Is there a more "Angular-esque" approach to implementing this (inter-element communication)?

Question

Is there a more "Angular-esque" approach to implementing this (inter-element communication)?

I have created a custom directive that will automatically add an asterisk to the label of any input field marked as required. The following is my link function with detailed comments:

// This is what the DOM structure looks like:
// <label id="label-1" for="example-1">Name:</label>
// <input id="example-1" type="text" acc-required>

function (scope, element, attrs) {
    // The 'element' variable represents the input node
    // Using jQuery to select the corresponding label based on the ID attribute
    var label = $("label[for='" + element.attr('id') + "']");
    if (label) {
        // Adding an asterisk inside the label for required input fields
        var abbrElement = angular.element('<abbr title="required" class="required-marker"">*</abbr>');
        label.append(compile(abbrElement)(scope));
    }
}

Is it considered bad practice to target labels using the input's ID attribute?

javascript angularjs

Answer 1

Answer №1

To optimize DOM manipulation and reduce the need for ids, for, and jQuery, I recommend placing the directive on the label instead of the input:

<label acc-required>Name:</label>

app.directive('accRequired', function() {
   return {
      compile: function(element) {
         element.append('<abbr title="required" class="required-marker"">*</abbr>');
      }
   }
});

Update: Utilizing @stevuu's HTML example, here is a method to identify a label without using ids while keeping the directive on the form element:

<label>Name1:
    <input type="text" acc-required>
</label>

app.directive('accRequired', function() {
    return function(scope, element, attrs) {
        var label = element.parent();
        if(label) {
            element.before('<abbr title="required" class="required-marker">*</abbr>');
        }
    }
});

fiddle

It's important to note that $compile isn't necessary since the added HTML doesn't contain any directives.

In this case, I had to use jQuery as jqLite doesn't support before().

Answer 2

To optimize DOM manipulation and reduce the need for ids, for, and jQuery, I recommend placing the directive on the label instead of the input:

<label acc-required>Name:</label>

app.directive('accRequired', function() {
   return {
      compile: function(element) {
         element.append('<abbr title="required" class="required-marker"">*</abbr>');
      }
   }
});

Update: Utilizing @stevuu's HTML example, here is a method to identify a label without using ids while keeping the directive on the form element:

<label>Name1:
    <input type="text" acc-required>
</label>

app.directive('accRequired', function() {
    return function(scope, element, attrs) {
        var label = element.parent();
        if(label) {
            element.before('<abbr title="required" class="required-marker">*</abbr>');
        }
    }
});

fiddle

It's important to note that $compile isn't necessary since the added HTML doesn't contain any directives.

In this case, I had to use jQuery as jqLite doesn't support before().

Is there a more "Angular-esque" approach to implementing this (inter-element communication)?

Answer №1

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