Vue.js
Watchers in Vue.js
React to data changes with Vue watchers, including immediate and deep watching options.
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- Reactive Data Monitoring: Tracks changes to reactive properties (data, props, computed) and runs a callback.
- Immediate Execution: Runs the watcher callback immediately with
immediate: true. - Deep Watching: Monitors nested objects/arrays for changes with
deep: true. - Custom Callback Function: Executes a custom function with new/old values and
onCleanup(Vue 3). - Watching Multiple Sources: Observes multiple reactive sources (Vue 3) using an array.
- Flush Timing Control: Sets callback timing (
pre,post,sync) relative to DOM updates. - Watcher Lifecycle: Auto-cleans up when the component unmounts.
- Dynamic Watcher Creation: Programmatically creates watchers in Vue 3’s
setupor script setup. - Computed Property Watching: Observes computed properties for derived value changes.
- Error Handling: Handles errors in the callback using try-catch.
- Support for Reactive/Ref: Watches
reactiveobjects orrefvalues (Vue 3). - Once Watcher: Executes only once on the first change with
once: true(Vue 3).