ngx-mat-dynamic-form-builder
Version:
Build dynamic forms in Angular Material using Reactive forms.
118 lines • 16.2 kB
JavaScript
import { Component, Input, Output, EventEmitter } from '@angular/core';
import { QuestionControlService } from '../services/question-control.service';
export class DynamicFormComponent {
constructor(qcs) {
this.qcs = qcs;
this.questions = [];
this.emitOnlyOnChange = false;
this.formResult = new EventEmitter();
}
ngOnInit() {
if (!this.questions || this.questions.length === 0) {
console.error('Questions are null or empty.');
return;
}
this.form = this.qcs.toFormGroup(this.questions);
// Emit if the form is valid from begining but not if on change flag is set.
if (!this.emitOnlyOnChange && this.form.valid) {
this.emitForm();
}
this._buttonText = this.buttonText || 'Save';
this.prepareConditionalControls();
this.prepareFilteredOptions();
this.form.statusChanges.subscribe(status => {
if (status === 'VALID') {
this.emitForm();
}
else {
this.formResult.emit(null);
}
;
});
}
emitForm() {
let validForm = this.form.getRawValue();
this.questions.forEach((q) => {
if (q.type && q.type === 'number') {
if (validForm[q.key])
validForm[q.key] = Number(validForm[q.key]);
}
});
this.formResult.emit(validForm);
}
prepareConditionalControls() {
this.changeSubscriptions = [];
// Listen for changes on other controlls
this.questions.forEach(q => {
if (q.conditional) {
// Subscribe to changes
const targetControl = this.form.controls[q.conditional.controlKey];
this.changeSubscriptions.push(targetControl.valueChanges.subscribe(value => {
if (Array.isArray(value)) {
value.includes(q.conditional.value) ? q.show = true : q.show = false;
}
else {
q.conditional.value === value ? q.show = true : q.show = false;
}
}));
// If values are set check them now
if (Array.isArray(targetControl.value)) {
targetControl.value.includes(q.conditional.value) ? q.show = true : q.show = false;
}
else if (targetControl.value && targetControl.value === q.conditional.value) {
q.show = true;
}
}
});
}
prepareFilteredOptions() {
this.filterSubscriptions = [];
this.questions.forEach((q) => {
if (q.selectionFilter) {
const targetControl = this.form.controls[q.selectionFilter.controlKey];
// If the target value changes, subscribe to load new selections
this.filterSubscriptions.push(targetControl.valueChanges.subscribe(value => {
q.selectionFilter.options$(value).subscribe(res => {
q.options$.next(res);
});
}));
// if target is set, then load them immediately
if (targetControl.value) {
q.selectionFilter.options$(targetControl.value).subscribe(res => {
q.options$.next(res);
});
}
}
});
}
ngOnDestroy() {
if (this.changeSubscriptions) {
this.changeSubscriptions.forEach(s => {
s.unsubscribe;
});
}
if (this.filterSubscriptions) {
this.filterSubscriptions.forEach(s => {
s.unsubscribe;
});
}
}
}
DynamicFormComponent.decorators = [
{ type: Component, args: [{
selector: 'ngx-mat-dynamic-form',
template: "<form [formGroup]=\"form\" fxLayout=\"column\">\n <div fxLayout=\"row wrap\" fxLayoutAlign=\"start center\">\n <div *ngFor=\"let question of questions; let i = index\" [fxFlex.xs]=\"question.xsFlex\"\n [fxFlex.gt-xs]=\"question.flex\">\n <ngx-mat-dynamic-form-question *ngIf=\"question.show\" [question]=\"question\" [form]=\"form\">\n </ngx-mat-dynamic-form-question>\n </div>\n <ng-content></ng-content>\n </div>\n</form>",
providers: [QuestionControlService],
styles: [""]
},] }
];
DynamicFormComponent.ctorParameters = () => [
{ type: QuestionControlService }
];
DynamicFormComponent.propDecorators = {
questions: [{ type: Input }],
buttonText: [{ type: Input }],
emitOnlyOnChange: [{ type: Input }],
formResult: [{ type: Output }]
};
