Here is my current code snippet:
<my-directive></my-directive>
I am trying to include a ternary operation within it like this:
{{ $scope.my-option ? 'YES' : 'NO' }}
Is it possible to achieve the desired result by adding an attribute to the directive like so:
<my-directive my-option></my-directive>
How should I approach this? Will the evaluation be correct once the attribute is present? The attribute has already been bound using the = sign.
When checking for variables in AngularJS directives, remember to use camelCase instead of snake_case. For example, instead of $scope.my-option, you should use $scope.myOption.
CamelCased attributes should be referenced using camelCase in JavaScript source code as well.
Here is an example of how your HTML tag and AngularJS expression should look:
<my-directive my-option></my-directive>
{{ $scope.myOption ? 'YES' : 'NO' }}
In some cases, you may not even need to include the $scope variable, simplifying the expression to:
{{ myOption ? 'YES' : 'NO' }}
If you prefer not to add the check as a watcher in your HTML code, you can utilize the link function of your directive. The AngularJS documentation provides more information on this topic.
Here is an example of how you can implement this in your directive:
angular
.module('myModule')
.directive('myDirective', function() {
return {
restrict: 'A',
scope: {
myOption: '=?'
},
link: function(scope, element) {
if (scope.myOption) {
// You have the attribute
} else {
// You don't
}
}
}
});
If you find yourself without an isolated scope (and this method also works with an isolated scope), you can directly check the attributes:
angular
.module('myModule')
.directive('myDirective', function($parse) {
return {
restrict: 'A',
link: function(scope, element, attrs) {
var option;
if (attrs.hasOwnProperty('myOption')) {
// If the attribute is a plain string
option = attrs.myOption;
// Or parse it from a scoped property
option = $parse(attrs.myOption)(scope);
}
}
}
});
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