When multiple directives are applied to an element in AngularJS, what determines the order in which they will be executed?
For instance:
<input ng-change='foo()' data-number-formatter></input>
Which directive, the number formatter or the change event, will be fired first? Is the execution sequence predictable?
The arrangement in which directives are processed is determined by their priority:
According to the information found in the documentation:
When multiple directives are applied to a single DOM element, it may be necessary to specify the sequence in which they should be executed. The priority attribute is utilized to order the directives before their compile functions are called. Priority is represented as a numeric value. Directives with higher numerical priority are handled first. Pre-link functions are also executed based on priority, while post-link functions run in reverse order. The relative order of directives with identical priorities remains unspecified. The default priority is set at 0.
The documentation explains:
When multiple directives are defined on a single DOM element, it may be necessary to specify the order in which they are applied. The priority determines the sequence in which the directives are compiled before their functions are called. Priority is assigned as a numerical value. Directives with higher priority numbers are compiled first. Pre-link functions are also executed based on priority, while post-link functions run in reversed priority order. The order of directives with the same priority remains undefined. The default priority is set at 0.
Additionally
Pre-linking function: Runs prior to linking child elements. It is not recommended for performing DOM manipulations since the compiler's linking process could encounter errors in locating the appropriate elements.
Post-linking function: Executes after all child elements have been linked. This is the suitable stage for making DOM transformations within the post-linking function.
(The focus here is on the execution of the directives, not the compilation process, so let's steer clear of the priority setting.)
If we consider the number-formatter directive operating within the typical $parsers/$formatters chain, it appears that the order is consistent – formatter/parser precedes ng-change. Even when employing
ng-model-options="{updateOn: 'change'}"To explore further, check out this fiddle: http://jsfiddle.net/4dtnvrbh/ (play around with different ng-model-options configurations and keep an eye on the console).
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