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@vaadin/combo-box - npm Package Compare versions

Comparing version 24.4.0-rc1 to 24.5.0-alpha1

26

package.json
{
"name": "@vaadin/combo-box",
"version": "24.4.0-rc1",
"version": "24.5.0-alpha1",
"publishConfig": {

@@ -43,12 +43,12 @@ "access": "public"

"@polymer/polymer": "^3.0.0",
"@vaadin/a11y-base": "24.4.0-rc1",
"@vaadin/component-base": "24.4.0-rc1",
"@vaadin/field-base": "24.4.0-rc1",
"@vaadin/input-container": "24.4.0-rc1",
"@vaadin/item": "24.4.0-rc1",
"@vaadin/lit-renderer": "24.4.0-rc1",
"@vaadin/overlay": "24.4.0-rc1",
"@vaadin/vaadin-lumo-styles": "24.4.0-rc1",
"@vaadin/vaadin-material-styles": "24.4.0-rc1",
"@vaadin/vaadin-themable-mixin": "24.4.0-rc1"
"@vaadin/a11y-base": "24.5.0-alpha1",
"@vaadin/component-base": "24.5.0-alpha1",
"@vaadin/field-base": "24.5.0-alpha1",
"@vaadin/input-container": "24.5.0-alpha1",
"@vaadin/item": "24.5.0-alpha1",
"@vaadin/lit-renderer": "24.5.0-alpha1",
"@vaadin/overlay": "24.5.0-alpha1",
"@vaadin/vaadin-lumo-styles": "24.5.0-alpha1",
"@vaadin/vaadin-material-styles": "24.5.0-alpha1",
"@vaadin/vaadin-themable-mixin": "24.5.0-alpha1"
},

@@ -58,3 +58,3 @@ "devDependencies": {

"@vaadin/testing-helpers": "^0.6.0",
"@vaadin/text-field": "24.4.0-rc1",
"@vaadin/text-field": "24.5.0-alpha1",
"lit": "^3.0.0",

@@ -67,3 +67,3 @@ "sinon": "^13.0.2"

],
"gitHead": "a81e3b927d44c56613fa4e1307494a2acc81005f"
"gitHead": "57806caac5468532a3b4e3dbdda730cd0fca193a"
}

2

src/vaadin-combo-box-data-provider-mixin.js

@@ -264,4 +264,2 @@ /**

throw new Error('Using `items` and `dataProvider` together is not supported');
} else if (this.dataProvider && !this.filteredItems) {
this.filteredItems = [];
}

@@ -268,0 +266,0 @@ }

8

src/vaadin-combo-box-mixin.d.ts

@@ -68,2 +68,10 @@ /**

/**
* A function used to generate CSS class names for dropdown
* items based on the item. The return value should be the
* generated class name as a string, or multiple class names
* separated by whitespace characters.
*/
itemClassNameGenerator: (item: TItem) => string;
/**
* If `true`, the user can input a value that is not present in the items list.

@@ -70,0 +78,0 @@ * `value` property will be set to the input value in this case.

26

src/vaadin-combo-box-mixin.js

@@ -200,2 +200,12 @@ /**

/**
* A function used to generate CSS class names for dropdown
* items based on the item. The return value should be the
* generated class name as a string, or multiple class names
* separated by whitespace characters.
*/
itemClassNameGenerator: {
type: Object,
},
/**
* Path for label of the item. If `items` is an array of objects, the

@@ -291,3 +301,3 @@ * `itemLabelPath` is used to fetch the displayed string label for each

'_openedOrItemsChanged(opened, _dropdownItems, loading, __keepOverlayOpened)',
'_updateScroller(_scroller, _dropdownItems, opened, loading, selectedItem, itemIdPath, _focusedIndex, renderer, _theme)',
'_updateScroller(_scroller, _dropdownItems, opened, loading, selectedItem, itemIdPath, _focusedIndex, renderer, _theme, itemClassNameGenerator)',
];

