Tutorial by Examples: control

It is very common to get a StackOverflowError error while calling recursive function. Scala standard library offers TailCall to avoid stack overflow by using heap objects and continuations to store the local state of the recursion. Two examples from the scaladoc of TailCalls import scala.util.cont...

PrepareForSegue: func prepareForSegue(_ segue:UIStoryboardSegue, sender sender:AnyObject?) Notifies the view controller that a segue is about to be performed Parameters segue: The segue object. sender: The object that initialized the segue. Example in Swift Perform a task if the ident...

setuptools_scm is an officially-blessed package that can use Git or Mercurial metadata to determine the version number of your package, and find Python packages and package data to include in it. from setuptools import setup, find_packages setup( setup_requires=['setuptools_scm'], use_...

In this example we will implement a custom Checkbox for Android and iOS. Creating the Custom Control namespace CheckBoxCustomRendererExample { public class Checkbox : View { public static readonly BindableProperty IsCheckedProperty = BindableProperty.Create<Checkbox, bool&gt...

A controller is a class that handles HTTP requests. You create a separate controller for each entity set in your OData service. In this tutorial, you will create one controller, for the Product entity. In Solution Explorer, right-click the Controllers folder and select Add > Class. Name the clas...

Create a Laravel application: $ composer create-project laravel/laravel hello-world Navigate to the project folder, e.g. $ cd C:\xampp\htdocs\hello-world Create a controller: $ php artisan make:controller HelloController --resource This will create the file app/Http/Con...

ASP.NET validation controls validate the user input data to ensure that useless, unauthenticated, or contradictory data don't get stored. ASP.NET provides the following validation controls: RequiredFieldValidator RangeValidator CompareValidator RegularExpressionValidator CustomValidator Val...

The RequiredFieldValidator control ensures that the required field is not empty. It is generally tied to a text box to force input into the text box. The syntax of the control is as given: <asp:RequiredFieldValidator ID="rfvcandidate" runat="server" ControlToValidate =&...

The RangeValidator control verifies that the input value falls within a predetermined range. It has three specific properties: PropertiesDescriptionTypeIt defines the type of the data. The available values are: Currency, Date,MinimumValueIt specifies the minimum value of the range.MaximumValueIt s...

The CompareValidator control compares a value in one control with a fixed value or a value in another control. It has the following specific properties: PropertiesDescriptionTypeIt specifies the data type.ControlToCompareIt specifies the value of the input control to compare with.ValueToCompareIt ...

In the scenario that a controller throws an exception, we can define exception handler methods to build and return specific responses. It is important to note that the defined exception handlers within the given controller will only apply to exceptions that occur within that controller. @Controller...

Create a new controller foreg ControllerName: "Home", ActionresultName :"Index" open AreaRegistraion.cs and add the controller name and action name to be rerouted to context.MapRoute( "nameofarea_default", "nameofarea/{controller}/...

You can place action filters at three possible levels: Global Controller Action Placing a filter globally means it will execute on requests to any route. Placing one on a controller makes it execute on requests to any action in that controller. Placing one on an action means it runs with the...

If you are using Sublime Text 3 then the simplest way to install Package Control is to select Install Package Control in the Tools menu or in the Command Palette and Sublime Text will install it automatically. Manually Installing: For Sublime Text 2, older versions of Sublime Text 3, or if you hav...

If your page is for displaying or editing information about a particular type of record, it may be helpful to use a standard controller to reduce the amount of boilerplate code you need to write. By using a standard controller, your page will be displayed with an ?id=SALESFORCE_ID parameter, and yo...

//Create a layout var tableLayout = new sap.ui.commons.layout.MatrixLayout({ layoutFixed : false, columns : 2, width : "100%", height : "100%", widths : [ "20%","80%"] }).addStyleClass('dsAvailLayout'); sap.ui.table.Table.extend(...

To implement the create functionality we need two actions: GET and POST. The GET action used to return view which will show a form allowing user to input data using HTML elements. If there are some default values to be inserted before user adding any data, it should be assigned to the view mode...

By the url ~/Student/Details/5 being: (~: site root, Student: Controller, Details: Action, 5: student id), it is possible to retrieve the student by its id. // GET: Student/Details/5 public ActionResult Details(int? id) { // it good practice to consider that things could go wrong...

ASP.NET provides the following controls Drop-down list List box Radio button list Check box list Bulleted list These control let a user choose from one or more items from the list. List boxes and drop-down lists contain one or more list items. These lists can be loaded either by code or b...

The HyperLink control is like the HTML element. Basic syntax for a hyperlink control: <asp:HyperLink ID="HyperLink1" runat="server"> HyperLink </asp:HyperLink> It has the following important properties: PropertiesDescriptionImageUrlPath of the image to be ...