How can I present the enum type in a dropdown menu using Angular 5 and TypeScript?

Question

How can I present the enum type in a dropdown menu using Angular 5 and TypeScript?

In my Angular 5 application, I have defined an enumeration constant called DateRange.

export enum DateRange {
  TODAY = 'Today',
  THIS_WEEK = 'This Week',
  THIS_MONTH = 'This Month',
  THIS_YEAR = 'This Year'
}

I am looking for a way to display this enumeration in a select box within my component's HTML. Any suggestions on how to achieve this?

The desired output would be:

<select> 
  <option value="TODAY"> Today </option>
  <option value="THIS_WEEK"> This Week</option>
  <option value="THIS_MONTH"> This Month </option>
  <option value="THIS_YEAR"> This Year </option>
</select>

angular typescript

Answer 1

Answer №1

Explain the code snippet below in your HTML file:

<select> 
   <option *ngFor="let selection of Object.keys(selections)" [ngValue]="selection">{{selections[selection]}}</option>
</select>

Implement the following in your component:

selections = SelectionOptions;

Answer 2

Explain the code snippet below in your HTML file:

<select> 
   <option *ngFor="let selection of Object.keys(selections)" [ngValue]="selection">{{selections[selection]}}</option>
</select>

Implement the following in your component:

selections = SelectionOptions;

Answer 3

Answer №2

To populate your dropdown with the keys of an enum, you can iterate through them and use them as values like so:

<select> 
  <option [value]="key" *ngFor="let key of getKeys(EnumName)">{{ EnumName[key] }}</option>
</select>

In your component.ts file, make sure to include the getKeys function:

getKeys(obj: any) { return Object.keys(obj); }

Also, remember that the enum itself must be a part of this component...

Answer 4

To populate your dropdown with the keys of an enum, you can iterate through them and use them as values like so:

<select> 
  <option [value]="key" *ngFor="let key of getKeys(EnumName)">{{ EnumName[key] }}</option>
</select>

In your component.ts file, make sure to include the getKeys function:

getKeys(obj: any) { return Object.keys(obj); }

Also, remember that the enum itself must be a part of this component...

Answer 5

Answer №3

You have the option to transform an enum into a JavaScript object.

Object.values(DateRange); // [ 'Today', 'This Week', 'This Month', 'This Year']
Object.keys(DateRange); // [ 'TODAY', 'THIS_WEEK', 'THIS_MONTH', 'THIS_YEAR' ]

Now, you can display it using *ngFor directive.

Answer 6

You have the option to transform an enum into a JavaScript object.

Object.values(DateRange); // [ 'Today', 'This Week', 'This Month', 'This Year']
Object.keys(DateRange); // [ 'TODAY', 'THIS_WEEK', 'THIS_MONTH', 'THIS_YEAR' ]

Now, you can display it using *ngFor directive.

Answer 7

Answer №4

Implement the following code snippet within your component:

const availableDateRanges = Object.keys(DateRange).map(key => DateRange[key]);
const defaultSelectedDateRange: DateRange = availableDateRanges[0];

Next, embed it in your template like so:

<mat-form-field> 
    <mat-select placeholder="Select Date Range" [(value)]="defaultSelectedDateRange">
        <mat-option *ngFor="let range of availableDateRanges" [value]="range">
            {{ range }}
        </mat-option>
    </mat-select>
</mat-form-field>

Answer 8

Implement the following code snippet within your component:

const availableDateRanges = Object.keys(DateRange).map(key => DateRange[key]);
const defaultSelectedDateRange: DateRange = availableDateRanges[0];

Next, embed it in your template like so:

<mat-form-field> 
    <mat-select placeholder="Select Date Range" [(value)]="defaultSelectedDateRange">
        <mat-option *ngFor="let range of availableDateRanges" [value]="range">
            {{ range }}
        </mat-option>
    </mat-select>
</mat-form-field>

How can I present the enum type in a dropdown menu using Angular 5 and TypeScript?

Answer №1

Answer №2

Answer №3

Answer №4

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