@@ -508,3 +518,14 @@ }

// eslint-disable-next-line max-params
_updateScroller(scroller, items, opened, loading, selectedItem, itemIdPath, focusedIndex, renderer, theme) {
_updateScroller(
scroller,
items,
opened,
loading,
selectedItem,
itemIdPath,
focusedIndex,
renderer,
theme,
itemClassNameGenerator,
) {
if (scroller) {

@@ -525,2 +546,3 @@ if (opened) {

theme,
itemClassNameGenerator,
});

@@ -527,0 +549,0 @@

24

src/vaadin-combo-box-scroller-mixin.js

@@ -67,2 +67,13 @@ /**

/**
* A function used to generate CSS class names for dropdown
* items based on the item. The return value should be the
* generated class name as a string, or multiple class names
* separated by whitespace characters.
*/
itemClassNameGenerator: {
type: Object,
observer: '__itemClassNameGeneratorChanged',
},
/**
* Path for the id of the item, used to detect whether the item is selected.

@@ -259,2 +270,9 @@ */

/** @private */
__itemClassNameGeneratorChanged(generator, oldGenerator) {
if (generator || oldGenerator) {
this.requestContentUpdate();
}
}
/** @private */
__focusedIndexChanged(index, oldIndex) {

@@ -310,2 +328,8 @@ if (index !== oldIndex) {

if (typeof this.itemClassNameGenerator === 'function') {
el.className = this.itemClassNameGenerator(item);
} else if (el.className !== '') {
el.className = '';
}
// NOTE: in PolylitMixin, setProperties() waits for `hasUpdated` to be set.

@@ -312,0 +336,0 @@ // However, this causes issues with virtualizer. So we enforce sync update.

26

web-types.json
{
"$schema": "https://json.schemastore.org/web-types",
"name": "@vaadin/combo-box",
"version": "24.4.0-rc1",
"version": "24.5.0-alpha1",
"description-markup": "markdown",

@@ -379,2 +379,13 @@ "contributions": {

{
"name": "itemClassNameGenerator",
"description": "A function used to generate CSS class names for dropdown\nitems based on the item. The return value should be the\ngenerated class name as a string, or multiple class names\nseparated by whitespace characters.",
"value": {
"type": [
"Object",
"null",
"undefined"
]
}
},
{
"name": "itemLabelPath",

@@ -464,3 +475,3 @@ "description": "Path for label of the item. If `items` is an array of objects, the\n`itemLabelPath` is used to fetch the displayed string label for each\nitem.\n\nThe item label is also used for matching items when processing user\ninput, i.e., for filtering and selecting items.",

