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gristlabs_grist-core/app/client/components/FormRenderer.ts

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10 KiB

import * as css from 'app/client/components/FormRendererCss';
import {FormField} from 'app/client/ui/FormAPI';
import {sanitizeHTML} from 'app/client/ui/sanitizeHTML';
import {CellValue} from 'app/plugin/GristData';
import {Disposable, dom, DomContents, Observable} from 'grainjs';
import {marked} from 'marked';
export const CHOOSE_TEXT = '— Choose —';
/**
* A node in a recursive, tree-like hierarchy comprising the layout of a form.
*/
export interface FormLayoutNode {
type: FormLayoutNodeType;
children?: Array<FormLayoutNode>;
// Unique ID of the field. Used only in the Form widget.
id?: string;
// Used by Layout.
submitText?: string;
successURL?: string;
successText?: string;
anotherResponse?: boolean;
// Used by Field.
formRequired?: boolean;
leaf?: number;
// Used by Label and Paragraph.
text?: string;
// Used by Paragraph.
alignment?: string;
}
export type FormLayoutNodeType =
| 'Paragraph'
| 'Section'
| 'Columns'
| 'Submit'
| 'Placeholder'
| 'Layout'
| 'Field'
| 'Label'
| 'Separator'
| 'Header';
/**
* Context used by FormRenderer to build each node.
*/
export interface FormRendererContext {
/** Field metadata, keyed by field id. */
fields: Record<number, FormField>;
/** The root of the FormLayoutNode tree. */
rootLayoutNode: FormLayoutNode;
/** Disables the Submit node if true. */
disabled: Observable<boolean>;
/** Error to show above the Submit node. */
error: Observable<string|null>;
}
/**
* A renderer for a form layout.
*
* Takes the root FormLayoutNode and additional context for each node, and returns
* the DomContents of the rendered form.
*
* A closely related set of classes exist in `app/client/components/Forms/*`; those are
* specifically used to render a version of a form that is suitable for displaying within
* a Form widget, where submitting a form isn't possible.
*
* TODO: merge the two implementations or factor out what's common.
*/
export abstract class FormRenderer extends Disposable {
public static new(layoutNode: FormLayoutNode, context: FormRendererContext): FormRenderer {
const Renderer = FormRenderers[layoutNode.type] ?? ParagraphRenderer;
return new Renderer(layoutNode, context);
}
protected children: FormRenderer[];
constructor(protected layoutNode: FormLayoutNode, protected context: FormRendererContext) {
super();
this.children = (this.layoutNode.children ?? []).map((child) =>
this.autoDispose(FormRenderer.new(child, this.context)));
}
public abstract render(): DomContents;
}
class LabelRenderer extends FormRenderer {
public render() {
return css.label(this.layoutNode.text ?? '');
}
}
class ParagraphRenderer extends FormRenderer {
public render() {
return css.paragraph(
css.paragraph.cls(`-alignment-${this.layoutNode.alignment || 'left'}`),
el => {
el.innerHTML = sanitizeHTML(marked(this.layoutNode.text || '**Lorem** _ipsum_ dolor'));
},
);
}
}
class SectionRenderer extends FormRenderer {
public render() {
return css.section(
this.children.map((child) => child.render()),
);
}
}
class ColumnsRenderer extends FormRenderer {
public render() {
return css.columns(
{style: `--grist-columns-count: ${this.children.length || 1}`},
this.children.map((child) => child.render()),
);
}
}
class SubmitRenderer extends FormRenderer {
public render() {
return [
css.error(dom.text(use => use(this.context.error) ?? '')),
css.submit(
dom('input',
dom.boolAttr('disabled', this.context.disabled),
{
type: 'submit',
value: this.context.rootLayoutNode.submitText || 'Submit'
},
dom.on('click', () => {
// Make sure that all choice or reference lists that are required have at least one option selected.
const lists = document.querySelectorAll('.grist-checkbox-list.required:not(:has(input:checked))');
Array.from(lists).forEach(function(list) {
// If the form has at least one checkbox, make it required.
const firstCheckbox = list.querySelector('input[type="checkbox"]');
firstCheckbox?.setAttribute('required', 'required');
});
// All other required choice or reference lists with at least one option selected are no longer required.
