsfiddle.net/7Ssu7/8/
EDIT Version - keeps sort order
/* store options */
var $selects = $(".selectbox");
var $opts = $selects.first().children().clone();
$selects.change(function () {
/*create array of all selected values*/
var selectedValues=$selects.map(function(){
var val=$(this).val();
return val !=0? val :null;
}).get();
$selects.not(this).each(function(){
var $sel=$(this), myVal=$sel.val() ||0;
var $options=$opts.clone().filter(function(i){
var val=$(this).val();
return val==myVal || $.inArray(val, selectedValues) ==-1;
});
$sel.html( $options).val( myVal)
});
});
DEMO: http://jsfiddle.net/8uunN/1/

When you do a detach(), the object is removed and needs to be put into a "global" variable to save as a reference.
For your purpose, you can use .hide() and .show() as it retains the object in the list, without causing a DOM insertion or removal (so definitely better for performance).

Well, your current code is not work, because you are not store selected value in another dropdown list. Also, like others said, use hide and show instead of detach and prepend.
You can see my solution in jsfiddle (tested in firefox)

option is still visible in select after remove()

Hi all I have two select fields, on select field first if user select option value one or two then in select field of second all options are visible but if it select option two in first then option two want to remove from select id second. Following is my code:
<script type="text/javascript">
var index3,str;
</script>
<select id="first" onchange="chk();">
<option value = "one">one</option>
<option value = "two">two</option>
<option value = "three">three</option>
</select>
<select id="second">
<option value = "one">one</option>
<option value = "two">two</option>
<option value = "three">three</option>
</select>
<script type="text/javascript">
function chk()
{
index3 = document.getElementById("first");
str= index3.options[index3.selectedIndex].value;
alert("str:"+str);
if (str=="two")
{
$("#second option[value='two']").remove();
}
else
{
if ( $("#second option[value='two']").length == 0 )
{
$("#second").append('<option value="two">two</option>');
}
}
}
</script>
In fiddle it works fine here, But on mobile problem is: If I select option two from select id second, and then select option value two in first select id, then also option two is visible in second select id, if I click on second select id then only it removes. But in jsFiddle it works perfect. Any suggestion will be appreciated, Thanks in advance.

Here i have done complete bin for above issue. please go through demo link.
Demo http://codebins.com/bin/4ldqp7p
HTML
<select id="first">
<option value = "one">
one
</option>
<option value = "two">
two
</option>
<option value = "three">
three
</option>
</select>
<select id="second">
<option value = "one">
one
</option>
<option value = "two">
two
</option>
<option value = "three">
three
</option>
</select>
jQuery
$(function() {
$("#first").change(function() {
var optVal = $(this).val().trim();
if (optVal == "two") {
$("#second").find("option[value=" + optVal + "]").remove();
} else {
if ($("#second").find("option[value=two]").length <= 0) {
$("<option value=\"two\">two</option>").insertAfter($("#second").find("option[value='one']"));
}
}
});
});
Demo http://codebins.com/bin/4ldqp7p

check this Edit
$('#first').change(function() {
$("#second option[value='" + $(this).val() + "']").remove();
});

Your code looks a bit odd overall. If your intention is to remove the item from 'second' if it is selected in 'first', try this update: http://jsfiddle.net/NWbXt/58/
$(function() {
var first = $('#first'),
second = $('#second'),
removed;
first.change(function() {
var selected = first.val();
second.append(removed); //.. add back old option
removed = second.find('option[value="' + first.val() + '"]').remove();
}).trigger('change');
});​