Get index of enum value typescript

Question

I have the following string enum:

export enum RecordStatus {
   ONGOING_ADMINISTRATIVE_ANALYSIS = 'ONGOING_ADMINISTRATIVE_ANALYSIS',

   ONGOING_TECHNICAL_ANALYSIS = 'ONGOING_TECHNICAL_ANALYSIS',

   COMPLETED_APPLICATION = 'COMPLETED_APPLICATION'
}

I have the following function:

setTimelineStatus(status: RecordStatus) : void {
    console.log("State :" + status); // ON_GOING_TECHNICAL_ANALYSIS

    console.log(RecordStatus.valueOf(status).ordinal()); // doesn't work. Should print 1

    console.log(RecordStatus.valueOf("ON_GOING_TECHNICAL_ANALYSIS").ordinal()); // doesn't work either. Should print 1
}

This function retrieves a set enum as parameter, for example RecordStatus.ON_GOING_TECHNICAL_ANALYSIS. I want to get the index (it should be 1 in above case). I tried the solution in this thread Get index of enum from string? but I've got this error:

I don't understand why I have this error. I only want the index of the enum value.

Does this answer your question? How do I access Typescript Enum by ordinal — mwilson
– mwilson, Commented Jul 23, 2020 at 0:26

Gass · Accepted Answer · 2023-01-24 13:34:28Z

18

The post you are refering to is for enums in Java.

In TypeScript, enum are considered objects at runtime so you can just iterate over the keys of the enum until you find the one you're looking for.

Object.keys(RecordStatus).indexOf('ON_GOING_TECHNICAL_ANALYSIS');

edited Jan 24, 2023 at 13:34

Gass

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answered Jul 23, 2020 at 0:22

saulmaldonado

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2 Comments

Héloïse Chauvel Over a year ago

I didn't see it was Java! It works with console.log(Object.keys(RecordStatus).indexOf(status)); (the parameter), however when I try with your suggestion I get -1. But it doesn't matter, I have the solution, thanks!

Daniel W Strimpel Over a year ago

@HéloïseChauvel the reason you are getting -1 is because it is incorrectly spelled. It should be ONGOING_TECHNICAL_ANALYSIS (note the _ that is removed after ON), based on your enum stated above.

Valentine Shi · Accepted Answer · 2023-07-19 07:13:58Z

2

This code returns the index of enum item. Besides it TypeScript-guarded, i.e. would not allow to make a mistake in the enum item identifier, provided your IDE supports TypeScript:

Object.values(RecordStatus).indexOf(RecordStatus.ONGOING_ADMINISTRATIVE_ANALYSIS)

edited Jul 19, 2023 at 7:13

Valentine Shi

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answered Feb 26, 2023 at 8:06

HamidReza

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