tauri-syntax-webview

Quick Reference

Webview API Imports

Import	Purpose	Example
getCurrentWebview()	Get the current webview instance	const wv = getCurrentWebview()
getAllWebviews()	Get all webview instances	const all = await getAllWebviews()
Webview	Webview class for creation and reference	new Webview(window, 'label', opts)

Import path: import { Webview, getCurrentWebview, getAllWebviews } from '@tauri-apps/api/webview'

Webview Methods (TypeScript)

Method	Returns	Description
setZoom(factor)	Promise<void>	Set webview zoom level (1.0 = 100%)
clearAllBrowsingData()	Promise<void>	Clear all browsing data
size()	Promise<PhysicalSize>	Get webview size
position()	Promise<PhysicalPosition>	Get webview position
setSize(size)	Promise<void>	Set webview size
setPosition(pos)	Promise<void>	Set webview position
setAutoResize(enabled)	Promise<void>	Auto-resize with parent window
show()	Promise<void>	Show the webview
hide()	Promise<void>	Hide the webview
setFocus()	Promise<void>	Focus the webview
reparent(windowLabel)	Promise<void>	Move webview to another window
close()	Promise<void>	Close and destroy the webview
listen(event, handler)	Promise<UnlistenFn>	Listen for events on this webview
onDragDropEvent(handler)	Promise<UnlistenFn>	Listen for drag-drop events

Webview vs Window vs WebviewWindow

Concept	Description	Use When
Window	Native OS window container (title bar, frame)	Managing window chrome, position, visibility
Webview	Web content renderer inside a window	Multiple web panels in one window
WebviewWindow	Combined window + single webview (convenience)	Standard single-webview-per-window apps

Critical Warnings

NEVER create a Webview without specifying a parent Window -- webviews MUST live inside a window.

NEVER assume getCurrentWebview() and getCurrentWindow() return the same object -- a window can contain multiple webviews.

ALWAYS use LogicalSize / LogicalPosition from @tauri-apps/api/dpi for sizing and positioning to handle DPI scaling correctly.

ALWAYS call setAutoResize(true) when a webview should fill its parent window, otherwise the webview will NOT resize when the window resizes.

NEVER forget that reparent() takes a window label string, not a Window object.

---

Essential Patterns

Pattern 1: Getting the Current Webview

import { getCurrentWebview } from '@tauri-apps/api/webview';

const webview = getCurrentWebview();
console.log('Webview label:', webview.label);

Every webview has a unique label string identifier. The label is set at creation time and cannot be changed.

Pattern 2: Creating a Webview Inside an Existing Window

import { Webview } from '@tauri-apps/api/webview';
import { getCurrentWindow } from '@tauri-apps/api/window';

const parentWindow = getCurrentWindow();

const sidePanel = new Webview(parentWindow, 'side-panel', {
  url: 'https://example.com',
  x: 0,
  y: 0,
  width: 400,
  height: 300,
});

The constructor parameters are: parent window, unique label, and options with url, x, y, width, height.

Pattern 3: Multi-Webview Layout

import { Webview } from '@tauri-apps/api/webview';
import { getCurrentWindow } from '@tauri-apps/api/window';
import { LogicalSize, LogicalPosition } from '@tauri-apps/api/dpi';

const win = getCurrentWindow();

// Create a sidebar webview
const sidebar = new Webview(win, 'sidebar', {
  url: '/sidebar.html',
  x: 0,
  y: 0,
  width: 250,
  height: 600,
});

// Create a main content webview
const content = new Webview(win, 'content', {
  url: '/main.html',
  x: 250,
  y: 0,
  width: 550,
  height: 600,
});

Pattern 4: Webview Sizing and Positioning

import { getCurrentWebview } from '@tauri-apps/api/webview';
import { LogicalSize, LogicalPosition } from '@tauri-apps/api/dpi';

const webview = getCurrentWebview();

// Get current dimensions
const size = await webview.size();
const pos = await webview.position();

// Resize
await webview.setSize(new LogicalSize(400, 300));

// Reposition
await webview.setPosition(new LogicalPosition(100, 50));

// Auto-resize to fill parent window
await webview.setAutoResize(true);

Pattern 5: Reparenting a Webview

import { getCurrentWebview } from '@tauri-apps/api/webview';

const webview = getCurrentWebview();

// Move this webview to a different window by label
await webview.reparent('other-window');

Reparenting moves the webview from its current parent window to the window identified by the given label string.

