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Jquery autocomplete combobox : Fire event on option select

Posted by: admin November 1, 2017 Leave a comment

Questions:

I have an autocomplete combobox which I created referring to this source Build jQuery UI Autocomplete – Combobox in JavaScript

The only difference instead of hardcoding the the options for select menu I am populating the options from the data obtained from an ajax call.

What I am looking to do now is whenever a option is selected from the combobox, I need to fire an event, let’s say show an alert with the selected value.

I have tried creating .change() functions for both the select as well as input elements (not both together) but nothing seems to work.

Here is an overview of the code(upon a button click the show_menu function is called):

function show_menu() {
    var container_div = 
    "<div id='container_div'>"+
    "<label>Branch:</label>"+
    "<select id='combobox'>"+
    "</select>"+
    "</div>";
    get_data();
    build_combo_box();
}

function get_data()
{
    $.ajax({
        url: "URL",
        data: {
            DATA
        },
        success: function(data){
            $.each(argument, function(i,d){
                $("#combobox").append('<option value="' + name + '">' + name + '</option>');
            });
        }
    });
}

function build_combo_box(){
    $("#combobox").combobox();
    $("#toggle").click(function() {
        $("#combobox").toggle();
    });
}

(function($) {
    $.widget("custom.combobox", {
        _create: function() {
            this.wrapper = $("<span>")
                .addClass("custom-combobox")
                .insertAfter(this.element);
            this.element.hide();
            this._createAutocomplete();
            this._createShowAllButton();
        },

        _createAutocomplete: function() {
            var selected = this.element.children(":selected"),
                value = selected.val() ? selected.text() : "";
            this.input = $("<input>")
                .appendTo(this.wrapper)
                .val(value)
                .attr("title", "")
                .attr("placeholder","Select a branch...")
                .addClass("custom-combobox-input ui-widget ui-widget-content ui-state-default ui-corner-left")
                .autocomplete({
                    delay: 0,
                    minLength: 0,
                    source: $.proxy(this, "_source")
                })
                .tooltip({
                    tooltipClass: "ui-state-highlight"
                });

            this._on(this.input, {
                autocompleteselect: function(event, ui) {
                    ui.item.option.selected = true;
                    this._trigger("select", event, {
                        item: ui.item.option
                    });
                },

                autocompletechange: "_removeIfInvalid"
            });
        },

        _createShowAllButton: function() {
            var input = this.input,
                wasOpen = false;

            $("<a>")
                .attr("tabIndex", -1)
                .attr("title", "Show All Items")
                .tooltip()
                .appendTo(this.wrapper)
                .button({
                    icons: {
                        primary: "ui-icon-triangle-1-s"
                    },
                    text: false
                })
                .removeClass("ui-corner-all")
                .addClass("custom-combobox-toggle ui-corner-right")
                .mousedown(function() {
                    wasOpen = input.autocomplete("widget").is(":visible");
                })
                .click(function() {
                    input.focus();

                    // Close if already visible
                    if (wasOpen) {
                        return;
                    }

                    // Pass empty string as value to search for, displaying all results
                    input.autocomplete("search", "");
                });
        },

        _source: function(request, response) {
            var matcher = new RegExp($.ui.autocomplete.escapeRegex(request.term), "i");
            response(this.element.children("option").map(function() {
                var text = $(this).text();
                if (this.value && (!request.term || matcher.test(text)))
                    return {
                        label: text,
                        value: text,
                        option: this
                    };
            }));
        },

        _removeIfInvalid: function(event, ui) {

            // Selected an item, nothing to do
            if (ui.item) {
                return;
            }

            // Search for a match (case-insensitive)
            var value = this.input.val(),
                valueLowerCase = value.toLowerCase(),
                valid = false;
            this.element.children("option").each(function() {
                if ($(this).text().toLowerCase() === valueLowerCase) {
                    this.selected = valid = true;
                    return false;
                }
            });

            // Found a match, nothing to do
            if (valid) {
                return;
            }

            // Remove invalid value
            this.input
                .val("")
                .attr("title", value + " didn't match any item")
                .tooltip("open");
            this.element.val("");
            this._delay(function() {
                this.input.tooltip("close").attr("title", "");
            }, 2500);
            this.input.data("ui-autocomplete").term = "";
        },

        _destroy: function() {
            this.wrapper.remove();
            this.element.show();
        }
    });
})(jQuery);
Answers: