AngularJS directive ngShow not working properly

It seems like I'm encountering some scope issues that I can't seem to resolve. Here's a rundown of the problem:

I'm trying to create a custom directive called "my-create-content" that will insert an "img" HTML template into the element where the directive is used. I've added ng-show to the "img" tag and set up a timeout function to change ng-show to false after a certain duration. However, even after the timeout, the "img" element remains visible. I suspect there might be a scope problem, but the interpolation of ng-src="{{imageUrl}}" works correctly.

This is my current code snippet:

.directive('myCreateContent', [function() {

function link(scope, element, attrs) {

  scope.showImg = false;

  function updateImg(url){
    scope.imageUrl = url;
    scope.showImg = true;
  }

  if (scope.grid[0].image){
    updateImg(scope.grid[0].imageUrl);
    setTimeout(function(){
      scope.showImg = false;
    }, scope.grid[0].duration);
  }

}

return {
  scope: {
    grid: '='
  },
  template: '<img ng-show="showImg" ng-src="{{imageUrl}}" class="grid">',
  link: link
};
}]);

Here's how it looks in the HTML:

<div my-create-content grid="grid" class="container">

Answer №1

To ensure that AngularJS recognizes changes in scope variables, it is essential to invoke the $apply function.

Instead of relying on setTimeout, consider using $timeout as it handles the necessary updates automatically.

For further information, check out: $timeout service

Answer №2

To ensure that changes are properly digested and rendered, it is necessary to utilize the $timeout function.

While you could use $apply within a setTimeout, it is not the optimal choice as it may lead to potential JavaScript errors if AngularJS is already in the process of digesting.

Your code has been placed on jsfiddle for reference:

http://jsfiddle.net/g07stzdk/3/

Based on the nature of your code, it seems like you are working on a carousel. In this case, the appropriate function to use would be $interval, which serves as the AngularJS equivalent of setInterval in vanilla JavaScript.

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