how to change class of dropdown when select an option dynamically - javascript

This is the code :
<select class="dd-select" name="UM_Status_Engraving" id="UM_Status_Engraving" onchange="colourFunction(this)">
<option class="dd-select" value="SELECT">SELECT</option>
<option class="dd-ok" value="OK">OK</option>
<option class="dd-notok" value="NOT OK">NOT OK</option>
</select>
onchange="colourFunction(this)" sets a class to dropdown of selected option, it works when I select an option of dropdown, but when I set the option dynamically, it does not call onchange so option class does not set to dropdown... some one help...


When you change the value of the select, also trigger change() by yourself.
function colourFunction(ele){
console.log(ele.value)
}
$('#UM_Status_Engraving').val('OK').trigger('change')
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="dd-select" name="UM_Status_Engraving" id="UM_Status_Engraving" onchange="colourFunction(this)">
<option class="dd-select" value="SELECT">SELECT</option>
<option class="dd-ok" value="OK">OK</option>
<option class="dd-notok" value="NOT OK">NOT OK</option>
</select>

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In a dropdown box, How can I verify that the selected value is selected inside the dropdown
<select id="myselect">
<option value="1">Mr</option>
<option value="2">Mrs</option>
<option value="3">Ms</option>
<option value="4">Dr</option>
<option value="5">Prof</option>
</select>
expect(await helper.getElementText("#myselect").to.equal("Mr")
does not work as even having the value selected the dropdown x path does not change.

Javascript add new select index with data from database

I want to create a selection that triggers another selection to select data from the database when the first selection is selected.
<select id="brandSelect">
<option value="10">Pilih Brand</option>
<option value="20">AMD</option>
<option value="30">Intel</option>
</select>
How to take the data from the database if option 1, 2, or 3 is selected, and the second selection option has a value in it? And if the user changes the option, the second selection index is reset.

Here's the code with Javascript Vanilla:
<body>
<select id="brandSelect" onchange="optionSelected(this.value)">
<option value="10">Pilih Brand</option>
<option value="20">AMD</option>
<option value="30">Intel</option>
</select>
</body>
<script>
function optionSelected(value) {
alert(value)
// DO Database Fetch Code Here
}
</script>
And I will tell you there is a good website, we might not need jQuery.

In the bellow Code, by changing the #brandselect you can triger change on the other select. I put specific value. You can add the value you want there.
$(document).on('change', '#brandSelect', function() {
// Here you change the selection of the other Select
$('#graphs').val("20");
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="brandSelect">
<option value="10">Pilih Brand</option>
<option value="20">AMD</option>
<option value="30">Intel</option>
</select>
<select id="graphs">
<option value="10">AMD</option>
<option value="20">NVidia</option>
</select>

$(document).on('change', '#brandSelect', function() {
// Here you change the selection of the other Select
$('#brandSelect2').val("2");
$('#brandSelect2').trigger("change");
})
$(document).on('change', '#brandSelect2', function() {
// Here you change the selection of the other Select
alert();
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="brandSelect">
<option value="10">Pilih Brand</option>
<option value="20">AMD</option>
<option value="30">Intel</option>
</select>
<select id="brandSelect2">
<option value="1">test1</option>
<option value="2">test2</option>
</select>
first you need to handle change event and from based on that you can handle second dropdown change event.
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="brandSelect">
<option value="10">Pilih Brand</option>
<option value="20">AMD</option>
<option value="30">Intel</option>
</select>
<select id="brandSelect2">
<option value="1">test1</option>
<option value="2">test2</option>
</select>
<script>
$(document).on('change', '#brandSelect', function() {
$('#brandSelect2').val("2");
$('#brandSelect2').trigger("change");
})
$(document).on('change', '#brandSelect2', function() {
//here you can use ajax call to fetch data from database.
alert();
})
</script>

