Can&#180;t load mdbselect pro

Topic: Can´t load mdbselect pro

gabriel Julián premium asked 5 years ago

Hello, I´m trying to use a mdb-select pro in my project but I can´t load my data from my service. The problem is that the select doesn´t load any data.

first: I load the data in my variable optionSelect in a function cargarGamas() the code is: cargarGamas() { this.gamasService.getGamas() .pipe( map( (data: IGama[]) => { data.forEach ( (element) => { const item: IOptionSelect = { value: element._id, label: element.nombre }; this.optionsSelect.push(item); }); }) ); }

that code works fine.

second: I create the form, the code is:

this.daniosFormGroup = new FormGroup({
gama: new FormControl(''), modelo: new FormControl('', Validators.required) });

All code is executed in the onInit function

The html code is

I try waiting (setTimeout or subscribe) to load the data in the optionSelect array and then create the forms and this way load data but is show me and error that I attached, enter image description here Thanks Gabriel

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Damian Gemza staff answered 5 years ago

0 0 Best answer

Dear <a href="/profile/?id=51855" target="_blank" rel="nofollow">@gabriel Julián</a>

Okay, now I see this problem. Please use spread operator <code>...</code> instead of push. Our <code>mdb-select</code> lacks with dynamic recreating of the source array, so you need to use spread.

Please take a look at this code:

.component.ts:

<pre class="prettyprint"><code>optionsSelect: Array<any> = [];
 form: FormGroup = new FormGroup({
 select: new FormControl()
 });

constructor(private apiService: ApiService) {
  }

ngAfterViewInit() {
 setTimeout(() => {
 this.apiService.dataArray.forEach((el: any) => {
 this.optionsSelect = [...this.optionsSelect, el];
 })
 }, 3000);
 }
</code></pre>

api service:

<pre class="prettyprint"><code>private _dataArray: Array<any> = [
 { value: '1', label: 'Option 1' },
 { value: '2', label: 'Option 2' },
 { value: '3', label: 'Option 3' },
 ]
 get dataArray() {
 return this._dataArray;
 }
</code></pre>

The <code>setTimeout</code> in the component isn't needed.

Best Regards,

Damian

Please insert min. 20 characters.

Dear @gabriel Julián

Okay, now I see this problem. Please use spread operator ... instead of push. Our mdb-select lacks with dynamic recreating of the source array, so you need to use spread.

Please take a look at this code:

.component.ts:

optionsSelect: Array<any> = [];
  form: FormGroup = new FormGroup({
    select: new FormControl()
  });

  constructor(private apiService: ApiService) {
  }

  ngAfterViewInit() {
    setTimeout(() => {
      this.apiService.dataArray.forEach((el: any) => {
        this.optionsSelect = [...this.optionsSelect, el];
      })
    }, 3000);
  }

api service:

private _dataArray: Array<any> = [
    { value: '1', label: 'Option 1' },
    { value: '2', label: 'Option 2' },
    { value: '3', label: 'Option 3' },
  ]
  get dataArray() {
      return this._dataArray;
  }

The setTimeout in the component isn't needed.

Best Regards,

Damian

Add comment

Damian Gemza staff answered 5 years ago

0 0 Best answer

Dear <a href="/profile/?id=51855" target="_blank" rel="nofollow">@gabriel Julián</a>

I'm not able to debug your problem without the code, but I think, that you have wrongly created the form and form control for select.

Please take a look at the below code - that's how you should create Reactive Form (remember to import ReactiveFormsModule)

.html:

.ts:

<pre class="prettyprint"><code>import {Component} from '@angular/core';
import {FormControl, FormGroup} from "@angular/forms";

@Component({
 selector: 'app-root',
 templateUrl: './app.component.html',
 styleUrls: ['./app.component.scss']
})
export class AppComponent {
 form: FormGroup = new FormGroup({
 select: new FormControl()
 });
 optionsSelect = [
 { value: '1', label: 'Option 1' },
 { value: '2', label: 'Option 2' },
 { value: '3', label: 'Option 3' },
 ];
}
</code></pre>

Best Regards,

Damian

Please insert min. 20 characters.

Dear @gabriel Julián

I'm not able to debug your problem without the code, but I think, that you have wrongly created the form and form control for select.

