Tutorial by Examples: en

Opening a connection to CouchDB

HttpClient httpClient = new StdHttpClient.Builder(). url("http://yourcouchdbhost:5984"). username("admin"). password("password"). build(); CouchDbInstance dbInstance = new StdCouchDbInstance(httpClient);

Different ways to Select from DropDown list

Below is and HTML page <html> <head> <title>Select Example by Index value</title> </head> <body> <select name="Travel"><option value="0" selected> Please select</option> <option value="1">Car</option&...

Behavior Implementation

using System; using System.Collections.Generic; using System.Runtime.InteropServices; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Interactivity; using System.Windows.Media; using System.Windows.Media.Imaging; namespace MyBehavior...

Enum matching

Assume the following enum: enum Operation { Multiply(left : Int, right : Int); } Enum matching can be performed as follows: var result = switch(Multiply(1, 3)) { case Multiply(_, 0): 0; case Multiply(0, _): 0; case Multiply(l, r): l * r; } Ref...

Use custom middleware + Superagent

This is example has extracted from this boilerplate. Custom middleware: export default function clientMiddleware() { return ({dispatch, getState}) => { return next => action => { if (typeof action === 'function') { return action(dispatch, getState); } ...

Ninject Dependency Injection

Dependency resolver is used to avoid tightly-coupled classes, improve flexibility and make testing easy. You can create your own dependency injector (not recomended) or use one of well-written and tested dependency injectors. In this example I am going to use Ninject. Step one: Create dependency re...

Difference between Tk and Toplevel

Tk is the absolute root of the application, it is the first widget that needs to be instantiated and the GUI will shut down when it is destroyed. Toplevel is a window in the application, closing the window will destroy all children widgets placed on that window{1} but will not shut down the program...

Generating Dictionary From IEnumerable

' Just setting up the example Public Class A Public Property ID as integer Public Property Name as string Public Property OtherValue as Object End Class Public Sub Example() 'Setup the list of items Dim originalList As New List(Of A) originalList.Add(New A() With {...

Saving a buffer in a non-existent dir

:!mkdir -p %:h to create the missing directories, then :w
vim • Saving

Edit row details using sub-element

This example uses a separate element to edit bound data to the row-detail template. Working jsBin <!DOCTYPE html> <html> <head> <base href="https://polygit.org/polymer+:master/iron-data-table+Saulis+:master/components/"> <link rel="import&q...

Select row, prevent deselection

Default behavior is to de-select row when clicked twice. In some use cases, you might want to disable this de-selecting behavior. Note table.deselectItem(item) method will imperatively deselect an item. This works with both item or index (when using items array) as an argument. Working jsBin &lt...

Sensitivity lists and wait statements

A process with a sensitivity list cannot also contain wait statements. It is equivalent to the same process, without a sensitivity list and with one more last statement which is: wait on <sensitivity_list>; Example: process(clock, reset) begin if reset = '1' then q &l...
vhdl • Wait

Simple implementation example

apply plugin: 'com.android.library' apply plugin: 'maven' apply plugin: 'maven-publish' android { compileSdkVersion 21 buildToolsVersion "21.1.2" repositories { mavenCentral() } defaultConfig { minSdkVersion 9 targetSdkVersion 21 versionCode 1 version...

Inspecting Meteor Objects on the Client

Since Nightwatch has access to the browser console, it's possible to inspect client side objects using the .execute() API. In the following example, we're checking the Session object for a particular session variable. First, we begin by creating the file ./tests/nightwatch/api/meteor/checkSession...

Components & Page Objects

Page Objects are similar to Custom Commands; except they are collections of custom commands that are associated with a specific UI component. This works extremely well with modern component based design, such as in React. module.exports = { url: 'http://localhost:3000/login', commands: [{ ...

Appending a new row to DataFrame

In [1]: import pandas as pd In [2]: df = pd.DataFrame(columns = ['A', 'B', 'C']) In [3]: df Out[3]: Empty DataFrame Columns: [A, B, C] Index: [] Appending a row by a single column value: In [4]: df.loc[0, 'A'] = 1 In [5]: df Out[5]: A B C 0 1 NaN NaN Appending a ...

Getting Started with OpenCV 3.1 on Windows

We install OpenCV 3.1.0 on Windows and get started. There are two ways to install OpenCV on windows. One is to download the installer and run it. Other is to build from source. This is the easiest way to install OpenCV and get started. OpenCV gives pre-build binaries to install on Windows here. Aft...

Generic Interfaces

Like classes, interfaces can receive polymorphic parameters (aka Generics) too. Declaring Generic Parameters on Interfaces interface IStatus<U> { code: U; } interface IEvents<T> { list: T[]; emit(event: T): void; getAll(): T[]; } Here, you can see that our t...

Rendering pagination in Jinja

Here we use the object that we passed to render_template to display the pages, the current active page, and also a previous and next buttons if you can go to the previous/next page. <!-- previous page --> {% if users_list.has_prev %} <li> <a href="{{ url_for('users', page...

Configuration to get Guice injection on Websocket endpoints

First, we need a custom endpoint builder. public class WSConfigurator extends ServerEndpointConfig.Configurator { @Inject private static Injector injector; @Override public <T> T getEndpointInstance(Class<T> endpointClass) throws InstantiationException { ...

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