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Download AngularJS Directives by Alex Vanston PDF

By Alex Vanston

AngularJS Directives serves as an in-depth research of a few of the center good points of AngularJS and offers you with all of the wisdom you want to create totally dynamic internet purposes that reply in real-time to alterations in info. Youll find out how to construct directives from the floor up in addition to the very best practices for architecting them. by means of the top of this publication, youll have the ability to create an online program made out of a number of modules all operating jointly seamlessly to supply the absolute best consumer experience.
AngularJS Directives begins through investigating the easiest practices for single-page software improvement total earlier than diving into how AngularJS directives satisfy these objectives. At each one step, youll study either the how and why of what have been development, and through the top, youll not just recognize the proof essential to create a directive, yet you’ll even have the data to come to a decision how top to gather it.

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AngularJS Directives

AngularJS Directives serves as an in-depth learn of a few of the middle positive aspects of AngularJS and gives you with the entire wisdom you must create absolutely dynamic internet functions that reply in real-time to adjustments in facts. Youll how one can construct directives from the floor up in addition to the very best practices for architecting them.

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We've also requested access to that same function and passed it in via the msd-update-title attribute. Note, however, that we don't just ask for it by name. Instead, the attribute value actually calls the function with a set of variable and/or hard-coded parameters. Then, within our new scope, Angular creates a wrapper function that takes a map of the variable names and values (the {title : 'bob'} parameter in our example) and calls our original method within the context of the parent scope, passing in all mapped values and other hard-coded parameters.

This function gets called each time the directive is attached to a DOM element and can be used to attach plugins, retrieve additional data, and so on. Angular provides multiple ways to handle Dependency Injection, but two are the most common. In many examples, you'll see factory functions that look like function($scope, $http) { … }, which works because Angular will actually inspect the variable names to determine what providers it should use, then inject those into the function, so $scope gets populated with an instance of the current scope, and $http gets the singleton instance of Angular's $http library.

What we set aside, at that point, were controllers, which are also functions that execute as Angular applies a directive. In and of themselves, controllers don't provide significant advantages over local methods within the linking function of your directives. When paired with their ability to be shared across directives, however, controllers provide unparalleled communication between directives on the same node, or even just within the same ancestral tree. To get a better understanding of how these controllers can enable directives to work together, let's take a look at the ngModel and form controllers, which combine to provide much of the real-time data binding that powers Angular's dynamic content.

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