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Why creating this site? Mostly for myself because I forget stuff all the time, and computer science is just too much stuff need to be remembered. I think it would be good to have a place to write down some notes in case I need to do something again and forgot. Feel free to look around, and see if the ads above and below has the content you are interested in (Well, you know...).

====== Programming ======
===== Angular (2+)=====
  * [[ng:Installing Angular Command Line Interface(CLI)]]
  * [[ng:Create a New Project]]
  * [[ng:Build Project that Needs to Use a Lot of Memory]]
  * [[ng:Proxy to Back-end For Development]]
  * [[ng:Add Dialog Component from Angular Material]]
  * [[ng:Observable Interval Subscription]]
  * [[ng:Adding Router to App]]
  * [[ng:Using Material Auto Complete]]

  * [[ng:Creating Component]]
  * [[ng:Directive *ngIf]]
  * [[ng:Directive ngStyle]]
  * [[ng:Directive ngClass]]
  * [[ng:Directive *ngFor]]
  * [[ng:Service]]
  * [[ng:EventEmitter]]
  * [[ng:@Input() @Output() for Child and Parent Component Communication]]
  * [[ng:Template Driven Form]]
  * [[ng:Reactive Form]]

===== CSS =====
  * [[css:Watermark]]

===== Gradle =====
  * [[gradle:Behind Proxy Server]]

===== Grails 3 Cookbook =====
  * [[grails:setup_grails_3_development_environment]]
  * [[grails:setup_grails_3_behind_proxy]]
  * [[grails:using_console_to_create_and_build_a_project]]
  * [[grails:using_intellij_idea_ultimate_ide]]
  * [[grails:grails_3_project_directories]]
  * [[grails:Data Source]]
  * [[grails:Multiple Data Sources]]
  * [[grails:Controller]]
  * [[grails:domain]]
  * [[Service]]
  * [[grails:URL Mappings]]
  * [[grails:mastering_gorm_dynamic_finders]]
  * [[grails:mastering_HQL]]
  * [[grails:mastering_Domain.createCriteria()]]
  * [[grails:adding_spring_security_plugin]]
  * [[grails:adding_customized_authentication_for_spring_security_plugin]]
  * [[grails:Spring Security Login Redirection]]
  * [[grails:reading_csv_files]]
  * [[grails:Quartz - Job Scheduler]]
  * [[grails:Rest Client with JSON]]
  * [[grails:Interceptor]]
  * [[grails:Goodies]]


===== HTML =====
  * [[html:Command HTTP Status Codes]]
  * [[html:Avoid Getting favicon.ico 404 Eror]]
  * [[html:HTML Header Redirection]]
===== Java =====
  * [[Insecurity HTTPS Connection]]
  * [[Adding CRT to Java CaCerts]]
  * [[java:Jasper Report]]
  * [[java:Apache POI Check if File Contains Macros]]
  * [[java:Basic Gson]]
  * [[java:Setting TrustStore and KeyStore in Runtime]]
  * [[java:Checking Memory Allocation]]
  * [[java:Resize Image with ImageIO and Graphics2D]]
  * [[java:File to String]]
  * [[java:Byte[] to File]]
  * [[java:Calling Native Windows DLL API with JNA]]
  * [[java:Levenshtein Distance]]
===== JavaScript =====
  * [[Bootstrap Confirmation]]  
  * [[Bootstrap 3 Datepicker]]
  * [[Bootstrap 3 Typeahead]]
  * DataTables JS
     * [[datatables:DataTables Basic]]
     * [[datatables:DataTables Set Column Width]]
     * [[DataTables Sorting]]
     * [[datatables:DataTables Rendering Column with Row Data]]
     * [[datatables:DataTables Ajax Request Data]]
  * [[Select2 JS]]
  * [[js:AJAX]]
  * [[js:AJAX-like jQuery File Download]]
  * [[js:Javascript String Functions]]
  * [[js:Javascript Promises]]
  * [[js:Javascript URLSearchParams]]
===== Maven =====
  * [[maven:Behind Proxy Server]]
  * [[maven:Add Local Repository for Project]]
  * [[maven:war to ear]]

