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feat(input, textarea, select): add section for start and end slots (#3271)
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‎docs/api/input.md

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:::
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## Start and End Slots (experimental)
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The `start` and `end` slots can be used to place icons, buttons, or prefix/suffix text on either side of the input.
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Note that this feature is considered experimental because it relies on a simulated version of [Web Component slots](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_templates_and_slots). As a result, the simulated behavior may not exactly match the native slot behavior.
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:::note
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In most cases, [Icon](./icon.md) components placed in these slots should have `aria-hidden="true"`. See the [Icon accessibility docs](https://ionicframework.com/docs/api/icon#accessibility) for more information.
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If slot content is meant to be interacted with, it should be wrapped in an interactive element such as a [Button](./button.md). This ensures that the content can be tabbed to.
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:::
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import StartEndSlots from '@site/static/usage/v7/input/start-end-slots/index.md';
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<StartEndSlots />
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## Theming
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### Colors

‎docs/api/select.md

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<InterfaceOptionsExample />
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## Start and End Slots
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The `start` and `end` slots can be used to place icons, buttons, or prefix/suffix text on either side of the select. If the slot content is clicked, the select will not open.
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:::note
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In most cases, [Icon](./icon.md) components placed in these slots should have `aria-hidden="true"`. See the [Icon accessibility docs](https://ionicframework.com/docs/api/icon#accessibility) for more information.
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If slot content is meant to be interacted with, it should be wrapped in an interactive element such as a [Button](./button.md). This ensures that the content can be tabbed to.
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:::
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import StartEndSlots from '@site/static/usage/v7/select/start-end-slots/index.md';
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<StartEndSlots />
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## Customization
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There are two units that make up the Select component and each need to be styled separately. The `ion-select` element is represented on the view by the selected value(s), or placeholder if there is none, and dropdown icon. The interface, which is defined in the [Interfaces](#interfaces) section above, is the dialog that opens when clicking on the `ion-select`. The interface contains all of the options defined by adding `ion-select-option` elements. The following sections will go over the differences between styling these.

‎docs/api/textarea.md

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<ClearOnEditPlayground />
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## Start and End Slots (experimental)
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The `start` and `end` slots can be used to place icons, buttons, or prefix/suffix text on either side of the textarea.
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Note that this feature is considered experimental because it relies on a simulated version of [Web Component slots](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_templates_and_slots). As a result, the simulated behavior may not exactly match the native slot behavior.
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:::note
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In most cases, [Icon](./icon.md) components placed in these slots should have `aria-hidden="true"`. See the [Icon accessibility docs](https://ionicframework.com/docs/api/icon#accessibility) for more information.
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If slot content is meant to be interacted with, it should be wrapped in an interactive element such as a [Button](./button.md). This ensures that the content can be tabbed to.
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:::
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import StartEndSlots from '@site/static/usage/v7/textarea/start-end-slots/index.md';
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<StartEndSlots />
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## Migrating from Legacy Textarea Syntax
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A simpler textarea syntax was introduced in Ionic 7.0. This new syntax reduces the boilerplate required to setup an textarea, resolves accessibility issues, and improves the developer experience.

‎static/usage/v7/input/start-end-slots/angular.md

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```html
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<ion-list>
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<ion-item>
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<ion-input labelPlacement="stacked" label="Email" placeholder="email@domain.com">
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<ion-icon slot="start" name="lock-closed" aria-hidden="true"></ion-icon>
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<ion-button fill="clear" slot="end" aria-label="Show/hide">
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<ion-icon slot="icon-only" name="eye" aria-hidden="true"></ion-icon>
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</ion-button>
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</ion-input>
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</ion-item>
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</ion-list>
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```

‎static/usage/v7/input/start-end-slots/demo.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Input</title>
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<link rel="stylesheet" href="../../../common.css" />
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<script src="../../../common.js"></script>
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<script type="module" src="https://cdn.jsdelivr.net/npm/@ionic/core@7/dist/ionic/ionic.esm.js"></script>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@ionic/core@7/css/ionic.bundle.css" />
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</head>
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<body>
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<ion-app>
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<ion-content>
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<div class="container">
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<ion-list>
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<ion-item>
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<ion-input label-placement="stacked" label="Email" placeholder="email@domain.com">
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<ion-icon slot="start" name="lock-closed" aria-hidden="true"></ion-icon>
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<ion-button fill="clear" slot="end" aria-label="Show/hide">
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<ion-icon slot="icon-only" name="eye" aria-hidden="true"></ion-icon>
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</ion-button>
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</ion-input>
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</ion-item>
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</ion-list>
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</div>
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</ion-content>
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</ion-app>
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</body>
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</html>

‎static/usage/v7/input/start-end-slots/index.md

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import Playground from '@site/src/components/global/Playground';
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import javascript from './javascript.md';
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import react from './react.md';
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import vue from './vue.md';
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import angular from './angular.md';
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<Playground
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version="7"
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code={{
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javascript,
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react,
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vue,
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angular,
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}}
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src="usage/v7/input/start-end-slots/demo.html"
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/>

‎static/usage/v7/input/start-end-slots/javascript.md

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```html
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<ion-list>
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<ion-item>
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<ion-input label-placement="stacked" label="Email" placeholder="email@domain.com">
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<ion-icon slot="start" name="lock-closed" aria-hidden="true"></ion-icon>
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<ion-button fill="clear" slot="end" aria-label="Show/hide">
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<ion-icon slot="icon-only" name="eye" aria-hidden="true"></ion-icon>
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</ion-button>
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</ion-input>
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</ion-item>
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</ion-list>
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```

‎static/usage/v7/input/start-end-slots/react.md

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```tsx
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import React from 'react';
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import { IonButton, IonIcon, IonInput, IonItem, IonList } from '@ionic/react';
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import { eye, lockClosed } from 'ionicons/icons';
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function Example() {
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return (
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<IonList>
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<IonItem>
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<IonInput labelPlacement="stacked" label="Email" placeholder="email@domain.com">
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<IonIcon slot="start" icon={lockClosed} aria-hidden="true"></IonIcon>
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<IonButton fill="clear" slot="end" aria-label="Show/hide">
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<IonIcon slot="icon-only" name={eye} aria-hidden="true"></IonIcon>
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</IonButton>
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</IonInput>
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</IonItem>
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</IonList>
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);
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}
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export default Example;
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```

‎static/usage/v7/input/start-end-slots/vue.md

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```html
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<template>
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<ion-list>
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<ion-item>
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<ion-input label-placement="stacked" label="Email" placeholder="email@domain.com">
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<ion-icon slot="start" :icon="lockClosed" aria-hidden="true"></ion-icon>
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<ion-button fill="clear" slot="end" aria-label="Show/hide">
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<ion-icon slot="icon-only" :icon="eye" aria-hidden="true"></ion-icon>
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</ion-button>
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</ion-input>
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</ion-item>
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</ion-list>
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</template>
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<script lang="ts">
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import { IonButton, IonIcon, IonInput, IonItem, IonList } from '@ionic/vue';
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import { eye, lockClosed } from 'ionicons/icons';
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import { defineComponent } from 'vue';
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export default defineComponent({
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components: {
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IonButton,
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IonIcon,
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IonInput,
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IonItem,
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IonList,
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},
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setup() {
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return { eye, lockClosed };
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},
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});
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</script>
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```

‎static/usage/v7/select/start-end-slots/angular.md

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```html
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<ion-list>
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<ion-item>
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<ion-select labelPlacement="stacked" label="Favorite fruit" value="apple">
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<ion-icon slot="start" name="leaf" aria-hidden="true"></ion-icon>
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<ion-select-option value="apple">Apple</ion-select-option>
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<ion-select-option value="banana">Banana</ion-select-option>
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<ion-select-option value="orange">Orange</ion-select-option>
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<ion-button fill="clear" slot="end" aria-label="Show/hide password">
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<ion-icon slot="icon-only" name="eye" aria-hidden="true"></ion-icon>
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</ion-button>
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</ion-select>
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</ion-item>
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</ion-list>
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```

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