Pattern 6: Zoom Control

import { getCurrentWebview } from '@tauri-apps/api/webview';

const webview = getCurrentWebview();

// Set zoom to 150%
await webview.setZoom(1.5);

// Reset to default
await webview.setZoom(1.0);

Pattern 7: Webview Events

import { getCurrentWebview } from '@tauri-apps/api/webview';

const webview = getCurrentWebview();

// Listen for custom events scoped to this webview
const unlisten = await webview.listen<string>('content-loaded', (event) => {
  console.log('Content loaded:', event.payload);
});

// Drag-drop events
const unlistenDrop = await webview.onDragDropEvent((event) => {
  if (event.payload.type === 'drop') {
    console.log('Files dropped:', event.payload.paths);
  }
});

// Clean up
unlisten();
unlistenDrop();

Pattern 8: Webview Events in React

import { useEffect } from 'react';
import { getCurrentWebview } from '@tauri-apps/api/webview';

function MyComponent() {
  useEffect(() => {
    const webview = getCurrentWebview();
    const promise = webview.onDragDropEvent((event) => {
      if (event.payload.type === 'drop') {
        console.log('Dropped:', event.payload.paths);
      }
    });

    return () => {
      promise.then((unlisten) => unlisten());
    };
  }, []);

  return <div>Drop files here</div>;
}

ALWAYS clean up webview event listeners in the component teardown to prevent memory leaks.

---

Rust Side: WebviewBuilder

For creating webviews from Rust, use WebviewBuilder:

use tauri::webview::WebviewBuilder;
use tauri::WebviewUrl;

// Inside setup() or any context with Manager access
let webview = WebviewBuilder::new(
    "side-panel",
    WebviewUrl::App("panel.html".into()),
)
.auto_resize()
.build()?;

// Attach to a window
window.add_child(
    webview,
    tauri::LogicalPosition::new(0.0, 0.0),
    tauri::LogicalSize::new(400.0, 600.0),
)?;

Rust WebviewWindowBuilder (Combined Window + Webview)

For the common case of one webview per window:

use tauri::webview::WebviewWindowBuilder;
use tauri::WebviewUrl;

let webview_window = WebviewWindowBuilder::new(
    app,
    "editor",
    WebviewUrl::App("editor.html".into()),
)
.title("Editor")
.inner_size(800.0, 600.0)
.build()?;

---

Drag-Drop Event Types

Event Type	Fields	Description
enter	paths: string[], position: PhysicalPosition	Files entered the webview area
over	position: PhysicalPosition	Files hovering over the webview
drop	paths: string[], position: PhysicalPosition	Files dropped on the webview
leave	--	Files left the webview area

Built-in TauriEvent constants for drag-drop:

Constant	Value
TauriEvent.DRAG_ENTER	"tauri://drag-enter"
TauriEvent.DRAG_OVER	"tauri://drag-over"
TauriEvent.DRAG_DROP	"tauri://drag-drop"
TauriEvent.DRAG_LEAVE	"tauri://drag-leave"

---

Permissions

Webview operations require core permissions in your capability file:

{
  "$schema": "../gen/schemas/desktop-schema.json",
  "identifier": "webview-capability",
  "windows": ["main"],
  "permissions": [
    "core:webview:default",
    "core:webview:allow-create-webview",
    "core:webview:allow-set-webview-size",
    "core:webview:allow-set-webview-position",
    "core:webview:allow-set-webview-zoom",
    "core:webview:allow-reparent",
    "core:webview:allow-webview-close"
  ]
}

ALWAYS add webview permissions to your capability file. Without them, all webview API calls throw "command not allowed" errors at runtime.

---

Reference Links

• references/methods.md -- Complete API signatures for Webview class, WebviewBuilder, and related types
• references/examples.md -- Working code examples for multi-webview layouts, drag-drop, and reparenting
• references/anti-patterns.md -- What NOT to do with webviews, with explanations

Official Sources

• https://v2.tauri.app/reference/javascript/api/namespacewebview/
• https://v2.tauri.app/reference/javascript/api/namespacedpi/
• https://docs.rs/tauri/latest/tauri/webview/index.html