===== Node.js =====
  * [[nodejs:Install Node.js]]
  * [[nodejs:Behind Proxy Server]]
  * [[nodejs:Install npx]]
  * [[nodejs:Using puppeteer to Capture Screenshot of a Website]]
===== React.js =====
**Prerequisite**
  * [[reject:JavaScript Arrow Function]]
**Basic**
  * [[reject:Create a Project]]
  * [[reject:What is JSX]]
  * [[reject:Components Functional VS Class-based]]
  * [[reject:Component Lifecycles]]
**Styling**
  * [[reject:Importing CSS file]]
  * [[reject:Inline style]]
  * [[reject:Dynamic Inline style]]
  * [[reject:Dynamic className]]
**props and state**
  * [[reject:props]]
  * [[reject:state]]
  * [[reject:using props, state, and binding]]
  * [[reject:prop-types, For Type Checking]]
  * [[reject:Passing Value, Reference Between Components]]
  * [[reject:Using List]]
  * [[reject:Redux]]
**Server Related**
  * [[reject:Connect to Server - AXIOS JS]]
  * [[reject:Router]]
**Material UI**
  * [[reject:Install]]
  * [[reject:Grid]]
  * [[reject:Flexbox]]
  * [[reject:Components]]
**Deployment**
  * [[reject:Deploy on WebLogic]]

===== Spring Boot / Spring =====
  * [[springboot:Start From Spring Initializr]]
  * [[springboot:CommandLineRunner]]
  * [[springboot:Run Spring Not as Server]]
  * [[springboot:Scheduling Task]]
  * [[springboot:Handling the Trailing Slash in URL]]
  * [[springboot:Mapping URL to Local File System]]
  * [[springboot:Hibinate 5 Ignore @Table, @column Name in Entity?]]
  * [[springboot:Deploy SpringBoot 2.3.1 on Weblogic 12c]]
  * [[springboot:Development and Production application.properties]]
  * [[springboot:Adding customized properties in application.properties file]]
  * [[springboot:Basic Websocket]]
==== Controller ====
  * [[springboot:Spring RestController]]
  * [[springboot:Spring RestController Better Error Handling]]
  * [[springboot:Spring Form Input]]
  * [[springboot:Spring Form Input From HttpServletRequest]]
==== DataSource ====
  * [[springboot:Using H2 As DataSource For Testing]]
  * [[springboot:Spring Basic JPA]]
  * [[springboot:Spring Using DataSource or JdbcTemplate]]
  * [[springboot:Having Spring to Create the Database Schema]]
  * [[springboot:Table Naming Being Ignored]]
  * [[springboot:Calling Stored Procedure with Output parameters]]
  * [[springboot:Spring JPA DTO mapping]]
  * [[springboot:Multiple Datasources]]
==== Security ====
  * [[springboot:Adding Customized Pre-Authentication]]
  * [[springboot:Spring Web Security]]
  * [[springboot:Spring Simple Username-Password Authentication with H2]]
  * [[springboot:Spring Simple Ajax Authentication]]
  * [[springboot:What is JSON Web Token (JWT)]]
  * [[springboot:Spring Simple JWT Authentication]]
==== Error Handling, Debugging ====
  * [[spring:ControllerAdvice for Catching Exception in Rest Controller]]
  * [[springboot:Display Detail Log in Debug Console]]
===== VBScript =====
  * [[VBScript:Print All Files in a Directory]]

====== Apache Http ======
  * [[httpd:Start Apache as Service on MS Windows]]
  * [[httpd:Virtual Host]]
  * [[httpd:Reverse Porxy]]
  * [[httpd:Setup TSL (https)]]

====== MS SQL Server ======
  * [[ms sql server:Performance Tuning]]
  * [[ms sql server:List Out All Tables and Fields]]
  * [[ms sql server:Alter nvarchar Size for a Column]]
  * [[ms sql server:Check Field Type of a Table]]
  * [[ms sql server:Exec Stored Procedure]]
  * [[ms sql server:Microsoft Clustering Fail-over Have Downtime]]

====== SSIS ======
  * [[ssis:Force to Fail an Expression for Testing]]
====== Ubuntu Server ======
  * [[ubunut:Disk Space Cleaning]]
  * [[ubunut:Ubuntu Full Backup]]
  * [[ubunut:Add HTTP Password Login to a Site]]
  * [[ubunut:Restore a Lost SSH Section]]
====== DokuWiki ======
  * [[Adding Google AdSense]]

====== JBoss ======
  * [[jboss:GC in jboss-cli]]

====== Hong Kong Government Open Data ======
  * [[Address Lookup Service]]

====== MS Windows ======
  * [[mswindows:Re-enable Task Manager]]

====== TSL Cert ======
  * [[tslcert:Creating Cert]]
  * [[tslcert:Check Remote Server Cert with Openssl]]
====== iptables ======
  * [[Level 4 (TCP, UDP) tunneling]]
  * [[iptables:Open Port]]
====== Docker ======
  * [[Useful Commands]]
====== Somthing Else ======
  * [[else:How to Backup a DVD to MP4]]
  * [[else:DVR-Scan]]
  * [[else:Generate Battery Report in Win10]]
  * [[else:Port Scan with Microsoft portqry]]
  * [[else:curl]]
  * [[else:OwnCloud]]

  * [[else:This page statistics]]