Understanding USB cable Types


Computers and electronic devices have some form of USB connection, and many devices also come packaged with a USB cable. What are all these different cables for and does it matter which one you use?

For now, yes it does matter. This may change in the near future.

Universal Serial Bus (USB) is an industry standard developed in the mid-1990s to standardize the connection of computer peripherals to computers. It replaced a number of earlier interfaces and is now the most popular connector type for consumer devices.

Here’s everything you need to know about the USB standard in terms of cable availability.

The Types of USB

Continue reading “Understanding USB cable Types”

Change file_field_tag appearance



<span class="btn btn-large btn-warning btn-file">
    Choose File
    <%= file_field_tag :attachment %>


.btn-file {
    position: relative;
    overflow: hidden;

.btn-file input[type=file] {
    position: absolute;
    top: 0;
    right: 0;
    min-width: 100%;
    min-height: 100%;
    font-size: 100px;
    text-align: right;
    filter: alpha(opacity=0);
    opacity: 0;
    outline: none;
    background: white;
    cursor: inherit;
    display: block;

Ruby on Rails: putting class with submit_tag

<%= submit_tag("Update", :id=>"button", :class=>"Test", :name=>"submit") %>

First parameter is required and it would be value and they any parameter you want to specify, can be done in a hash like :key=>”value”.

stop event propagation

SO we will stop propagation at that point so that click will be performed for one div.

Sample Code-

<!DOCTYPE html>
<title>Check Out Propagation</title>
</div> </div> <style type="text/css"> #third{ height: 300px; width: 300px; background-color: black; } #outer{ height: 200px; width: 200px; background-color: red; } #inner{ height: 100px; width: 100px; background-color: yellow; } </style> function innerFunc(event){ event.stopPropagation(); console.log("inner was cliked"); } function outerFunc(event){ event.stopPropagation(); console.log("outer was cliked"); } function thirdFunc(event){ console.log("third was cliked"); } var inner = document.getElementById('inner'); inner.addEventListener('click', innerFunc); var outer = document.getElementById('outer'); outer.addEventListener('click', outerFunc); var third = document.getElementById('third'); third.addEventListener('click', thirdFunc); function mouseOver(event){ console.log("mouse over third"); } third.addEventListener('mouseover', mouseOver); </body></html>

Deploy Rails to Heroku

Follow these steps for deploying your app on heroku.

  1. Create a new Heroku account.
  2. In the terminal, log in using the email address and password of Heroku account:
    $ heroku login
  3. In Gemfile, add the pg gem to your Rails project. Change:
    gem sqlite


    gem 'sqlite3', group: :development
    gem 'pg', '0.18.1', group: :production
  4. In Gemfile, add the rails_12factor gem::
    gem 'rails_12factor', group: :production
  5. In the terminal, install the gems using:
    $ bundle install
  6. Check config/database.yml is using the postgresql adapter. Change:
      <<: *default
      database: db/production.sqlite3


      <<: *default
      adapter: postgresql
      database: db/production.sqlite3
  7. Commit your changes to git:
    $ git add .
    $ git commit -m "My first Commit"
  8. In the terminal, create an app on Heroku:
    $ heroku create
  9. Push your code to Heroku:
    $ git push heroku master
  10. If you are using the database in your application, migrate the database by running:
    $ heroku run rake db:migrate
  11. If you need to seed your database with data, run:
    $ heroku run rake db:seed
  12. Get the URL of your app and visit it in the browser:
    $ heroku apps:info

    This will open your app on browser.

Create unique id in link_to tag rails

<%= link_to "Edit", edit_question_path(question.id),method: :get, :remote => true, id: "myBtn_#{question.id}" %>

This is how you can create a unique id using #.

id: “myBtn_#{question.id}”



Delete using ajax and fade out


Step 1: In your index.html.erb  Add

:remote => true, :class => 'class_name' in


Like this,

<%= link_to "Delete", question_path(question.id),method: :delete ,data: { confirm: "Are you sure?"}, :remote => true, :class => "delete_question"%>

Step 2: Create a file, destroy.js.erb, put it inside folder .erb files (under app/views/controller_name). It should look like this:

console.log("here") noty({text: 'Question is successfully destroyed!!', type: 'success', timeout: 1500, theme: 'defaultTheme',maxVisible: 5,template: '
',progressBar: true}); 
$(function() {    

now , if you got the above code its good else I m expaining too.

So, console.log (“here”) is just to check if we are redirected to right page or in simple words wheather ajax is working or not.

noty is just a notification for this you have to install noty.

If you dont able to install ,I will definetly write in other blog till then delete whole noty statement.

here comes the main part i.e. the function

a Simple function in which I am passing the id of class which is to unique so i have added  the id of each question like here so as to make it unique.

Step 3: Add format.js { render :layout => false } to your controller (app/controllers/question_controller.rb). Your destroy method should now look like this:

def destroy
 respond_to do |format|
 format.html { redirect_to '/', notice: 'Question was successfully destroyed.' }
 format.json { head :no_content }
 format.js { render :layout => false }

And now you are done.

Hope it helps.


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