Mastering the art of utilizing jQuery autocomplete with AJAX source and appendTo functionality

Here is my attempt at making appendTo work alongside jQuery autocomplete using an AJAX source.

I have several questions that may benefit others who are struggling to grasp the correct approach for implementing autocomplete with an AJAX source.

1) What exactly does

source: function(request, response) {...}
do and why is it necessary?

2) In what format does

function(data){ response($.map (data, function(obj) {
return the data? I understand it's in JSON format, but what is the purpose of .map? Is it essential to include this step? Are there advantages?

3a) When utilizing appendTo and renderItem, is it mandatory to have the aforementioned success data returned?

3b) Whether or not the above data is required, how can you properly utilize appendTo and renderItem to modify the formatting and presentation of your fetched values?

$(function() {
$( ".find_group_ac" ).autocomplete({
        minLength: 1,
        source: function(request, response) {
            $.ajax({
                url: "welcome/search/",
                data: { term: $(".find_group_ac").val()},
                dataType: "json",
                type: "POST",
                success: function(data){ response($.map
                        (data, function(obj) {
                            return {
                            label: obj.name + ': ' + obj.description,
                            value: obj.name,
                            id: obj.name
                };}));}
            });
        }
    }).data( "autocomplete" )._renderItem = function( ul, item ) {
            return $( "<li></li>" )
                .data( "item.autocomplete", item )
                .append( "<a>" + item.label + "<br>" + item.desc + "</a>" )
                .appendTo( ul );
        };
});

This may seem like a lot to unpack, but I believe it will be a valuable resource for many JavaScript beginners, including myself.

Answer №1

source: function(request, response) {...}
What purpose does this serve and why is it necessary?

When performing a custom AJAX POST to fetch data, you need to define a function that triggers the response callback with the relevant autocomplete suggestions.

In a basic scenario, you can directly provide a string to the source parameter, prompting the widget to initiate a GET request to that URL appended with ?term=(term). Since you are executing a POST and transmitting a different term, utilizing the function version of source is essential.

PS: It is recommended to utilize request.term in the $.ajax call instead of $(".find_group_ac").val()


When using appendTo and renderItem, is it obligatory to have the aforementioned success data returned?

No, but they are commonly utilized together.

If you wish to display an additional property (e.g., description) in the list of candidates, you may need to transform the server-side output into the expected format for autocomplete (including label and value along with

description</code). Nevertheless, if you want to exhibit the <code>description
property, you will need to override _renderItem.


How can you effectively employ appendTo and renderItem to alter the formatting and presentation of your received values?

If the preceding questions are answered satisfactorily in this explanation, then you should simply integrate the concepts by implementing some code:

$( ".find_group_ac" ).autocomplete({
    minLength: 1,
    source: function(request, response) {
        $.ajax({
            url: "welcome/search/",
            data: { term: $(".find_group_ac").val()},
            dataType: "json",
            type: "POST",
            success: function(data) { 
                response($.map(data, function(obj) {
                    return {
                        label: obj.name,
                        value: obj.name,
                        description: obj.description,
                        id: obj.name // not necessary unless used elsewhere.
                    };
                }));
            }

        });
    }
}).data( "autocomplete" )._renderItem = function( ul, item ) {
    // Utilize any property existing on each item built with $.map inside _renderItem */
    return $("<li></li>")
        .data("item.autocomplete", item)
        .append("<a>" + item.label + "<br>" + item.description + "</a>")
        .appendTo(ul);
};

The examples on jQueryUI's documentation page for autocomplete are comprehensive and beneficial. Make sure to explore:

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