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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import {
Component,
computed,
inject,
input,
model,
OnInit,
output,
viewChild
} from '@angular/core';
import { AbstractControl, FormGroup } from '@angular/forms';
import { FormlyFieldConfig, FormlyForm, FormlyFormOptions } from '@ngx-formly/core';
import { FormlyJsonschema } from '@ngx-formly/core/json-schema';
import { JSONSchema7 } from 'json-schema';
@Component({
selector: 'si-formly',
// eslint-disable-next-line @angular-eslint/prefer-standalone
standalone: false,
templateUrl: './si-formly.component.html'
})
export class SiFormlyComponent<TControl extends { [K in keyof TControl]: AbstractControl }>
implements OnInit
{
/**
* Formly main container to provide modelChange subscriptions.
*/
readonly formlyForm = viewChild(FormlyForm);
readonly form = model<FormGroup<TControl>>();
/**
* Mapping of field name and its value.
*
* @defaultValue
* ```
* {}
* ```
*/
readonly model = model({});
/**
* Define FormlyFormOptions.
*
* @defaultValue
* ```
* {}
* ```
*/
readonly options = input<FormlyFormOptions>({});
/**
* JSONSchema7 can be used instead of FormlyFieldConfig array for defining form fields.
* */
readonly schema = model<JSONSchema7>();
/**
* Define all form fields with FormlyFieldConfig array.
*
* @defaultValue []
*/
readonly fields = input<FormlyFieldConfig[]>([]);
readonly fieldsChange = output<FormlyFieldConfig[]>();
/** Define width for field labels in pixel */
readonly labelWidth = input<number | undefined>();
protected readonly fieldConfig = computed<FormlyFieldConfig[]>(() => {
let formlyFieldConfig!: FormlyFieldConfig[];
const schema = this.schema();
const labelWidth = this.labelWidth();
const opts = {
map: (field: FormlyFieldConfig, s: JSONSchema7): FormlyFieldConfig => {
if (labelWidth) {
field.props ??= {};
field.props.labelWidth = labelWidth;
}
return field;
}
};
if (schema) {
formlyFieldConfig = [this.formlyJsonschema.toFieldConfig(schema, opts)];
} else {
formlyFieldConfig = this.fields();
}
if (formlyFieldConfig && formlyFieldConfig.length > 0) {
this.applyLabelWidth(formlyFieldConfig);
}
this.fieldsChange.emit(formlyFieldConfig);
return formlyFieldConfig;
});
protected ownForm = false;
private readonly formlyJsonschema = inject(FormlyJsonschema);
ngOnInit(): void {
if (!this.form()) {
this.ownForm = true;
this.form.set(new FormGroup<TControl>({} as TControl));
}
}
private applyLabelWidth(formlyFieldConfig: FormlyFieldConfig[]): void {
const apply = (cfg: FormlyFieldConfig[]): void => {
cfg.forEach(field => {
field.props ??= {};
field.props.labelWidth = this.labelWidth();
if (Array.isArray(field.fieldGroup)) {
apply(field.fieldGroup);
}
if (typeof field.fieldArray !== 'function') {
if (Array.isArray(field.fieldArray?.fieldGroup)) {
apply(field.fieldArray!.fieldGroup);
}
}
});
};
apply(formlyFieldConfig);
}
}
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