Building Angular Components in a Single Instance

I am working on an angular webpage that showcases a list of items. Each item is displayed within a div through iteration. Below is the HTML code snippet for this functionality:

<div ng-repeat="item in items">
    <div class="item-title-section">
        <h1>{{item.text}}</h1>
    </div>
    <div class="item-special-section" 
            ng-show="item.type == 'FooB' ||
                    item.type == 'FooC' ||
                    item.type == 'FooD'">
        <div>
            <h2>Speical</h2>
            <p>Type Section</p>
        </div>
        <div>
            <span>{{item.text}}</span>
        </div>
    </div>
</div>

In the above code, the item-title-section is always visible. However, I only want the item-special-section to be displayed if the current item has the type B, C, or D. The issue arises when all three types are present in the list as the special section gets printed multiple times with each item's text. Is there a way in angular to ensure the creation of the html element only once?

Answer №1

After encountering this issue, I came up with a solution to handle the display of a specific special item by creating a separate function within the $scope. To exemplify my point, I have prepared a demonstration using a Plnkr Example.

HTML

<div class="item-special-section"
     ng-show="showSpecialSection(item.type)">
  <p>I'm a special case!</p>
  <p>{{item.text}}</p>
</div>

The HTML snippet specifically allows the element to display only if the showSpecialSection function returns true, which takes in the item.type.

JavaScript

// Define out specialItems
$scope.specialItems   = ['FooB', 'FooC', 'FooE'];

// Create an array to store the first item that meets the criteria in showSpecialSection
$scope.allowedItem    = [];

$scope.showSpecialSection = function(item) {
  // Check if the item is included in our list of special items
  if ($scope.specialItems.indexOf(item) != -1) {

    // Depending on whether allowedItem has any content,
    // we either add the item or verify its presence in allowedItem
    if ($scope.allowedItem.length == 0) {
      $scope.allowedItem.push(item);
      return true;
    }
    else if ($scope.allowedItem.indexOf(item) != -1) {
      return true;
    }
  }
  // Return false if all previous checks fail
  return false;
}

If you try this approach and encounter any issues, feel free to reach out. Best regards ~

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