"name": "vaadin-combo-box",
"description": "`<vaadin-combo-box>` is a web component for choosing a value from a filterable list of options\npresented in a dropdown overlay. The options can be provided as a list of strings or objects\nby setting [`items`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-combo-box#property-items) property on the element.\n\n```html\n<vaadin-combo-box id=\"combo-box\"></vaadin-combo-box>\n```\n```js\ndocument.querySelector('#combo-box').items = ['apple', 'orange', 'banana'];\n```\n\nWhen the selected `value` is changed, a `value-changed` event is triggered.\n\n### Item rendering\n\nTo customize the content of the `<vaadin-combo-box-item>` elements placed in the dropdown, use\n[`renderer`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-combo-box#property-renderer) property which accepts a function.\nThe renderer function is called with `root`, `comboBox`, and `model` as arguments.\n\nGenerate DOM content by using `model` object properties if needed, and append it to the `root`\nelement. The `comboBox` reference is provided to access the combo-box element state. Do not\nset combo-box properties in a `renderer` function.\n\n```js\nconst comboBox = document.querySelector('#combo-box');\ncomboBox.items = [{'label': 'Hydrogen', 'value': 'H'}];\ncomboBox.renderer = (root, comboBox, model) => {\n const item = model.item;\n root.innerHTML = `${model.index}: ${item.label} <b>${item.value}</b>`;\n};\n```\n\nRenderer is called on the opening of the combo-box and each time the related model is updated.\nBefore creating new content, it is recommended to check if there is already an existing DOM\nelement in `root` from a previous renderer call for reusing it. Even though combo-box uses\ninfinite scrolling, reducing DOM operations might improve performance.\n\nThe following properties are available in the `model` argument:\n\nProperty | Type | Description\n-----------|------------------|-------------\n`index` | Number | Index of the item in the `items` array\n`item` | String or Object | The item reference\n`selected` | Boolean | True when item is selected\n`focused` | Boolean | True when item is focused\n\n### Lazy Loading with Function Data Provider\n\nIn addition to assigning an array to the items property, you can alternatively use the\n[`dataProvider`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-combo-box#property-dataProvider) function property.\nThe `<vaadin-combo-box>` calls this function lazily, only when it needs more data\nto be displayed.\n\n__Note that when using function data providers, the total number of items\nneeds to be set manually. The total number of items can be returned\nin the second argument of the data provider callback:__\n\n```js\ncomboBox.dataProvider = async (params, callback) => {\n const API = 'https://demo.vaadin.com/demo-data/1.0/filtered-countries';\n const { filter, page, pageSize } = params;\n const index = page * pageSize;\n\n const res = await fetch(`${API}?index=${index}&count=${pageSize}&filter=${filter}`);\n if (res.ok) {\n const { result, size } = await res.json();\n callback(result, size);\n }\n};\n```\n\n### Styling\n\nThe following custom properties are available for styling:\n\nCustom property | Description | Default\n----------------------------------------|----------------------------|---------\n`--vaadin-field-default-width` | Default width of the field | `12em`\n`--vaadin-combo-box-overlay-width` | Width of the overlay | `auto`\n`--vaadin-combo-box-overlay-max-height` | Max height of the overlay | `65vh`\n\n`<vaadin-combo-box>` provides the same set of shadow DOM parts and state attributes as `<vaadin-text-field>`.\nSee [`<vaadin-text-field>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-text-field) for the styling documentation.\n\nIn addition to `<vaadin-text-field>` parts, the following parts are available for theming:\n\nPart name | Description\n----------------|----------------\n`toggle-button` | The toggle button\n\nIn addition to `<vaadin-text-field>` state attributes, the following state attributes are available for theming:\n\nAttribute | Description | Part name\n----------|-------------|------------\n`opened` | Set when the combo box dropdown is open | :host\n`loading` | Set when new items are expected | :host\n\nIf you want to replace the default `<input>` and its container with a custom implementation to get full control\nover the input field, consider using the [`<vaadin-combo-box-light>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-combo-box-light) element.\n\n### Internal components\n\nIn addition to `<vaadin-combo-box>` itself, the following internal\ncomponents are themable:\n\n- `<vaadin-combo-box-overlay>` - has the same API as [`<vaadin-overlay>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-overlay).\n- `<vaadin-combo-box-item>` - has the same API as [`<vaadin-item>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-item).\n- [`<vaadin-input-container>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-input-container) - an internal element wrapping the input.\n\nNote: the `theme` attribute value set on `<vaadin-combo-box>` is\npropagated to the internal components listed above.\n\nSee [Styling Components](https://vaadin.com/docs/latest/styling/styling-components) documentation.",
