ngx-file-required
Version:
Angular input file required directive
189 lines (188 loc) • 14.7 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
import { Directive, ElementRef, Input, HostListener } from '@angular/core';
import { NG_VALIDATORS } from '@angular/forms';
/** @typedef {?} */
var HTMLFileInputAttribute;
export { HTMLFileInputAttribute };
/**
* @record
*/
function FileInputEventTarget() { }
/** @type {?} */
FileInputEventTarget.prototype.files;
export class NgxFileRequiredDirective {
/**
* @param {?} element
*/
constructor(element) {
this.requiredErrorMsg = 'File is required';
this._required = false;
this._multiple = false;
this._element = element;
}
/**
* @return {?}
*/
get required() {
return this._required || this._element.nativeElement.hasAttribute('required');
}
/**
* @param {?} value
* @return {?}
*/
set required(value) {
this._required = value || this._element.nativeElement.hasAttribute('required');
}
/**
* @return {?}
*/
get multiple() {
return this._element.nativeElement.hasAttribute('multiple');
}
/**
* @param {?} value
* @return {?}
*/
set multiple(value) {
this._multiple = value === '' || !!value;
}
/**
* @return {?}
*/
ngOnInit() {
this._mutationObserver = new MutationObserver((mutations) => {
this._setValidity(this._getInputValue(/** @type {?} */ (this._element.nativeElement)));
});
this._mutationObserver.observe(this._element.nativeElement, {
attributes: true,
attributeOldValue: true,
attributeFilter: ['required']
});
}
/**
* @return {?}
*/
ngOnDestroy() {
this._mutationObserver.disconnect();
}
/**
* @param {?} changes
* @return {?}
*/
ngOnChanges(changes) {
if (this.required &&
(changes["requiredErrorMsg"] && !changes["requiredErrorMsg"].firstChange)) {
this._setValidity(this._getInputValue(/** @type {?} */ (this._element.nativeElement)));
}
}
/**
* @param {?} control
* @return {?}
*/
validate(control) {
if (!this._control) {
this._control = control;
}
if (this._hasError(this._control.value)) {
return /** @type {?} */ ({
required: this.requiredErrorMsg
});
}
}
/**
* @param {?} eventTarget
* @return {?}
*/
onChange(eventTarget) {
/** @type {?} */
const value = this._getInputValue(/** @type {?} */ (eventTarget));
this._setValidity(value);
}
/**
* @param {?} value
* @return {?}
*/
_setValidity(value) {
/** @type {?} */
const errors = Object.assign({}, this._control.errors);
if (this._hasError(value)) {
errors["required"] = this.requiredErrorMsg;
}
else {
if (this._control.hasError('required')) {
delete errors["required"];
}
}
this._control.setErrors(Object.keys(errors).length ? errors : null);
}
/**
* @param {?} value
* @return {?}
*/
_hasError(value) {
return this.required && !this._hasValue(value);
}
/**
* @param {?} value
* @return {?}
*/
_hasValue(value) {
return this.multiple ?
value instanceof FileList && !!value.length :
value instanceof File;
}
/**
* @param {?} eventTarget
* @return {?}
*/
_getInputValue(eventTarget) {
return this.multiple ? eventTarget.files : eventTarget.files.item(0);
}
}
NgxFileRequiredDirective.decorators = [
{ type: Directive, args: [{
selector: `
input[type="file"][attr.required][formControlName],
input[type="file"][attr.required][formControl],
input[type="file"][attr.required][ngModel],
input[type="file"][required][formControlName],
input[type="file"][required][formControl],
input[type="file"][required][ngModel]
`,
exportAs: 'ngxFileRequiredDirective',
providers: [
{
provide: NG_VALIDATORS,
useExisting: NgxFileRequiredDirective,
multi: true
}
]
},] },
];
/** @nocollapse */
NgxFileRequiredDirective.ctorParameters = () => [
{ type: ElementRef }
];
NgxFileRequiredDirective.propDecorators = {
requiredErrorMsg: [{ type: Input }],
multiple: [{ type: Input }],
onChange: [{ type: HostListener, args: ['change', ['$event.target'],] }]
};
if (false) {
/** @type {?} */
NgxFileRequiredDirective.prototype.requiredErrorMsg;
/** @type {?} */
NgxFileRequiredDirective.prototype._required;
/** @type {?} */
NgxFileRequiredDirective.prototype._multiple;
/** @type {?} */
NgxFileRequiredDirective.prototype._element;
/** @type {?} */
NgxFileRequiredDirective.prototype._control;
/** @type {?} */
NgxFileRequiredDirective.prototype._mutationObserver;
