Develop Reference

jQuery move select option to the second position

I have select :
<select class="selCommon" name="country_id">
<option value="">Select</option>
<option value="40">Afghanistan</option>
...
<option value="37">Switzerland</option>
...
</select>
How can I move option with text Switzerland to the second position in the list ? Result will be :
<select class="selCommon" name="country_id">
<option value="">Select</option>
<option value="37">Switzerland</option>
<option value="40">Afghanistan</option>
...
</select>

You can use jquery after() to place it after the first-child in the select - see demo below:
$('select[name=country_id] option:first-child').after($('select[name=country_id] option[value=37]'));
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="selCommon" name="country_id">
<option value="">Select</option>
<option value="40">Afghanistan</option>
<option value="37">Switzerland</option>
</select>

You can get all of the <option> elements, and then filter them by the value attribute. Finally, once you have the correct element selected (in this case for Switzerland), you can use insertBefore() to move its location in the DOM.
Example:
var $opts = $('.selCommon').children();
$opts.filter('[value="37"]').insertBefore( $opts.eq(1) )
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="selCommon" name="country_id">
<option value="">Select</option>
<option value="40">Afghanistan</option>
<option value="40">United Kingdom</option>
<option value="40">USA</option>
<option value="37">Switzerland</option>
</select>

You can also try this:
$(document).ready(function(){
var options = $('.selCommon option' );
var SwitzerlandIndex=0;
var cnt=0;
$(options).each(function(){
if($(this).text() == "Switzerland"){
SwitzerlandIndex=cnt;
}
cnt++;
});
$(options[SwitzerlandIndex]).insertAfter($(options[0]));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="selCommon" name="country_id">
<option value="">Select</option>
<option value="40">Afghanistan</option>
<option value="41">Test</option>
<option value="37">Switzerland</option>
<option value="38">Test 2</option>
</select>

You can sort on the value
$('.selCommon option').sort((a, b) => a.value - b.value).appendTo('.selCommon');
$('.selCommon').val("")
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="selCommon" name="country_id">
<option value="">Select</option>
<option value="40">Afghanistan</option>
<option value="57">Sweden</option>
<option value="37">Switzerland</option>
<option value="12">USA</option>
</select>

How can I get the value select name

I´m now beginning with programming and I need to know what text would be the value of this code. The JS code would be an "on click" event from this unfoldable list. Thanks you in advance!!
<select name="select1" data-dojo-type="dijit/form/Select">
<option value="Artesania">Artesania</option>
<option value="Banco" selected="selected">Banco</option>
<option value="Bar">Bar</option>
<option value="Bodega">Bodega</option>
<option value="Boutique">Boutique</option>
<option value="Discoteca">Discoteca</option>

var selectbox = document.getElementById('select');
selectbox.addEventListener('change', function(){
console.log(this.value);
//do whatever you want with the value
});
<select name="select1" data-dojo-type="dijit/form/Select" id='select'>
<option value="Artesania">Artesania</option>
<option value="Banco" selected="selected">Banco</option>
<option value="Bar">Bar</option>
<option value="Bodega">Bodega</option>
<option value="Boutique">Boutique</option>
<option value="Discoteca">Discoteca</option>
</select>

How to change the setected default value in a 2nd drop down list

I have two drop down list "optionone" and "optiontwo" and I want to change the default selected value from "option value=3>3" to option value=3 selected>3 when 2 is selected from my first dropdown list ("optionone")
<script>
function myFunction() {
var mylist = document.getElementById("optionone");
var myvalue = mylist.options[mylist.selectedIndex].value
if (myvalue == 2) {
//do stuff
document.getElementById("optiontwo")
//Change <option value=3>3 to <option value=3 selected>3
}
}
</script>
My drop down list
<select name="optionone" onchange="myFunction()">
<option value=1>1
<option value=2>2
<option value=3>3
<option value=4>4
<option value=5>5
<option value=6>6
</select>
<select name="optiontwo">
<option value=1>1
<option value=2>2
<option value=3>3
<option value=4>4
<option value=5>5
<option value=6>6
</select>
Which I want to change to the following when 2 is select from my first drop down list (optionone)
<select name="optiontwo">
<option value=1>1
<option value=2>2
<option value=3 selected>3
<option value=4>4
<option value=5>5
<option value=6>6
</select>
I'm a bit stuck

You have a invalid markup, <option> must be closed
There is no id attribute for second select input
You can set the value attribute instead of finding the option value using index.
value should be wrapped in quote
Instead of playing with selected attribute, setting the value will make option selected.
Instead of inline-event-binding, use addEventListener
/*
function myFunction(elem) {
document.getElementById("optiontwo").value = elem.value;
}
*/
document.getElementById('optionone').addEventListener('change', function() {
document.getElementById("optiontwo").value = this.value;
});
<select name="optionone" id="optionone" onchange="myFunction(this)">
<option value='1'>1</option>
<option value='2'>2</option>
<option value='3'>3</option>
<option value='4'>4</option>
<option value='5'>5</option>
<option value='6'>6</option>
</select>
<select name="optiontwo" id='optiontwo'>
<option value='1'>1</option>
<option value='2'>2</option>
<option value='3'>3</option>
<option value='4'>4</option>
<option value='5'>5</option>
<option value='6'>6</option>
</select>

