How to call on change event of dropdown by button click

Question

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How to made on change event by clicking button

<select name="dropdown1" selected>
 
  <option value="1">Test 1</option>
  <option value="2">Test 2</option>
  <option value="3">Test 3</option>
  <option value="4">Test 4</option>
  <option value="5">Test 5</option>
</select>

<select name="dropdown2" selected>
  
  <option value="1">Test 1</option>
  <option value="2">Test 2</option>
  <option value="3">Test 3</option>
  <option value="4">Test 4</option>
  <option value="5">Test 5</option>
</select>

$("#plus").click(function(){
var selectedItem = $($dropdown1).val();
alert(selectedItem);
    $dropdown1.on('change',function() {
    $dropdown2.empty().append($dropdown1.find('option').clone());
    //var selectedItem = $(this).val();
    if (selectedItem) {
        $dropdown2.find('option[value="' + selectedItem + '"]').remove();
    }
});
});

What I have tried:

I have tried with below code but not populating second dropdown

$("#plus").click(function(){
var selectedItem = $($dropdown1).val();
alert(selectedItem);
    $dropdown1.on('change',function() {
    $dropdown2.empty().append($dropdown1.find('option').clone());
    //var selectedItem = $(this).val();
    if (selectedItem) {
        $dropdown2.find('option[value="' + selectedItem + '"]').remove();
    }
});
});

<button id="plus" value="+">+</button>

But the second drown list item Test 1 is not removed.

Posted 12-May-17 8:15am

DGKumar

Updated 15-May-17 20:39pm

v2

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njammy · Answer 1 · 2017-05-12T08:35:00

Solution 1

Move your code :
$dropdown1.on('change'...

to outside of the $("#plus").click(...
function.
If you refer to the jQuery documentation the $object.on function is a expression binding so when called in your code currently, it's only binding it but not calling it.

Posted 12-May-17 8:35am

njammy

Ramesh Kumar Barik · Answer 2 · 2017-05-15T20:39:00

You need to trigger the dropdownlist change event from your button click event.

$("#plus").click(function(){
//Your code.
//trigger code

$('#YourDDLId').trigger('change');

});

// Write your dropdownlist change event

$('#YourDDLId').on('change', function () {
// Your code.

});

Try this..