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97 lines
7.8 KiB
Markdown
97 lines
7.8 KiB
Markdown
---
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title: Image
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lang: en-US
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---
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# Image
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Besides the native features of img, support lazy load, custom placeholder and load failure, etc.
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## Basic Usage
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:::demo Indicate how the image should be resized to fit its container by `fit`, same as native [object-fit](https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit)。
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image/basic-usage
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:::
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## Placeholder
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:::demo Custom placeholder content when image hasn't loaded yet by `slot = placeholder`
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image/placeholder
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:::
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## Load Failed
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:::demo Custom failed content when error occurs to image load by `slot = error`
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image/load-failed
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:::
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## Lazy Load
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:::demo Use lazy load by `lazy = true`. Image will load until scroll into view when set. You can indicate scroll container that adds scroll listener to by `scroll-container`. If undefined, will be the nearest parent container whose overflow property is auto or scroll.
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image/lazy-load
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:::
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## Image Preview
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:::demo allow big image preview by setting `previewSrcList` prop. You can initialize the position of the first picture previewed by `initial-index`. The default initial position is 0.
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image/image-preview
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:::
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## Image Attributes
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| Attribute | Description | Type | Accepted values | Default |
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| ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------- | ------------------------------------------ | ---------------------------------------------------------------------- |
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| alt | Native alt | string | - | - |
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| fit | Indicate how the image should be resized to fit its container, same as [object-fit](https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit) | string | fill / contain / cover / none / scale-down | - |
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| hide-on-click-modal | When enabling preview, use this flag to control whether clicking on backdrop can exit preview mode | boolean | true / false | false |
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| initial-index | The initial preview image index, less than the length of `url-list` | number | int | 0 |
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| lazy | Whether to use lazy load | boolean | — | false |
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| preview-src-list | allow big image preview | Array | — | - |
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| referrer-policy | Native referrerPolicy | string | - | - |
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| src | Image source, same as native | string | — | - |
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| scroll-container | The container to add scroll listener when using lazy load | string / HTMLElement | — | The nearest parent container whose overflow property is auto or scroll |
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| z-index | set image preview z-index | Number | — | 2000 |
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| preview-teleported | whether to append image-viewer to body. A nested parent element attribute transform should have this attribute set to `true` | boolean | — | false |
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## Image Events
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| Event Name | Description | Parameters |
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| ---------- | -------------------- | ---------- |
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| load | Same as native load | (e: Event) |
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| error | Same as native error | (e: Error) |
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## Image Slots
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| Name | Description |
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| ----------- | ------------------------------- |
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| placeholder | Triggers when image load |
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| error | Triggers when image load failed |
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## ImageViewer Attributes
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| Attribute | Description | Type | Acceptable Value | Default |
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| ------------------- | ---------------------------------------------------------------------------------------------------------------------------- | --------------- | ------------------- | ------- |
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| url-list | Preview link list | Array\<string\> | - | [] |
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| z-index | Preview backdrop z-index | number / string | int / string\<int\> | 2000 |
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| initial-index | The initial preview image index, less than or equal to the length of `url-list` | number | int | 0 |
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| infinite | Whether preview is infinite | boolean | true / false | true |
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| hide-on-click-modal | Whether user can emit close event when clicking backdrop | boolean | true / false | false |
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| teleported | whether to append image itself to body. A nested parent element attribute transform should have this attribute set to `true` | boolean | — | false |
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## ImageViewer Events
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| Event name | Description | Callback parameter |
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| ---------- | ---------------------------------------------------------------------------------------------- | -------------------------------------- |
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| close | Emitted when clicking on `X` button or when `hide-on-click-modal` enabled clicking on backdrop | None |
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| switch | When switching images | `(val: number)` switching target index |
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