add doc

Signed-off-by: Nester.zhou <ester.zhou@huawei.com>

en/application-dev/reference/arkui-ts/ts-basic-components-search.md

+#  Search
+
+> ![](public_sys-resources/icon-note.gif) **NOTE** This component is supported since API version 8. Updates will be marked with a superscript to indicate their earliest API version.
+
+The **\<Search>** component provides an input area for users to search.
+
+## Required Permissions
+
+None
+
+## Child Components
+
+None
+
+## APIs
+
+Search(options?: { value?: string; placeholder?: string; icon?: string; controller?: SearchController })
+
+- Parameters
+
+  | Name| Type| Mandatory| Default Value| Description|
+  | -------- | -------- | -------- | -------- | -------- |
+  | value  | string | No| - | Text input in the search text box.|
+  | placeholder  | string | No  | - | Text displayed when there is no input.|
+  | icon | string | No| - | Path to the search icon. By default, the system search icon is used. The supported icon formats are svg, jpg, and png.|
+  | controller | SearchController | No| - | Controller.|
+
+
+## Attributes
+
+| Name| Type| Default Value| Description|
+| -------- | -------- | -------- | -------- |
+| searchButton | string | –| Text on the search button located next to the search text box. By default, there is no search button.|
+| placeholderColor | [ResourceColor](../../ui/ts-types.md#ResourceColor) | - | Placeholder text color.|
+| placeholderFont | [Font](../../ui/ts-types.md#Font) | - | Placeholder text style.|
+| textFont | [Font](../../ui/ts-types.md#Font) | - | Text font for the search text box.|
+
+## Events
+
+| Name| Description|
+| -------- | -------- |
+| onSubmit(callback: (value: string) => void) | Triggered when users click the search icon or the search button, or tap the search button on a soft keyboard.<br> -**value**: current text input.|
+| onChange(callback: (value: string) => void) | Triggered when the input in the text box changes.<br> -**value**: current text input.|
+| onCopy(callback: (value: string) => void) | Triggered when data is copied to the pasteboard.<br> -**value**: text copied.|
+| onCut(callback: (value: string) => void) | Triggered when data is cut from the pasteboard.<br> -**value**: text cut.|
+| onPaste(callback: (value: string) => void) | Triggered when data is pasted from the pasteboard.<br> -**value**: text pasted.|
+
+## SearchController
+
+Defines the controller of the **\<Search>** component.
+
+#### Objects to Import
+```
+controller: SearchController = new SearchController()
+```
+#### caretPosition
+
+creatPosition(value: number): viod
+
+Sets the position of the caret.
+
+- Parameters
+
+  | Name | Type  | Mandatory  | Default Value | Description                 |
+  | ---- | ------ | ---- | ---- | --------------------- |
+  | value | number | Yes   | -    | Length from the start of the character string to the position where the caret is located.|
+
+
+
+##  Example
+
+```
+@Entry
+@Component
+struct SearchExample {
+  @State changevalue: string = ''
+  @State submitvalue: string = ''
+  controller: SearchController = new SearchController()
+
+  build() {
+    Flex({ direction: FlexDirection.Row, justifyContent: FlexAlign.Center, alignItems: ItemAlign.Center }) {
+      Text(this.submitvalue)
+      Text(this.changevalue)
+      Search({value: '', placeholder: 'Type to search', controller: this.controller})
+        .searchButton('Search')
+        .width(400)
+        .height(35)
+        .backgroundColor(Color.White)
+        .placeholderColor(Color.Grey)
+        .placeholderFont({ size: 50, weight: 10, family: 'serif', style: FontStyle.Normal })
+        .onSubmit((value: string) => {
+          this.submitvalue = value
+        })
+        .onChange((value: string) => {
+          this.changevalue = value
+        })
+        .margin({ top: 30 })
+    }
+  }
+}
+```