What is the reason for an ng-if directive causing the element's opacity to change to 0?

Question

What is the reason for an ng-if directive causing the element's opacity to change to 0?

Within my HTML, I have the following angular code:

<div ng-controller="DocTableCtrl as docTableCtrl" ng-init='docTableCtrl.init()'>
    {{docTableCtrl.skuArr.length > 0}}
    <div class="table-wrapper" ng-if="docTableCtrl.skuArr.length > 0">
            made it in
    </div>
</div>

No instance of "opacity" exists within the docTableCtrl object, so the issue is not related to that.

The problem I am encountering is as follows. Despite

docTableCtrl.skuArr.length > 0

displaying true, indicating that the ng-if should be showing the element, the style attribute in the DOM contains opacity: 0;. I cannot determine where this is originating from. When I remove the ng-if condition from the table-wrapper div, the opacity setting disappears and the content displays on the screen.

This perplexing situation suggests that somehow Angular is manipulating the div's opacity, although the reason for this behavior remains elusive.

What is causing the opacity to default to 0 only when the ng-if statement is applied to the table-wrapper div?

javascript html css angularjs

Answer 1

Answer №1

It is likely that a style rule has been specified somewhere, affecting the opacity. Upon inspecting the element, you should be able to identify the source of this style. In this case, it shows js:7 indicating that the style is being derived from the code editor. If it were coming from a stylesheet, it would display something like site.css:7

https://i.sstatic.net/b3L5e.png

angular.module('MyApp',[]).
  controller('DocTableCtrl',[function(){
    var docTableCtrl = this;
    
    docTableCtrl.skuArr = [];
    
    docTableCtrl.enqueue = function(){
      docTableCtrl.skuArr.push(""); 
     }
    docTableCtrl.dequeue = function(){
      docTableCtrl.skuArr.pop();
    }
  
  }]);

.table-wrapper{
    opacity:0;
  }

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="MyApp">
<div ng-controller="DocTableCtrl as docTableCtrl" ng-init='docTableCtrl.init()'>
     {{docTableCtrl.skuArr.length}}
    {{docTableCtrl.skuArr.length > 0}}
    <div class="table-wrapper" ng-if="docTableCtrl.skuArr.length > 0">
            made it in
    </div>
  <button ng-click="docTableCtrl.enqueue('')">Enqueue</button>
  <button ng-click="docTableCtrl.dequeue()">Dequeue</button>
</div>
</div>

Answer 2

It is likely that a style rule has been specified somewhere, affecting the opacity. Upon inspecting the element, you should be able to identify the source of this style. In this case, it shows js:7 indicating that the style is being derived from the code editor. If it were coming from a stylesheet, it would display something like site.css:7

https://i.sstatic.net/b3L5e.png

angular.module('MyApp',[]).
  controller('DocTableCtrl',[function(){
    var docTableCtrl = this;
    
    docTableCtrl.skuArr = [];
    
    docTableCtrl.enqueue = function(){
      docTableCtrl.skuArr.push(""); 
     }
    docTableCtrl.dequeue = function(){
      docTableCtrl.skuArr.pop();
    }
  
  }]);

.table-wrapper{
    opacity:0;
  }

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="MyApp">
<div ng-controller="DocTableCtrl as docTableCtrl" ng-init='docTableCtrl.init()'>
     {{docTableCtrl.skuArr.length}}
    {{docTableCtrl.skuArr.length > 0}}
    <div class="table-wrapper" ng-if="docTableCtrl.skuArr.length > 0">
            made it in
    </div>
  <button ng-click="docTableCtrl.enqueue('')">Enqueue</button>
  <button ng-click="docTableCtrl.dequeue()">Dequeue</button>
</div>
</div>

What is the reason for an ng-if directive causing the element's opacity to change to 0?

Answer №1

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