AngularJS Abstraction refers to the process of hiding complexity

While working with Angular, I couldn't help but notice how my HTML was getting cluttered with inline JS-like code.

For instance:

<table>
    <tr>
        <td ng-click="move('nw')" id="nw" ng-bind-template="{{northwest}}"></td>
        <td ng-click="move('n')" id="n" ng-bind-template="{{north}}"></td>
        <td ng-click="move('ne')" id="ne" ng-bind-template="{{northeast}}"></td>
    </tr>
    <tr>
        <td ng-click="move('w')" id="w" ng-bind-template="{{west}}"></td>
        <td ng-click="move('center')" id="center" ng-bind-template="{{center}}"></td>
        <td ng-click="move('e')" id="e" ng-bind-template="{{east}}"></td>
    </tr>
    <tr>
        <td ng-click="move('sw')" id="sw" ng-bind-template="{{southwest}}"></td>
        <td ng-click="move('s')" id="s" ng-bind-template="{{south}}"></td>
        <td ng-click="move('se')" id="se" ng-bind-template="{{southeast}}"></td>
    </tr>
</table>

It has been ingrained in me that JavaScript should be separated from HTML. I understand that Angular is unique and uses a lot of attribute-like methods, but is there a way to isolate my HTML and Angular, similar to how I would treat a DOM method?

For example:

var north = document.getElementById("n");
north["ng-click"] = function() { move(this.id); }

Answer №1

Sure, you could go ahead and do that. However, by doing so, you essentially defeat the purpose of using a declarative binding syntax.

Although it may seem like a hassle to remove any "garbage" in the HTML markup, it's actually quite simple to clean up. Imagine trying to do the same within your code - not as straightforward, right?

If you want to truly abstract your code, you'd have to create a universal wrapper that works with Angular, Knockout, and other binding libraries. Perhaps something like an HTML binding provider model.

While the idea sounds intriguing, ask yourself if it's worth investing your time in when you could simply stick with unobtrusive model binding instead. ;)

Answer №2

One of the downsides of using inline event handlers is that they often reference functions in the global namespace and combine structure with behavior.

  • Firstly, global namespace references can cause conflicts and make code harder to manage.
  • Secondly, mixing structure and behavior can make writing unit tests more difficult, as the code becomes tightly coupled.

However, in the case of Angular, these issues are somewhat mitigated. Inline handlers in Angular are tied to specific scopes rather than the global object, and Angular’s architecture allows for easy separation of concerns.

As the Angular team highlights in their "AngularJS" book, the framework’s design enables developers to write controllers with business logic that are independent of the DOM. This separation makes unit testing easier and more efficient, without the need to manipulate the DOM in tests.

Therefore, while using inline handlers in Angular may differ from traditional practices, they are not inherently bad in this context.

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