如何解析嵌套的JSON对象数组? [英] How to parse nested JSON object arrays?

问题描述

我们正在为WeClapp( https://www.weclapp.com/api2/).WeClapp中的自定义属性可以添加到几乎所有数据类型中.这些属性可通过嵌套的JSON对象数组访问.

We're writing an Extension for WeClapp (https://www.weclapp.com/api2/). Custom Attributes in WeClapp could be added to almost all Datatypes. These Attributes are accessible over a nested JSON object Array.

接口示例:

export interface ICustomAttribute {
    attributeDefinitionId: string;
    booleanValue?: boolean;
    dateValue?: number;
    entityId?: string;
    numberValue?: number;
    selectedValueId?: string;
    stringValue?: string;
}

export interface IContact {
    id: string;
    ...
    customAttributes: ICustomAttribute[];
    email: string;
    ...
} 

响应示例:

{
  "id": "4317",
  ...
  "customAttributes": [
    {
      "attributeDefinitionId": "4576",
      "booleanValue": null,
      "dateValue": null,
      "entityId": null,
      "numberValue": null,
      "selectedValueId": null,
      "selectedValues": null,
      "stringValue": "Test"
    },
    {
      "attributeDefinitionId": "69324",
      "booleanValue": true,
      "dateValue": null,
      "entityId": null,
      "numberValue": null,
      "selectedValueId": null,
      "selectedValues": null,
      "stringValue": null
    }
  ],
  ...
  "email": "[e-mail]",
  ...
}

访问IContact(在下面的示例中为联系人)属性没有问题，期望使用 [customAttributes] 属性.如何访问和处理数据?

There is no Problem accessing the IContact (contact in the following example) properties expect the [customAttributes] property. How can I access and manipulate Data?

在以下示例中， contact = IContact :

console.log(contact);

输出:

[
  {
    id: '102570',
    ...
    customAttributes: [ [Object], [Object], [Object], [Object] ],
    ...
  }
]

console.log(contact.id); //Outputs: 102570
console.log(contact.customAttributes); //Outputs: undefined

JavaScript数组扩展( length ， ForEach ，...)在 [contact.customAttributes] 上不可用，因为它是未定义:

JavaScript Array Extensions (length, ForEach, ...) are not available on [contact.customAttributes], because it's undefined:

let attributes = new Array(0);
attributes = attributes.concat(record.customAttributes);

console.log(attributes); // Outputs: [undefined]

我也尝试更改界面并尝试重新解析:

I also tried to Change the interface and tried to reparse:

export interface IContact {
    id: string;
    ...
    customAttributes: string;
    email: string;
    ...
} 

...

let attributes Array<ICustomAttribute>  = JSON.Parse(record.customAttributes);

我不知道为什么无法访问该阵列.最奇怪的是设置属性不会引发任何错误:

I have no idea why I can't Access the Array. The strangest thing is that setting attributes does not throw any errors:

let attribute: ICustomAttribute = { attributeDefinitionId: "4576", stringValue: "Test" };
let contact = { customAttributes: [attribute] };

此新条目可以过帐并返回，如上所示.

This new entry could be posted and Returns as shown above.

JSON.stringify(contact)的输出:

[{"id":"102871",...,"customAttributes":[{"attributeDefinitionId":"4229"},{"attributeDefinitionId":"46381"},{"attributeDefinitionId":"69316"},{"attributeDefinitionId":"98781","stringValue":"77b5d0f1-b1a4-4957-8ea2-ea95969e3c03"}],...,"email":"[e-mail]"}]

console.log(contact ["customAttributes"])的输出是 undefined .

Output of console.log(contact["customAttributes"]) is undefined.

推荐答案

如果您的 console.log(联系人)产生:

[
  {
    id: '102570',
    ...
    customAttributes: [ [Object], [Object], [Object], [Object] ],
    ...
  }
]

这表明 contact.customAttributes 不存在. contact 是一个对象数组，要到达第一个对象，您需要 contact [0] .customAttributes

Then this suggests that contact.customAttributes does not exist. contact is an array of objects, and to reach the first, you would need contact[0].customAttributes

这篇关于如何解析嵌套的JSON对象数组?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！