Detect when a DOM node is removed?

Question

I am trying to write a directive which will ensure that only one of its elements will remain active at any given time.

Directive: showOnlyOne Description: attaches to a dom node and ensures that only one dom node with this directive attached can be visible at a time.
Usage:

<body>
<div id="one" show-only-one></div>

<section> 
<div id="two" show-only-one></div>
</section>
</body>

In this case, the one that would show would be "two"... Now imagine that due to an external event the section element gets a jqLite .remove() called on it. Now how do I detect that "two" has been removed and then reactivate "one" so it will be shown?

angular.module('SWS')
.directive('swsOnlyOne', ['$log', '$interval', function($log, $interval) {
  var billies = [];
  return function(scope, elem, attrs) {
    if (billies.length > 0) {
      _.each(billies, function(b) {
        b.css('visibility', 'hidden');
      });
    }
    elem[0].addEventListener('DOMNodeRemoved', function(ev) {
      // THIS DOM EVENT WILL NEVER FIRE...
      if ('hidden' != elem.css('visibility')) {
        billies.splice(billies.indexOf(elem), 1);
        billies[billies.length].css('visibility', 'visible');
      }
    }, false);

    billies.push(elem);
  };
}]);

Answer 1

The way you listen with angular (best practices) is with scope.on("$destroy", fn) https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$destroy

$scope.on("$destroy", function(event){
   // cleanup
});

// but can also be used on elements
elem.on("$destroy", function(event){
   // cleanup    
});

Detect when a DOM node is removed?

Question

1 answers

solution1
0 2014-09-20 16:24:32

Detect when a DOM node is removed?

Question

1 answers

solution1 0 2014-09-20 16:24:32

solution1
0 2014-09-20 16:24:32