Angular lesson 5: Parent component listens for child event
The child component exposes an EventEmitter property with which it emits events when something happens. The parent binds to that event property and reacts to…
Month: May 2018
Angular lesson 4: Intercept input property changes with ngOnChanges()
We can detect and act upon changes to input property values with the ngOnChanges() method of the OnChanges interface. Child component: src/app/child/child.component.html src/app/child/child.component.css src/app/child/child.component.ts Parent…
How to install php-pgsql on CentOS
Step 1: find PHP version Step 2: Step 3: in this case we install php56-php-pgsql Or you can use this repo: http://rpms.famillecollet.com/enterprise/7/test/x86_64//php56-php-pgsql-5.6.30-2.el7.remi.x86_64.rpm Then you will…
How to setup phpPgAdmin on CentOS
Suppose that we have a server with nginx and php-fpm installed. Step 1: Result: Step 2: create PostgreSQL user First login as the postgres user…
How to Install PostgreSQL on CentOS
Step 1: Step 2: Data Directory: /var/lib/pgsql/data Step 3: Step 4: Note: You can install other version e.g: 11 by using this repo: https://download.postgresql.org/pub/repos/yum/testing/11/redhat/rhel-7-x86_64/pgdg-centos11-11-1.noarch.rpm (You…
Angular lesson 3: pass data from parent component to child with input binding
In lesson 2, we learnt about Component. Now, we continue learn about component. Step 1: Create file school.ts in src/app Step 2: edit some files…
Angular lesson 2: Components
In the previous tutorials (Lesson 1), we have seen the default component is app component: There are 5 files: The app component were created by…
Angular lesson 1: Simple example
Requirements: + Node.js + Npm Step 1: Install angular-cli Now you can use angular-cli: Step 2: install typecrypt Step 3: Open Webstorm and create new…
How to capitalize first character of a string in Javascript
Function ucfirst in Javascript Method 1: Example: Try it yourself
How to fix error on CentOS: yum doesn’t have enough cached data to continue
If you see error: How to fix it? Open file /etc/yum.conf then add the line: Example file /etc/yum.conf