ngx-trim-directive
Version:
This directive helps to trim whitespaces of an input text value.
135 lines • 16.8 kB
JavaScript
import { Directive, HostListener, Input, Optional } from '@angular/core';
import * as i0 from "@angular/core";
import * as i1 from "@angular/forms";
export class NgxTrimDirective {
set trim(trimOption) {
if (trimOption !== '' && trimOption !== 'blur' && trimOption !== false) {
console.warn(`Note: The value ${JSON.stringify(trimOption)} is not assignable to the trim attribute.
Only blank string (""), "blur" or false is allowed.`);
this._trim = false;
return;
}
this._trim = trimOption;
setTimeout(// fix the `Expression has changed after it was checked` error
() => {
const elem = this.elementRef.nativeElement;
const eleValue = elem.value;
if (trimOption !== false && eleValue !== eleValue.trim()) {
// initially trim the value if needed
NgxTrimDirective.dispatchEvent(elem, 'blur');
}
});
}
get trim() {
return this._trim;
}
constructor(elementRef, ngControl) {
this.elementRef = elementRef;
this.ngControl = ngControl;
this._trim = '';
this.trimOnWriteValue = true;
this._valueAccessor = null;
this._writeValue = null;
}
static getCaret(el) {
return {
start: el.selectionStart,
end: el.selectionEnd,
};
}
static setCaret(el, start, end) {
el.selectionStart = start;
el.selectionEnd = end;
el.focus();
}
static dispatchEvent(el, eventType) {
const event = new Event(eventType);
el.dispatchEvent(event);
}
static TrimOption(el, value) {
el.value = value.trim();
NgxTrimDirective.dispatchEvent(el, 'input');
}
ngOnInit() {
if (!this.ngControl) {
console.warn('Note: The trim directive should be used with one of ngModel, formControl or formControlName directives.');
return;
}
this._valueAccessor = this.ngControl.valueAccessor;
if (this._valueAccessor) {
this._writeValue = this._valueAccessor.writeValue;
this._valueAccessor.writeValue = (value) => {
const _value = this.trim === false || !value || 'function' !== typeof value.trim || !this.trimOnWriteValue
? value
: value.trim();
if (this._writeValue) {
this._writeValue.call(this._valueAccessor, _value);
}
if (value !== _value) {
if (this._valueAccessor['onChange']) {
this._valueAccessor['onChange'](_value);
}
if (this._valueAccessor['onTouched']) {
this._valueAccessor['onTouched']();
}
}
};
}
}
ngOnDestroy() {
if (this._valueAccessor && this._writeValue) {
this._valueAccessor.writeValue = this._writeValue;
}
}
onBlur(el, value) {
if (this.trim === false) {
return;
}
if ((this.trim === '' || 'blur' === this.trim) && 'function' === typeof value.trim && value.trim() !== value) {
NgxTrimDirective.TrimOption(el, value);
NgxTrimDirective.dispatchEvent(el, 'blur'); // in case updateOn is set to blur
}
}
onInput(el, value) {
if (this.trim === false) {
return;
}
if (this.trim === '' && 'function' === typeof value.trim && value.trim() !== value) {
let { start, end } = NgxTrimDirective.getCaret(el);
if (value[0] === ' ' && start === 1 && end === 1) {
start = 0;
end = 0;
}
NgxTrimDirective.TrimOption(el, value);
NgxTrimDirective.setCaret(el, start, end);
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.2", ngImport: i0, type: NgxTrimDirective, deps: [{ token: i0.ElementRef }, { token: i1.NgControl, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.2", type: NgxTrimDirective, selector: "input[trim],textarea[trim]", inputs: { trim: "trim", trimOnWriteValue: "trimOnWriteValue" }, host: { listeners: { "blur": "onBlur($event.target,$event.target.value)", "input": "onInput($event.target,$event.target.value)" } }, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.2", ngImport: i0, type: NgxTrimDirective, decorators: [{
type: Directive,
args: [{
selector: 'input[trim],textarea[trim]',
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i1.NgControl, decorators: [{
type: Optional
}] }]; }, propDecorators: { trim: [{
type: Input,
args: ['trim']
}], trimOnWriteValue: [{
type: Input
}], onBlur: [{
type: HostListener,
args: ['blur', [
'$event.target',
'$event.target.value',
]]
}], onInput: [{
type: HostListener,
args: ['input', [
'$event.target',
'$event.target.value',
]]
}] } });
