AngularJS Directives by Alex Vanston

By Alex Vanston

AngularJS Directives serves as an in-depth learn of a few of the middle beneficial properties of AngularJS and gives you with the entire wisdom you must create totally dynamic net purposes that reply in real-time to alterations in information. Youll the best way to construct directives from the floor up in addition to the very best practices for architecting them. via the top of this publication, youll be capable to create an internet program produced from a number of modules all operating jointly seamlessly to supply the absolute best person experience.
AngularJS Directives starts off by means of investigating the easiest practices for single-page program improvement total prior to diving into how AngularJS directives satisfy these ambitions. At every one step, youll examine either the how and why of what have been construction, and through the top, youll not just comprehend the proof essential to create a directive, yet you’ll even have the data to make a decision how most sensible to gather it.

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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. 0 and our #appSubtitle will read Still an app. If, however, we click on the #bobApp button within our directive, our wrapper function, bound to updateTitle within our directive's scope will be called, the title variable within our msd-update-title value will be mapped to bob, and finally setAppTitle('bob','Updated by a directive') will be called within the parent scope.

Thirdly, it is important to realize that even though we've requested only read-only access for this attribute, it will still be dynamically updated when the parent scope changes. 0. Of course, as you can probably ascertain by the "read-only" nature of this access, the reverse is not true. If our user now clicks on our #setDirTitle button, #appTitle will remain unchanged, #directiveTitle will now read bob, and, most importantly, we've now severed the connection between the two values. 0’ } { title : ‘bob’ } Chapter 5 From this point forward, any updates to the parent scope's title property will be ignored by our directive, as we've overridden our original linked value with a new static value.

This type of scoping for a directive is by far the easiest to understand and operate within, as you still have read access to all of the parent scope's values, but it's less likely that you'll accidentally change the data in the rest of the application. For this reason, I usually recommend setting scope to true from the beginning, unless you have a strong reason to do otherwise. To help clarify the difference of this type of scoping, let's revisit our previous example. This time, the scope section of our definition object will be scope: true, but otherwise all of the code will remain the same.

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