Tips on sending a DOM element to the "ng-disabled" directive

Hello everyone,

I am facing a challenge in passing the current DOM element to an Angular directive called "ng-disabled." While I understand that manipulating the DOM directly in Angular is not recommended, I am struggling to find a simpler solution for my issue. Here's what I'm dealing with:

There is a button in my application that updates a scope variable when clicked:

<button ng-click="target_model.display_detail=true">click me</button>

Elsewhere in the template, there is code that monitors the "target_model.display_detail" variable. When it becomes true, a modal dialog is displayed. This dialog contains an Angular directive fetching data from the server and populating a form which includes another similar button.

The data structure I am working with can be recursive, with multiple nested "target_models." Therefore, it is possible for a button within a modal dialog to reference a target_model whose form has already been created. In such cases, I simply want to disable the button. Ideally, I would like to achieve something like this:

<button ng-disabled="ancestor_model_exists(the_current_element, target_model.some_unique_id)">click me</button>

Here, "ancestor_model_exists" is a function designed to check the DOM for an ancestor element with a specific id. However, the challenge lies in determining which element to start from.

Answer №1

Approaching DOM manipulations imperatively, the jQuery way rather than declaratively, the Angular way.

It's acceptable to manipulate the DOM inside directives. However, refrain from doing so in controllers where you likely defined the function.

Challenge yourself by attempting to avoid using $ calls entirely within a sandbox environment. This will help you grasp the Angular way of doing things. It's prudent to first learn the toolkit and recommended approaches before venturing into your own methods.

Here's a solution that should meet your needs, with potential limitations when searching beyond multiple ancestors:

https://plnkr.co/edit/7O8UDuqsVTlH8r2GoxQu?p=preview

JavaScript

Insert customized JavaScript code here...

HTML

Insert customized HTML code here...

Answer №2

Isn't it interesting how posting a question on Stack Overflow can sometimes lead you to the answer yourself shortly after?

Here's a snippet of code that almost solves my issue:

template.html:

<button ng-click="display_if_ancestor_model_exists($event, target_model)">click me</button>

app.js:

$scope.display_if_ancestor_model_exists = function($event, target_model) {
  var ancestor_form = $($event.target).closest("#" + target_model.some_unique_id);
  if (ancestor_form.length) {
    /* Don't show the modal-dialog */
    display_msg("This form already exists!");
  }
  else {
    target_model.display_detail = true;
  }
};

Ideally, I would prefer the button to be disabled instead, but this solution will do for now.

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