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evalProviderJsonPath

evalProviderJsonPath​

Reads a value from a Provider Instance's current response data using a JSONPath expression.

Parameters

  • recvPath (dynamic): The name of the Provider Instance to query
  • regularPath (String): The JSONPath expression (e.g. "$.list[0].name")

Returns: List — the value matching the JSONPath, or null if the path does not exist

Description

Use it when you need to extract only the value at a specific path, more precisely than getProviderData allows. Internally it uses the PI's blockPath evaluation engine.

Example

// PI 응답에서 첫 번째 항목의 이름 추출
var name = $vm.evalProviderJsonPath("stockProvider", "$.list[0].name");
$log.i("첫 항목:", name);

// 전체 리스트 추출
var list = $vm.evalProviderJsonPath("stockProvider", "$.list");
$log.i("항목 수:", list ? list.length : 0);

Related

  • $vm.getProviderData(path) — read a PI's full data
  • $vm.getPiResultValue(piName, blockPath) — read a value from the last response (onResponseUpdate only)