Download AngularJS Directives by Alex Vanston PDF

By Alex Vanston

AngularJS Directives serves as an in-depth examine of a few of the middle positive factors of AngularJS and offers you with the entire wisdom you must create totally dynamic net functions that reply in real-time to alterations in information. Youll the right way to construct directives from the floor up in addition to the superior practices for architecting them. by way of the top of this ebook, youll have the capacity to create an online software created from a number of modules all operating jointly seamlessly to supply the absolute best person experience.
AngularJS Directives begins by means of investigating the easiest practices for single-page software improvement total prior to diving into how AngularJS directives satisfy these ambitions. At every one step, youll research either the how and why of what have been construction, and through the top, youll not just recognize the evidence essential to create a directive, yet you’ll even have the information to come to a decision how top to gather it.

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The first is the template element, meaning it contains all the HTML within our DOM node, but again, this doesn't necessarily represent the instance of that element that's actually going to be inserted into our final document. The second property is similar to the $attrs object that was passed to our linking function in Chapter 3, Deconstructing Directives. It contains normalized access to each attribute on the DOM element. Remember, however, that we don't have an initialized scope here, so any of the attribute values that need to be evaluated within a scope won't have a useful value yet.

2 4 ] Chapter 3 Note, this is a bit of an over generalization, as it's simply inherited from it's parent prototypically, like all other JavaScript objects. name = “bob” on the child scope, the parent won't be touched. data. name = “bob”, it will be changed, as you're actually reading the “data” object first, then setting the value on that, and since that object is shared between parent and child, both will reflect the change. name = “bob” “data” Secondly, if you want to isolate your directive from the rest of your application, you can create an aptly named isolate scope.

In both cases, any time the return value changes or is first initialized, the function passed in to $watch as the second parameter is called. In our case here of ng-repeat, we're actually using the watcher function (first parameter) to perform all of the necessary changes, since it gets called every time Angular executes the $digest function. As a note, I wouldn't actually recommend this method unless you're confident it's necessary and you've extensively optimized your watcher function, as this can get called several times a second.

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