"description": "`<vaadin-combo-box>` is a web component for choosing a value from a filterable list of options\npresented in a dropdown overlay. The options can be provided as a list of strings or objects\nby setting [`items`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-combo-box#property-items) property on the element.\n\n```html\n<vaadin-combo-box id=\"combo-box\"></vaadin-combo-box>\n```\n```js\ndocument.querySelector('#combo-box').items = ['apple', 'orange', 'banana'];\n```\n\nWhen the selected `value` is changed, a `value-changed` event is triggered.\n\n### Item rendering\n\nTo customize the content of the `<vaadin-combo-box-item>` elements placed in the dropdown, use\n[`renderer`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-combo-box#property-renderer) property which accepts a function.\nThe renderer function is called with `root`, `comboBox`, and `model` as arguments.\n\nGenerate DOM content by using `model` object properties if needed, and append it to the `root`\nelement. The `comboBox` reference is provided to access the combo-box element state. Do not\nset combo-box properties in a `renderer` function.\n\n```js\nconst comboBox = document.querySelector('#combo-box');\ncomboBox.items = [{'label': 'Hydrogen', 'value': 'H'}];\ncomboBox.renderer = (root, comboBox, model) => {\n const item = model.item;\n root.innerHTML = `${model.index}: ${item.label} <b>${item.value}</b>`;\n};\n```\n\nRenderer is called on the opening of the combo-box and each time the related model is updated.\nBefore creating new content, it is recommended to check if there is already an existing DOM\nelement in `root` from a previous renderer call for reusing it. Even though combo-box uses\ninfinite scrolling, reducing DOM operations might improve performance.\n\nThe following properties are available in the `model` argument:\n\nProperty | Type | Description\n-----------|------------------|-------------\n`index` | Number | Index of the item in the `items` array\n`item` | String or Object | The item reference\n`selected` | Boolean | True when item is selected\n`focused` | Boolean | True when item is focused\n\n### Lazy Loading with Function Data Provider\n\nIn addition to assigning an array to the items property, you can alternatively use the\n[`dataProvider`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-combo-box#property-dataProvider) function property.\nThe `<vaadin-combo-box>` calls this function lazily, only when it needs more data\nto be displayed.\n\n__Note that when using function data providers, the total number of items\nneeds to be set manually. The total number of items can be returned\nin the second argument of the data provider callback:__\n\n```js\ncomboBox.dataProvider = async (params, callback) => {\n const API = 'https://demo.vaadin.com/demo-data/1.0/filtered-countries';\n const { filter, page, pageSize } = params;\n const index = page * pageSize;\n\n const res = await fetch(`${API}?index=${index}&count=${pageSize}&filter=${filter}`);\n if (res.ok) {\n const { result, size } = await res.json();\n callback(result, size);\n }\n};\n```\n\n### Styling\n\nThe following custom properties are available for styling:\n\nCustom property | Description | Default\n----------------------------------------|----------------------------|---------\n`--vaadin-field-default-width` | Default width of the field | `12em`\n`--vaadin-combo-box-overlay-width` | Width of the overlay | `auto`\n`--vaadin-combo-box-overlay-max-height` | Max height of the overlay | `65vh`\n\n`<vaadin-combo-box>` provides the same set of shadow DOM parts and state attributes as `<vaadin-text-field>`.\nSee [`<vaadin-text-field>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-text-field) for the styling documentation.\n\nIn addition to `<vaadin-text-field>` parts, the following parts are available for theming:\n\nPart name | Description\n----------------|----------------\n`toggle-button` | The toggle button\n\nIn addition to `<vaadin-text-field>` state attributes, the following state attributes are available for theming:\n\nAttribute | Description | Part name\n----------|-------------|------------\n`opened` | Set when the combo box dropdown is open | :host\n`loading` | Set when new items are expected | :host\n\nIf you want to replace the default `<input>` and its container with a custom implementation to get full control\nover the input field, consider using the [`<vaadin-combo-box-light>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-combo-box-light) element.\n\n### Internal components\n\nIn addition to `<vaadin-combo-box>` itself, the following internal\ncomponents are themable:\n\n- `<vaadin-combo-box-overlay>` - has the same API as [`<vaadin-overlay>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-overlay).\n- `<vaadin-combo-box-item>` - has the same API as [`<vaadin-item>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-item).\n- [`<vaadin-input-container>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-input-container) - an internal element wrapping the input.\n\nNote: the `theme` attribute value set on `<vaadin-combo-box>` is\npropagated to the internal components listed above.\n\nSee [Styling Components](https://vaadin.com/docs/latest/styling/styling-components) documentation.",
"attributes": [

