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The DataTableEditor component provides an intuitive interface for entering labels and values for your charts. It supports two value modes, real-time validation, and flexible row management.

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Component Overview

The DataTableEditor is implemented in src/components/DataTableEditor.jsx and handles all data input for chart generation. 
// From DataTableEditor.jsx:9-19
export default function DataTableEditor({
  rows,
  fieldErrors,
  valueMode,
  recentlyAddedRowId,
  onChangeValueMode,
  onUpdateRow,
  onAddRow,
  onRemoveRow,
  onClearRows
})

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Value Modes

Simple Charts supports two different value input modes to accommodate different data types:
Use exact numeric values for your data points. This mode is ideal for:
  • Counting responses (e.g., 15 students chose option A)
  • Displaying raw scores
  • Any data where absolute values matter
// From DataTableEditor.jsx:42-46
<Tabs value={valueMode} onValueChange={(value) => onChangeValueMode(value)}>
  <TabsList className="grid w-full grid-cols-2">
    <TabsTrigger value="exact">Numbers</TabsTrigger>
    <TabsTrigger value="percentage">Percentages</TabsTrigger>
  </TabsList>
</Tabs>
Input placeholder: "0"

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Value Mode Implementation

// From DataTableEditor.jsx:55-57
<th className="pb-2 font-medium">
  {valueMode === "percentage" ? "Percent (%)" : "Value"}
</th>
The column header dynamically updates based on the selected mode.

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Row Management

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Adding Rows

Click the “Add Row” button to create a new data entry row: 
// From DataTableEditor.jsx:32-35
<Button type="button" size="sm" onClick={onAddRow}>
  <Plus className="mr-1 h-4 w-4" />
  Add Row
</Button>
Newly added rows are highlighted with a subtle animation: 
// From DataTableEditor.jsx:67-70
className={cn(
  "border-b transition-colors last:border-b-0",
  recentlyAddedRowId === row.id ? "animate-row-in bg-primary/5" : ""
)}

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Removing Rows

Each row has a remove button (trash icon) on the right side: 
// From DataTableEditor.jsx:106-115
<Button
  type="button"
  variant="ghost"
  size="icon"
  onClick={() => onRemoveRow(row.id)}
  disabled={rows.length <= 1}
  aria-label={`Remove row ${index + 1}`}
>
  <Trash2 className="h-4 w-4" />
</Button>
You cannot remove the last remaining row. At least one row must always be present in the table.

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Clearing All Data

The “Clear” button removes all data and resets to a single empty row: 
// From DataTableEditor.jsx:29-31
<Button type="button" variant="outline" size="sm" onClick={onClearRows}>
  Clear
</Button>

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Input Fields

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Label Field

Each row has a label field for the category name: 
// From DataTableEditor.jsx:76-83
<Input
  id={`label-${row.id}`}
  type="text"
  value={row.label}
  onChange={(event) => onUpdateRow(row.id, "label", event.target.value)}
  placeholder={`Option ${index + 1}`}
  className={rowErrors.label ? "border-red-500 focus-visible:ring-red-400" : ""}
/>

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Value Field

The value field accepts numeric input with decimal support: 
// From DataTableEditor.jsx:92-100
<Input
  id={`value-${row.id}`}
  type="text"
  inputMode="decimal"
  value={row.value}
  onChange={(event) => onUpdateRow(row.id, "value", event.target.value)}
  placeholder={valueMode === "percentage" ? "0-100" : "0"}
  className={rowErrors.value ? "border-red-500 focus-visible:ring-red-400" : ""}
/>
The inputMode="decimal" attribute optimizes mobile keyboards for numeric entry, showing a decimal keypad on touch devices.

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Field Validation

Simple Charts validates data in real-time and displays inline error messages.

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Error Display

Validation errors appear below the corresponding input field: 
// From DataTableEditor.jsx:84-86
{rowErrors.label ? (
  <p className="animate-error-in mt-1 text-xs text-red-600">{rowErrors.label}</p>
) : null}

// From DataTableEditor.jsx:101-103
{rowErrors.value ? (
  <p className="animate-error-in mt-1 text-xs text-red-600">{rowErrors.value}</p>
) : null}

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Validation Rules

From App.jsx:177-217, the validation system checks: 
// From App.jsx:192-194
if (!label) {
  fieldErrors[row.id].label = "Label required";
}

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Empty Row Handling

Rows with no content in either field are silently ignored: 
// From App.jsx:181-188
const label = row.label.trim();
const valueText = String(row.value).trim();
const hasAnyContent = label.length > 0 || valueText.length > 0;

if (!hasAnyContent) {
  return;
}

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Row State Management

Each row is identified by a unique ID and contains label and value data: 
// From App.jsx:92-98
function createRow(index = 1) {
  return {
    id: createId(),
    label: `Option ${index}`,
    value: String(index * 5)
  };
}

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Updating Row Data

// From App.jsx:498-503
function handleUpdateRow(id, key, value) {
  setAppState((current) => ({
    ...current,
    rows: current.rows.map((row) => (row.id === id ? { ...row, [key]: value } : row))
  }));
}

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Accessibility Features

The DataTableEditor includes several accessibility enhancements:
  • Screen reader labels for each input field
  • ARIA labels for remove buttons
  • Semantic table structure with proper headers
  • Keyboard navigation support through standard HTML inputs
// From DataTableEditor.jsx:73-75
<Label className="sr-only" htmlFor={`label-${row.id}`}>
  Label {index + 1}
</Label>

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Visual Feedback

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Row Animations

Newly added rows fade in with a background highlight: 
/* Applied via className */
animate-row-in bg-primary/5

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Error Animations

Validation errors appear with a smooth animation: 
/* Applied via className */
animate-error-in

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Border Highlighting

Invalid fields show a red border: 
className={rowErrors.label ? "border-red-500 focus-visible:ring-red-400" : ""}