tb-json-to-string.directive.ts
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///
/// Copyright © 2016-2024 The Thingsboard Authors
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
/// http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
import { Directive, ElementRef, forwardRef, HostListener, Renderer2, SkipSelf } from '@angular/core';
import {
ControlValueAccessor,
FormGroupDirective,
NG_VALIDATORS,
NG_VALUE_ACCESSOR,
NgForm,
UntypedFormControl,
ValidationErrors,
Validator
} from '@angular/forms';
import { ErrorStateMatcher } from '@angular/material/core';
import { isObject } from '@core/utils';
@Directive({
selector: '[tb-json-to-string]',
// eslint-disable-next-line @angular-eslint/no-host-metadata-property
host: {
'(blur)': 'onTouched()'
},
providers: [{
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => TbJsonToStringDirective),
multi: true
},
{
provide: NG_VALIDATORS,
useExisting: forwardRef(() => TbJsonToStringDirective),
multi: true,
},
{
provide: ErrorStateMatcher,
useExisting: TbJsonToStringDirective
}]
})
export class TbJsonToStringDirective implements ControlValueAccessor, Validator, ErrorStateMatcher {
private propagateChange = null;
public onTouched = () => {};
private parseError: boolean;
private data: any;
@HostListener('input', ['$event.target.value']) input(newValue: any): void {
try {
if (newValue) {
this.data = JSON.parse(newValue);
if (isObject(this.data)) {
this.parseError = false;
} else {
this.data = null;
this.parseError = true;
}
} else {
this.data = null;
this.parseError = false;
}
} catch (e) {
this.data = null;
this.parseError = true;
}
this.propagateChange(this.data);
}
constructor(private render: Renderer2,
private element: ElementRef,
@SkipSelf() private errorStateMatcher: ErrorStateMatcher) {
}
isErrorState(control: UntypedFormControl | null, form: FormGroupDirective | NgForm | null): boolean {
return !!(control && control.invalid && !Array.isArray(control.value) && control.touched);
}
validate(c: UntypedFormControl): ValidationErrors {
return (!this.parseError) ? null : {
invalidJSON: {
valid: false
}
};
}
writeValue(obj: any): void {
this.data = obj;
this.parseError = false;
this.render.setProperty(this.element.nativeElement, 'value', obj ? JSON.stringify(obj) : '');
}
registerOnChange(fn: any): void {
this.propagateChange = fn;
}
registerOnTouched(fn: any): void {
this.onTouched = fn;
}
}