@@ -1110,2 +1121,13 @@ {

{
"name": "itemClassNameGenerator",
"description": "A function used to generate CSS class names for dropdown\nitems based on the item. The return value should be the\ngenerated class name as a string, or multiple class names\nseparated by whitespace characters.",
"value": {
"type": [
"Object",
"null",
"undefined"
]
}
},
{
"name": "itemLabelPath",

@@ -1112,0 +1134,0 @@ "description": "Path for label of the item. If `items` is an array of objects, the\n`itemLabelPath` is used to fetch the displayed string label for each\nitem.\n\nThe item label is also used for matching items when processing user\ninput, i.e., for filtering and selecting items.",

18

web-types.lit.json
{
"$schema": "https://json.schemastore.org/web-types",
"name": "@vaadin/combo-box",
"version": "24.4.0-rc1",
"version": "24.5.0-alpha1",
"description-markup": "markdown",

@@ -149,2 +149,9 @@ "framework": "lit",

{
"name": ".itemClassNameGenerator",
"description": "A function used to generate CSS class names for dropdown\nitems based on the item. The return value should be the\ngenerated class name as a string, or multiple class names\nseparated by whitespace characters.",
"value": {
"kind": "expression"
}
},
{
"name": ".itemLabelPath",

@@ -251,3 +258,3 @@ "description": "Path for label of the item. If `items` is an array of objects, the\n`itemLabelPath` is used to fetch the displayed string label for each\nitem.\n\nThe item label is also used for matching items when processing user\ninput, i.e., for filtering and selecting items.",

