ctx.form

The Ant Design Form instance within the current block, used to read/write form fields, trigger validation, and submission. It is equivalent to ctx.blockModel?.form and can be used directly in form-related blocks (Form, Edit Form, Sub-form, etc.).

Use Cases

Note: ctx.form is only available in RunJS contexts related to form blocks (Form, Edit Form, Sub-form, etc.). It may not exist in non-form scenarios (such as independent JSBlocks or Table blocks). It is recommended to perform a null check before use: ctx.form?.getFieldsValue().

Type Definition

form: FormInstance<any>;

FormInstance is the instance type of Ant Design Form. Common methods are as follows.

Common Methods

Reading Form Values

// Read values of currently registered fields (defaults to rendered fields only)
const values = ctx.form.getFieldsValue();

// Read values of all fields (including registered but unrendered fields, e.g., hidden or inside collapsed sections)
const allValues = ctx.form.getFieldsValue(true);

// Read a single field
const email = ctx.form.getFieldValue('email');

// Read nested fields (e.g., in a sub-table)
const amount = ctx.form.getFieldValue(['orders', 0, 'amount']);

Writing Form Values

// Batch update (commonly used for linkage)
ctx.form.setFieldsValue({
  status: 'active',
  updatedAt: new Date(),
});

// Update a single field
ctx.form.setFieldValue('remark', 'Updated remark');

Validation and Submission

// Trigger form validation
await ctx.form.validateFields();

// Trigger form submission
ctx.form.submit();

Resetting

// Reset all fields
ctx.form.resetFields();

// Reset only specific fields
ctx.form.resetFields(['status', 'remark']);

Relationship with Related Contexts

ctx.getValue / ctx.setValue

Within the current JS field, prioritize using getValue/setValue to read/write the field itself; use ctx.form when you need to access other fields.

ctx.blockModel

ctx.getVar('ctx.formValues')

Form values must be obtained via await ctx.getVar('ctx.formValues') and are not directly exposed as ctx.formValues. In a form context, it is preferred to use ctx.form.getFieldsValue() to read the latest values in real-time.

Notes

• getFieldsValue() returns only rendered fields by default. To include unrendered fields (e.g., in collapsed sections or hidden by conditional rules), pass true: getFieldsValue(true).
• Paths for nested fields like sub-tables are arrays, e.g., ['orders', 0, 'amount']. You can use ctx.namePath to get the current field's path and construct paths for other columns in the same row.
• validateFields() throws an error object containing errorFields and other information. If validation fails before submission, you can use ctx.exit() to terminate subsequent steps.
• In asynchronous scenarios like workflows or linkage rules, ctx.form might not be ready yet. It is recommended to use optional chaining or null checks.

Examples

Field Linkage: Display different content based on type

const type = ctx.form.getFieldValue('type');
if (type === 'vip') {
  ctx.form.setFieldsValue({ discount: 0.8 });
} else {
  ctx.form.setFieldsValue({ discount: 1 });
}

Calculate current field based on other fields

const quantity = ctx.form.getFieldValue('quantity') ?? 0;
const price = ctx.form.getFieldValue('price') ?? 0;
ctx.setValue(quantity * price);

Read/Write other columns in the same row within a sub-table

// ctx.namePath is the path of the current field in the form, e.g., ['orders', 0, 'amount']
// Read 'status' in the same row: ['orders', 0, 'status']
const rowIndex = ctx.namePath?.[1];
const status = ctx.form.getFieldValue(['orders', rowIndex, 'status']);

Pre-submission Validation

try {
  await ctx.form.validateFields();
  // Validation passed, continue with submission logic
} catch (e) {
  ctx.message.error('Please check the form fields');
  ctx.exit();
}

Submit after Confirmation

const confirmed = await ctx.modal.confirm({
  title: 'Confirm Submission',
  content: 'You will not be able to modify this after submission. Continue?',
  okText: 'Confirm',
  cancelText: 'Cancel',
});
if (confirmed) {
  await ctx.form.validateFields();
  ctx.form.submit();
} else {
  ctx.exit(); // Terminate if user cancels
}

Related

• ctx.getValue() / ctx.setValue(): Read and write the current field value.
• ctx.blockModel: Parent block model; ctx.form is equivalent to ctx.blockModel?.form.
• ctx.modal: Confirmation dialogs, often used with ctx.form.validateFields() and ctx.form.submit().
• ctx.exit(): Terminate the process upon validation failure or user cancellation.
• ctx.namePath: The path (array) of the current field in the form, used to construct names for getFieldValue / setFieldValue in nested fields.