Question

我有一个对象，我想从中提醒值“tr_name”

包含此值的对象位于：

[{"cells":[{"type":"basic.Rect","position":{"x":290,"y":450},"size":{"width":90,"height":54},"angle":0,"id":"0c53af29-a635-4e74-8759-6d31472e0ffb","embeds":"","z":1,"wi_name":"","wi_displayName":"","wi_description":"","wi_join":"<None>","wi_split":"<None>","wi_performingUser":"","wi_workitem_variables":"","wi_expected_activity_time":null,"wi_expected_user_time":null,"wi_maximum_activity_time":null,"wi_initial_delay":null,"wi_time_unit":"Seconds","wi_required_transitions_for_AND_JOIN":null,"wi_custom_page":"","attrs":{"rect":{"fill":"#0000ff","width":50,"height":30,"rx":2,"ry":2,"stroke-width":1,"stroke-dasharray":"0"},"text":{"fill":"#ffffff","text":"Activity","font-size":10,"font-family":"Arial","stroke":"#000000","stroke-width":0,"font-weight":400}}},{"type":"link","source":{"id":"0c53af29-a635-4e74-8759-6d31472e0ffb"},"target":{"x":720,"y":480},"id":"7086cf67-2254-4113-a9ca-564d4dd8c0f9","embeds":"","z":2,"smooth":false,"manhattan":false,"labels":[],"attrs":{".marker-source":{"d":"M 10 0 L 0 5 L 10 10 z","transform":"scale(1)","fill":"#000000"},".marker-target":{"d":"M 10 0 L 0 5 L 10 10 z","transform":"scale(1)","fill":"#000000"},".connection":{"stroke":"#000000","stroke-width":1,"stroke-dasharray":"0"},".attributes":{"tr_name":"AAAAAAAAAAAAAAA","tr_description":"","tr_rules":"Rule 1","tr_value":"true","tr_rule_source":"BPM"}}}]},"{}","{}","{}","{}","{}"]

到目前为止，我尝试了这样的警报而没有结果：

var selectedObjectDataText = JSON.stringify(this.selection.invoke('toJSON'));
var selectedObjectDataJSON = JSON.parse(selectedObjectDataText);
alert(selectedObjectDataJSON[0].[".attributes"]["tr_name"]);

我该怎么办呢？

Answer 1

您有一个JavaScript对象，您可以按如下方式获取tr_name的值（我已经使用JSON格式化程序格式化了您提供的JSON）。

您不需要使用JSON.stringify和JSON.parse，他们会执行以下操作

JSON.stringify将JavaScript对象转换为JSON文本，并将该JSON文本存储在字符串中。

JSON.parse将一串JSON文本转换为JavaScript对象。

＆＃13;

var json = [
   {
      "cells":[
         {
            "type":"basic.Rect",
            "position":{
               "x":290,
               "y":450
            },
            "size":{
               "width":90,
               "height":54
            },
            "angle":0,
            "id":"0c53af29-a635-4e74-8759-6d31472e0ffb",
            "embeds":"",
            "z":1,
            "wi_name":"",
            "wi_displayName":"",
            "wi_description":"",
            "wi_join":"<None>",
            "wi_split":"<None>",
            "wi_performingUser":"",
            "wi_workitem_variables":"",
            "wi_expected_activity_time":null,
            "wi_expected_user_time":null,
            "wi_maximum_activity_time":null,
            "wi_initial_delay":null,
            "wi_time_unit":"Seconds",
            "wi_required_transitions_for_AND_JOIN":null,
            "wi_custom_page":"",
            "attrs":{
               "rect":{
                  "fill":"#0000ff",
                  "width":50,
                  "height":30,
                  "rx":2,
                  "ry":2,
                  "stroke-width":1,
                  "stroke-dasharray":"0"
               },
               "text":{
                  "fill":"#ffffff",
                  "text":"Activity",
                  "font-size":10,
                  "font-family":"Arial",
                  "stroke":"#000000",
                  "stroke-width":0,
                  "font-weight":400
               }
            }
         },
         {
            "type":"link",
            "source":{
               "id":"0c53af29-a635-4e74-8759-6d31472e0ffb"
            },
            "target":{
               "x":720,
               "y":480
            },
            "id":"7086cf67-2254-4113-a9ca-564d4dd8c0f9",
            "embeds":"",
            "z":2,
            "smooth":false,
            "manhattan":false,
            "labels":[

            ],
            "attrs":{
               ".marker-source":{
                  "d":"M 10 0 L 0 5 L 10 10 z",
                  "transform":"scale(1)",
                  "fill":"#000000"
               },
               ".marker-target":{
                  "d":"M 10 0 L 0 5 L 10 10 z",
                  "transform":"scale(1)",
                  "fill":"#000000"
               },
               ".connection":{
                  "stroke":"#000000",
                  "stroke-width":1,
                  "stroke-dasharray":"0"
               },
               ".attributes":{
                  "tr_name":"AAAAAAAAAAAAAAA",
                  "tr_description":"",
                  "tr_rules":"Rule 1",
                  "tr_value":"true",
                  "tr_rule_source":"BPM"
               }
            }
         }
      ]
   },
   "{}",
   "{}",
   "{}",
   "{}",
   "{}"
];

var result = json[0].cells[1]['attrs']['.attributes']['tr_name'];
console.log(result);

＆＃13;

Answer 2

您的数据路径不完整。

<强>说明

JSON方法

JSON.parse将字符串（JSON格式化）转换为 JSON对象
JSON.stringify将 JSON对象转换为字符串

ALERT JSON

对于单个JSON值，您只需编写完整的JSON数据路径（不需要JSON.stringify） alert(selectedObjectDataJSON[0].cells[1].attrs['.attributes'].tr_name);
对于 JSON对象，您需要JSON.stringify之前alert alert(JSON.stringify(selectedObjectDataJSON[0].cells[1].attrs['.attributes']);

LIVE DEMO

https://jsfiddle.net/Ldmrn0fu/

如何提醒对象内部的值

2 个答案: