8ad66c03d7
Issue number: resolves #29193
---------
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## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->
In an attempt to preserve backwards compatibility when adding
`autocapitalize` to Searchbar, we used `!` to indicate that the prop was
never undefined. The `autocapitalize` on `HTMLElement` expects this
value to be a string and never undefined.
For the purposes of the property on Searchbar, setting this prop to one
of the accepted values would constitute a breaking change because it
would override the default browser behavior (which we previously relied
upon). As a result, we used `!` to not set a default prop but inform
TypeScript that this prop is always defined. This unintentionally made
it so developers needed to define the `autocapitalize` property every
time which is not what we want.
## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->
- `autocapitalize` now defaults to the `'default'` keyword. This is an
internal keyword that is used to tell Ionic to **not** set the
`autocapitalize` attribute on the inner `input` element and instead rely
on the default browser behavior. This satisfies the `HTMLElement`
requirement that `autocapitalize` is never undefined. In Ionic 8 this
`'default'` value will be replaced with `'off'`.
[Typescript currently sets the `HTMLElement` `autocapitalize` type to
`string`](65812bf3ec/src/lib/dom.generated.d.ts (L10087))
which is why we can add a `'default'` keyword here. There is some risk
that if these type definitions change in the future that applications
may encounter errors. However, changing this on the TypeScript side
would itself be a breaking change. Additionally, we are moving away from
`'default'` in Ionic 8, so I think this is an acceptable amount of risk.
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
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2. Update the BREAKING.md file with the breaking change.
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## Other information
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screenshots of how the component looks before and after the change. -->
Dev build: `7.8.2-dev.11711027016.13b2a920`
Tested in a React starter app with Searchbar, and I verified this fix
works.
@ionic/core
Ionic is an open source App Development Framework that makes it easy to build top quality Native and Progressive Web Apps with web technologies.
The Ionic Core package contains the Web Components that make up the reusable UI building blocks of Ionic Framework. These components are designed to be used in traditional frontend view libraries/frameworks (such as Stencil, React, Angular, or Vue), or on their own through traditional JavaScript in the browser.
Features
- Tiny, highly optimized components built with Stencil
- Styling for both iOS and Material Design
- No build or compiling required
- Simply add the static files to any project
- Lazy-loaded components without configuration
- Asynchronous rendering
- Theming through CSS Variables
How to use
Vanilla HTML
Easiest way to start using Ionic Core is by adding a script tag to the CDN:
<script type="module" src="https://cdn.jsdelivr.net/npm/@ionic/core/dist/ionic/ionic.esm.js"></script>
<script nomodule src="https://cdn.jsdelivr.net/npm/@ionic/core/dist/ionic/ionic.js"></script>
<link href="https://cdn.jsdelivr.net/npm/@ionic/core/css/ionic.bundle.css" rel="stylesheet">
Any Ionic component added to the webpage will automatically load. This includes writing the component tag directly in HTML, or using JavaScript such as document.createElement('ion-toggle').
Additionally, within this package is a dist/ionic.js file and accompanying dist/ionic/ directory. These are the same files which are used by the CDN, and they're available in this package so they can be apart of an app's local development.
Framework Bindings
The @ionic/core package can be used in simple HTML, or by vanilla JavaScript without any framework at all. Ionic also has packages that make it easier to integrate Ionic into a framework's traditional ecosystem and patterns. (However, at the lowest-level framework bindings are still just using Ionic Core and Web Components).
Custom Elements Build
In addition to the default, self lazy-loading components built by Stencil, this package also comes with each component exported as a stand-alone custom element within @ionic/core/components. Each component extends HTMLElement, and does not lazy-load itself. Instead, this package is useful for projects already using a bundler such as Webpack or Rollup. While all components are available to be imported, the custom elements build also ensures bundlers only import what's used, and tree-shakes any unused components.
Below is an example of importing ion-badge, and initializing Ionic so it is able to correctly load the "mode", such as Material Design or iOS. Additionally, the initialize({...}) function can receive the Ionic config.
import { defineCustomElement } from "@ionic/core/components/ion-badge.js";
import { initialize } from "@ionic/core/components";
// Initializes the Ionic config and `mode` behavior
initialize();
// Defines the `ion-badge` web component
defineCustomElement();
Notice how we import from @ionic/core/components as opposed to @ionic/core. This helps bundlers pull in only the code that is needed.
The defineCustomElement function will automatically define the component as well as any child components that may be required.
For example, if you wanted to use ion-modal, you would do the following:
import { defineCustomElement } from "@ionic/core/components/ion-modal.js";
import { initialize } from "@ionic/core/components";
// Initializes the Ionic config and `mode` behavior
initialize();
// Defines the `ion-modal` and child `ion-backdrop` web components.
defineCustomElement();
The defineCustomElement function will define ion-modal, but it will also define ion-backdrop, which is a component that ion-modal uses internally.
Using Overlay Controllers
When using an overlay controller, developers will need to define the overlay component before it can be used. Below is an example of using modalController:
import { defineCustomElement } from '@ionic/core/components/ion-modal.js';
import { initialize, modalController } from '@ionic/core/components';
initialize();
defineCustomElement();
const showModal = async () => {
const modal = await modalController.create({ ... });
...
}
How to contribute
Check out the CONTRIBUTE guide