Bootstrap Multi-select not working in a POST dropdown?

Question

I've got the following pre-requisites for initializing multi-select.

<link href="http://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.min.css" rel="stylesheet" media="screen">
<link href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
<link href="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/css/bootstrap-multiselect.css" rel="stylesheet" type="text/css" />
<!-- Bootstrap core and multiselect JS -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/js/bootstrap.js"></script>
<script src="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/js/bootstrap-multiselect.js" type="text/javascript"></script>

It doesn't appear to be working as expected as shown here:

Now what I have as a second dropdown 'Name' is an AJAX-type dropdown based from the value of the first dropdown 'Select Integration'.

<tr>
<td>Select Integration: </td> <td>
    <select name="new_src_type_id" id="integration-list" class="form-control" onChange="getState(this.value);">
            <option value="">Select Integration</option>
        <?php
            foreach ($integration_id as $index_integ => $integ_id) {
                echo "<option value='$integ_id'>".$integration[$index_integ]." </option>";
            }
        ?>
    </select>
</td>
</tr>
<tr>
<td>Name: (The changes made will be applied to the ff:)</td> <td>
    <select name="element[]" id="element-list" class="form-control" multiple="multiple">
</select>
</td>
</tr>

called by:

<script>
function getState(val) {
    $.ajax({
    type: "POST",
    url: "get_element.php",
    data:'src_type_id='+val,
    success: function(data){
        $("#element-list").html(data);
    }
    });
}
</script>

I'd like to be able to initialize the second dropdown 'Name' as a multi-select dropdown but it doesn't work like how the docs showed it. http://davidstutz.github.io/bootstrap-multiselect/

And this doesn't seem to work when I call it like this:

<script>
$(document).ready(function() { 
        $('#element-list').multiselect({
            includeSelectAllOption: true
        });
    });
</script>

Answer 1

Sometimes you can't initialize element after loaded using ajax, you need to re-initialize again after that ajax finish loaded.

<script>
    function getState(val) {
        $.ajax({
        type: "POST",
        url: "get_element.php",
        data:'src_type_id='+val,
        success: function(data){
            $("#element-list").html(data);
            $('#element-list').multiselect({ includeSelectAllOption: true });
        }
        });
    }
</script>

Answer 2

You need to initialize your multiselect like below (Assuming your ajax call is returning values correctly as you want).

function getState(val) {
    $.ajax({
    type: "POST",
    url: "get_element.php",
    data:'src_type_id='+val,
    success: function(data){
        $("#element-list").append($('<option></option>').val(data).html(data)).multiselect("destroy").multiselect({
            includeSelectAllOption: true,          //For SelectAll Option
            enableFiltering: true,                 //For Search Option
         });
    }
}

I have written

.multiselect("destroy")

to destroy the previous instance of multiselect as you are going to change values of multiselect depending on dropdown.