Javascript 链接在NgOnInit和NgAfterViewInit上执行的任务
伙计们，我真的要发疯了，要正确地处理弯钩。我不知道我错在哪里了。我已经试着阅读了很多东西，从现在开始的一周左右，我一直在努力阅读 我的问题 我在NgOnInIt（）期间应用了很多服务器api调用和一些业务逻辑。但这样做时，我有时会遇到Javascript 链接在NgOnInit和NgAfterViewInit上执行的任务,javascript,angular,typescript,angular8,Javascript,Angular,Typescript,Angular8,伙计们，我真的要发疯了，要正确地处理弯钩。我不知道我错在哪里了。我已经试着阅读了很多东西，从现在开始的一周左右，我一直在努力阅读 我的问题 我在NgOnInIt（）期间应用了很多服务器api调用和一些业务逻辑。但这样做时，我有时会遇到RegisterationComponent.html:82错误类型错误：无法读取未定义的的属性“titleId”。在其他时候，我很难正确初始化向导 我现在将详细说明我面临的是什么： 恩戈尼尼特（） ngAfterViewInit（） 现在，必须在ngAfterVi
RegisterationComponent.html:82错误类型错误：无法读取未定义的this.wizard = new KTWizard(this.el.nativeElement, {
startStep: 2
});
this.initializeWizardEvents();
this.setOrderDetails（）RegisterationComponent.html88variable.titleId@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class YourComponentName {
variable;
}
问题是，当您的组件被加载时，变量是未定义的，因此您应该像空对象一样定义
变量：键入={}未定义的并插入一个错误，如果您的组件正在检查一些不同的未定义的
，您应该像变量={titleId:expectedValue}
一样定义变量，该变量已经定义为用户详细信息：用户其中有一个属性，名为titleId
，在组件完成调用和获取用户详细信息之前不会设置该属性。我遇到的问题是，文本框没有通过此错误。我将用引起问题的RegistrationComponent.html
代码块更新问题。你们可以看到它有文本输入和下拉列表。无论出于何种原因，只有在出现此错误时才会出现下拉列表。是否初始化userDetails:User
asuserDetails:User={}？，为什么您要standalone
一些输入和选择不存在？我也会将standalone添加到选择中，但我认为它不会修复，我曾经做过这样的操作。我想。我会让你知道的。至于初始化。它是按照上面提到的方式完成的，而不是通过空对象。
this.wizard = new KTWizard(this.el.nativeElement, {
startStep: 2
});
this.initializeWizardEvents();
<!--begin: Form Wizard Step 2-->
<div class="kt-wizard-v3__content" data-ktwizard-type="step-content" data-ktwizard-state="current">
<div class="kt-form__section kt-form__section--first">
<!-- <ng-template #loggedIn> -->
<div class="kt-wizard-v3__form">
<div class="wizard-title-area">
<p class="para">
<span class="name">Hi {{ userDetails.firstName }}, </span>You have logged in using your social
account. <a href="#">Click here</a> if this is not the correct information.
</p>
</div>
<div class="kt-separator kt-separator--border-2x separator-margin-top-0"></div>
<form #userForm="ngForm">
<div class="form-input-wrap">
<div class="row">
<div class="col-sm-2">
<div class="form-group">
<mat-form-field>
<mat-select
id="prefix"
name="prefix"
placeholder="prefix"
[(ngModel)]="userDetails.titleId"
name="userTitle"
id="userTitle"
required
>
<mat-option *ngFor="let title of titles" [value]="title.id">{{
title.description
}}</mat-option>
</mat-select>
</mat-form-field>
<!-- <div
*ngIf="userTitle.invalid && (userTitle.dirty || userTitle.touched)"
class="alert alert-danger"
>
<div *ngIf="userTitle.errors.required">
Please select a Title
</div>
</div> -->
</div>
</div>
<div class="col-sm-4">
<div class="form-group">
<mat-form-field>
<input
matInput
#input
maxlength="20"
placeholder="First Name"
required
[(ngModel)]="userDetails.firstName"
[ngModelOptions]="{ standalone: true }"
/>
</mat-form-field>
</div>
</div>
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<input
matInput
#input
maxlength="20"
placeholder="Last Name"
required
[(ngModel)]="userDetails.lastName"
[ngModelOptions]="{ standalone: true }"
/>
</mat-form-field>
</div>
</div>
</div>
</div>
<div class="form-input-wrap">
<div class="row">
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<input
matInput
type="email"
#input
maxlength="20"
placeholder="email"
required
[(ngModel)]="userDetails.email"
[ngModelOptions]="{ standalone: true }"
/>
</mat-form-field>
</div>
</div>
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<mat-select
id="gender"
name="gender"
placeholder="gender"
[(ngModel)]="userDetails.genderId"
aria-required="true"
[ngModelOptions]="{ standalone: true }"
>
<mat-option *ngFor="let gender of genders" [value]="gender.id">{{
gender.alias
}}</mat-option>
