Tutorial by Examples: w

Watchers needed for watch some value and detect that this value is changed. After call $watch() or $watchCollection new watcher add to internal watcher collection in current scope. So, what is watcher? Watcher is a simple function, which is called on every digest cycle, and returns some value. An...

These functions are very similar in behaviour. The difference is that ng-if removes elements from the DOM. If there are large parts of the code that will not be shown, then ng-if is the way to go. ng-show will only hide the elements but will keep all the handlers. ng-if The ngIf directive removes ...

while loop iterates through a block of code as long as a specified condition is true. $i = 1; while ($i < 10) { echo $i; $i++; } Output: 123456789 For detailed information, see the Loops topic.

do-while loop first executes a block of code once, in every case, then iterates through that block of code as long as a specified condition is true. $i = 0; do { $i++; echo $i; } while ($i < 10); Output: `12345678910` For detailed information, see the Loops topic.

You must be very careful when providing a forwarding reference overload as it may match too well: struct A { A() = default; // #1 A(A const& ) = default; // #2 template <class T> A(T&& ); // #3 }; The intent here was that A is c...

Creating and returning an image object by loading the image data from the file at the specified path. Example: UIImage *image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:[cellCountry objectForKey:@"Country_Flag"] ofType:nil]]; Using Array: Example NSM...

The minimum required to use Webpack is the following command: webpack ./src/index.js ./dist/bundle.js // this is equivalent to: webpack source-file destination-file Web pack will take the source file, compile to the output destination and resolve any dependencies in the source files.

Active patterns are just simple functions. Like functions you can define additional parameters: let (|HasExtension|_|) expected (uri : string) = let result = uri.EndsWith (expected, StringComparison.CurrentCultureIgnoreCase) match result with | true -> Some true | _ -> N...

SP.SOD.executeOrDelayUntilScriptLoaded(showDialog,"sp.js"); function showDialog(){ var options = SP.UI.$create_DialogOptions(); options.url = "/mySite/lists/myList/NewForm.aspx"; options.dialogReturnValueCallback = myCallBackFunction; SP.UI.ModalDialog.show...

SP.SOD.executeOrDelayUntilScriptLoaded(showDialog,"sp.js"); function showDialog(){ SP.UI.ModalDialog.showModalDialog( { url: "/org/it/web/wik/Lists/ExampleCode/DispForm.aspx?ID=6" } ); }

SP.SOD.executeOrDelayUntilScriptLoaded(showDialog,"sp.js"); function showDialog(){ var dialogOptions = SP.UI.$create_DialogOptions(); dialogOptions.title = "Your Title Here!"; var dummyElement = document.createElement("div"); dummyElement.style.te...

A do-while loop is very similar to a while loop, except that the condition is checked at the end of each cycle, not at the start. The loop is therefore guaranteed to execute at least once. The following code will print 0, as the condition will evaluate to false at the end of the first iteration: i...

var ws = new WebSocket('ws://host.com/path'); ws.onopen = () => { // connection opened ws.send('something'); // send a message }; ws.onmessage = (e) => { // a message was received console.log(e.data); }; ws.onerror = (e) => { // an error occurred console.log(e...

It should be noted that Fetch does not support progress callbacks. See: https://github.com/github/fetch/issues/89. The alternative is to use XMLHttpRequest https://developer.mozilla.org/en-US/docs/Web/Events/progress. fetch('https://mywebsite.com/mydata.json').then(json => console.log(json)); ...

var request = new XMLHttpRequest(); request.onreadystatechange = (e) => { if (request.readyState !== 4) { return; } if (request.status === 200) { console.log('success', request.responseText); } else { console.warn('error'); } }; request.open('GET', 'https://my...

Note: You cannot develop react-native apps for iOS on Windows, only react-native android apps. The official setup docs for react-native on windows can be found here. If you need more details there is a granular guide here. Tools/Environment Windows 10 command line tool (eg Powershell or window...

Starting with Asp.net 4.5 web controls can take advantage from strongly-typed binding to get IntelliSense support and compiletime errors. Create a class, which holds your model: public class Album { public int Id { get; set; } public string Name { get; set; } public string Artist {...

class Skill(models.Model): name = models.CharField(max_length=50) description = models.TextField() class Developer(models.Model): name = models.CharField(max_length=50) skills = models.ManyToManyField(Skill, through='DeveloperSkill') class DeveloperSkill(models.Model): ...

In MATLAB versions prior to R2014b, using the old HG1 graphics engine, it was not obvious how to create color coded 2D line plots. With the release of the new HG2 graphics engine arose a new undocumented feature introduced by Yair Altman: n = 100; x = linspace(-10,10,n); y = x.^2; p = plot(x,y,'r...

If you don't know which options you should use, you may be interested in the :options command. This will open a split with all Vim options listed and with their current value displayed. There are 26 sections to display all options you can try. e.g. 4 displaying text scroll number of lines t...