Exploring the Dynamics of AngularJS: Leveraging ng-repeat and ng-show

Recently, I came across this code snippet: 

<div class="map" ng-controller="DealerMarkerListCtrl">
    <a ng-click="showdetails=!showdetails" href="#/dealer/{{marker.id}}" class="marker" style="left:{{marker.left}}px;top:{{marker.top}}px" ng-repeat="marker in dealer"></a>
</div>

and also encountered this view: 

<div ng-show="showdetails" class="alldealermodal">    
    <div ng-view></div>
</div>

While the "ng-show" function worked seamlessly with a single link outside the ng-repeat loop, it seems to be causing issues within the loop.
The desired functionality is for the link to open an overlay, which should display the content within the ng-view. However, this does not seem to be happening as expected.

I'm puzzled about what might be missing here. Any insights or suggestions would be greatly appreciated!

javascriptangularjsrepeat

Answer №1

When utilizing ngRepeat, a new scope is created, causing the reference to showdetails outside of the ng-repeat to differ from the one being updated within the repeated ng-click.

To overcome this issue with the new scope(s), consider binding to an object property rather than a primitive type. More information on this can be found in this post.

For a demonstration, check out this fiddle which illustrates how to bind to details.show instead of showdetails using:

$scope.details = { show: true };

Answer №2

"What could I be overlooking?"

As mentioned by @Gloopy, it is possible that you were not aware of the fact that ng-repeat generates child scopes (one for each item). Having an understanding of how JavaScript prototypal inheritance functions is crucial as well, since each child scope inherits from the same parent scope through prototypical inheritance, impacting how JavaScript searches for (or creates) properties on scopes.

Keep in mind that several Angular built-in directives create child scopes such as ng-repeat, ng-include, ng-switch, ng-controller, and other directives (potentially). For a more in-depth explanation on how prototypal inheritance operates, why it presents challenges when attempting to bind to primitives, and its correlation with Angular scopes, check out here.

In addition to @Gloopy's suggestion, there are two alternative approaches worth considering:

  1. utilize $parent within the ng-repeat to bind to the parent scope property (instead of creating child scope properties):
    <a ng-click="$parent.showdetails=!$parent.showdetails" ...
  2. establish a method on the parent scope and invoke it, hence altering a parent scope property rather than child scope properties:
    <a ng-click="toggleDetails()" ...

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