API Reference@grafana/data › DataFrameView

DataFrameView class

This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

This abstraction will present the contents of a DataFrame as if it were a well typed javascript object Vector.

Signature

export declare class DataFrameView<T = any> extends FunctionalVector<T> 

Import

import { DataFrameView } from '@grafana/data';

Remarks

The DataFrameView.get() is optimized for use in a loop and will return same object. See function for more details.

Constructors

Constructor Modifiers Description
constructor(data) (BETA) Constructs a new instance of the DataFrameView class

Properties

Property Modifiers Type Description
dataFrame DataFrame (BETA)
length number (BETA)

Methods

Method Modifiers Description
get(idx) (BETA) The contents of the object returned from this function are optimized for use in a loop. All calls return the same object but the index has changed.
getFieldDisplayProcessor(colIndex) (BETA) Helper function to return the DisplayProcessor for a given field column.
toArray() (BETA)

This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

constructor(data)

Constructs a new instance of the DataFrameView class

Signature

constructor(data: DataFrame);

Parameters

Parameter Type Description
data DataFrame

This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

dataFrame property

Signature

get dataFrame(): DataFrame;

This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

length property

Signature

get length(): number;

This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

get method

The contents of the object returned from this function are optimized for use in a loop. All calls return the same object but the index has changed.

Signature

get(idx: number): T;

Parameters

Parameter Type Description
idx number The index of the object you currently are inspecting

Returns:

T

Example

  // `first`, `second` and `third` will all point to the same contents at index 2:
  const first = view.get(0);
  const second = view.get(1);
  const third = view.get(2);

  // If you need three different objects, consider something like:
  const first = { ...view.get(0) };
  const second = { ...view.get(1) };
  const third = { ...view.get(2) };

This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

getFieldDisplayProcessor method

Helper function to return the DisplayProcessor for a given field column.

Signature

getFieldDisplayProcessor(colIndex: number): DisplayProcessor | undefined;

Parameters

Parameter Type Description
colIndex number the field column index for the data frame.

Returns:

DisplayProcessor | undefined

This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

toArray method

Signature

toArray(): T[];

Returns:

T[]