CODEWITHSUNDEEP
angular5primengprimeng-dropdowns
Bhagvat Lande
Bhagvat Lande

Reputation: 1480

How to set default value for PrimeNG p-dropdown

I am using PrimeNG in my angular5 app. I have issue with p-dropdown

Question

I have p-dropdown for showing countries. I bind the select options correctly there it works fine (this data coming from api), but I need to set default selected option for this p-dropdown as "India".

I set up ng-model value as India but it didn't work.

my dummy.component.html code

<div class="form-group col-md-2">
    <div>
        <label for="inputEmail4"> Select Country</label>
        <span style="color:red">*</span>
    </div>
    <p-dropdown name="country" [options]="countries" [(ngModel)]="applicant.country" placeholder="select country"
            (onChange)="getStatebyCountry(applicant.country,$event)" #country="ngModel" required>
    </p-dropdown>
    <span *ngIf="country.invalid && (country.dirty || country.touched)">
        <span [hidden]="!country.hasError('required')" style="color:#ffa500">country is mandatory</span>
    </span>
</div>

my dummy.component.ts

export class dummyComponent implements OnInit {
    //variable declaration scope for all controller function
    applicant: any = {};

    country: string; constructor() { }

    ngOnInit() {
        this.applicant.country = 'India';
    } 
    this.countries = [];
    // this.countries.push({ label: 'Select Country', value: '' });
    //getallcountries
    this.UserService.getallcountries().subscribe(result => {
    console.log("countries" + result);
    this.cnt = result;
    for (let i = 0; i <= this.cnt.length; i++) {
        if (this.cnt[i].id === 1) {
            this.countries.push({ label: this.cnt[i].name, value: this.cnt[i].id });
        }
    }
});

Upvotes: 32

Views: 153394

Answers (15)

James Siva
James Siva

Reputation: 1313

<p-dropdown
--------
[placeholder]="yourArray[1].value"
--------
/>
</p-dropdown>

Upvotes: 0

Murat Yıldız
Murat Yıldız

Reputation: 12022

You can set default value of PrimeNG Dropdown by using ngModel as shown on the following approach:


***component.html:*** 
<p-dropdown [options]="cities" name="selectedCity" [(ngModel)]="selectedCity"></p-dropdown>

***component.ts:*** 
selectedCity: string = 1; //Id value of the City to be selected

If it is not fixed due to version problems, try this: 
this.cities.value = this.selectedCity;

Upvotes: 5

Suma
Suma

Reputation: 53

primeng dropdown doesn't know what value to set if you don't add 'optionValue'. To set a default value, we must add optionValue="value" in p-dropdown like this:

<p-dropdown [options]="cities" [(ngModel)]="selectedCityCode" optionLabel="name" formControlName="city" optionValue="value"></p-dropdown>

In .ts file:

FormGroup.controls.city.setValue('cityCode');

Hope this helps someone.

Upvotes: 1

ScottDPJ
ScottDPJ

Reputation: 443

Angular 13 with PrimeNg 13.

The answer was simple:

<p-dropdown *ngIf="isReady" [options]="offices" [(ngModel)]="selectedOffice" optionLabel="name" ></p-dropdown>

Component.ts
this.selectedOffice = this.offices.find(o => o.id === id);
this.isReady = true;

The trick was setting the this.isReady boolean and then putting the *ngIf on the p-dropdown. The dropdown does not seem to respond to changes in value from the code side, so this forces it to no display the dropdown until you have selected which item is the current value.

Upvotes: 1

Garvit Jain
Garvit Jain

Reputation: 2112

<p-dropdown name="country"
    
    optionLabel="label"
    optionValue="value"

    [options]="countries"
    [(ngModel)]="applicant.country"
    placeholder="select country"
    (onChange)="getStatebyCountry(applicant.country,$event)"     
    #country="ngModel" required>
</p-dropdown>

Just specify name optionLabel and optionValue.

The data is { label: this.cnt[i].name, value: this.cnt[i].id }

So the label key's value will be used for display and value key's value will be used in ngModel.

