GridValidationBuilder

A DataValidationBuilder for a `https://developers.google.com/apps-script/reference/forms/grid-validation`.

```javascript
// Add a grid item to a form and require one response per column.
const form = FormApp.create('My Form');
const gridItem = form.addGridItem();
gridItem.setTitle('Rate your interests')
    .setRows(['Cars', 'Computers', 'Celebrities'])
    .setColumns(['Boring', 'So-so', 'Interesting']);
const gridValidation = FormApp.createGridValidation()
                           .setHelpText('Select one item per column.')
                           .requireLimitOneResponsePerColumn()
                           .build();
gridItem.setValidation(gridValidation);
```

### Methods

| Method | Return type | Brief description |
|---|---|---|
| `https://developers.google.com/apps-script/reference/forms/grid-validation-builder#requireLimitOneResponsePerColumn()` | `https://developers.google.com/apps-script/reference/forms/grid-validation-builder#` | Requires limit of one response per column for a grid item. |

## Detailed documentation

### `requireLimitOneResponsePerColumn()`

Requires limit of one response per column for a grid item.

#### Return


`https://developers.google.com/apps-script/reference/forms/grid-validation-builder#` --- this validation builder, for chaining