For bindings that require more complicated operations, use Computed Properties instead.įor security reasons, in inline expressions you can only access properties and methods present on the current context Vue instance and its parents. To discourage the overuse of logic inside templates, Vue.js inline expressions are limited to one statement only. You should use expressions wisely and avoid putting too much logic in your templates, especially statements with side effects (with the exception of event listener expressions). Thanks to async batch updates, even when multiple dependencies change, an expression will only be updated once every event loop.
Vue.js automatically tracks the properties an expression depends on and refreshes the directive whenever a dependency changes. Here we are using a computed expression instead of a single property key.
VUE JS UPDATE
This directive instructs Vue.js to update the div’s textContent whenever the message property on the Vue instance changes. The directive ID is text and the expression is message. Here the prefix is v which is the default. A Vue.js directive can only appear in the form of a prefixed HTML attribute that takes the following format: 1 In Vue.js, the concept of directive is drastically simpler than that in Angular. Essentially, a directive is some special token in the markup that tells the library to do something to a DOM element. If you have not used AngularJS before, you probably don’t know what a directive is.
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