checknewpasswordoldpassword(control: AbstractControl): {[s: string]: boolean}{
    //i want get value from html in here
    return { nospace: true};
}

ngOnInit(){
    this.submitButtonText = 'Accept';
    this.form = this.fb.group({
        'id': [],
        'registerkey':[this.id],
        'username': ['', Validators.compose([Validators.required])],
        'newpassword': ['', Validators.compose([Validators.required,this.checknewpasswordoldpassword])],
        'oldpassword': ['', Validators.compose([Validators.required])]
    });
    this.username = this.form.controls['username'];
    this.registerkey = this.form.controls['registerkey'];
    this.newpassword = this.form.controls['newpassword'];
    this.oldpassword = this.form.controls['oldpassword'];
}

<div class="form-group row" [ngClass]="{'has-error': (!oldpassword.valid && oldpassword.touched), 'has-success': (oldpassword.valid && oldpassword.touched)}">
                            <label class="col-sm-2 control-label">Old Password</label>
                            <div class="col-sm-3">
                                <input [formControl]="oldpassword" type="text" class="form-control" placeholder="old password"/>
                            </div>
                        </div>