jQuery UI通过URL的JSON自动完成 [英] jQuery UI autocomplete with JSON from URL

问题描述

我正在使用jQuery UI自动完成功能.我可以将其与jQuery UI提供的示例一起使用，如下所示:

I'm using the jQuery UI Autocomplete function. I can make it work with the example provided with jQuery UI like this:

var availableTags = [
        "ActionScript",
        "AppleScript",
        "Asp",
        "BASIC",
        "C",
        "C++",
        "Clojure",
        "COBOL",
        "ColdFusion",
        "Erlang",
        "Fortran",
        "Groovy",
        "Haskell",
        "Java",
        "JavaScript",
        "Lisp",
        "Perl",
        "PHP",
        "Python",
        "Ruby",
        "Scala",
        "Scheme"
    ];

$("#tags").autocomplete({
    source: availableTags
});

这可以正常工作.但是我需要使用JSON作为可以像这样检索的数据源: http://mysite.local/services/suggest.ashx?query = ball

This works without any problems. But I need to use JSON as my data source who can be retrieved like this: http://mysite.local/services/suggest.ashx?query=ball

如果我要转到该URL，我将像这样返回JSON:

If I'm going to that URL I get JSON back like this:

 [{"id":12,"phrase":"Ball"},{"id":16,"phrase":"Football"},{"id":17,"phrase":"Softball"}]

如何使用我的URL作为数据源?

How can I use my URL as the data source?

我尝试过这样更改source-option:

I've tried changing the source-option like this:

$("#tags").autocomplete({
    source: "http://mysite.local/services/suggest.ashx"
});

但这没有帮助.我猜该服务不知道在输入字段中输入了哪个关键字?

But it doesn't help. I guess that the service doesn't know which keyword has been typed in the input field or so?

任何指针都很棒.

推荐答案

您需要更改源代码，以满足以下规范(文档).源必须是包含以下内容的数组(或返回包含以下内容的数组):

You need to change your source to meet the following specifications (outlined in the documentation for the widget). The source must be an array containing (or return an array containing):

• 简单字符串，或:
包含label属性和/或value属性的
• 对象.

• Simple strings, or:
• objects containing a label property, a value property, or both.

如果由于某种原因您无法更改远程源返回的内容，则可以在成功检索到数据后对其进行转换.这是您的操作方式:

If for some reason you cannot change what your remote source is returning, you can transform the data once it has successfully retrieved. Here's how you would do that:

$("#tags").autocomplete({
    source: function (request, response) {
        $.ajax({
            url: "http://mysite.local/services/suggest.ashx",
            data: { query: request.term },
            success: function (data) {
                var transformed = $.map(data, function (el) {
                    return {
                        label: el.phrase,
                        id: el.id
                    };
                });
                response(transformed);
            },
            error: function () {
                response([]);
            }
        });
    });
});

如您所见，您需要通过将函数传递给小部件的source选项来进行AJAX调用.

As you can see, you'll need to make the AJAX call yourself by passing in a function to the source option of the widget.

想法是使用 $.map 将数组转换为包含元素的数组自动完成小部件可以解析的内容.

The idea is to use $.map to transform your array into an array that contains elements that the autocomplete widget can parse.

还要注意，当用户键入术语时，传递给AJAX调用的data参数应以?query=<term>结尾.

Also notice that the data parameter passed to the AJAX call should end up as ?query=<term> when the user types a term.

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