Thanks to the above I adapted Rayon's script to update as I wanted, as follows
<script>
document.getElementById('optionone').addEventListener('change', function() {
if (this.value == 2){
document.getElementById("optiontwo").value = 3;
}
});
</script>

remove onChange="" from html
And update you code or markup like this ..
<select name="optionone" id="optionone">
<option value='1'>1</option>
<option value='2'>2</option>
<option value='3'>3</option>
<option value='4'>4</option>
<option value='5'>5</option>
<option value='6'>6</option>
</select>
<select name="optiontwo" id='optiontwo'>
<option value='1'>1</option>
<option value='2'>2</option>
<option value='3'>3</option>
<option value='4'>4</option>
<option value='5'>5</option>
<option value='6'>6</option>
</select>
and then add this javascript code
document.getElementById('optionone').addEventListener('change',
function() {
if(this.value == 2){
document.getElementById("optiontwo").value = 3;
}
});
and your problem will solve

jQuery Event when all selects inside a div have changed

If a have several selects how can i run a jquery function when all selects have changed and not just the first i choose?
I have this html:
<div class="container">
<select name="talla1" class="talla1">
<option value="none">Select</option>
<option value="S">S</option>
<option value="M">M</option>
<option value="L">L</option>
<option value="XL">XL</option>
<option value="XXL">XXL</option>
</select>
<select name="talla2" class="talla1">
<option value="none">Select</option>
<option value="S">S</option>
<option value="M">M</option>
<option value="L">L</option>
<option value="XL">XL</option>
<option value="XXL">XXL</option>
</select>
<select name="talla3" class="talla1">
<option value="none">Select</option>
<option value="S">S</option>
<option value="M">M</option>
<option value="L">L</option>
<option value="XL">XL</option>
<option value="XXL">XXL</option>
</select>
</div>
With this jQuery function:
$('.container select').change(function() {
alert('changed');
});
but this fires the alert only when change the first select and i want to do it once all selects inside the container have changed its value and i when return to default in any select run other function, was i clear enough?
thanks in advance

You can keep a record of changes on each select and use that value to see if all 3 are changed.
var eventArray = [];
$('.container select').on('change',function(){
indexOfSelect = $('.container select').index( $(this) );
if($.inArray(indexOfSelect, eventArray) == -1)
eventArray.push( '' + indexOfSelect + '' );
if(eventArray.length == $('.container select').length)
alert('All changed');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div class="container">
<select name="talla1" class="talla1">
<option value="none">Select</option>
<option value="S">S</option>
<option value="M">M</option>
<option value="L">L</option>
<option value="XL">XL</option>
<option value="XXL">XXL</option>
</select>
<select name="talla2" class="talla1">
<option value="none">Select</option>
<option value="S">S</option>
<option value="M">M</option>
<option value="L">L</option>
<option value="XL">XL</option>
<option value="XXL">XXL</option>
</select>
<select name="talla3" class="talla1">
<option value="none">Select</option>
<option value="S">S</option>
<option value="M">M</option>
<option value="L">L</option>
<option value="XL">XL</option>
<option value="XXL">XXL</option>
</select>
</div>

Change your jquery code to this :
$(".talla1").each(function(){
$(this).change(function(){
//alert('called');
$(this).addClass('active');
if($(".container").find('.active').length == $(".talla1").length){
alert('finish');
}
});
});
Here is the working fiddle.
Do tell if it worked.
Happy Coding.

when a class is added to multiple elements its event is binded to every element and the class works for all. simply give a common class to all your select on which you want to fire a event
<script>
$(document).ready(function() {
change_count = 0;
$("select.talla1").on('change', function(event) {
change_count++;
if($("select.talla1").length == change_count){
alert("all changed");
}
});
});
</script>
this works for all the select which has class talla1

How to select selected value from multiple option using javascript

I have multiple select topion.
And I need to show the selected values.with the data of '2,4,5;
<select id="testID" multiple="multiple">
<option value="1">test Value1</option>
<option value="2">test Value2</option>
<option value="3">test Value3</option>
<option value="4">test Value4</option>
<option value="5">test Value5</option>
<option value="6">test Value6</option>
</select>
Can I use this code to get what I need.
<script type="javascript">
$(document).ready(function() {
var val_to_select = '2,4,5';
$( '#testID' ).val( val_to_select );
)};
</script>
I need output to be like this
<select id="testID" multiple="multiple">
<option value="1">test Value1</option>
<option value="2" selected>test Value2</option>
<option value="3">test Value3</option>
<option value="4" selected>test Value4</option>
<option value="5" selected>test Value5</option>
<option value="6">test Value6</option>
</select>

you can pass the value in an array like this
$("#testID").val([1,2,3]);
JsFiddle

You can use this:
var data="1,2,4";
//Make an array
var dataarray=data.split(",");
// Set the value
$("#testID").val(dataarray);
// Then refresh
$("#testID").multiselect("refresh");
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="testID" multiple="multiple">
<option value="1">test Value1</option>
<option value="2">test Value2</option>
<option value="3">test Value3</option>
<option value="4">test Value4</option>
<option value="5">test Value5</option>
<option value="6">test Value6</option>
</select>
Also your code is not javascript but jquery.