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form.ts
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form.ts
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import { LitElement, css, html } from 'lit';
import { property } from 'lit/decorators.js';
import { alternateName } from '../common/decorators/alternateName.js';
import { blazorSuppress } from '../common/decorators/blazorSuppress.js';
import { registerComponent } from '../common/definitions/register.js';
import type { Constructor } from '../common/mixins/constructor.js';
import { EventEmitterMixin } from '../common/mixins/event-emitter.js';
export interface IgcFormEventMap {
igcSubmit: CustomEvent<FormData>;
igcReset: CustomEvent;
}
/**
* The form is a component used to collect user input from
* interactive controls.
*
* @element igc-form
*
* @slot - Default slot for the form.
*
* @fires igcSubmit - Emitted when the form is submitted.
* @fires igcReset - Emitted when the form is reset.
*
* @deprecated since version 4.4.0. Use the native `<form>` element instead.
*/
export default class IgcFormComponent extends EventEmitterMixin<
IgcFormEventMap,
Constructor<LitElement>
>(LitElement) {
public static readonly tagName = 'igc-form';
public static styles = css`
:host {
display: block;
}
`;
/* blazorSuppress */
public static register() {
registerComponent(IgcFormComponent);
}
private _controlsWithChecked = [
'input',
'radio',
'igc-radio',
'igc-switch',
'igc-checkbox',
];
private _controlsWithValue = [
'input',
'igc-input',
'igc-mask-input',
'textarea',
'igc-rating',
'igc-select',
'igc-combo',
'igc-date-time-input',
];
private _controlsThatSubmit = [
'input',
'button',
'igc-button',
'igc-icon-button',
];
/** Specifies if form data validation should be skipped on submit. */
@property({ type: Boolean, reflect: true }) public novalidate = false;
constructor() {
super();
this.addEventListener('click', this.handleClick);
}
/** Submits the form. */
@alternateName('performSubmit')
public submit(): boolean {
const formData = this.getFormData();
if (!this.novalidate && !this.reportValidity()) {
return false;
}
this.emitEvent('igcSubmit', { detail: formData });
return true;
}
/** Resets the form. */
@alternateName('performReset')
public reset() {
const formElements = this.getFormElements();
formElements.forEach((element) => {
const tagName = element.tagName.toLowerCase();
if (tagName === 'select') {
for (let i = 0; i < element.options.length; i++) {
const option = element.options[i];
option.selected = option.defaultSelected;
}
} else if (
(tagName === 'input' &&
(element.type === 'checkbox' || element.type === 'radio')) ||
(tagName !== 'input' && this._controlsWithChecked.includes(tagName))
) {
element.checked = element.hasAttribute('checked');
} else if (
tagName === 'igc-input' ||
tagName === 'igc-rating' ||
tagName === 'igc-mask-input' ||
tagName === 'igc-date-time-input'
) {
element.value = element.getAttribute('value');
} else if (this._controlsWithValue.includes(tagName)) {
element.value = element.defaultValue;
}
});
this.emitEvent('igcReset');
}
private getFormElements(): any[] {
const slot = this.shadowRoot?.querySelector('slot');
const assignedElements = slot?.assignedElements({ flatten: true });
const formElements: any[] = [];
assignedElements?.forEach((element: any) => {
if (!element.disabled) {
formElements.push(element);
}
const children = Array.from(element.getElementsByTagName('*')).filter(
(element: any) => !element.disabled
);
formElements.push(...children);
});
return formElements;
}
//suppressing in blazor for now due to an issue, bringing it back later
/** Retrieves the data from the form in the format of a FormData object. */
@blazorSuppress()
public getFormData() {
const formData = new FormData();
const formElements = this.getFormElements();
formElements.forEach((element) => {
const tagName = element.tagName.toLowerCase();
if (tagName === 'select') {
for (let i = 0; i < element.options.length; i++) {
const option = element.options[i];
if (option.selected) {
formData.append(element.name, option.value);
}
}
} else if (
this._controlsWithChecked.includes(tagName) &&
element.checked
) {
formData.append(element.name, element.value || 'on');
} else if (
this._controlsWithValue.includes(tagName) &&
element.type !== 'checkbox' &&
element.type !== 'radio' &&
element.type !== 'submit'
) {
formData.append(element.name, element.value);
}
});
return formData;
}
/** Checks for validity of the form. */
public reportValidity(): boolean {
const formElements = this.getFormElements();
return !formElements.some(
(element) =>
typeof element.reportValidity === 'function' &&
element.reportValidity() === false
);
}
private handleClick(event: MouseEvent) {
const targetElement: any = event.target as HTMLElement;
if (
this._controlsThatSubmit.includes(targetElement.tagName.toLowerCase()) &&
targetElement.type?.toLowerCase() === 'submit'
) {
this.submit();
} else if (targetElement.type?.toLowerCase() === 'reset') {
this.reset();
}
return true;
}
protected override render() {
return html`<slot></slot>`;
}
}
declare global {
interface HTMLElementTagNameMap {
'igc-form': IgcFormComponent;
}
}