}
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{\n  OnInit,\n  OnDestroy,\n  OnChanges,\n  SimpleChanges,\n  Directive,\n  ElementRef,\n  Input,\n  HostListener\n} from '@angular/core';\nimport {\n  NG_VALIDATORS,\n  Validator,\n  AbstractControl,\n  ValidationErrors\n} from '@angular/forms';\n\nexport type HTMLFileInputAttribute = any | boolean;\ninterface FileInputEventTarget extends EventTarget {\n  files: FileList;\n}\n\n@Directive({\n  selector: `\n    input[type=\"file\"][attr.required][formControlName],\n    input[type=\"file\"][attr.required][formControl],\n    input[type=\"file\"][attr.required][ngModel],\n    input[type=\"file\"][required][formControlName],\n    input[type=\"file\"][required][formControl],\n    input[type=\"file\"][required][ngModel]\n  `,\n  exportAs:  'ngxFileRequiredDirective',\n  providers: [\n    {\n      provide:     NG_VALIDATORS,\n      useExisting: NgxFileRequiredDirective,\n      multi:       true\n    }\n  ]\n})\nexport class NgxFileRequiredDirective implements Validator, OnInit, OnDestroy, OnChanges {\n\n  public get required(): HTMLFileInputAttribute {\n    return this._required || this._element.nativeElement.hasAttribute('required');\n  }\n\n  public set required(value: HTMLFileInputAttribute) {\n    this._required = value || this._element.nativeElement.hasAttribute('required');\n  }\n\n  @Input()\n  public requiredErrorMsg = 'File is required';\n\n  @Input()\n  public get multiple(): HTMLFileInputAttribute {\n    return this._element.nativeElement.hasAttribute('multiple');\n  }\n\n  public set multiple(value: HTMLFileInputAttribute) {\n    this._multiple = value === '' || !!value;\n  }\n\n  private _required = false;\n\n  private _multiple = false;\n\n  private _element: ElementRef;\n\n  private _control: AbstractControl;\n\n  private _mutationObserver: MutationObserver;\n\n  public constructor(element: ElementRef) {\n    this._element = element;\n  }\n\n  public ngOnInit(): void {\n    this._mutationObserver = new MutationObserver((mutations: MutationRecord[]): void => {\n      this._setValidity(this._getInputValue(this._element.nativeElement as FileInputEventTarget));\n    });\n\n    this._mutationObserver.observe(this._element.nativeElement, {\n      attributes: true,\n      attributeOldValue: true,\n      attributeFilter: ['required']\n    });\n  }\n\n  public ngOnDestroy(): void {\n    this._mutationObserver.disconnect();\n  }\n\n  public ngOnChanges(changes: SimpleChanges): void {\n    if (\n      this.required &&\n      (changes.requiredErrorMsg && !changes.requiredErrorMsg.firstChange)\n    ) {\n      this._setValidity(this._getInputValue(this._element.nativeElement as FileInputEventTarget));\n    }\n  }\n\n  public validate(control: AbstractControl): ValidationErrors {\n    if (!this._control) {\n      this._control = control;\n    }\n\n    if (this._hasError(this._control.value)) {\n      return {\n        required: this.requiredErrorMsg\n      } as ValidationErrors;\n    }\n  }\n\n  @HostListener('change', ['$event.target'])\n  public onChange(eventTarget: EventTarget): void {\n    const value: File|FileList|undefined = this._getInputValue(eventTarget as FileInputEventTarget);\n    this._setValidity(value);\n  }\n\n  private _setValidity(value: File|FileList|undefined): void {\n    const errors: ValidationErrors = Object.assign({}, this._control.errors);\n\n    if (this._hasError(value)) {\n      errors.required = this.requiredErrorMsg;\n    } else {\n      if (this._control.hasError('required')) {\n        delete errors.required;\n      }\n    }\n\n    this._control.setErrors(Object.keys(errors).length ? errors : null);\n  }\n\n  private _hasError(value: File|FileList|undefined): boolean {\n    return this.required && !this._hasValue(value);\n  }\n\n  private _hasValue(value: File|FileList|undefined): boolean {\n    return this.multiple ?\n      value instanceof FileList && !!value.length :\n      value instanceof File;\n  }\n\n  private _getInputValue(eventTarget: FileInputEventTarget): File|FileList|undefined {\n    return this.multiple ? eventTarget.files : eventTarget.files.item(0);\n  }\n\n}\n"]}