Issue with ion-select default value not being applied

Question

Issue with ion-select default value not being applied

In my ion-select element, I have multiple options and I want to set a default value based on the CurrentNumber when the view is loaded. Here's the code snippet:

<ion-select formControlName="Level">
          <ion-option [value]="level.id" *ngFor="let level of levels" [attr.selected]="(level.levelNumber == currentLevel)? true : null">
             {{level.name}}
          </ion-option>
</ion-select>

this.currentLevel = 1;

The data received from the server looks like this:

data = [
 {
  levelNumber : 1,
  name:'abcd'
 },
 {
levelNumber:2,
name:'efg'
 }
]

angular typescript ionic2 ionic3

Answer 1

Answer №1

Instead of using the selected attribute, you have the option to specify the default selection in the form control once the data has been loaded:

// Once the data is loaded
this.yourForm.get('Level').setValue(data.id);

This code will automatically set the option with an id matching data.id as the default selection.

Answer 2

Instead of using the selected attribute, you have the option to specify the default selection in the form control once the data has been loaded:

// Once the data is loaded
this.yourForm.get('Level').setValue(data.id);

This code will automatically set the option with an id matching data.id as the default selection.

Answer 3

Answer №2

Discovering a solution using the placeholder

<ion-select id="genderInput" [formControl]="gender" [placeholder]="gender.value.toUpperCase() | translate">
   <ion-option value="female">{{ 'FEMALE' | translate }}</ion-option>
   <ion-option value="male">{{ 'MALE' | translate }}</ion-option>
</ion-select>

Additionally, implementing the following styles to customize the default color of a placeholder

ion-select {
   div.select-text.select-placeholder {
      color: get-color(black) !important;
   }
}

Hopefully this proves helpful :)

Answer 4

Discovering a solution using the placeholder

<ion-select id="genderInput" [formControl]="gender" [placeholder]="gender.value.toUpperCase() | translate">
   <ion-option value="female">{{ 'FEMALE' | translate }}</ion-option>
   <ion-option value="male">{{ 'MALE' | translate }}</ion-option>
</ion-select>

Additionally, implementing the following styles to customize the default color of a placeholder

ion-select {
   div.select-text.select-placeholder {
      color: get-color(black) !important;
   }
}

Hopefully this proves helpful :)

Answer 5

Answer №3

Also worth noting is this example directly sourced from here

 * ### Object Value References
 *
 * When using objects as select values, it's possible for the identities of these objects to change, especially if they are fetched from a server or database. The selected value may have the same identity while the actual object has changed. For instance, when an existing record with the desired object value is initially loaded into the select, subsequent options retrieved could have different identities. This leads to the select seemingly having no value, even though the original selection remains intact.
 *
 * Implementing the `compareWith` `Input` resolves this issue.
 *

 <ion-item>
   <ion-label>Employee</ion-label>
   <ion-select [(ngModel)]="employee" [compareWith]="compareFn">
     <ion-option *ngFor="let employee of employees" [value]="employee">{{employee.name}}</ion-option>
   </ion-select>
 </ion-item>

 compareFn(e1: Employee, e2: Employee): boolean {
   return e1 && e2 ? e1.id === e2.id : e1 === e2;
 }

Answer 6

Also worth noting is this example directly sourced from here

 * ### Object Value References
 *
 * When using objects as select values, it's possible for the identities of these objects to change, especially if they are fetched from a server or database. The selected value may have the same identity while the actual object has changed. For instance, when an existing record with the desired object value is initially loaded into the select, subsequent options retrieved could have different identities. This leads to the select seemingly having no value, even though the original selection remains intact.
 *
 * Implementing the `compareWith` `Input` resolves this issue.
 *

 <ion-item>
   <ion-label>Employee</ion-label>
   <ion-select [(ngModel)]="employee" [compareWith]="compareFn">
     <ion-option *ngFor="let employee of employees" [value]="employee">{{employee.name}}</ion-option>
   </ion-select>
 </ion-item>

 compareFn(e1: Employee, e2: Employee): boolean {
   return e1 && e2 ? e1.id === e2.id : e1 === e2;
 }

Answer 7

Answer №4

In situations where your choices are fixed as opposed to changing, you can follow these steps:

In your TypeScript file:

this.optionsForm = this.formBuilder.group({
      choiceName: ['StaticValue', Validators.required]
    });

In your HTML:

<ion-select formControlName='choiceName' value='StaticValue'>
    <ion-select-option value='StaticValue'>Option 1</ion-select-option>
    <ion-select-option value='OtherStaticValue'>Option 2</ion-select-option>
 </ion-select>

Answer 8

In situations where your choices are fixed as opposed to changing, you can follow these steps:

In your TypeScript file:

this.optionsForm = this.formBuilder.group({
      choiceName: ['StaticValue', Validators.required]
    });

In your HTML:

<ion-select formControlName='choiceName' value='StaticValue'>
    <ion-select-option value='StaticValue'>Option 1</ion-select-option>
    <ion-select-option value='OtherStaticValue'>Option 2</ion-select-option>
 </ion-select>

Answer 9

Answer №5

To implement this functionality, you can follow these steps:

For HTML -

<ion-select formControlName="Level">
      <ion-option [value]="level.id" *ngFor="let level of levels" >
         {{level.name}}
      </ion-option>
</ion-select>

And for TypeScript -

__formGroupInstance  : FormGroup

this.__formGroupInstance  = this.formBuilder.group({
Level: this.currentLevel 
})

Answer 10

To implement this functionality, you can follow these steps:

For HTML -

<ion-select formControlName="Level">
      <ion-option [value]="level.id" *ngFor="let level of levels" >
         {{level.name}}
      </ion-option>
</ion-select>

And for TypeScript -

__formGroupInstance  : FormGroup

this.__formGroupInstance  = this.formBuilder.group({
Level: this.currentLevel 
})

Answer 11

Answer №6

Below is a way to accomplish this:

<ion-select formControlName="Level">
  <ion-option *ngFor="let level of levels" value="{{level.id}}" [selected]="level.levelNumber == currentLevel">
    {{level.name}}
  </ion-option>
</ion-select>

Answer 12

Below is a way to accomplish this:

<ion-select formControlName="Level">
  <ion-option *ngFor="let level of levels" value="{{level.id}}" [selected]="level.levelNumber == currentLevel">
    {{level.name}}
  </ion-option>
</ion-select>

Issue with ion-select default value not being applied

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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