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{ Component, OnInit, Input, Output, EventEmitter, OnDestroy, ContentChildren, TemplateRef, QueryList } from '@angular/core';\r\nimport { QuestionBase } from '../helper-classes/question-base';\r\nimport { FormGroup } from '@angular/forms';\r\nimport { QuestionControlService } from '../services/question-control.service';\r\nimport { Subscription } from 'rxjs';\r\nimport { SelectQuestion } from '../helper-classes/question-select';\r\nimport { TextboxQuestion } from '../helper-classes/question-textbox';\r\n\r\n@Component({\r\n  selector: 'ngx-mat-dynamic-form',\r\n  templateUrl: './dynamic-form.component.html',\r\n  styleUrls: ['./dynamic-form.component.css'],\r\n  providers: [QuestionControlService]\r\n})\r\nexport class DynamicFormComponent implements OnInit, OnDestroy {\r\n\r\n  @Input() questions: QuestionBase<any>[] = [];\r\n  @Input() buttonText: string;\r\n  @Input() emitOnlyOnChange: boolean = false;\r\n  @Output() formResult: EventEmitter<any> = new EventEmitter<any>();\r\n\r\n  form: FormGroup;\r\n\r\n  _buttonText: string;\r\n\r\n  changeSubscriptions: Subscription[];\r\n  filterSubscriptions: Subscription[];\r\n\r\n  constructor(private qcs: QuestionControlService) { }\r\n\r\n  ngOnInit() {\r\n    if (!this.questions || this.questions.length === 0) {\r\n      console.error('Questions are null or empty.')\r\n      return;\r\n    }\r\n    this.form = this.qcs.toFormGroup(this.questions);\r\n    // Emit if the form is valid from begining but not if on change flag is set.\r\n    if (!this.emitOnlyOnChange && this.form.valid) {\r\n      this.emitForm();\r\n    }\r\n    this._buttonText = this.buttonText || 'Save';\r\n\r\n    this.prepareConditionalControls();\r\n\r\n    this.prepareFilteredOptions();\r\n\r\n    this.form.statusChanges.subscribe(status => {\r\n      if (status === 'VALID') {\r\n        this.emitForm();\r\n      } else {\r\n        this.formResult.emit(null)\r\n      };\r\n    })\r\n\r\n  }\r\n\r\n  private emitForm(): void {\r\n    let validForm = this.form.getRawValue();\r\n    this.questions.forEach((q: TextboxQuestion<any>) => {\r\n      if (q.type && q.type === 'number') {\r\n        if (validForm[q.key])\r\n          validForm[q.key] = Number(validForm[q.key]);\r\n      }\r\n    })\r\n    this.formResult.emit(validForm)\r\n  }\r\n\r\n  prepareConditionalControls(): void {\r\n    this.changeSubscriptions = [];\r\n    // Listen for changes on other controlls\r\n    this.questions.forEach(q => {\r\n      if (q.conditional) {\r\n        // Subscribe to changes\r\n        const targetControl = this.form.controls[q.conditional.controlKey];\r\n        this.changeSubscriptions.push(targetControl.valueChanges.subscribe(value => {\r\n          if (Array.isArray(value)) {\r\n            value.includes(q.conditional.value) ? q.show = true : q.show = false;\r\n          } else {\r\n            q.conditional.value === value ? q.show = true : q.show = false;\r\n          }\r\n        }));\r\n        // If values are set check them now\r\n        if (Array.isArray(targetControl.value)) {\r\n          targetControl.value.includes(q.conditional.value) ? q.show = true : q.show = false;\r\n        } else if (targetControl.value && targetControl.value === q.conditional.value) {\r\n          q.show = true;\r\n        }\r\n      }\r\n    });\r\n  }\r\n\r\n  prepareFilteredOptions(): void {\r\n    this.filterSubscriptions = [];\r\n    this.questions.forEach((q: SelectQuestion<any>) => {\r\n      if (q.selectionFilter) {\r\n        const targetControl = this.form.controls[q.selectionFilter.controlKey];\r\n        // If the target value changes, subscribe to load new selections\r\n        this.filterSubscriptions.push(targetControl.valueChanges.subscribe(value => {\r\n          q.selectionFilter.options$(value).subscribe(res => {\r\n            q.options$.next(res)\r\n          })\r\n        }));\r\n        // if target is set, then load them immediately\r\n        if (targetControl.value) {\r\n          q.selectionFilter.options$(targetControl.value).subscribe(res => {\r\n            q.options$.next(res)\r\n          })\r\n        }\r\n      }\r\n    });\r\n  }\r\n\r\n  ngOnDestroy(): void {\r\n    if (this.changeSubscriptions) {\r\n      this.changeSubscriptions.forEach(s => {\r\n        s.unsubscribe;\r\n      })\r\n    }\r\n    if (this.filterSubscriptions) {\r\n      this.filterSubscriptions.forEach(s => {\r\n        s.unsubscribe;\r\n      })\r\n    }\r\n  }\r\n}\r\n"]}