Integrating the 'Select All' feature into a Bootstrap Multiselect form or list

Question

Integrating the 'Select All' feature into a Bootstrap Multiselect form or list

I am working on a .NET web application that has multiple views for selecting from database tables.

Using Bootstrap 4.3, I have successfully generated the list but now need to include a 'Select All' option to streamline the selection process.

Below is the relevant section from the .cshtml file:

<div class="form-group">
     <label asp-for="Products" class="control-label"></label>
     <select asp-for="Products" class="form-control" asp-items="ViewBag.AllProducts" size="10"></select>
</div>

The list of products displayed in ViewBag.AllProducts is generated by one of my controllers based on a model.

After researching similar solutions, it seems like I may need to implement a JavaScript script to add the 'Select All' feature. However, most examples I found involved predefined option lists instead of using ViewBag.

I attempted the following approach without success:

$(".multiselect", this.el).multiselect({
includeSelectAllOption: true
});

If anyone has any advice or guidance on whether my solution is on the right track, I would greatly appreciate it.

javascript c#bootstrap-4

Answer 1

Answer №1

When creating a multi-select using tag helpers, you can incorporate an option with the class .select-all and then implement some basic javascript to handle its functionality of selecting all options except itself upon clicking.

Instead of utilizing ViewBag to pass the list of available products to the view for generating dropdown options, it is advisable to leverage the existing view model by defining an additional property to store this data.

// View model
public class DashboardViewModel
{
    [Display(Name = "Products")]
    public int[] SelectedProducts { get; set; }

    public IDictionary<int, string> AvailableProducts { get; set; }
}

// Controller
public IActionResult Index()
{
    var vm = new DashboardViewModel
    {
        // Retrieving data from storage to populate the view model
        AvailableProducts = new Dictionary<int, string>()
        {
            { 1, "Cabinet" },
            { 2, "Countertop" },
            { 3, "Sink" },
            { 4, "Faucet" },
            { 5, "Flooring" },
            { 6, "Tile" }
        }
    };

    return View(vm);
}

@*View*@
@model DashboardViewModel

<div class="form-group">
    <label asp-for="SelectedProducts"></label>
    <select asp-for="SelectedProducts" class="form-control" 
        asp-items="new MultiSelectList(Model.AvailableProducts, "Key", "Value")" size="10">
        <option class="select-all">- select all -</option>
    </select>
</div>

Lastly, you can include some straightforward javascript to manage the click event of the .select-all option:

<script type="text/javascript">
    $(function() {
        $('select[multiple="multiple"]').on('click', 'option.select-all', function() {
            let $selectAllOption = $(this),
                $select = $(this).closest('select');

            // Selecting all options
            $('option', $select).prop('selected', true);

            // Deselecting the select-all option
            $selectAllOption.prop('selected', false);

            return false;
        });
    });
</script>

https://i.sstatic.net/dSTq6.gif

Answer 2

When creating a multi-select using tag helpers, you can incorporate an option with the class .select-all and then implement some basic javascript to handle its functionality of selecting all options except itself upon clicking.

Instead of utilizing ViewBag to pass the list of available products to the view for generating dropdown options, it is advisable to leverage the existing view model by defining an additional property to store this data.

// View model
public class DashboardViewModel
{
    [Display(Name = "Products")]
    public int[] SelectedProducts { get; set; }

    public IDictionary<int, string> AvailableProducts { get; set; }
}

// Controller
public IActionResult Index()
{
    var vm = new DashboardViewModel
    {
        // Retrieving data from storage to populate the view model
        AvailableProducts = new Dictionary<int, string>()
        {
            { 1, "Cabinet" },
            { 2, "Countertop" },
            { 3, "Sink" },
            { 4, "Faucet" },
            { 5, "Flooring" },
            { 6, "Tile" }
        }
    };

    return View(vm);
}

@*View*@
@model DashboardViewModel

<div class="form-group">
    <label asp-for="SelectedProducts"></label>
    <select asp-for="SelectedProducts" class="form-control" 
        asp-items="new MultiSelectList(Model.AvailableProducts, "Key", "Value")" size="10">
        <option class="select-all">- select all -</option>
    </select>
</div>

Lastly, you can include some straightforward javascript to manage the click event of the .select-all option:

<script type="text/javascript">
    $(function() {
        $('select[multiple="multiple"]').on('click', 'option.select-all', function() {
            let $selectAllOption = $(this),
                $select = $(this).closest('select');

            // Selecting all options
            $('option', $select).prop('selected', true);

            // Deselecting the select-all option
            $selectAllOption.prop('selected', false);

            return false;
        });
    });
</script>

https://i.sstatic.net/dSTq6.gif

Integrating the 'Select All' feature into a Bootstrap Multiselect form or list

Answer №1

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