Tutorial by Examples: el

let sel = document.getSelection(); let myNode = document.getElementById('element-to-select'); let range = document.createRange(); range.selectNodeContents(myNode); sel.addRange(range); It may be necessary to first remove all the ranges of the previous selection, as most browsers don't s...

let sel = document.getSelection(); let text = sel.toString(); console.log(text); // logs what the user selected Alternatively, since the toString member function is called automatically by some functions when converting the object to a string, you don't always have to call it yourself. console...

In case you need to read an array elements avoiding repetitions you case use the #uniq method: a = [1, 1, 2, 3, 4, 4, 5] a.uniq #=> [1, 2, 3, 4, 5] Instead, if you want to remove all duplicated elements from an array, you may use #uniq! method: a = [1, 1, 2, 3, 4, 4, 5] a.uniq! #=> [1...

Select the .xcdatamodeld file. You will notice you have no entities. You will have to create one yourself. At the bottom of Xcode you will notice a button that says "Add Entity" click it and you will have a new entity for you to work with on the project. In this step there are ...

Pattern matching can be used to deconstruct records. We illustrate this with a record type representing locations in a text file, e.g. the source code of a program. type location = { filename : string; line: int; column: int; offset: int; } A value x of type location can be deconstr...

// assume a Request and RequestQueue have already been initialized somewhere above public static final String TAG = "SomeTag"; // Set the tag on the request. request.setTag(TAG); // Add the request to the RequestQueue. mRequestQueue.add(request); // To cancel this specific re...

Sometimes we need to change type from Collection<T?> to Collections<T>. In that case, filterNotNull is our solution. val a: List<Int?> = listOf(1, 2, 3, null) val b: List<Int> = a.filterNotNull()

3 You can use rem defined by the font-size of your html tag to style elements by setting their font-size to a value of rem and use em inside the element to create elements that scale with your global font-size. HTML: <input type="button" value="Button"> <input type=...

localStorage.length property returns an integer number indicating the number of elements in the localStorage Example: Set Items localStorage.setItem('StackOverflow', 'Documentation'); localStorage.setItem('font', 'Helvetica'); localStorage.setItem('image', 'sprite.svg'); Get length localSto...

This is your cluster.js: const cluster = require('cluster'); const http = require('http'); const numCPUs = require('os').cpus().length; if (cluster.isMaster) { // Fork workers. for (let i = 0; i < numCPUs; i++) { cluster.fork(); } cluster.on('exit', (worker, code, signal)...

In Terminal on your Mac operating system, enter the following 2 commands: lsbom -f -l -s -pf /var/db/receipts/org.nodejs.pkg.bom | while read f; do sudo rm /usr/local/${f}; done sudo rm -rf /usr/local/lib/node /usr/local/lib/node_modules /var/db/receipts/org.nodejs.*

This is a shell session showing how to create a "Hello world" program and run it with Cargo: $ cargo new hello --bin $ cd hello $ cargo run Compiling hello v0.1.0 (file:///home/rust/hello) Running `target/debug/hello` Hello, world! After doing this, you can edit the progra...

In Python 3, PEP 404 changes the way imports work from Python 2. Implicit relative imports are no longer allowed in packages and from ... import * imports are only allowed in module level code. To achieve Python 3 behavior in Python 2: the absolute imports feature can be enabled with from __futu...

In order to have google maps work properly with turbolinks, add the javascript tag directly to the layout header rather than including it in a view. # app/views/layouts/my_layout.html.haml !!! %html{:lang => 'en'} %head - # ... = google_maps_api_script_tag The google_maps_api_s...

Suppose, your users and/or groups have profiles and you want to display address profile fields on a google map. # app/models/profile_fields/address.rb class ProfileFields::Address < ProfileFields::Base # Attributes: # label, e.g. "Work address" # value, e.g. "Willy-Bran...

To display address profile fields as markers on a google map, the address field objects need to be passed as json objects to javascript. Regular database attributes When calling to_json on an ApplicationRecord object, the database attributes are automatically exposed. Given a ProfileFields::Addre...

A has_and_belongs_to_many association creates a direct many-to-many connection with another model, with no intervening model. For example, if your application includes assemblies and parts, with each assembly having many parts and each part appearing in many assemblies, you could declare the models...

If you want to create multiple uploads, first thing you might want to do is create new model and set up relations Let's say you want an multiple images for the Product model. Create an new model and make it belongs_to your parent model rails g model ProductPhoto #product.rb has_many :product_p...

“Fat Model, Skinny Controller” refers to how the M and C parts of MVC ideally work together. Namely, any non-response-related logic should go in the model, ideally in a nice, testable method. Meanwhile, the “skinny” controller is simply a nice interface between the view and model. In practice, this...

Add below to your build.gradle out of android tag: // Apply plug-in to app. apply plugin: 'com.google.gms.google-services' Add below helper class to your util package: /** * Created by Andy */ public class GoogleSignInHelper implements GoogleApiClient.OnConnectionFailedListener, ...