Dev Toolbar App API
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The Astro Dev Toolbar App API allows you to create apps that can be used to extend the Astro Dev Toolbar. This allows you to add new features and integrations with third-party services.
Adding apps
Astro Integrations can add apps in the astro:config:setup
hook using the addDevToolbarApp
method.
Structure of a Dev Toolbar App
A Dev Toolbar App is a .js
or .ts
file that default exports an object with the following required properties:
id: string
A unique identifier for the app. This will be used to uniquely identify the app in hooks and events.
name: string
The name of the app. This will be shown to users whenever the app needs to be referenced using a human-readable name.
icon: Icon
The icon of the app. This will be used to display the app in the UI. This can either be an icon from the icon list, or a string containing the SVG markup of the icon.
init: (canvas: ShadowRoot, eventTarget: EventTarget) => void
This is the core part of the app. This function will be called when the app is loaded, which will either be when the browser is idle or when the user clicks on the app in the UI.
The function receives two arguments:
canvas
A ShadowRoot that the app can use to render its UI. Every app receive its own dedicated ShadowRoot for rendering its UI. Additionally, the parent element is positioned using position: absolute;
and as such, the app UI automatically won’t affect the layout of the page.
eventTarget
An EventTarget
that can be used to send and receive events from the Dev Toolbar.
beforeTogglingOff
This optional function will be called when the user clicks on the app icon in the UI to toggle off the app. This function can be used, for example, to perform cleanup operations, do an animation, or to ask the user for confirmation before toggling off the app.
If a falsy value is returned, the toggling off will be cancelled and the app will stay enabled.
canvas
The ShadowRoot of the app, can be used to render any UI needed.
Client-side Events
Using the eventTarget
argument on the init
hook, apps can send and receive events from the Dev Toolbar. The following events are available:
app-toggled
This event is fired when the user clicks on the app icon in the Dev Toolbar.
state: boolean
Indicates whether or not the app is enabled after the user’s click.
toggle-notification
This event can be sent to inform the user that the app requires attention.
state: boolean
Indicates whether or not the app has a notification for the user. When true
, the app icon will be highlighted using a red dot. Conversely, when false
, the highlight will be removed. If this property is not specified, true
will be assumed.
toggle-app
This event can be sent from your app to change the state of your app. This can be useful, for instance, to implement a “Close” button in your app’s UI.
state: boolean
Indicates whether or not the app should be enabled. When true
, the app will be enabled. Conversely, when false
, the app will be disabled. If this property is not specified, true
will be assumed.
Client-Server Communication
Using Vite’s methods for client-server communication, Dev Toolbar Apps can communicate with the server.
In addition to being able to send and receive custom messages, the Dev Toolbar also sends the following messages, where APP_ID
is the app’s ID:
astro-dev-toolbar:APP_ID:initialized
This message is sent when the app is initialized. The data for this message is empty.
astro-dev-toolbar:APP_ID:toggled
This message is sent when the user clicks on the app icon in the UI. The data for this message is a boolean indicating whether the app is enabled or not.
The built-in connection
event from Vite fires before Dev Toolbar apps are initialized and therefore cannot be used directly by apps. Instead, use the astro-dev-toolbar:APP_ID:initialized
event.
UI Toolkit
The Dev Toolbar includes a set of web components that can be used to build apps with a consistent look and feel.
astro-dev-toolbar-window
Shows a window.
The slot of the component will be used as the content of the window.
When building a window using JavaScript, slotted content must go inside the light DOM of the component.
astro-dev-toolbar-button
Shows a button.
The slot of the component will be used as the content of the button.
size
The size of the button (small, medium, large).
button-style
The style of the button (ghost
, outline
, purple
, gray
, red
). When using ghost
, the button itself is invisible and only the content of the button will be shown.
In JavaScript, set this property using the buttonStyle
property to avoid conflict with the native style
property.
astro-dev-toolbar-badge
Shows a badge.
The slot of the component will be used as the content of the badge.
size
The size of the badge (small
, large
).
badge-style
The style (color) of the badge (purple
, gray
, red
, green
, yellow
).
In JavaScript, set this property using the buttonStyle
property to avoid conflict with the native style
property.
astro-dev-toolbar-card
Shows a card. Specify an optional link
attribute to make the card act like an <a>
element.
When making a card using using JavaScript, a clickAction
property can be specified to make the card act like a <button>
element.
The slot of the component will be used as the content of the card.
astro-dev-toolbar-toggle
Shows a toggle element, acting as a checkbox. This element internally is a simple wrapper around a native <input type="checkbox">
element. The checkbox element can be accessed using the input
property.
astro-dev-toolbar-highlight
Can be used to highlight an element on the page. In most cases, you’ll want to position and resize this element using the top
, left
, width
and height
CSS properties to match the element you want to highlight. An icon can also be specified using the icon
attribute and will be shown in the top right corner of the highlight.
astro-dev-toolbar-tooltip
Shows a tooltip with different sections. This component is set to display: none;
by default and can be made visible using a data-show="true"
attribute.
Sections are defined using the sections
property. This property is an array of objects with the following shape:
This component is often combined with the astro-dev-toolbar-highlight
component to show a tooltip when hovering a highlighted element:
astro-dev-toolbar-icon
Shows an icon. An icon from the icon list can be specified using the icon
attribute, or the SVG markup of an icon can be passed as a slot.
Icons
Currently, the following icons are available and can be used in any component that accepts an icon:
astro:logo
warning
arrow-down
bug
file-search
check-circle
gear
lightbulb
file-search
checkmark
dots-three
copy
All of the above icons have fill="currentColor"
set by default and will inherit their color from the parent element.