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我尝试在 Ajax 调用中直接映射和绑定 JSON 数据，但没有成功。警报显示请求的数据。如果我将此警报的内容复制/粘贴到测试变量中，则映射工作正常。为什么我不能直接映射/绑定到结果？'test' 和 'result.d' 之间可能有什么区别？（绑定到结果 - 没有 .d 也不起作用）。

谢谢你的帮助。

 var test = { "formulier": { "titel": "test", "formulier_id": 4, "vragen": [{ "vraag_id": 5, "vraag": "Hoe gaat het?", "soortvraag_id": 4, "soortwaarde_id": 13, "verplicht": false, "antwoorden": [] }, { "vraag_id": 6, "vraag": "Dit is een kopje", "soortvraag_id": 18, "soortwaarde_id": 13, "verplicht": false, "antwoorden": [] }, { "vraag_id": 3, "vraag": "vraag 3k", "soortvraag_id": 6, "soortwaarde_id": 13, "verplicht": false, "antwoorden": [{ "antwoord": "nieuw2", "antwoord_id": 7, "vraag_id": 3, "iscorrect": true }, { "antwoord": "echt waar?", "antwoord_id": 5, "vraag_id": 3, "iscorrect": false }, { "antwoord": "nieuw 123", "antwoord_id": 2, "vraag_id": 3, "iscorrect": false }, { "antwoord": "nieuw", "antwoord_id": 6, "vraag_id": 3, "iscorrect": false }] }] } }

            // This doesn't work 
            $.ajax({
                        type: "POST",
                        contentType: "application/json",
                        url: "../formulierService.asmx/getLeegFormulier",
                        data: "{'id': " + 4 + "}",
                        dataType: "json",
                        success: function (result) {
                            alert(result.d); //content of alert was pasted into var test above
                            var ViewModel = ko.mapping.fromJS(result.d); 
                            ko.applyBindings(ViewModel);
                        }
            });

            // This does work
            var ViewModel2 = ko.mapping.fromJS(test);
            ko.applyBindings(ViewModel2);
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1 回答 1

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在这里，要使用 fromJS ，您需要将 json 字符串反序列化为 js 对象。

var test = JSON.parse(result.d);

然后，打电话

var ViewModel2 = ko.mapping.fromJS(test);

另一种选择是直接使用fromJSON, 而不是fromJS：

var ViewModel2 = ko.mapping.fromJSON(result.d);

于 2013-07-29T18:41:17.900 回答