How to get multiple select box values using jQuery?

Using the .val() function on a multi-select list will return an array of the selected values:

var selectedValues = $('#multipleSelect').val();

and in your html:

<select id="multipleSelect" multiple="multiple">
    <option value="1">Text 1</option>
    <option value="2">Text 2</option>
    <option value="3">Text 3</option>
</select>

You can also use js map function:

$("#multipleSelect :selected").map(function(i, el) {
    return $(el).val();
}).get();

And then you can get any property of the option element:

return $(el).text();
return $(el).data("mydata");
return $(el).prop("disabled");
etc...

Just by one line-

var select_button_text = $('#SelectQButton option:selected')
                .toArray().map(item => item.text);

Output: ["text1", "text2"]

var select_button_text = $('#SelectQButton option:selected')
                .toArray().map(item => item.value);

Output: ["value1", "value2"]

If you use .join()

var select_button_text = $('#SelectQButton option:selected')
                .toArray().map(item => item.text).join();

Output: text1,text2,text3

var selected=[];
 $('#multipleSelect :selected').each(function(){
     selected[$(this).val()]=$(this).text();
    });
console.log(selected);

Yet another approch to this problem. The selected array will have the indexes as the option values and the each array item will have the text as its value.

for example

<select id="multipleSelect" multiple="multiple">
    <option value="abc">Text 1</option>
    <option value="def">Text 2</option>
    <option value="ghi">Text 3</option>
</select>

if say option 1 and 2 are selected.

the selected array will be :

selected['abc']=1; 
selected['def']=2.

Html Code:

 <select id="multiple" multiple="multiple" name="multiple">
  <option value=""> -- Select -- </option>
  <option value="1">Opt1</option>
  <option value="2">Opt2</option>
  <option value="3">Opt3</option>
  <option value="4">Opt4</option>
  <option value="5">Opt5</option>
 </select>   

JQuery Code:

$('#multiple :selected').each(function(i, sel){ 
    alert( $(sel).val() ); 

});

Hope it works

Just use this

$('#multipleSelect').change(function() {
    var selectedValues = $(this).val();  
});

Get selected values in comma separator

var Accessids = "";
$(".multi_select .btn-group>ul>li input:checked").each(function(i,obj)
{
    Accessids=Accessids+$(obj).val()+",";
});
Accessids = Accessids.substring(0,Accessids.length - 1);
console.log(Accessids);

In case if you have multiple select boxes on a single page and they all have the same class which you can prefer in case of multiple rather than tracking id's:

$('.classname option:selected').map(function(){
    return this.value; // If you want value.
    // Or you could also do.
    return this.text; // If you want text of select boxes.
}).get(); // It will return an Array of selected values/texts.

This jQuery works well for me. I use a getFormValues() function for various tasks, so it's a good place to rebuild some of the form data when it's missing.

It checks each form field to see if it's a multi-select type and if it is, rebuild the value with all of the selected options. I'm sure something similar would be needed for checkboxes too...

// Get form values as a key-value Object
function getFormValues(form) {
  var formData = new FormData(form[0]),
      values = Object.fromEntries(formData);
  
  // Rebuild multi-select values.
  $.each(values, function(key, value){
    var element = $(form).find(':input[name="'+key+'"]');
    if (element.is('select[multiple]')){
      values[key] = element.val();
    }
  });
  return values;
}

`

// Use with AJAX.
$('form').on('submit', function(e){
  e.preventDefault();
  var form = $(this);
  
  $.ajax({
    URL: 'http://google.com/',
    data: getFormValues(form),
    success: function(data, textStatus){
      console.log(data);
    },
    error: function(jqXHR, textStatus, errorThrown){
      console.log(textStatus, errorThrown);
    }
  });
});