Unable to display search results with AJAX in Select2

I'm struggling with getting the desired outcomes to display in Select2 when using AJAX. Below is my code:

$(document).ready(function() {
    $("#producto").select2({
        placeholder: 'Select a product',
        formatResult: productFormatResult,
        formatSelection: productFormatSelection,
        dropdownClass: 'bigdrop',
        escapeMarkup: function(m) { return m; },
        minimumInputLength:3,
        ajax: {
            url: 'http://foo.foo/listar.json',
            dataType: 'jsonp',
            data: function(term, page) {
                return {
                    q: term
                };  
            },  
            results: function(data, page) {
                return {results:data};
            }   
        }   
    });


function productFormatResult(product) {
    var html = "<table class='product-resultado'><tr>";
    if(product.img != undefined) {
        html += "<td class='product-image'><img src='"+product.img+"'/></td>";
    }
    html += "<td class='product-info'>";
    html += product.text + "<br />";
    html += product.precio_costo + " CRC <br />";
    html += "Existencias: " + product.existencias;
    html += "</td></tr></table>";
    return html;
}

function productFormatSelection(product) {
    return product.text;
}

Upon checking the Javascript Console, I can confirm that the request is returning the expected JSON response:

[

{ "text":"Foo Product", "img":"#", "precio_costo": 45, "existencias":0, "id":2 }

]

I suspect that the results:function(data, page) { ... } isn't triggering as intended, as I attempted an alert there and it didn't show up.

The process seems stuck, awaiting the results:

Answer №1

Perhaps the issue lies in returning json instead of jsonp.

You may want to consider modifying the line dataType: 'jsonp' to dataType: 'json', or potentially removing it altogether.

I've encountered a similar situation in the past where the JSON result was not recognized due to this distinction, even if the actual JSON data was being returned. It's possible that json and jsonp are being interpreted as different formats.

Side note: This message is more like a comment, but given the limitations on commenting, please understand.

Answer №2

It's not possible to directly return a value from an ajax call because the process is asynchronous. Instead, you should handle the results within the ajax call itself or utilize callback functions as explained in the following resource.

Refer to Ajax Callback Functions: Best Practices

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