Using select2, items can be automatically selected for an ajax call

Is it possible to configure a select2 control to automatically select an item when the ajax response contains extra data?

I am looking to set up my controller to mark an item as an exact match in the JsonResult and have the select2 control automatically select it without needing to open the dropdown menu.

From the user's perspective: If the user types in a string that exactly matches an item in the controller, for example if they input a barcode and the controller finds a matching bar-code. The Select2 control will immediately highlight that item without requiring the user to manually open the dropdown menu.

If the user types in a query that does not exactly match any items in the controller, the controller will return a list of potential options without the "exact" parameter and the Select2 control will open the dropdown menu to display these options to the user.

javascriptajaxjquery-select2jquery-select2-4

Answer №1

If you want to implement AJAX functionality, make sure to include a selected option in the select DOM element and then initiate a change on the select2 widget for it to refresh. Below is an example that may meet your requirements. In this scenario, processResults is used to verify if there is only one exact match based on user input.

$("#product_id").select2({
  ajax: {
    url: "/api/productLookup",
    dataType: 'json',
    data: function (params) {
      return {
        term: params.term,
        };
    },
    processResults: function (data) {
        var searchTerm = $("#product_id").data("select2").$dropdown.find("input").val();
        if (data.results.length == 1 && data.results[0].text == searchTerm) {
            $("#product_id").append($("<option />")
                .attr("value", data.results[0].id)
                .html(data.results[0].text)
            ).val(data.results[0].id).trigger("change").select2("close");
        }
        return data;
    },
    minimumInputLength: 8,
    cache: true
  }
});

Answer №2

#this solution was successful for me - integrating select2 with barcode functionality
var defaultInitialGroup = '';
    $("#idbarang").select2({
        placeholder: "Type/ Scan your barcode item",
        allowClear: true,
        minimumInputLength: 2,
        multiple: true,
        ajax: {
            url: HOST_URL + 'stock/balance/list_xxv',
            type: 'POST',
            dataType: 'json',
            delay: 250,
            data: function(params) {
            return {
            _search_: params.term, // search term
            _page_: params.page,
            _draw_: true,
            _start_: 1,
            _perpage_: 2,
            _paramglobal_: defaultInitialGroup,
            term: params.term,
            };
            },
            processResults: function (data, params) {
            var searchTerm = $("#idbarang").data("select2").$dropdown.find("input").val();
        if (data.items.length === 1 && data.items[0].text === searchTerm) {
        var option = new Option(data.items[0].nmbarang, data.items[0].idbarang, true, true);
        $('#idbarang').append(option).trigger('change').select2("close");
        // manually trigger the `select2:select` event
         $('#idbarang').trigger({
         type: 'select2:select',
         params: {
            data: data
        }
        });}
        params.page = params.page || 1;
        return {
        results: data.items,
            pagination: {
            more: (params.page * 30) < data.total_count
            }
            };
            },
            cache: false
        },
        escapeMarkup: function(markup) {
        return markup;
        }, // custom formatter retained
        templateResult: formatItem, // skipped for brevity, refer to page source
        templateSelection: formatItemSelection // skipped for brevity, refer to page source
    })
function formatItem(repo) {
if (repo.loading) return repo.text;
var markup ="<div class='select2-result-repository__description'>" + repo.idbarang +"<i class='fa fa-circle-o'></i>"+ repo.nmbarang +"</div>";
return markup;
}
function formatItemSelection(repo){
return repo.nmbarang || repo.text;
}

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