Knockout.js JqueryUI自動完成綁定-返回對象而不是值

Question

我正在使用一個不錯的自定義綁定來填充JQueryUI自動完成，但是我想對其進行自定義以返回Item對象，然后可以將其推入另一個數組。 誰能闡明如何做到這一點？ 謝謝！

http://jsfiddle.net/rniemeyer/kEdT5/

    <input data-bind="jqAuto: { autoFocus: true }, jqAutoSource: myOptions, jqAutoValue: mySelectedOption, jqAutoSourceLabel: 'name', jqAutoSourceValue: 'id'" />

<hr/>

<div data-bind="text: ko.toJSON(mySelectedOption)"></div>



    //jqAuto -- additional options to pass to autocomplete
//jqAutoSource -- the array of choices
//jqAutoValue -- where to write the selected value
//jqAutoSourceLabel -- the property name that should be displayed in the possible choices
//jqAutoSourceValue -- the property name to use for the value
ko.bindingHandlers.jqAuto = {
    init: function(element, valueAccessor, allBindingsAccessor, viewModel) {
        var options = valueAccessor() || {};
        var allBindings = allBindingsAccessor();
        var unwrap = ko.utils.unwrapObservable;

        //handle value changing
        var modelValue = allBindings.jqAutoValue;
        if (modelValue) {
            var handleValueChange = function(event, ui) {
                var valueToWrite = ui.item ? ui.item.value : $(element).val();
                if (ko.isWriteableObservable(modelValue)) {
                   modelValue(valueToWrite );  

                } else {  //write to non-observable
                   if (allBindings['_ko_property_writers'] && allBindings['_ko_property_writers']['jqAutoValue'])
                            allBindings['_ko_property_writers']['jqAutoValue'](valueToWrite );    
                }
            };

            options.change = handleValueChange;
            options.select = handleValueChange;  
        }

        //handle the choices being updated in a DO, so the update function doesn't have to do it each time the value is updated
        var mappedSource = ko.dependentObservable(function() {
            var source = unwrap(allBindings.jqAutoSource);
            var valueProp = unwrap(allBindings.jqAutoSourceValue);
            var labelProp = unwrap(allBindings.jqAutoSourceLabel) || valueProp;

            var mapped = ko.utils.arrayMap(source, function(item) {
                var result = {};
                result.label = labelProp ? unwrap(item[labelProp]) : unwrap(item).toString();  //show in pop-up choices
                result.value = valueProp ? unwrap(item[valueProp]) : unwrap(item).toString();  //value 
                return result;
            });
            return mapped;                
        });

        mappedSource.subscribe(function(newValue) {
           $(element).autocomplete("option", "source", newValue); 
        });

        options.source = mappedSource();

        $(element).autocomplete(options);
    },
    update: function(element, valueAccessor, allBindingsAccessor, viewModel) {
        //update value based on a model change
        var allBindings = allBindingsAccessor();
        var modelValue = allBindings.jqAutoValue;
        if (modelValue) {
           $(element).val(ko.utils.unwrapObservable(modelValue));    
        }
    }
};

function Item(id, name) {
    return {
        id: ko.observable(id),
        name: ko.observable(name)
    };
}

var viewModel = {
    myOptions: ko.observableArray([
        new Item("One", "1 - One description"),
        new Item("Two", "2 - Two description"),
        new Item("Three", "3- Three description"),
        new Item("Four", "4- Four description"),
        new Item("Five", "5- Five description")
    ]),
    mySelectedOption: ko.observable()
};

ko.applyBindings(viewModel);

Answer 1

您可以向jQuery UI自動完成功能的選擇功能添加一些邏輯。 放置在綁定處理程序內：

if (modelValue) {
    var handleValueChange = function(event, ui) {
        ...
    }

我對您的示例進行了一些更改。 我希望這不是完美的，但可以作為一個起點。 http://jsfiddle.net/dima_k/kEdT5/37/

Answer 2

這篇文章中提供了該自動完成綁定的更新版本： 如何創建自動完成組合框？ 。 它將輸入框中顯示的值與寫入的值分開。 如果關閉jqAutoSourceValue ，則它將寫入整個對象。

這是一個示例： http : //jsfiddle.net/rniemeyer/3vqpP/

Answer 3

您可以添加一個小的超時來解決該問題：

...
select: function (event, ui) {
            var selectedItem = ui.item;

            window.setTimeout(function () {
                $(element).val(selectedItem.koObservableValue);
            }, 10);
        }

如果這是一個簡單的值

...
select: function (event, ui) {
            var selectedItem = ui.item;

            window.setTimeout(function () {
                $(element).val(selectedItem);
            }, 10);
        }