Jquery change multiple select buttons with a select button

I want to change multiple select buttons's values with another select button.
Practically when someone select an option in the main select button, the other select buttons must change with that value.
EDIT: I added the code, the first is the main select button and after I select somethig there, it should change in the others.
<select class="select_format">
<option value="0.49">9x13</option>
<option value="0.59">10X15</option>
<option value="0.99">13X18</option>
<option value="1.20">15X21</option>
<option value="2.60">20X30</option>
</select>
<select name="format[]" class="format_imgs">
<option value="0.49">9x13</option>
<option value="0.59">10X15</option>
<option value="0.99">13X18</option>
<option value="1.20">15X21</option>
<option value="2.60">20X30</option>
</select>
<select name="format[]" class="format_imgs">
<option value="0.49">9x13</option>
<option value="0.59">10X15</option>
<option value="0.99">13X18</option>
<option value="1.20">15X21</option>
<option value="2.60">20X30</option>
</select>
<select name="format[]" class="format_imgs">
<option value="0.49">9x13</option>
<option value="0.59">10X15</option>
<option value="0.99">13X18</option>
<option value="1.20">15X21</option>
<option value="2.60">20X30</option>
</select>
Thanks.

Since you didn't supply code here's a guess:
$(".myTriggerButton").on("click", function() {
$(".buttonToChangeValue").each(function() {
this.value = "new value";
});
});

$('.select_format').change(function(){
$('.format_imgs').val( $(this).val() );
});
https://jsfiddle.net/7hno0ob8/1/

JQuery change selected="true" on select - angularjs

I have this select on my page:
<select id="myselect">
<option value="car" selected="true">Car</option>
<option value="bike">Bike</option>
<option value="plane">Plane</option>
</select>
I need the selected option to be bike ... how do I change it using jQuery?
I've tried:
$("#myselect option:selected").val('bike');
and
$("#myselect").val('bike');
But they don't work

I just created a dummy button to change the selected on click of it. Here is the code
HTML
<select id="myselect">
<option value="car" selected="true">Car</option>
<option value="bike">Bike</option>
<option value="plane">Plane</option>
</select>
<button id="cS">
Change Selected
</button>
JS
$("#cS").on('click',function(){
$('#myselect option[value="bike"]').attr('selected',true)
})
WORKING EXAMPLE

How can I move a select element's values & text to another select element

I want to get the <option> values and text from a <select> element #myselect, and add it to another <select> element #newselect. The value and text passed to the second select element, #newselect, must also be disabled. I'd like support for IE 8+.
<select id="myselect">
<option value="1">Red</option>
<option value="2">Orange</option>
<option value="3">Yellow</option>
</select>
Take the above, disable them and add them to the below:
<select id="newselect">
<option value="1">Green</option>
<option value="2">Blue</option>
<option disabled value="1">Red</option>
<option disabled value="2">Orange</option>
<option disabled value="3">Yellow</option>
</select>

Since you included the jQuery tag, here's a jQuery solution.
As long as you're using jQuery 1.x, IE8 support is included.
$('#myselect option').each(
function() {
$(this).prop('disabled', true).appendTo('#newselect');
}
);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<select id="myselect">
<option value="1">Red</option>
<option value="2">Orange</option>
<option value="3">Yellow</option>
</select>
<select id="newselect">
<option value="1">Green</option>
<option value="2">Blue</option>
</select>

You already have jQuery answer. So now if you are curious how it can be in pure javascript, here it is. As you can see, it's a little more verbose of course:
var mySelect = document.getElementById('myselect'),
newSelect = document.getElementById('newselect');
while (mySelect.options.length) {
mySelect.options[0].disabled = true;
newSelect.add(mySelect.options[0]);
}
<select id="myselect">
<option value="1">Red</option>
<option value="2">Orange</option>
<option value="3">Yellow</option>
</select>
<select id="newselect">
<option value="1">Green</option>
<option value="2">Blue</option>
</select>

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