ngx-mat-dynamic-form-builder
Version:
Build dynamic forms in Angular Material using Reactive forms.
149 lines • 21.2 kB
JavaScript
import { COMMA, ENTER } from '@angular/cdk/keycodes';
import { Component, ViewChild, Input, Output, EventEmitter } from '@angular/core';
import { FormControl, Validators } from '@angular/forms';
import { map, startWith } from 'rxjs/operators';
import { isString } from 'lodash';
export class ChipSelectorComponent {
constructor() {
this.options = [];
this.hint = "";
this.appearance = 'standard';
this.disabled = false;
this.customChip = false;
this.output = new EventEmitter();
this.visible = true;
this.selectable = true;
this.separatorKeysCodes = [ENTER, COMMA];
this.selectedObjects = [];
}
ngOnInit() {
this.setupValidators();
}
ngOnChanges(changes) {
if (changes.options && this.options) {
if (!this.formControl)
this.setupValidators();
this.filteredObjects = this.formControl.valueChanges.pipe(startWith([]), map((obj) => {
return obj ? this._filter(obj) : this.options.slice();
}));
if (this.defaultOptions && this.defaultOptionsKey) {
this.addDefaultSelected(this.defaultOptions);
}
}
}
setupValidators() {
if (this.formControl)
return;
if (this.validators) {
let isRequired = false;
this.validators.forEach(vd => {
if (vd.name === 'required')
isRequired = true;
});
if (isRequired) {
this.formControl = new FormControl(this.selectedObjects, [Validators.required, this.valueSelected()]);
}
else {
this.formControl = new FormControl(this.selectedObjects, [this.valueSelected()]);
}
}
else if (!this.customChip) {
this.formControl = new FormControl(this.selectedObjects, [this.valueSelected()]);
}
else {
this.formControl = new FormControl();
}
}
add(event) {
// Add fruit only when MatAutocomplete is not open
// To make sure this does not conflict with OptionSelected Event
if (!this.matAutocomplete.isOpen) {
const input = event.input;
const value = event.value;
if (this.customChip && (value || '').trim()) {
this.selectedObjects.push({ [this.displayKey]: value.trim() });
this.output.emit(this.selectedObjects);
}
// Reset the input value
if (input) {
input.value = '';
}
}
this.formControl.setValue(this.selectedObjects);
this.formControl.updateValueAndValidity();
}
remove(item) {
this.updateFilteredObjects();
const index = this.selectedObjects.indexOf(item);
if (index >= 0) {
this.selectedObjects.splice(index, 1);
this.output.emit(this.selectedObjects);
}
this.formControl.updateValueAndValidity();
}
updateFilteredObjects() {
this.filteredObjects = this.filteredObjects.pipe(map(data => data.filter(obj => !this.selectedObjects.includes(obj))));
}
selected(event) {
this.selectedObjects.push(event.option.value);
this.output.emit(this.selectedObjects);
this.updateFilteredObjects();
this.formInput.nativeElement.value = '';
this.formInput.nativeElement.blur();
this.formControl.setValue(this.selectedObjects);
}
addDefaultSelected(values) {
if (!Array.isArray(values)) {
console.error('Default values not an array');
return;
}
this.selectedObjects = this.options.filter(i => values.some(t => t === i[this.defaultOptionsKey]));
this.output.emit(this.selectedObjects);
this.updateFilteredObjects();
this.formControl.setValue(this.selectedObjects);
}
_filter(value) {
if (isString(value) && value.length >= 1) {
let filterValue = value.toLowerCase();
return this.options.filter(obj => obj[this.filterKey ? this.filterKey : this.displayKey].
