bootstrap multiselect get selected values

Question

How do I get back on onChange all selected values in my multiselect dropdown. Used plugin here. Trying to use the following but I think I'm on the wrong track

$('#multiselect1').multiselect({
        selectAllValue: 'multiselect-all',
        enableCaseInsensitiveFiltering: true,
        enableFiltering: true,
        maxHeight: '300',
        buttonWidth: '235',
        onChange: function(element, checked) {
            var brands = $('#multiselect1 option:selected');
            var selection = [];
            $(brands).each(function(index, brand){
                selection.push(brand);
            });

            console.log(selection);
        }
    });

found it

$('#multiselect1').multiselect({
    selectAllValue: 'multiselect-all',
    enableCaseInsensitiveFiltering: true,
    enableFiltering: true,
    maxHeight: '300',
    buttonWidth: '235',
    onChange: function(element, checked) {
        var brands = $('#multiselect1 option:selected');
        var selected = [];
        $(brands).each(function(index, brand){
            selected.push([$(this).val()]);
        });

        console.log(selected);
    }
});

Answer 1

$('#multiselect1').on('change', function(){
    var selected = $(this).find("option:selected");    
    var arrSelected = [];

    // selected.each(function(){
    //   arrSelected.push($(this).val());
    // });

    // The problem with the above selected.each statement is that  
    // there is no iteration value.
    // $(this).val() is all selected items, not an iterative item value.
    // With each iteration the selected items will be appended to 
    // arrSelected like so    
    //
    // arrSelected [0]['item0','item1','item2']
    // arrSelected [1]['item0','item1','item2'] 

    // You need to get the iteration value. 
    //
    selected.each((idx, val) => {
        arrSelected.push(val.value);
    });
    // arrSelected [0]['item0'] 
    // arrSelected [1]['item1']
    // arrSelected [2]['item2']
});

Answer 2

In my case i was using jQuery validation rules with

submitHandler function and submitting the data as new FormData(form);

Select Option

<select class="selectpicker" id="branch" name="branch" multiple="multiple" title="Of Branch" data-size="6" required>
  <option disabled>Multiple Branch Select</option>
  <option value="Computer">Computer</option>
  <option value="Civil">Civil</option>
  <option value="EXTC">EXTC</option>
  <option value="ETRX">ETRX</option>
  <option value="Mechinical">Mechinical</option>
</select>

<input type="hidden" name="new_branch" id="new_branch">

Get the multiple selected value and set to new_branch input value & while submitting the form get value from new_branch

Just replace hidden with text to view on the output

<input type="text" name="new_branch" id="new_branch">

Script (jQuery / Ajax)

<script>
    $(document).ready(function() {

      $('#branch').on('change', function(){
          var selected = $(this).find("option:selected"); //get current selected value
          var arrSelected = []; //Array to store your multiple value in stack
          selected.each(function(){
            arrSelected.push($(this).val()); //Stack the value
          });
          $('#new_branch').val(arrSelected); //It will set the multiple selected value to input new_branch
      });

    });
</script>

Answer 3

$('#multiselect1').on('change', function(){
    var selected = $(this).find("option:selected");
    var arrSelected = [];
    selected.each(function(){
       arrSelected.push($(this).val());
    });
});

Answer 4

the solution what I found to work in my case

$('#multiselect1').multiselect({
    selectAllValue: 'multiselect-all',
    enableCaseInsensitiveFiltering: true,
    enableFiltering: true,
    maxHeight: '300',
    buttonWidth: '235',
    onChange: function(element, checked) {
        var brands = $('#multiselect1 option:selected');
        var selected = [];
        $(brands).each(function(index, brand){
            selected.push([$(this).val()]);
        });

        console.log(selected);
    }
}); 

Answer 5

more efficient, due to less DOM lookups:

$('#multiselect1').multiselect({
    // ...
    onChange: function() {
        var selected = this.$select.val();
        // ...
    }
});

Answer 6

In your Html page please add

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Test the multiselect with ajax</title>

    <!-- Bootstrap -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css">
    <!-- Bootstrap multiselect -->
    <link rel="stylesheet" href="http://davidstutz.github.io/bootstrap-multiselect/dist/css/bootstrap-multiselect.css">

    <!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.2/html5shiv.js"></script>
      <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
    <![endif]-->
  </head>
  <body>
    <div class="container">
      <br>

      <form method="post" id="myForm">

        <!-- Build your select: -->
        <select name="categories[]" id="example-getting-started" multiple="multiple" class="col-md-12">
          <option value="A">Cheese</option>
          <option value="B">Tomatoes</option>
          <option value="C">Mozzarella</option>
          <option value="D">Mushrooms</option>
          <option value="E">Pepperoni</option>
          <option value="F">Onions</option>
          <option value="G">10</option>
          <option value="H">11</option>
          <option value="I">12</option>
        </select>
        <br><br>
        <button type="button" class="btnSubmit"> Send </button>

      </form>

      <br><br>
      <div id="result">result</div>
    </div><!--container-->

    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <!-- Include all compiled plugins (below), or include individual files as needed -->
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
    <!-- Bootstrap multiselect -->
    <script src="http://davidstutz.github.io/bootstrap-multiselect/dist/js/bootstrap-multiselect.js"></script>

    <!-- Bootstrap multiselect -->
    <script src="ajax.js"></script>

    <!-- Initialize the plugin: -->
    <script type="text/javascript">
      $(document).ready(function() {

        $('#example-getting-started').multiselect();

      });
    </script>

  </body>
</html>

In your ajax.js page please add

$(document).ready(function () {
  $(".btnSubmit").on('click',(function(event) {
    var formData = new FormData($('#myForm')[0]);
    $.ajax({
      url: "action.php",
      type: "POST",
      data: formData,
      contentType: false,
      cache: false,
      processData:false,
      success: function(data)
      {
        $("#result").html(data);

        // To clear the selected options
        var select = $("#example-getting-started");
        select.children().remove();
        if (data.d) {
          $(data.d).each(function(key,value) {
            $("#example-getting-started").append($("<option></option>").val(value.State_id).html(value.State_name));
          });
        }
        $('#example-getting-started').multiselect({includeSelectAllOption: true});
        $("#example-getting-started").multiselect('refresh');

      },
      error: function()
      {
        console.log("failed to send the data");
      }
    });
  }));
});

In your action.php page add

  echo "<b>You selected :</b>";

  for($i=0;$i<=count($_POST['categories']);$i++){

    echo $_POST['categories'][$i]."<br>";

  }