Knockout.js自动完成bindingHandler [英] Knockout.js autocomplete bindingHandler

问题描述

我正在尝试Knockout.js的自动完成处理程序，并且正在寻找一些反馈.这目前可行，但是我试图查看是否可以在没有到处放置这么多Eval()的情况下完成工作，并且为了可重用性，请查看是否有一种方法可以在不预先假设的情况下引用ViewModel名为"vm"，如下所示.

I'm trying my hand at an autocomplete handler for Knockout.js, and I'm looking for some feedback. This currently works, but I'm trying to see if I can get the job done without so many Eval()s all over the place, and for the sake of reusability, see if there is a way to reference the ViewModel without presupposing it is named 'vm' as below.

用法:

<input placeholder="Test..." type="search" data-bind="autoComplete:$root.persons, source:'/api/Person/', parameterName:'searchString', labelKey:'displayName', valueKey:'urid', onSelected:'addPerson'" autocomplete="off" />

JS:

ko.bindingHandlers.autoComplete = {
    init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
        var postUrl = allBindingsAccessor().source; // url to post to is read here
        var param = allBindingsAccessor().parameterName;
        var labelKeyName = allBindingsAccessor().labelKey;
        var valueKeyName = allBindingsAccessor().valueKey;
        var selectedFunction = allBindingsAccessor().onSelected;
        var selectedObservableArrayInViewModel = valueAccessor();

        $(element).autocomplete({
            minLength: 2,
            autoFocus: true,
            source: function (request, response) {
                $.ajax({
                    url: param != null ? postUrl : postUrl + request.term,
                    data: param == null ? '' : param + "=" + request.term,
                    dataType: "json",
                    type: "GET",
                    success: function (data) {
                        response($.map
                            (data, function (obj) {
                                return {
                                    label: eval("obj." + labelKeyName),
                                    value: eval("obj." + valueKeyName)
                                };
                            }));
                    }
                });
            },
            select: function (event, ui) {
                if (selectedFunction != null) {
                    var functionCall = 'vm.' + selectedFunction + "(event, ui)";
                    eval(functionCall);
                }
            }
        });
    }
};

推荐答案

出于某些启发，我将在 stackoverflow post ，这是我所见过的最全面的自动完成绑定处理程序.

For some inspiration, I would look at Ryan Niemeyers answer in this stackoverflow post, which is the most comprehensive autocomplete binding handler I have seen.

在此 stackoverflow帖子中，可以找到我和我的团队为我们自己创建的另一个但更简单的自动完成绑定处理程序 a>

Another, but much simpler autocomplete binding handler which my team and I created for our own purposes can be found in this stackoverflow post

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