toLowerCase().includes(filterValue));
}
return this.options;
}
valueSelected() {
return (c) => {
// if value is set and it is not an object, valid option not selected
if (c.value && typeof c.value !== 'object') {
return { match: true };
}
else {
return null;
}
};
}
}
ChipSelectorComponent.decorators = [
{ type: Component, args: [{
selector: 'ngx-mat-chip-selector',
template: "<mat-form-field [appearance]=\"appearance\" fxFlex>\r\n <mat-label>{{label}}</mat-label>\r\n <mat-chip-list #chipList>\r\n <mat-chip *ngFor=\"let obj of selectedObjects\" [selectable]=\"selectable\" [removable]=\"!disabled\"\r\n (removed)=\"remove(obj)\">\r\n {{obj[displayKey]}}\r\n <mat-icon matChipRemove *ngIf=\"!disabled\">cancel</mat-icon>\r\n </mat-chip>\r\n <input [placeholder]=\"placeholder\" [readonly]=\"disabled\" #formInput [matAutocomplete]=\"auto\"\r\n [matChipInputFor]=\"chipList\" [matChipInputSeparatorKeyCodes]=\"separatorKeysCodes\"\r\n (matChipInputTokenEnd)=\"add($event)\" [formControl]=\"formControl\">\r\n <mat-error *ngIf=\"!formControl.valid && formControl.touched\">Select valid option</mat-error>\r\n </mat-chip-list>\r\n <mat-autocomplete #auto=\"matAutocomplete\" (optionSelected)=\"selected($event)\">\r\n <mat-option *ngFor=\"let obj of filteredObjects | async\" [value]=\"obj\">\r\n {{obj[displayKey]}}\r\n </mat-option>\r\n </mat-autocomplete>\r\n <mat-hint>{{hint}} </mat-hint>\r\n</mat-form-field>",
styles: [""]
},] }
];
ChipSelectorComponent.propDecorators = {
options: [{ type: Input }],
defaultOptions: [{ type: Input }],
defaultOptionsKey: [{ type: Input }],
label: [{ type: Input }],
placeholder: [{ type: Input }],
displayKey: [{ type: Input }],
filterKey: [{ type: Input }],
hint: [{ type: Input }],
appearance: [{ type: Input }],
disabled: [{ type: Input }],
customChip: [{ type: Input }],
validators: [{ type: Input }],
output: [{ type: Output }],
formInput: [{ type: ViewChild, args: ['formInput',] }],
matAutocomplete: [{ type: ViewChild, args: ['auto',] }]
};
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{ COMMA, ENTER } from '@angular/cdk/keycodes';\r\nimport { Component, ElementRef, ViewChild, OnInit, Input, Output, EventEmitter, SimpleChanges, OnChanges } from '@angular/core';\r\nimport { FormControl, ValidatorFn, Validators, AbstractControl } from '@angular/forms';\r\nimport { MatAutocompleteSelectedEvent, MatAutocomplete } from '@angular/material/autocomplete';\r\nimport { MatChipInputEvent } from '@angular/material/chips';\r\nimport { Observable } from 'rxjs';\r\nimport { map, startWith } from 'rxjs/operators';\r\nimport { isString } from 'lodash';\r\n\r\n@Component({\r\n  selector: 'ngx-mat-chip-selector',\r\n  templateUrl: './chip-selector.component.html',\r\n  styleUrls: ['./chip-selector.component.css']\r\n})\r\nexport class ChipSelectorComponent implements OnInit, OnChanges {\r\n\r\n  @Input() options: any[] = [];\r\n  // Default selected options (array of selection keys)\r\n  @Input() defaultOptions: any[];\r\n  @Input() defaultOptionsKey: string;\r\n  @Input() label: string;\r\n  @Input() placeholder: string;\r\n  @Input() displayKey: string;\r\n  // If filterKey not specified defaults to displayKey value\r\n  @Input() filterKey: string;\r\n  @Input() hint: string = \"\";\r\n  @Input() appearance: string = 'standard';\r\n  @Input() disabled: boolean = false;\r\n  @Input() customChip: boolean = false;\r\n\r\n  @Input() validators: ValidatorFn[];\r\n\r\n  @Output() output = new EventEmitter<any[]>();\r\n\r\n  formControl: FormControl;\r\n\r\n  @ViewChild('formInput') formInput: ElementRef<HTMLInputElement>;\r\n  @ViewChild('auto') matAutocomplete: MatAutocomplete;\r\n\r\n  visible = true;\r\n  selectable = true;\r\n  separatorKeysCodes: number[] = [ENTER, COMMA];\r\n\r\n  filteredObjects: Observable<any[]>;\r\n  selectedObjects: any[] = [];\r\n\r\n  ngOnInit() {\r\n    this.setupValidators();\r\n  }\r\n\r\n  ngOnChanges(changes: SimpleChanges) {\r\n    if (changes.options && this.options) {\r\n      if (!this.formControl)\r\n        this.setupValidators();\r\n\r\n      this.filteredObjects = this.formControl.valueChanges.pipe(\r\n        startWith([]),\r\n        map((obj: string | null) => {\r\n          return obj ? this._filter(obj) : this.options.slice()\r\n        })\r\n      );\r\n      if (this.defaultOptions && this.defaultOptionsKey) {\r\n        this.addDefaultSelected(this.defaultOptions);\r\n      }\r\n    }\r\n  }\r\n\r\n  setupValidators(): void {\r\n    if (this.formControl)\r\n      return;\r\n    if (this.validators) {\r\n      let isRequired = false;\r\n      this.validators.forEach(vd => {\r\n        if (vd.name === 'required')\r\n          isRequired = true;\r\n      });\r\n      if (isRequired) {\r\n        this.formControl = new FormControl(this.selectedObjects, [Validators.required, this.valueSelected()]);\r\n      } else {\r\n        this.formControl = new FormControl(this.selectedObjects, [this.valueSelected()]);\r\n      }\r\n    } else if (!this.customChip) {\r\n      this.formControl = new FormControl(this.selectedObjects, [this.valueSelected()]);\r\n    } else {\r\n      this.formControl = new FormControl();\r\n    }\r\n  }\r\n\r\n  add(event: MatChipInputEvent): void {\r\n    // Add fruit only when MatAutocomplete is not open\r\n    // To make sure this does not conflict with OptionSelected Event\r\n    if (!this.matAutocomplete.isOpen) {\r\n      const input = event.input;\r\n      const value = event.value;\r\n\r\n      if (this.customChip && (value || '').trim()) {\r\n        this.selectedObjects.push({ [this.displayKey]: value.trim() });\r\n        this.output.emit(this.selectedObjects);\r\n      }\r\n\r\n      // Reset the input value\r\n      if (input) {\r\n        input.value = '';\r\n      }\r\n    }\r\n    this.formControl.setValue(this.selectedObjects);\r\n    this.formControl.updateValueAndValidity();\r\n  }\r\n\r\n  remove(item: string): void {\r\n    this.updateFilteredObjects();\r\n\r\n    const index = this.selectedObjects.indexOf(item);\r\n\r\n    if (index >= 0) {\r\n      this.selectedObjects.splice(index, 1);\r\n      this.output.emit(this.selectedObjects);\r\n    }\r\n    this.formControl.updateValueAndValidity();\r\n\r\n  }\r\n\r\n  updateFilteredObjects() {\r\n    this.filteredObjects = this.filteredObjects.pipe(\r\n      map(data =>\r\n        data.filter(obj => !this.selectedObjects.includes(obj))\r\n      )\r\n    )\r\n  }\r\n\r\n  selected(event: MatAutocompleteSelectedEvent): void {\r\n    this.selectedObjects.push(event.option.value);\r\n    this.output.emit(this.selectedObjects);\r\n\r\n    this.updateFilteredObjects();\r\n    this.formInput.nativeElement.value = '';\r\n    this.formInput.nativeElement.blur();\r\n    this.formControl.setValue(this.selectedObjects);\r\n  }\r\n\r\n  addDefaultSelected(values: any[]): void {\r\n    if (!Array.isArray(values)) {\r\n      console.error('Default values not an array');\r\n      return;\r\n    }\r\n    this.selectedObjects = this.options.filter(i => values.some(t => t === i[this.defaultOptionsKey]));\r\n    this.output.emit(this.selectedObjects);\r\n    this.updateFilteredObjects();\r\n    this.formControl.setValue(this.selectedObjects);\r\n  }\r\n\r\n  private _filter(value: string): string[] {\r\n    if (isString(value) && value.length >= 1) {\r\n      let filterValue = value.toLowerCase();\r\n\r\n      return this.options.filter(obj => obj[this.filterKey ? this.filterKey : this.displayKey].\r\n        toLowerCase().includes(filterValue));\r\n    }\r\n    return this.options;\r\n  }\r\n\r\n  private valueSelected(): ValidatorFn {\r\n    return (c: AbstractControl): { [key: string]: boolean } | null => {\r\n      // if value is set and it is not an object, valid option not selected\r\n      if (c.value && typeof c.value !== 'object') {\r\n        return { match: true };\r\n      } else {\r\n        return null;\r\n      }\r\n    };\r\n  }\r\n}\r\n"]}