Insert a DOM element during transclusion for all child elements except for the final one

I need to include an <hr> element between each instance of my transclude function, except for the last one.

The parent directive has a unique HTML template.
In this template, I utilize an Attribute directive to transclude the elements.

Example:

function transclusionDirective() {
    return {
        link: function (scope, element, attr, ctrl, transclude) {
            transclude(function (clone, scope) {
                element.append(clone);
            });
        }
    };
}

This directive assists me in manually managing transclusion.
Now, my task is to determine how to selectively add the <hr> element.
I assume that after the initial append, I can add something like element.append('<hr>');.

How can I ascertain the number of elements the transclude needs to append ?
Is there a $last value or any indication to identify the end of the loop?

Thank you for your assistance!

Answer №1

When the link function runs, the controller has already been created, so I recommend storing it in a controller attribute.

In the scenario below, I assume you are providing this directive with a collection to iterate through or specifying the number of elements to work with. I also assume that the argument is named collection and that you have utilized bindToController to make this binding accessible on the controller. Additionally, I presume you have added an attribute to your controller called iterationCount.

function directiveTransclude() {
    return {
        link: function (scope, element, attr, ctrl, transclude) {
            ctrl.iterationCount++;
            transclude(function (clone, scope) {
                element.append(clone);
                if(ctrl.iterationCount < (ctrl.collection.length - 1)) {
                  element.append('hr');
                }
            });
        }
    };
}

Alternatively, consider using CSS instead of adding <hr> tags if they are not necessary. Achieving the desired separation can be much simpler with a border and the last-child selector.

Answer №2

In case you were curious:

Even though it's late, I managed to find a solution using an alternative method (with CSS).

@Aaron Pool pointed out that I could use the last-child selector to achieve my desired outcome.

The last-of-type selector can be tricky, whereas the last-child selector is more straightforward as it applies directly to the last child element.

This approach is better in terms of speed without needing to manipulate the DOM and provides a safer visual layout, especially since <hr> elements are easily impacted by CSS rules.

I had previously attempted this technique but it didn't produce the expected results.
However, I recently discovered that the issue was with my LESS code:

&:last-child

Instead of

:last-child

So I had been focusing on the wrong DOM element all along, which was quite frustrating.
Despite feeling a bit foolish now, I am glad to have resolved the issue.
Wishing you all the best and a happy new year!

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