Ways to acquire a reference to a dynamically generated child element with an unknown name in JSON

JSON data is structured as follows:

"json": {
    "schema": {
      "type": "object",
      "title": "My Table",
      "properties": {
        "table-1659555454697": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "inputTest": {
                "type": "string"
              },
              "columnTwo": {
                "type": "string"
              }
            },
            "required": [
              "inputTest",
              "columnTwo"
            ]
          }
        }
      },
    },

To access the "table-1659555454697" object, you can use the following command:

console.log(this.jsf.schema.properties);

The challenge lies in obtaining the length of the "required" array within the children of that element, especially when the object is dynamically generated and cannot be referenced by name.

Attempts have been made with the following code:

 console.log(this.jsf.schema.properties[0].items[0].required.length);

However, this results in an undefined error.

Answer №1

For the task at hand, you may find Object.keys, Object.values, or Object.entries particularly handy. These methods supply an array containing the object's keys, values, and key-value pairs (in the form of [key, value] arrays).

const propertyNames = Object.keys(json.schema.properties) // ["table-1659555454697"]
const propertyValues = Object.values(json.schema.properties) // [{ type: "array", items: { ... }]
const propertyEntries = Object.entries(json.schema.properties)
// [ ["table-1659555454697", [{ type: "array", items: { ... }] ]

To accomplish your goal, you can use the following approach:

const requiredLength = Object.values(json.schema.properties)[0].items.required.length

Answer №2

To access the table-1659555454697, you can use the following code snippet:

Object.keys(this.jsf.schema.properties)[0]

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