How to customize a select listbox in asp.net using bootstrap and remove unwanted

Whenever the drop-down selection changes, I want to dynamically update a list group box by replacing all existing items with new ones.

Here's the code for the list group box:

<select style="max-height: 30vh; min-height: 30vh; width: 100%; border: 0;"
                        multiple="multiple"
                        class="list-group list-group-available-items overflow-auto">
                    @foreach (var listGroupOption in Model.OrderItems ?? new List<SelectListItem>())
                    {
                        <option value="@listGroupOption.Value" class="list-group-item">
                            @listGroupOption.Text
                        </option>
                    }
                </select>

Below is my JavaScript attempt at achieving this functionality:

$('#ddlRegion').change(function (e) {

            $(".list - group - available - items")
                    .find('option')
                    .remove();
        });
javascriptc#twitter-bootstrapasp.net-core

Answer №1

To simplify, we can utilize the empty function to remove all options:

$(".list-group-available-items").empty();

Alternatively, we can use the remove function to target specific options:

$(".list-group-available-items option").remove();

If we need to add new options after removing all existing ones, we can use the append function:

$(".list-group-available-items option").remove();

$(".list-group-available-items").append($('<option>', { 
        value: 'newOption',
        text : 'newOption' 
}));
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<select class="list-group-available-items">
  <option value="option1">option1</option>
  <option value="option2">option2</option>
  <option value="option3">option3</option>
</select>

Answer №2

To update the list, you can use the following approach: first clear the existing options using .empty(), then add new options using append():

const myButton = document.getElementById('btn');
        myButton.addEventListener('click', function(){
            $(".list-group-available-items").empty();
            $(".list-group-available-items").append('<option value="newval1">New Item 1</option>');
            $(".list-group-available-items").append('<option value="newval2">New Item 2</option>');
            $(".list-group-available-items").append('<option value="newval3">New Item 3</option>');
        });

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