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{ Directive, ElementRef, HostListener, Input, OnDestroy, OnInit, Optional } from '@angular/core';\nimport { ControlValueAccessor, NgControl } from '@angular/forms';\n\n@Directive({\n  selector: 'input[trim],textarea[trim]',\n})\nexport class NgxTrimDirective implements OnInit, OnDestroy {\n\n  private _trim: TrimOption = '';\n  @Input('trim')\n  public set trim(trimOption: TrimOption) {\n    if (trimOption !== '' && trimOption !== 'blur' && trimOption !== false) {\n      console.warn(`Note: The value ${JSON.stringify(trimOption)} is not assignable to the trim attribute.\n        Only blank string (\"\"), \"blur\" or false is allowed.`);\n\n      this._trim = false;\n      return;\n    }\n\n    this._trim = trimOption;\n\n    setTimeout( // fix the `Expression has changed after it was checked` error\n\n      () => {\n\n        const elem = this.elementRef.nativeElement;\n\n        const eleValue = elem.value;\n\n        if (trimOption !== false && eleValue !== eleValue.trim()) {\n\n          // initially trim the value if needed\n          NgxTrimDirective.dispatchEvent(elem, 'blur');\n        }\n\n      },\n\n    );\n  }\n\n  public get trim() {\n    return this._trim;\n  }\n\n  @Input() trimOnWriteValue = true;\n\n  private _valueAccessor: ControlValueAccessor | null = null;\n  private _writeValue: ((value: any) => void) | null = null;\n\n  constructor(\n    private elementRef: ElementRef,\n    @Optional() private ngControl: NgControl,\n  ) {\n  }\n\n  private static getCaret(el: TrimElement) {\n\n    return {\n      start: el.selectionStart,\n      end: el.selectionEnd,\n    };\n\n  }\n\n  private static setCaret(el: TrimElement, start: number | null, end: number | null) {\n\n    el.selectionStart = start;\n    el.selectionEnd = end;\n\n    el.focus();\n\n  }\n\n  private static dispatchEvent(el: TrimElement, eventType: string) {\n\n    const event = new Event(eventType);\n    el.dispatchEvent(event);\n\n  }\n\n  private static TrimOption(el: TrimElement, value: string) {\n\n    el.value = value.trim();\n\n    NgxTrimDirective.dispatchEvent(el, 'input');\n\n  }\n\n  ngOnInit(): void {\n\n    if (!this.ngControl) {\n\n      console.warn(\n        'Note: The trim directive should be used with one of ngModel, formControl or formControlName directives.');\n\n      return;\n\n    }\n\n    this._valueAccessor = this.ngControl.valueAccessor;\n\n    if (this._valueAccessor) {\n      this._writeValue = this._valueAccessor.writeValue;\n      this._valueAccessor.writeValue = (value) => {\n        const _value =\n          this.trim === false || !value || 'function' !== typeof value.trim || !this.trimOnWriteValue\n            ? value\n            : value.trim();\n\n        if (this._writeValue) {\n          this._writeValue.call(this._valueAccessor, _value);\n        }\n\n        if (value !== _value) {\n          if ((this._valueAccessor as any)['onChange']) {\n            (this._valueAccessor as any)['onChange'](_value);\n          }\n\n          if ((this._valueAccessor as any)['onTouched']) {\n            (this._valueAccessor as any)['onTouched']();\n          }\n        }\n\n      };\n    }\n\n  }\n\n  ngOnDestroy(): void {\n\n    if (this._valueAccessor && this._writeValue) {\n\n      this._valueAccessor.writeValue = this._writeValue;\n\n    }\n\n  }\n\n  @HostListener('blur', [\n    '$event.target',\n    '$event.target.value',\n  ])\n  onBlur(el: any, value: string): void {\n    if (this.trim === false) {\n\n      return;\n\n    }\n\n    if ((this.trim === '' || 'blur' === this.trim) && 'function' === typeof value.trim && value.trim() !== value) {\n\n      NgxTrimDirective.TrimOption(el, value);\n      NgxTrimDirective.dispatchEvent(el, 'blur'); // in case updateOn is set to blur\n\n    }\n\n  }\n\n  @HostListener('input', [\n    '$event.target',\n    '$event.target.value',\n  ])\n  onInput(el: any, value: string): void {\n\n    if (this.trim === false) {\n\n      return;\n\n    }\n\n    if (this.trim === '' && 'function' === typeof value.trim && value.trim() !== value) {\n\n      let { start, end } = NgxTrimDirective.getCaret(el);\n\n      if (value[0] === ' ' && start === 1 && end === 1) {\n\n        start = 0;\n        end = 0;\n\n      }\n\n      NgxTrimDirective.TrimOption(el, value);\n\n      NgxTrimDirective.setCaret(el, start, end);\n\n    }\n\n  }\n\n}\n\ntype TrimElement = HTMLInputElement | HTMLTextAreaElement;\n\nexport type TrimOption = '' | 'blur' | false;\n"]}