Building real-time chat app using WebSockets with AWS API Gateway and Lambda
We can build many real-time applications such as chat applications, multiplayer games, financial trading platforms, and collaboration platforms using WebSockets with AWS API Gateway, Lambda, and dynamoDB. In this blog we will learn how to build real-time applications using WebSockets
IE11 – How to view webpage in different IE versions
Follow these steps to view the webpage in different versions of IE: 1. Open IE11. 2. Press F12 key. 3. Click on “Edge” that is displayed to the right side of the console bar. See screenshot below: 4. On clicking
Moodle | Fetch Site-Administrator user records from Moodle/Totara database
Steps : 1. Open mdl_config table in Moodle/Totara database. 2. Look for the record with name field set to “siteadmins”. 3. The value field will contain comma separated list of user-ids that have administrative access to site. Screen Shot below
Salesforce | Uploading and using images in Visualforce page
When there is requirement of displaying images in a Visualforce page, following methods can be adopted: Method 1: If the image is present on another website/server. Use this code: <apex:image url=”Paste URL of the image” styleClass=”imageStyle”/> Method 2: Uploading image in “Static
Salesforce | How to show different apex message at different places on clicking a single button?
In a Visualforce page we have multiple UI blocks (for simplicity we have considered only 2 blocks below). In each block we have a form with some html elements and few action buttons to submit form of only that block.
Moodle/Totara | How to give Grade to user in enrolled course
To give grade to user enrolled in course follow the below steps: 1. Open the course in which user is enrolled: 2. To the left, click on link labelled “Grades” as shown below: 3. Click on the button “Turn editing
Eclipse Luna | Dark theme and window split
1. You can select a dark theme for Eclipse Lune now: To use the dark theme, go to Window -> Preferences -> General -> Appearance and choose ‘Dark’. 2. Editors can be split horizontally ( CTRL+_ ) or vertically (
FileZilla | How to switch from current editor to other editor
To get Eclipse or any other editor to open the file by default every time you download a file from fileZilla follow these steps: Open terminal and find path from which your editor executes using which command. $ which eclipse
Integrate Axis2 and Rampart
Follow these steps to integrate Axis2 and Rampart: 1. Download axis2 from the below link: Click 2. Download Rampart. 3. Set AXIS2_HOME using below commands on terminal: $ vi /home/user/.bashrc Add below line to the end of the file: export AXIS2_HOME=/home/user/Downloads/axis2-1.6.4/ “
Ubuntu | Google Authenticator not working with SSH keys
Purpose is to get MFA/ 2-step verification working i.e. google-authenticator + ssh Keys First of all, install google authenticator on your server with following steps: 1. Yum install google-authenticator.x86_64 (Redhat/Centos) sudo apt-get install libpam-google-authenticator (ubuntu OS) 2. Now vi /etc/pam.d/sshd (add following