Tutorial by Examples: n

In this example, I created a form which is used to register a new user. In the options passed to the form, I give the different roles a user can have. Creating a reusable class for my form with configured data class and an extra option that fills the choice field to pick a userrole: class UserType...

To be able do deal with form events, it's important to attach the request, that is send to a controller action after submitting a form, to the form created in that action. public function registerAction(Request $request) { $data = new ExampleObject(); $form = $this->createForm(Example...

Basic grid In Ionic you can declare rows by setting the row class to a element. Rows will be elements which are horizontally aligned and anything inside this element everything will belong to the row. Inside the row you can declare different width columns. You have a choice of the following declara...

Almost every application has some kind of a list. Ionic has it's own build-in ready-to-go list item CSS declarations to make it easy to do lists inside your application. You can either use HTML elements and declare a class for the or use the directive ion-list to make them. Example of a directive is...

Assume you want to undo a dozen of commits and you want only some of them. git rebase -i <earlier SHA> -i puts rebase in "interactive mode". It starts off like the rebase discussed above, but before replaying any commits, it pauses and allows you to gently modify each commit as i...

docker logs --follow <containerid> This tails the output of the running container. This is useful if you did not set up a logging driver on the docker daemon.

By default the ArrayAdapter creates a view for each array item by calling toString() on each item and placing the contents in a TextView. Example: ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, myStringArray); where androi...

AmCharts provides a load-balanced, reliable CDN for loading the libraries directly from our web server. Use https://www.amcharts.com/lib/3/ as a base URL for includes. <script src="https://www.amcharts.com/lib/3/amcharts.js"></script> <script src="https://www.amcharts...

To do that, [download][1] a required amCharts product ZIP archive. Unzip it and place somewhere on your web server. I.e. in /amcharts/ sub-directory. Then simply load them using <script> tags: <script src="amcharts/amcharts.js"></script> <script src="amcharts/...

Besides main required functional includes, you may need other includes, like themes and plugins. Those reside in /themes/ and /plugins/ sub-directories respectively. I.e.: <script src="https://www.amcharts.com/lib/3/amcharts.js"></script> <script src="https://www.amc...

wxPython Phoenix is the latest version of wxPython, (currently Sept 2016 without an official release). It supports both Python 2 and Python 3. You can download a snapshot build (i.e. a Python wheel) for your platform and Python version here. wxPython Phoenix utilizes a largely automated mechanism ...

The CEILING function rounds a number up, away from zero, to the nearest multiple of significance. The FLOOR function does the same by rounds the number down towards zero. An example of when CEILING could be be used is if you want to avoid using pennies in your prices and your product is priced at $...

The FIXED function rounds a number to the specified number of decimals defined by the decimals parameter, formats the number in decimal format using a comma as a separator unless specified as not required defined by the parameter no_commas, and returns the result as text. The decimals parameter is o...

The where construct, available in Fortran90 onwards represents a masked do construct. The masking statement follows the same rules of the if statement, but is applied to all the elements of the given array. Using where allows operations to be carried out on an array (or multiple arrays of the same s...

Consider a structure of the following classes should be constructed in XAML an then read into a CLR object: namespace CustomXaml { public class Test { public string Value { get; set; } public List<TestChild> Children { get; set; } = new List<TestChild>(); ...

Consider a structure of the following classes should be constructed in XAML an then read into a CLR object: namespace CustomXaml { public class Test { public string Value { get; set; } public List<TestChild> Children { get; set; } = new List<TestChild>(); ...

sed -i -e cmd file will modify file even if its permissions are set to read-only. This command behaves similarly to sed -e cmd file > tmp; mv -f tmp file rather than sed -e cmd file > tmp; cat tmp > file; rm tmp The following example uses gnu sed: $ echo 'Extremely important data' &gt...

printf will output a formatted string using placeholders sprintf will return the formatted string $name = 'Jeff'; // The `%s` tells PHP to expect a string // ↓ `%s` is replaced by ↓ printf("Hello %s, How's it going?", $name); #> Hello Jeff, How's it going? // Ins...

You can use concatenation to join strings "end to end" while outputting them (with echo or print for example). You can concatenate variables using a . (period/dot). // String variable $name = 'Joel'; // Concatenate multiple strings (3 in this example) into one and echo it once done. ...

You can also use interpolation to interpolate (insert) a variable within a string. Interpolation works in double quoted strings and the heredoc syntax only. $name = 'Joel'; // $name will be replaced with `Joel` echo "<p>Hello $name, Nice to see you.</p>"; # ...