provide/inject ngidini komponen nenek-moyang nyedhiya data kanggo bisa turun mula-mula, ora perlu nglangkungi jero tenan, tanpa ngasilake props liwat saben komponen antarane. Mbubarake prop drilling.
App → Layout → Sidebar → Menu → MenuItem
Yen mung MenuItem sing perlu theme, nggawe iku minangka prop liwat Layout, Sidebar, lan Menu (sing ora duwe) iku merepotkan lan ribut. provide/inject lompat langsung.
<!-- App.vue -->
<script setup>
import { provide, ref } from "vue";
const theme = ref("dark");
provide("theme", theme); // make `theme` available to ALL descendants
provide("toggleTheme", () => { // can provide functions too
theme.value = theme.value === "dark" ? "light" : "dark";
});
</script>
<!-- MenuItem.vue (deeply nested) -->
<script setup>
import { inject } from "vue";
const theme = inject("theme"); // get it directly — no props in between
const toggleTheme = inject("toggleTheme");
const color = inject("color", "blue"); // with a default fallback
</script>
// ✅ provide a ref/reactive so descendants see updates
provide("theme", theme); // theme is a ref → reactive
// ❌ provide("theme", theme.value) → passes a snapshot, not reactive
Nyedhiya obyek reaktif (ref iku, ora .value iku) supaya nalika ganti, kabeh komponen sing nyikil kasil anyar.
import { themeKey } from "./keys"; // export const themeKey = Symbol()
provide(themeKey, theme); // avoids string-key collisions
provide/inject → pass data down a specific subtree (theme, form context, a service)
Pinia → global, app-wide shared state (user, cart) usable anywhere
Gunakake provide/inject kanggo injeksi gumantung ana ing sasubpohon; tangkap Pinia nalika negara bener-bener global utawa dibagiake mungsuh bagean sing ora ana hubungane.
provide/inject busak prop drilling kanggo data sing akeh komponen sing nggantung sambung (tema, lokal, formulir/konteks, layanan plugin).
Ngerti nyedhiya nilai reaktif (supaya anyaran nyebar), nganggo gawan/Symbol key, lan beda saka negara global (Pinia) matamu bisa nabyoni konteks sambung bersih liwat pohon komponen jero.