</mat-select>
</mat-form-field>
</div>
</div>
</div>
</div>
<div class="form-input-wrap">
<div class="row">
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<mat-label>Select your nationality</mat-label>
<mat-select
placeholder="nationality"
[(ngModel)]="userDetails.nationalityCode"
[ngModelOptions]="{ standalone: true }"
>
<mat-option *ngFor="let country of countries" [value]="country.code">{{
country.name
}}</mat-option>
</mat-select>
</mat-form-field>
</div>
</div>
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<mat-label>Select the country of residence</mat-label>
<mat-select
placeholder="country"
[(ngModel)]="userDetails.countryCode"
[ngModelOptions]="{ standalone: true }"
(selectionChange)="onCountryChange()"
>
<mat-option *ngFor="let country of countries" [value]="country.code">{{
country.name
}}</mat-option>
</mat-select>
</mat-form-field>
</div>
</div>
</div>
</div>
<div class="form-input-wrap">
<div class="row">
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<mat-label>Select a job function</mat-label>
<mat-select
matInput
id="userJobFunction"
name="userJobFunction"
placeholder="job function"
[(ngModel)]="userDetails.jobFunctionId"
required
#userJobFunction="ngModel"
>
<mat-option *ngFor="let function of jobFunctions" [value]="function.id">{{
function.name
}}</mat-option>
</mat-select>
<mat-error *ngIf="userJobFunction.hasError('required')">
Please select a job function.
</mat-error>
</mat-form-field>
</div>
</div>
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<mat-label>Select a job title</mat-label>
<mat-select
matInput
id="userJobTitle"
name="userJobTitle"
placeholder="job title"
[(ngModel)]="userDetails.jobTitleId"
required
#userJobTitle="ngModel"
>
<mat-option *ngFor="let jobTitle of jobTitles" [value]="jobTitle.id">{{
jobTitle.name
}}</mat-option>
</mat-select>
<mat-error *ngIf="userJobTitle.hasError('required')">
Please select a job title.
</mat-error>
</mat-form-field>
</div>
</div>
</div>
</div>
<div class="form-input-wrap">
<div class="row">
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<input
matInput
type="text"
#input
maxlength="20"
placeholder="phone"
required
[(ngModel)]="userDetails.mobile"
[ngModelOptions]="{ standalone: true }"
/>
</mat-form-field>
</div>
</div>
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<mat-label>Select a city</mat-label>
<mat-select
matInput
id="userCity"
name="userCity"
placeholder="city"
[(ngModel)]="userDetails.city"
required
#userCity="ngModel"
>
<mat-option *ngFor="let city of filteredCities" [value]="city.id">
{{ city.name }}
</mat-option>
</mat-select>
<mat-error *ngIf="userCity.hasError('required')">
Please select a city.
</mat-error>
</mat-form-field>
</div>
</div>
</div>
</div>
<div class="form-input-wrap">
<div class="row">
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<input matInput [matDatepicker]="userDOB" [max]="maxDate" id="userDOB" name="userDOB" placeholder="Date of Birth" [(ngModel)]="userDetails.userDOB"
[ngModelOptions]="{ standalone: true }">
<mat-datepicker-toggle matSuffix [for]="userDOB"></mat-datepicker-toggle>
<mat-datepicker #userDOB disabled="false"></mat-datepicker>
</mat-form-field>
</div>
</div>
<div class="col-sm-6">
<div class="form-group">
<mat-form-field>
<input
matInput
type="text"
#input
maxlength="20"
placeholder="company"
[(ngModel)]="registrationTransactionDetails.companyName"
[ngModelOptions]="{ standalone: true }"
/>
</mat-form-field>
</div>
</div>
</div>
</div>
</form>
</div>
<!-- </ng-template> -->
</div>
</div>
<!--end: Form Wizard Step 2-->
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class YourComponentName {
variable;
}