Combining inheritance and isolated scopes: a comprehensive guide

I've encountered a situation where I need to sort an HTML table. Here is the code snippet:

<table>
    <thead>
        <tr>
            <th custom-sort-one order="'Name'" >Name</th>               
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>Name_AAA</td>               
        </tr>           
    </tbody>
</table>

To tackle this, I decided to create a custom directive called customSortOne.

app.directive("customSortOne", function() {
  return {
    restrict: 'A',
    transclude: true,
    scope: {
      order: '='
    },
    template: '<a href="#" ng-click="sort_by(order)" style="color: #555555;"><span ng-transclude></span></a>',
    link: function(scope) {
      scope.sort_by = function(ColumnToSort) {
        console.log("ColumnToSort =", ColumnToSort);
        scope.TestFunction();
      };
    }
  }
});

The directive works when the user clicks on the Name column header, but there's an issue - it can't access the parent scope's function written in the controller.

To overcome this limitation, I modified my directive using inherited scope.

app.directive("customSortTwo", function() {
  return {
    restrict: 'A',
    transclude: true,
    scope: true,
    template: '<a href="#" ng-click="sort_by(order)" style="color: #555555;"><span ng-transclude></span></a>',
    link: function(scope) {
      scope.sort_by = function(ColumnToSort) {
        console.log("ColumnToSort =", ColumnToSort);
        scope.TestFunction();
      };
    }
  }
});

Now I can access the parent scope, but a new problem arises - I am unable to pass arguments to the sort_by function.

Plunker

Answer №1

If you need to make adjustments to your link function, it's quite simple.

The link function has several parameters such as scope, element, attributes, and more.

Therefore, all you have to do is access the value of the required attribute:

link: function (scope,elem, attrs) {
    scope.order = attrs.order; 

This method works for static attribute values, so quotation marks are not necessary in this case.
Check out the Updated Plunkr here

UPDATE: In regards to the first function: you are able to call a function from the parent scope by passing it like this:

<th custom-sort-one order="'Name'" func="TestFunction()" >Name</th> 

Then in the directive, make use of the & symbol

& or &attr - allows the execution of an expression within the parent scope context.

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