PRACTICAL ANGULARJS PDF
This book contains the AngularJS related blog posts posted on Dinis Cruz' blog at ppti.info Practical AngularJS. Real-world examples of using AngularJS in multiple scenarios and platforms (KarmaJS, Firebase, Eclipse, WebStorm, O2 Platform). can build an exciting application from top to bottom with AngularJS, while . The goal of this book is to equip you, the reader, with an arsenal of practical tech-.
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AngularJS in 19 days. AngularJS v, ppti.info MVC and Visual Studio ABSTRACT. This book is a collection of 20 posts on AngularJS that got published . To fulfil the requirements, AngularJS, a modern framework, was used for its. Model-View-Controller .. tion process is where the system is installed and put into practical use. During can print the chart data as PDF file for report purposes. CS Lecture Notes - AngularJS. Angular Concepts and Terminology. Template . HTML with additional markup used to describe what should be displayed.
The key word here is asynchronous - we return control to the browser, let it make a request and give it a function to call when the request completes. So let's see how you actually make the request.
Remember, the functions we pass to success or error will be called later - when this block is finished executing we don't have the name, we've just specified what to do when we do eventually get it - or what to do if we fail to get it.
That's all there is to it - a promise lets us specify what to do as the result of an operation. How do Promises Work? Promises are not actually complicated, they're objects that contain a reference to functions to call when something fails or succeeds. You can see the library at github. This was a deliberate decision, as the Q library is widely used and well understood by the community. A Real World Example In this example we'll create a service that gets the user's name, just like in our examples.
However, to make it interesting, we'll set our service up so that the first time we get the name from the server, and then afterwards we'll return a cached copy. This means we'll have to build our code to deal with the asynchronous case the first one and the more trivial synchronous case getting the name from the cache.
Let's look at a pure asynchronous implementation.
You can click on 'Update' name to get the name, but each time it sends a request. This is what we'll change next. Now let's update our service so that we hit the server only if we haven't already cached the name. I'll build the service blow by blow, then we can see a fiddle of it working. It has a name field which is initially null.
This object contains the promise we'll return, and has some helper functions to let us build the promise. We create a deferred object because whether we use ajax or not, we want the consumer to use the promise - even if we can return straightaway in some circumstances when we have the name we can't in all - so the caller must always expect a promise.
I've added 'from cache' to the name so we can see when it comes from the cache compared to the server.
Tip: You can resolve a promise even before you return it. It still works fine for the consumer. Otherwise, we reject it, which means failure. Call resolve on a deferred object to complete it successfully, call reject to fail it with an error.
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Finally, we just return the promise we've built with deferred: return deferred. You can see it in action below, press 'Update Name' a few times and you'll see it uses the cache.
How do we use this? We'll it's simple, here's a controller that uses the service we've built: app. Before, we might have used the error or success function of the promise.
But here we use then. Why is that? They're not standard, you won't find them on other promises. It would be sensible to think that these functions are a standard part of promise - but they're not!
When you are using a promise, the function you should call is then. For one thing, the error function gives us a response and status and more and the success function gives us the response data rather than the full response object. But remember that it's not a standard part of a promise.
You can can add your own versions of these functions to promises you build yourself if you want: promise. So what's the advice? A safe approach is to use then wherever possible. One useful aspect of promises is that the then function returns the promise itself. This means that you can actually chain promises, to create conscise blocks of logic that are executed at the appropriate times, without lots of nesting.
Let's consider an example where we need to fetch the user's name from the backend, but we have to use separate requests to get their profile information and then their application permissions. Because the active variable is not set initially, this will cause the first paragraph to be visible. When it changes, it causes the HTML that uses it to be updated automatically. In Angular's terminology, this variable is called a model. It is available to all directives in the current scope, and can be accessed in your controllers more on that in the next example.
When the framework sees such a string, it replaces it with the contents of the variable. This operation is repeated every time var is changed. Inline Editor For the second example, we will create a simple inline editor - clicking a paragraph will show a tooltip with a text field.
We will use a controller that will initialize the models and declare two methods for toggling the visibility of the tooltip. Any changes to the text field will automatically update the value, and all other bindings on the page that depend on it.
In this case it will hide the tooltip. Adding properties or functions to it makes them available to the view. Using the ng-model binding on the text field tells Angular to update that variable when the value of the field changes this in turn re-renders the paragraph with the value. Order Form In this example, we will code an order form with a total price updated in real time, using another one of Angular's useful features - filters.
Filters let you modify models and can be chained together using the pipe character. In the example below, I am using the currency filter , to turn a number into a properly formatted price, complete with a dollar sign and cents.
You can easily make your own filters, as you will see in example 4. Format it as currency. It lets you loop through an array of items and generate markup for them. It is intelligently updated when an item is changed or deleted. Note: For a more complete version, see this tutorial , which is based on this one , written with Backbone. Instant Search This example will allow users to filter a list of items by typing into a text field. This is another place where Angular shines, and is the perfect use case for writing a custom filter.
Creating a filter then is as simple as calling the filter method on the module object returned by angular. Notice the custom search filter "searchFor". It takes the value of the searchString model as an argument. The array holds the names of dependencies if any.
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You can use this filter in all your views and even combine it with others through chaining.In the end. You can easily make your own filters, as you will see in example 4. However, there is much to learn if you want to be a pro.
I've added 'from cache' to the name so we can see when it comes from the cache compared to the server. This is because all the code for the site is retrieved up-front or dynamically loaded as necessary to create an experience that feels more like a desktop application than a traditional, multi-page website. Finally, we just return the promise we've built with deferred: return deferred.
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