1# GridItem 2 3The **\<GridItem>** component provides a single item in a grid. 4 5> **NOTE** 6> 7> This component is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version. 8 9 10## Child Components 11 12Supported 13 14 15## APIs 16 17GridItem() 18 19 20## Attributes 21 22| Name| Type| Description| 23| -------- | -------- | -------- | 24| rowStart | number | Start row number of the component.| 25| rowEnd | number | End row number of the component.| 26| columnStart | number | Start column number of the component.| 27| columnEnd | number | End column number of the component.| 28| forceRebuild<sup>(deprecated)</sup> | boolean | Whether to re-create the component when it is being built.<br>This API is deprecated since API version 9. Whether to re-create the component is automatically determined based on the component attributes and child component changes. No manual configuration is required.<br>Default value: **false**| 29| selectable<sup>8+</sup> | boolean | Whether the grid item is selectable by the mouse.<br>**NOTE**<br>This attribute takes effect only when mouse frame selection is enabled for the parent **\<Grid>** container.<br>Default value: **true** | 30| selected<sup>10+</sup> | boolean | Whether the grid item is selected. This attribute supports [$$](../../quick-start/arkts-two-way-sync.md) for two-way binding of variables.<br>**NOTE**<br>This attribute must be used before the [style for the selected state](./ts-universal-attributes-polymorphic-style.md) is set. Otherwise, the style settings will not take effect.<br>Default value: **false**| 31 32> **NOTE** 33> 34> Rules for setting **rowStart**, **rowEnd**, **columnStart**, and **columnEnd**: 35> 36> The valid value range of **rowStart** and **rowEnd** is 0 to the total number of rows minus 1. The valid value range of **columnStart** and **columnEnd** is 0 to the total number of columns minus 1. 37> 38> Settings outside of the valid ranges do not take effect. 39> 40> In the grid that has both **columnTemplate** and **rowTemplate** set, grid items that have **rowStart**/**rowEnd** or **columnStart**/**columnEnd** set are laid out in a row-by-row then column-by-column manner. 41> 42> In the grid that has only **columnTemplate** set, grid items that have **columnStart**/**columnEnd** set are laid out in the specific columns. If there are already grid items in those columns, the grid items will be laid out in another row. 43> 44> In the grid that has only **rowTemplate** set, grid items that have **rowStart**/**rowEnd** set are laid out in the specific rows. If there are already grid items in those rows, the grid items will be laid out in another column. 45> 46> In the grid that has only **columnTemplate** set, grid items whose row or column number settings are invalid are laid out in a row-by-row then column-by-column manner. 47> 48> In the grid that has neither **columnTemplate** nor **rowTemplate** set, the row and column number attributes do not work. 49 50 51## Events 52 53| Name| Description| 54| -------- | -------- | 55| onSelect(event: (isSelected: boolean) => void)<sup>8+</sup> | Triggered when the selected state of the grid item changes.<br>**isSelected**: returns **true** if the grid item is being selected by the mouse; returns **false** otherwise. | 56 57 58## Example 59 60```ts 61// xxx.ets 62@Entry 63@Component 64struct GridItemExample { 65 @State numbers: string[] = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15"] 66 67 build() { 68 Column() { 69 Grid() { 70 GridItem() { 71 Text('4') 72 .fontSize(16) 73 .backgroundColor(0xFAEEE0) 74 .width('100%') 75 .height('100%') 76 .textAlign(TextAlign.Center) 77 }.rowStart(1).rowEnd(2).columnStart(1).columnEnd(2) // Set valid row and column numbers. 78 79 ForEach(this.numbers, (item: string) => { 80 GridItem() { 81 Text(item) 82 .fontSize(16) 83 .backgroundColor(0xF9CF93) 84 .width('100%') 85 .height('100%') 86 .textAlign(TextAlign.Center) 87 } 88 }, (item: string) => item) 89 90 GridItem() { 91 Text('5') 92 .fontSize(16) 93 .backgroundColor(0xDBD0C0) 94 .width('100%') 95 .height('100%') 96 .textAlign(TextAlign.Center) 97 }.columnStart(1).columnEnd(4) // Set only the column numbers. The layout does not start from the first column. 98 } 99 .columnsTemplate('1fr 1fr 1fr 1fr 1fr') 100 .rowsTemplate('1fr 1fr 1fr 1fr 1fr') 101 .width('90%').height(300) 102 }.width('100%').margin({ top: 5 }) 103 } 104} 105``` 106 107 108