"name": "vaadin-combo-box",
"description": "`<vaadin-combo-box>` is a web component for choosing a value from a filterable list of options\npresented in a dropdown overlay. The options can be provided as a list of strings or objects\nby setting [`items`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-combo-box#property-items) property on the element.\n\n```html\n<vaadin-combo-box id=\"combo-box\"></vaadin-combo-box>\n```\n```js\ndocument.querySelector('#combo-box').items = ['apple', 'orange', 'banana'];\n```\n\nWhen the selected `value` is changed, a `value-changed` event is triggered.\n\n### Item rendering\n\nTo customize the content of the `<vaadin-combo-box-item>` elements placed in the dropdown, use\n[`renderer`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-combo-box#property-renderer) property which accepts a function.\nThe renderer function is called with `root`, `comboBox`, and `model` as arguments.\n\nGenerate DOM content by using `model` object properties if needed, and append it to the `root`\nelement. The `comboBox` reference is provided to access the combo-box element state. Do not\nset combo-box properties in a `renderer` function.\n\n```js\nconst comboBox = document.querySelector('#combo-box');\ncomboBox.items = [{'label': 'Hydrogen', 'value': 'H'}];\ncomboBox.renderer = (root, comboBox, model) => {\n const item = model.item;\n root.innerHTML = `${model.index}: ${item.label} <b>${item.value}</b>`;\n};\n```\n\nRenderer is called on the opening of the combo-box and each time the related model is updated.\nBefore creating new content, it is recommended to check if there is already an existing DOM\nelement in `root` from a previous renderer call for reusing it. Even though combo-box uses\ninfinite scrolling, reducing DOM operations might improve performance.\n\nThe following properties are available in the `model` argument:\n\nProperty | Type | Description\n-----------|------------------|-------------\n`index` | Number | Index of the item in the `items` array\n`item` | String or Object | The item reference\n`selected` | Boolean | True when item is selected\n`focused` | Boolean | True when item is focused\n\n### Lazy Loading with Function Data Provider\n\nIn addition to assigning an array to the items property, you can alternatively use the\n[`dataProvider`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-combo-box#property-dataProvider) function property.\nThe `<vaadin-combo-box>` calls this function lazily, only when it needs more data\nto be displayed.\n\n__Note that when using function data providers, the total number of items\nneeds to be set manually. The total number of items can be returned\nin the second argument of the data provider callback:__\n\n```js\ncomboBox.dataProvider = async (params, callback) => {\n const API = 'https://demo.vaadin.com/demo-data/1.0/filtered-countries';\n const { filter, page, pageSize } = params;\n const index = page * pageSize;\n\n const res = await fetch(`${API}?index=${index}&count=${pageSize}&filter=${filter}`);\n if (res.ok) {\n const { result, size } = await res.json();\n callback(result, size);\n }\n};\n```\n\n### Styling\n\nThe following custom properties are available for styling:\n\nCustom property | Description | Default\n----------------------------------------|----------------------------|---------\n`--vaadin-field-default-width` | Default width of the field | `12em`\n`--vaadin-combo-box-overlay-width` | Width of the overlay | `auto`\n`--vaadin-combo-box-overlay-max-height` | Max height of the overlay | `65vh`\n\n`<vaadin-combo-box>` provides the same set of shadow DOM parts and state attributes as `<vaadin-text-field>`.\nSee [`<vaadin-text-field>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-text-field) for the styling documentation.\n\nIn addition to `<vaadin-text-field>` parts, the following parts are available for theming:\n\nPart name | Description\n----------------|----------------\n`toggle-button` | The toggle button\n\nIn addition to `<vaadin-text-field>` state attributes, the following state attributes are available for theming:\n\nAttribute | Description | Part name\n----------|-------------|------------\n`opened` | Set when the combo box dropdown is open | :host\n`loading` | Set when new items are expected | :host\n\nIf you want to replace the default `<input>` and its container with a custom implementation to get full control\nover the input field, consider using the [`<vaadin-combo-box-light>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-combo-box-light) element.\n\n### Internal components\n\nIn addition to `<vaadin-combo-box>` itself, the following internal\ncomponents are themable:\n\n- `<vaadin-combo-box-overlay>` - has the same API as [`<vaadin-overlay>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-overlay).\n- `<vaadin-combo-box-item>` - has the same API as [`<vaadin-item>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-item).\n- [`<vaadin-input-container>`](https://cdn.vaadin.com/vaadin-web-components/24.4.0-rc1/#/elements/vaadin-input-container) - an internal element wrapping the input.\n\nNote: the `theme` attribute value set on `<vaadin-combo-box>` is\npropagated to the internal components listed above.\n\nSee [Styling Components](https://vaadin.com/docs/latest/styling/styling-components) documentation.",