Please take a look at the below code - that's how you should create Reactive Form (remember to import ReactiveFormsModule)

.html:

<form [formGroup]="form">
      <mdb-select formControlName="select" [options]="optionsSelect" placeholder="Choose your option"></mdb-select>
    </form>

.ts:

import {Component} from '@angular/core';
import {FormControl, FormGroup} from "@angular/forms";


@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
  form: FormGroup = new FormGroup({
    select: new FormControl()
  });
  optionsSelect = [
    { value: '1', label: 'Option 1' },
    { value: '2', label: 'Option 2' },
    { value: '3', label: 'Option 3' },
  ];
}

Best Regards,

Damian

gabriel Julián premium commented 5 years ago

Hello Damian, The imported is correct and if I initialize the optionSelect array like you, there is no problem. The problem appear when the values of the optionSelect loaded by a web service. The code is:

import {Component} from '@angular/core'; import {FormControl, FormGroup} from "@angular/forms";

@Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.scss'] }) export class AppComponent implements OnInit { daniosFormGroup: FormGroup = new FormGroup({ gama: new FormControl(''), modelo: new FormControl('', Validators.required), }); optionsSelect = [ ] = [ ];

ngOnInit() { this.loadData(); }

loadData() { this.gamasService.getGamas() .pipe( map( (data: IGama[]) => { data.forEach ( (element, index) => { const item: IOptionSelect = { value: element._id, label: element.nombre }; this.optionsSelect.push(item); }); }) ); } }

interface IOptionSelect { value: string; label: string; }

==============HTML============= CONTINUAR

If I execute this code, the select doesn´t load any data. The only way to load data is creating a subscription in the onInit like following code:

daniosFormGroup: FormGroup;

ngOnInit() { this.loadData().subscribe ( () => { this.daniosFormGroup = new FormGroup({ gama: new FormControl(''), modelo: new FormControl('', Validators.required), }); }; }

loadData() { return this.gamasService.getGamas() .pipe( map( (data: IGama[]) => { data.forEach ( (element, index) => { const item: IOptionSelect = { value: element._id, label: element.nombre }; this.optionsSelect.push(item); }); }) ); }

But it show me an error because the html stepper need a formGroup. Is the error that I attached you at first

Hello Damian, 
The imported is correct and if I initialize the optionSelect array like you, there is no problem.
The problem appear when the values of the optionSelect loaded by a web service.
The code is:

import {Component} from '@angular/core';
import {FormControl, FormGroup} from "@angular/forms";

@Component({
 selector: 'app-root',
 templateUrl: './app.component.html',
 styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit {
 daniosFormGroup: FormGroup = new FormGroup({
 gama: new FormControl(''),
 modelo: new FormControl('', Validators.required),
 });
 optionsSelect = [ ] = [ ];

ngOnInit() {
 this.loadData();
 }

loadData() {
 this.gamasService.getGamas()
 .pipe(
 map( (data: IGama[]) => {
 data.forEach ( (element, index) => {
 const item: IOptionSelect = {
 value: element._id,
 label: element.nombre
 };
 this.optionsSelect.push(item);
 });
 })
 );
 }
}

interface IOptionSelect {
 value: string;
 label: string;
}

==============HTML=============

CONTINUAR

If I execute this code, the select doesn´t load any data.
The only way to load data is creating a subscription in the onInit like following code:

daniosFormGroup: FormGroup;

ngOnInit() {
 this.loadData().subscribe ( () => {
 this.daniosFormGroup = new FormGroup({
 gama: new FormControl(''),
 modelo: new FormControl('', Validators.required),
 });
 };
 }

loadData() {
 return this.gamasService.getGamas()
 .pipe(
 map( (data: IGama[]) => {
 data.forEach ( (element, index) => {
 const item: IOptionSelect = {
 value: element._id,
 label: element.nombre
 };
 this.optionsSelect.push(item);
 });
 })
 );
 }

But it show me an error because the html stepper need a formGroup. Is the error that I attached you at first

Please insert min. 15 characters.

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Status

Answered

Specification of the issue

ForumUser: Premium
Premium support: Yes
Technology: MDB Angular
MDB Version: 7.5.1
Device: pc
Browser: chrome
OS: win
Provided sample code: No
Provided link: No

gabriel Julián

Premium support 32Support score
6Questions 0Answers 0Snippets