SPLICE JAVASCRIPT INSTALL

Since Vue performs the getter/setter conversion process during instance initialization, a property must be present in the data object in order for Vue to convert it and make it reactive. Vue cannot detect property addition or deletion. The splice() method changes the contents of an array by removing or replacing. However, there are ways to circumvent them to preserve reactivity. You can use the JavaScript splice() method to remove selected items in an array. Later on when a dependency’s setter is triggered, it notifies the watcher, which in turn causes the component to re-render.ĭue to limitations in JavaScript, there are types of changes that Vue cannot detect.

SPLICE JAVASCRIPT INSTALL

One caveat is that browser consoles format getter/setters differently when converted data objects are logged, so you may want to install vue-devtools for a more inspection-friendly interface.Įvery component instance has a corresponding watcher instance, which records any properties “touched” during the component’s render as dependencies. The getter/setters are invisible to the user, but under the hood they enable Vue to perform dependency-tracking and change-notification when properties are accessed or modified. This is an ES5-only and un-shimmable feature, which is why Vue doesn’t support IE8 and below. When you pass a plain JavaScript object to a Vue instance as its data option, Vue will walk through all of its properties and convert them to getter/setters using fineProperty.

Watch a video explanation on Vue Mastery How Changes Are Tracked

Splice javascript