"description": "`<vaadin-combo-box>` is a web component for choosing a value from a filterable list of options\npresented in a dropdown overlay. The options can be provided as a list of strings or objects\nby setting [`items`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-combo-box#property-items) property on the element.\n\n```html\n<vaadin-combo-box id=\"combo-box\"></vaadin-combo-box>\n```\n```js\ndocument.querySelector('#combo-box').items = ['apple', 'orange', 'banana'];\n```\n\nWhen the selected `value` is changed, a `value-changed` event is triggered.\n\n### Item rendering\n\nTo customize the content of the `<vaadin-combo-box-item>` elements placed in the dropdown, use\n[`renderer`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-combo-box#property-renderer) property which accepts a function.\nThe renderer function is called with `root`, `comboBox`, and `model` as arguments.\n\nGenerate DOM content by using `model` object properties if needed, and append it to the `root`\nelement. The `comboBox` reference is provided to access the combo-box element state. Do not\nset combo-box properties in a `renderer` function.\n\n```js\nconst comboBox = document.querySelector('#combo-box');\ncomboBox.items = [{'label': 'Hydrogen', 'value': 'H'}];\ncomboBox.renderer = (root, comboBox, model) => {\n const item = model.item;\n root.innerHTML = `${model.index}: ${item.label} <b>${item.value}</b>`;\n};\n```\n\nRenderer is called on the opening of the combo-box and each time the related model is updated.\nBefore creating new content, it is recommended to check if there is already an existing DOM\nelement in `root` from a previous renderer call for reusing it. Even though combo-box uses\ninfinite scrolling, reducing DOM operations might improve performance.\n\nThe following properties are available in the `model` argument:\n\nProperty | Type | Description\n-----------|------------------|-------------\n`index` | Number | Index of the item in the `items` array\n`item` | String or Object | The item reference\n`selected` | Boolean | True when item is selected\n`focused` | Boolean | True when item is focused\n\n### Lazy Loading with Function Data Provider\n\nIn addition to assigning an array to the items property, you can alternatively use the\n[`dataProvider`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-combo-box#property-dataProvider) function property.\nThe `<vaadin-combo-box>` calls this function lazily, only when it needs more data\nto be displayed.\n\n__Note that when using function data providers, the total number of items\nneeds to be set manually. The total number of items can be returned\nin the second argument of the data provider callback:__\n\n```js\ncomboBox.dataProvider = async (params, callback) => {\n const API = 'https://demo.vaadin.com/demo-data/1.0/filtered-countries';\n const { filter, page, pageSize } = params;\n const index = page * pageSize;\n\n const res = await fetch(`${API}?index=${index}&count=${pageSize}&filter=${filter}`);\n if (res.ok) {\n const { result, size } = await res.json();\n callback(result, size);\n }\n};\n```\n\n### Styling\n\nThe following custom properties are available for styling:\n\nCustom property | Description | Default\n----------------------------------------|----------------------------|---------\n`--vaadin-field-default-width` | Default width of the field | `12em`\n`--vaadin-combo-box-overlay-width` | Width of the overlay | `auto`\n`--vaadin-combo-box-overlay-max-height` | Max height of the overlay | `65vh`\n\n`<vaadin-combo-box>` provides the same set of shadow DOM parts and state attributes as `<vaadin-text-field>`.\nSee [`<vaadin-text-field>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-text-field) for the styling documentation.\n\nIn addition to `<vaadin-text-field>` parts, the following parts are available for theming:\n\nPart name | Description\n----------------|----------------\n`toggle-button` | The toggle button\n\nIn addition to `<vaadin-text-field>` state attributes, the following state attributes are available for theming:\n\nAttribute | Description | Part name\n----------|-------------|------------\n`opened` | Set when the combo box dropdown is open | :host\n`loading` | Set when new items are expected | :host\n\nIf you want to replace the default `<input>` and its container with a custom implementation to get full control\nover the input field, consider using the [`<vaadin-combo-box-light>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-combo-box-light) element.\n\n### Internal components\n\nIn addition to `<vaadin-combo-box>` itself, the following internal\ncomponents are themable:\n\n- `<vaadin-combo-box-overlay>` - has the same API as [`<vaadin-overlay>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-overlay).\n- `<vaadin-combo-box-item>` - has the same API as [`<vaadin-item>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-item).\n- [`<vaadin-input-container>`](https://cdn.vaadin.com/vaadin-web-components/24.5.0-alpha1/#/elements/vaadin-input-container) - an internal element wrapping the input.\n\nNote: the `theme` attribute value set on `<vaadin-combo-box>` is\npropagated to the internal components listed above.\n\nSee [Styling Components](https://vaadin.com/docs/latest/styling/styling-components) documentation.",
"extension": true,

@@ -473,2 +480,9 @@ "attributes": [

{
"name": ".itemClassNameGenerator",
"description": "A function used to generate CSS class names for dropdown\nitems based on the item. The return value should be the\ngenerated class name as a string, or multiple class names\nseparated by whitespace characters.",
"value": {
"kind": "expression"
}
},
{
"name": ".itemLabelPath",

@@ -475,0 +489,0 @@ "description": "Path for label of the item. If `items` is an array of objects, the\n`itemLabelPath` is used to fetch the displayed string label for each\nitem.\n\nThe item label is also used for matching items when processing user\ninput, i.e., for filtering and selecting items.",

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