AngularJS does not recognize a dynamically created array when using ng-include with ng-repeat

Issue with ng-repeat Directive

I have encountered a problem where the ng-repeat directive does not track the addition of a new array, specifically 'options'. This issue arises when the directive is used within a template displayed using ng-dialog from a third-party library. Oddly enough, if I close the dialog box and reopen it, the changes made before closing are picked up by ng-repeat.

Attempting to use $scope.$apply(); resulted in a warning stating that it was already running.

Solution ++

To overcome this obstacle, I implemented a solution where a function was added to the ng-init attribute to first check for the existence of the array. If the array did not exist, it was created and then assigned to the new variable.

Here's a more detailed example:
After creating this jsFiddle, I discovered that the issue lies within the ng-include/ng-repeat - without these components, everything works fine. http://jsfiddle.net/20mobk2h/56/
http://jsfiddle.net/20mobk2h/61/

The ng-repeat iterates over an array named options, which may or may not exist.

<div ng-init="options = element.options">
    <div ng-repeat="option in options" ng-include="'optionsTree'"></div>
</div>

To add a new option:

$scope.addItem = function(item) {

    if(!item.options){
        item.options = [];
    }

    var obj = {
        val: 'blah'
    };

    item.options.push(obj);
}

Answer №1

Revise this block of code:

<div ng-init="options = item.options">
    <div ng-repeat="option in options" ng-include="'nest_options'"></div>
</div>

into the following:

<div>
    <div ng-repeat="option in item.options" ng-include="'nest_options'"></div>
</div>

The issue arises when assigning item.options to a new variable called options, as it severs the reference with the original item object. This happens because initially, options is set to undefined when item.options holds no value. In JavaScript, primitive values are passed by value, leading to instances where modifications made to the options property (such as adding elements to an array) do not reflect on the original item.

Conversely, on subsequent popups, the item.options is already defined as an object (array), allowing the assignment options = item.options to create a proper object reference. This means that changes made to item.options will be mirrored in the item.

See the demonstration here: http://jsfiddle.net/20mobk2h/57/

Answer №2

$scope.$apply() is the key to solving your issue.

Consider using this enclosed wrapper for $scope.$apply()

$scope.safeApply = function(fn) {
  var phase = this.$root.$$phase;
  if(phase == '$apply' || phase == '$digest') {
    if(fn && (typeof(fn) === 'function')) {
      fn();
    }
  } else {
    this.$apply(fn);
  }
};

Just swap out $apply with safeApply wherever necessary

$scope.safeApply(function() {
  alert('Now I'm wrapped for protection!');
});

Make sure to pass it the required function. By following this method, you can ensure proper adherence to the apply-digest cycle and only execute the apply when permitted.

Adapted from this source

Answer №3

Would you be able to provide the complete code for your controller and the corresponding page? Make sure that you have properly specified ng-controller in both your page and routeProvider. If it is already specified in routeProvider, then remove it from the page.

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