const checkedLists = document.querySelectorAll('.grist-checkbox-list.required:has(input:checked)');
Array.from(checkedLists).forEach(function(list) {
const firstCheckbox = list.querySelector('input[type="checkbox"]');
firstCheckbox?.removeAttribute('required');
});
}),
)
),
];
}
}
class PlaceholderRenderer extends FormRenderer {
public render() {
return dom('div');
}
}
class LayoutRenderer extends FormRenderer {
public render() {
return this.children.map((child) => child.render());
}
}
class FieldRenderer extends FormRenderer {
public build(field: FormField) {
const Renderer = FieldRenderers[field.type as keyof typeof FieldRenderers] ?? TextRenderer;
return new Renderer();
}
public render() {
const field = this.layoutNode.leaf ? this.context.fields[this.layoutNode.leaf] : null;
if (!field) { return null; }
const renderer = this.build(field);
return css.field(renderer.render(field, this.context));
}
}
abstract class BaseFieldRenderer {
public render(field: FormField, context: FormRendererContext) {
return css.field(
this.label(field),
dom('div', this.input(field, context)),
);
}
public name(field: FormField) {
return field.colId;
}
public label(field: FormField) {
return dom('label',
css.label.cls(''),
css.label.cls('-required', Boolean(field.options.formRequired)),
{for: this.name(field)},
field.question,
);
}
public abstract input(field: FormField, context: FormRendererContext): DomContents;
}
class TextRenderer extends BaseFieldRenderer {
public input(field: FormField) {
return dom('input', {
type: 'text',
name: this.name(field),
required: field.options.formRequired,
});
}
}
class DateRenderer extends BaseFieldRenderer {
public input(field: FormField) {
return dom('input', {
type: 'date',
name: this.name(field),
required: field.options.formRequired,
});
}
}
class DateTimeRenderer extends BaseFieldRenderer {
public input(field: FormField) {
return dom('input', {
type: 'datetime-local',
name: this.name(field),
required: field.options.formRequired,
});
}
}
class ChoiceRenderer extends BaseFieldRenderer {
public input(field: FormField) {
const choices: Array<string|null> = field.options.choices || [];
// Insert empty option.
choices.unshift(null);
return css.select(
{name: this.name(field), required: field.options.formRequired},
choices.map((choice) => dom('option', {value: choice ?? ''}, choice ?? CHOOSE_TEXT))
);
}
}
class BoolRenderer extends BaseFieldRenderer {
public render(field: FormField) {
return css.field(
dom('div', this.input(field)),
);
}
public input(field: FormField) {
return css.toggle(
css.label.cls('-required', Boolean(field.options.formRequired)),
dom('input', {
type: 'checkbox',
name: this.name(field),
value: '1',
required: field.options.formRequired,
}),
css.gristSwitch(
css.gristSwitchSlider(),
css.gristSwitchCircle(),
),
dom('span', field.question || field.colId)
);
}
}
class ChoiceListRenderer extends BaseFieldRenderer {
public input(field: FormField) {
const choices: string[] = field.options.choices ?? [];
const required = field.options.formRequired;
return css.checkboxList(
dom.cls('grist-checkbox-list'),
dom.cls('required', Boolean(required)),
{name: this.name(field), required},
choices.map(choice => css.checkbox(
dom('input', {
type: 'checkbox',
name: `${this.name(field)}[]`,
value: choice,
}),
dom('span', choice),
)),
);
}
}
class RefListRenderer extends BaseFieldRenderer {
public input(field: FormField) {
const choices: [number, CellValue][] = field.refValues ?? [];
// Sort by the second value, which is the display value.
choices.sort((a, b) => String(a[1]).localeCompare(String(b[1])));
// Support for 30 choices. TODO: make limit dynamic.
choices.splice(30);
const required = field.options.formRequired;
return css.checkboxList(
dom.cls('grist-checkbox-list'),
dom.cls('required', Boolean(required)),
{name: this.name(field), required},
choices.map(choice => css.checkbox(
dom('input', {
type: 'checkbox',
'data-grist-type': field.type,
name: `${this.name(field)}[]`,
value: String(choice[0]),
}),
dom('span', String(choice[1] ?? '')),
)),
);
}
}
class RefRenderer extends BaseFieldRenderer {
public input(field: FormField) {
const choices: [number|string, CellValue][] = field.refValues ?? [];
// Sort by the second value, which is the display value.
choices.sort((a, b) => String(a[1]).localeCompare(String(b[1])));
// Support for 1000 choices. TODO: make limit dynamic.
choices.splice(1000);
// Insert empty option.
choices.unshift(['', CHOOSE_TEXT]);
return css.select(
{
name: this.name(field),
'data-grist-type': field.type,
required: field.options.formRequired,
},
choices.map((choice) => dom('option', {value: String(choice[0])}, String(choice[1] ?? ''))),
);
}
}
const FieldRenderers = {
'Text': TextRenderer,
'Choice': ChoiceRenderer,
'Bool': BoolRenderer,
'ChoiceList': ChoiceListRenderer,
'Date': DateRenderer,
'DateTime': DateTimeRenderer,
'Ref': RefRenderer,
'RefList': RefListRenderer,
};
const FormRenderers = {
'Paragraph': ParagraphRenderer,
'Section': SectionRenderer,
'Columns': ColumnsRenderer,
'Submit': SubmitRenderer,
'Placeholder': PlaceholderRenderer,
'Layout': LayoutRenderer,
'Field': FieldRenderer,
'Label': LabelRenderer,
// Aliases for Paragraph.
'Separator': ParagraphRenderer,
'Header': ParagraphRenderer,
};