https://stackoverflow.com/questions/50935728/access-viewchild-from-another-component ================= I have two components, one videoComponent and videoControlsComponent. The video component contains a <video> element and the video component has s…

For example we have a component: <Card ></Card> And a driective: <Card highlighted></Card> We want to get the driective instant inside the component code, we can use @ViewChild: @ViewChild(CardComponennt, {read: HighlightedDirectiv…

*The children element which are located inside of its template of a component are called *view children *. On the other hand, **elements which are used between the opening and closing tags of the host element of a given component are called *content…

https://segmentfault.com/a/1190000008695459 ViewChild ViewChild 是属性装饰器,用来从模板视图中获取匹配的元素.视图查询在 ngAfterViewInit 钩子函数调用前完成,因此在 ngAfterViewInit 钩子函数中,才能正确获取查询的元素. @ViewChild 使用模板变量名 import { Component, ElementRef, ViewChild, AfterViewInit } from '@angular…

Introduction about React component lifecycle. 1 Lifecycle A React component in browser can be any of the following three statuses: mounted, update and unmounted. So React component lifecycle can be divided into three phases according to these statuse…

Signon Event Message Select selectPeopleTools, then selectUtilities, then selectAdministration, then selectSignOn Event Message to access the Event Messages page. Use this page to define messages to display to end users when they sign on to the Peopl…

当我们使用eclipse编写Mybatis或hibernate的xml文件时,面对众多标签的配置文件,却没有自动提醒,对于工作和学习都十分不方便. 之所以没有自动提醒,是因为dtd文件没有加载成功. 默认mybatis的dtd文件会从网络中加载,但是因为是国外的网站,所以一般我们是访问不了的,也就造成了没有自动提醒的现象,但是可以通过手动配置来实现该功能,并且对应的文件就在jar包中.大家可以自己找也可以直接复制下面的dtd文件. mybatis-3-config.dtd文件 <!DOCTYPE…

框架的作用 学过javaWeb基础的已经对web层 jsp  servlet   ,service  层  ,dao层的jdbc .DBUtils 有了很深的了解 并编写代码实现某种功能 为了提高开发效率,使用框架中 已经实现好的功能 开发过程中的一些流程结 我们先学习hibernate框架 第一步导包: (1) hibernate必须的基本jar包 (2) jdbc驱动包 第二部  :书写orm元数据(对象与表的映射配置文件) 1.导入约束:  (保证在eclipse中有配置文件的提示) 保证…

看此篇博客前或者后,看一下trailhead可以加深印象以及理解的更好:https://trailhead.salesforce.com/modules/lex_dev_lc_basics 做过classic的朋友知道,前台和后台交互可以在页面上使用多种方式,比如在VF page中apex:commandButton等标签绑定action,使用actionFunction,使用ajax toolkit,使用VF Remoting或者使用action:support多种方式实现和后台的交互.如果你…

废话少说 直接上代码.... //导入需要用到的命名空间 ViewChild,Content import { Component, ViewChild } from '@angular/core'; import { NavController, ModalController, ToastController, Content } from 'ionic-angular'; @Component({ selector: 'home', templateUrl: 'home.html', })…