CODEWITHSUNDEEP
angularselectbinding
Lea
Lea

Reputation: 1285

Angular2 [selected] does not work to set up the default value?

I'm trying to set up default value for my selection so I tried 

[selected]= "selected_choice == 'one'"

something like this

but this didn't work.

People said [selected] no longer works so I also tried [attr.selected] but didn't work as well..

this is my whole code for one select tag

  <select (change)="passValue3()" formControlName="school" class="form-control" required [(ngModel)]="selected_student" class="selectionbox">
    <option *ngIf="selected_student == undefined">학년 선택</option>
    <option *ngFor="let gradetype of gradeTypes" [ngValue]="gradetype" [attr.selected] = "gradetype.gradeType === 'Middle'">{{gradetype.gradeName}}</option>
</select>

How can I set up the default option for the select?

Upvotes: 6

Views: 5754

Answers (3)

Vinit Solanki
Vinit Solanki

Reputation: 2033

you compare options to select by compareWith property, If you are using angular 4, may be it will not working on angular 2.

HTML File : 

<select [compareWith]="byAnimal" [(ngModel)]="selectedAnimal">  
  <option *ngFor="let animal of animals" [ngValue]="animal">
    {{animal.type}}
  </option>
</select>

TS File

byAnimal(item1,item2){
  return item1.type == item2.type;
}

One of the best solution from this link

Upvotes: 3

Experimenter
Experimenter

Reputation: 2477

Here is my solution:

Example is about time zones. From the backend I got the next object item:

activeItem = { "timezone": { "timeZoneHolder": "Europe", "region": "Europe/Paris (CEST)", "UTC": "UTC+1"  }}

And the same item from my model looks a little bit different as source is change: 

{ "timeZoneHolder": "France", "region": "Europe/Paris", "UTC": "UTC +01:00" }

As you see a little bit different.

So here is my model: 

timeZones = [{ "timeZoneHolder": "France", "region": "Europe/Paris", "UTC": "UTC +01:00" }, { "timeZoneHolder": "French Polynesia", "region": "Pacific/Gambier", "UTC": "UTC -09:00" }]

And here is the mark-up for the select, works like a charm : 

<select id="timezone" name="timezone" [(ngModel)]="activeItem.timezone">
<option [ngValue]="activeItem.timezone" [selected]="true" disabled hidden>{{activeItem.timezone.region}}</option>
<option *ngFor="let timeZone of timeZones"
        [ngValue]="{timeZoneHolder: timeZone.countryName, region: timeZone.timeZone, UTC: timeZone.UTC}">
    {{timeZone.timeZone}}
</option>

Enjoy :)

Upvotes: 0

Ketan Akbari
Ketan Akbari

Reputation: 11287

You need to do something like this:

In Markup:

<select placeholder="Sample select" [(ngModel)]="selectedItem">
                    <option [value]="'all'">View All</option>
                    <option [value]="'item-1'">Item-1</option>
                    <option [value]="'item-2'">Item-2</option>
                </select>

In Component

  selectedItem='all'

Upvotes: 8

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