Upvotes: 4

Bidisha Das
Bidisha Das

Reputation: 402

You can also try this. Let's say, your dropdown looks like this:

     <p-dropdown
      class="iteration-dropdown"
      [options]="cities"
      [(ngModel)]="selectedCity"
      name="selectedCity"
      (onChange)="loadIterationFeatures()"
     ></p-dropdown>

On ngOnInit, do this:

 this.selectedCity = this.select;
 this.cities = [{label: this.select, value: this.id}]

Where select and id are supposedly the default label and value.

Upvotes: 0

Rams
Rams

Reputation: 1

your 'selectedCountry' must have all key that your countries element have

Upvotes: 0

user7070123
user7070123

Reputation: 51

Replacement solution, try using:

[placeholder]="yourSelectedObject.Field"

Upvotes: 5

Dheeraj Kumar
Dheeraj Kumar

Reputation: 4175

Update in PrimgNg

While setting default value for dropdown in Primeng need to be little careful.

<p-dropdown name="country" [options]="countries" [(ngModel)]="country" placeholder="select country" (onChange)="changeCountry()"></p-dropdown>

country should be a number not string.

You can typecast it, if it is a string.

country: Number("1");

Upvotes: 0

user1662833
user1662833

Reputation: 339

This may be caused if PrimeNG doesn't know to which field to bind the "selectedCountry", ie. your "countries" model for the dropdown control has more then key and value properties.

In my case, I had to explicitly "tell" to each dropdown field that the property for values is "value". I used the p-dropdown dataKey property for this.

So, in my dropdown control, I added something like this:

<p-dropdown dataKey="value" ></p-dropdown>

You can read more here.

Upvotes: 23

Neamesis
Neamesis

Reputation: 744

I just had a similar problem. I solved this with the html attribute "optionLabel". If we read the PrimeNG documentation it says this : Name of the label field of an option when an arbitrary objects instead of SelectItems are used as options.

Official documentation

Hope it helps

Upvotes: 0

GustavoTM
GustavoTM

Reputation: 505

I been having this issue too and after several minutes debugging, I have found that some of the common reason for this problem can be:

1) Type mismatch - The drop-down can be binding to integers and [(ngModel)] property can be an string.

For example:

<p-dropdown [options]="countries" [(ngModel)]="selectedCountry"></p-dropdown>

Where

countries = [1,2,3]

and

selectedCountry = '1'

2) Uppercase- Lower-Case - The drop-down can be binding to an string that is lower case and [(ngModel)] property can be on Uppercase or a combination of both.

For example: 

countries = ['United States', 'England', 'Bolivia']

and

selectedCountry = 'united states'

It has to be an exact match to work as expected, in this case 'United States'

Upvotes: 2

makkasi
makkasi

Reputation: 7288

My solution was to have the countries loaded in the controller before setting the form field (ngModel or formControl). Also keep the same type of the key. Don't use number for the form control and string for the list:

// first get the cities from the server
response.cities.forEach(city => {
                      this.dropdowns['cities'].push({ value: city.id, label: element.city }); });

// when setting the form
city_id: new FormControl(this.user.city_id)

In the code above this.user.city_id and city.id has the same type number

Upvotes: 1

chou
chou

Reputation: 31

I use this solution to fix this

html:

<p-dropdown name="country" [options]="countries" [(ngModel)]="country" placeholder="select country" (onChange)="changeCountry()"></p-dropdown>

ts:

    public country;
    public countries;
    ngOnInit() {
        this.applicant.country = 'India';
        this.getCountry().then(()=>{
          this.country = this.applicant.country
        })
    } 
    getCountry(){
      return new Promise( (resolve,reject) => {
        this.UserService.getallcountries().subscribe(result => {
          this.cnt.forEach(element => {
            this.countries.push({
              label: element.name,
              value: element.id
            });
          });
          resolve();
        }, error =>{
          reject();
        });
      })          
    }
    changeCountry(){
     this.country = this.applicant.country;
    }

it work at primeng 6.1.3

Upvotes: 0

Antikhippe
Antikhippe

Reputation: 6655

Try to replace 

this.applicant.country = 'India';

with 

this.applicant = {country: 'India'};

Edit

Display your p-dropdown once you got the data from your API.

<div *ngIf="dataLoaded">
  <p-dropdown [options]="countries" [(ngModel)]="applicant.country"></p-dropdown>
</div>

See Plunker

Upvotes: 9

Related Questions