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Update cascading combos topic for React 19 #1505

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merged 2 commits into from
Jun 17, 2025
Merged

Update cascading combos topic for React 19 #1505

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158502c
Update cascading combos topic for React 19
IMinchev64 May 2, 2025
01cd027
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IMinchev64 May 8, 2025
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18 changes: 8 additions & 10 deletions doc/en/components/grids/_shared/cascading-combos.md
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Original file line number Diff line number Diff line change
Expand Up @@ -50,8 +50,7 @@ builder.Services.AddIgniteUIBlazor(
```

```tsx
import { IgrComboModule, IgrCombo } from 'igniteui-react';
IgrComboModule.register();
import { IgrCombo } from 'igniteui-react';
```

Then you should define the column template with the combo:
Expand All @@ -61,22 +60,21 @@ Then you should define the column template with the combo:
<IgrColumn
field="Country"
header="Country"
bodyTemplate={webGridCountryDropDownTemplate}
name="column1">
bodyTemplate={webGridCountryDropDownTemplate}>
</IgrColumn>
```

```tsx
function webGridCountryDropDownTemplate(props: {dataContext: IgrCellTemplateContext}) => {
var cell = props.dataContext.cell as any;
const webGridCountryDropDownTemplate = (ctx: IgrCellTemplateContext) => {
var cell = ctx.cell as any;
if (cell === undefined) {
return <></>;
}
const id = cell.id.rowID;
const comboId = "country" + id;
return (
<>
<IgrCombo data={countries} ref={comboRefs} change={(x: any, args: any) => {onCountryChange(id, x, args) }} placeholder="Choose Country..." valueKey="Country" displayKey="Country" singleSelect="true" name={comboId}></IgrCombo>
<IgrCombo data={countries} ref={comboRefs} onChange={(event: CustomEvent) => { onCountryChange(id, event) }} placeholder="Choose Country..." valueKey="Country" displayKey="Country" singleSelect="true" name={comboId}></IgrCombo>
</>
);
}
Expand Down Expand Up @@ -105,7 +103,7 @@ public webGridCountryDropDownTemplate: IgcRenderFunction<IgcCellTemplateContext>

- `displayKey` - Required for object arrays - Specifies which property will be used for the items' text. If no value is specified for `displayKey`, the combo will use the specified `valueKey` (if any).

In order to handle the selection change, we need the `change` event. The emitted event arguments contain information about the selection prior to the change, the current selection and the items that were added or removed. Therefore, it will filter the values based on the selection of the previous combo.
In order to handle the selection change, we need the `onChange` event. The emitted event arguments contain information about the selection prior to the change, the current selection and the items that were added or removed. Therefore, it will filter the values based on the selection of the previous combo.

```razor
//In Javascript
Expand Down Expand Up @@ -163,10 +161,10 @@ public bindEventsCountryCombo(rowId: any, cell: any) {
```

```tsx
function onCountryChange(rowId: string, cmp: any, args:any) {
const onCountryChange = (rowId: string, event: CustomEvent) => {
const regionCombo = comboRefCollection.get("region_" + rowId);
setTimeout(() => {
const newValue = cmp.value[0];
const newValue = event.detail.newValue[0];
if (newValue === undefined) {
regionCombo.deselect(regionCombo.value);
regionCombo.disabled = true;
Expand Down