forms - Cannot pass text argument to validator Angular2 -


i'm trying validate wether username taken backend. had issues calling validator (link here custom validator angular 2) whenever attempt check if username taken errors. here code:

form.component.ts

import { component } '@angular/core'; import { ngform, validators, validatorfn, validationerrors } '@angular/forms'; import { injectable } '@angular/core'; import { http, headers, response, requestoptions } '@angular/http'; import { formbuilder, formgroup, formcontrol, abstractcontrol } '@angular/forms';  import { observable } 'rxjs/observable'; import 'rxjs/add/operator/map';  interface validator<t extends formcontrol> {   (c: t): { [error: string]: }; }  function validateusername() : validationerrors {   return (this.checkuser(this.complexform['username'].value)=='y') ? null : {     validateusername: {       valid: false     }   }; }  @component({   selector: 'form1',   templateurl: './form1.html',   moduleid: module.id, }) export class form1component {    public roles = [     { value: '1', display: '1' },     { value: '2', display: '2' },     { value: '3', display: '3' }   ];    private complexform: formgroup;   constructor(private http: http, fb: formbuilder) {  this.complexform = fb.group({           'username': [null, [             validators.required,             validators.minlength(5),             validators.maxlength(10),           ], [validateusername]],           'password': '',           'group_id': '0',           'firstname': '',           'lastname': '',           'organization': '',           'title': '',           'email': '',           'phone': '',         })       }      public checkuser(username: string) {         let url = '/check user url/' + username;         let usernameavailable;         let headers = new headers();         headers.append('user', sessionstorage.getitem('username'));         headers.append('token', sessionstorage.getitem('token'));         headers.append('accesstime', sessionstorage.getitem('accesstime'));          let options = new requestoptions({ headers: headers });          this.http.get(url, options)             .subscribe((res: response) => {               usernameavailable = res.json()}             );             console.log(usernameavailable);             return usernameavailable;     }  }

html component username

    <div class="form-group" [ngclass]="{'has-error':!complexform.controls['username'].valid}">       <label>username</label>       <input class="form-control" id="username" type="text" [validator] <--  // custom validator="complexform.controls['username']" [formcontrol]="complexform.controls['username']">     <div *ngif="complexform.controls['username'].haserror('required') && complexform.controls['username'].touched" class="alert alert-danger">you must include username.</div>     <div *ngif="complexform.controls['username'].haserror('minlength') && complexform.controls['username'].touched" class="alert alert-danger">your username must @ least 5 characters long.</div>     <div *ngif="complexform.controls['username'].haserror('maxlength') && complexform.controls['username'].touched" class="alert alert-danger">your username cannot exceed 10 characters.</div>     </div>

my custom validator failing pass textfield arguement function check if username taken or not.

this error i'm getting whenever start typing textfield:

error typeerror: cannot read property 'checkuser' of undefined     @ validateusername (form1.component.ts:15)     @ forms.es5.js:437     @ array.map (<anonymous>)     @ _executeasyncvalidators (forms.es5.js:437)     @ forms.es5.js:399     @ forms.es5.js:437     @ array.map (<anonymous>)     @ _executeasyncvalidators (forms.es5.js:437)     @ formcontrol.asyncvalidator (forms.es5.js:399)     @ formcontrol.abstractcontrol._runasyncvalidator (forms.es5.js:2632)     @ formcontrol.abstractcontrol.updatevalueandvalidity (forms.es5.js:2593)     @ formcontrol.setvalue (forms.es5.js:2950)     @ defaultvalueaccessor.onchange (forms.es5.js:1753)     @ defaultvalueaccessor._handleinput (forms.es5.js:621)     @ object.eval [as handleevent] (form1component.html:7)

i can provide more details if needed.

thank you!


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