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export class VirtualForm
{
/**
* @private
* @param {HTMLFormElement|null} form
*/
constructor(form) {
this.form = form || null;
}
/**
* @public
* @param {string} html
* @returns {VirtualForm}
*/
static createFromHtml(html) {
const tempNode = document.createElement('div');
tempNode.innerHTML = html;
const form = tempNode.querySelector('form');
return new VirtualForm(form);
}
/**
* @public
* @param {HTMLElement} node
* @returns {VirtualForm}
*/
static createFromNode(node) {
if (node instanceof HTMLFormElement) {
return new VirtualForm(node);
}
const form = node.querySelector('form');
return new VirtualForm(form);
}
/**
* @public
* @returns {boolean}
*/
submit() {
if (!this.canSubmit()) {
return false;
}
if (this.isVirtual()) {
const tempNode = document.createElement('div');
tempNode.style.display = 'none';
tempNode.append(this.form);
document.body.appendChild(tempNode);
}
HTMLFormElement.prototype.submit.call(this.form);
return true;
}
/**
* @public
* @returns {boolean}
*/
canSubmit() {
return this.isValidFormObject() && this.containsAllowedInputTypesOnly();
}
/**
* @private
* @returns {boolean}
*/
isValidFormObject() {
return this.form instanceof HTMLFormElement;
}
/**
* @private
* @returns {boolean}
*/
containsAllowedInputTypesOnly() {
if (!this.form || !this.form.elements) {
return false;
}
// eslint-disable-next-line no-plusplus
for (let i = 0; i < this.form.elements.length; i++) {
if (!VirtualForm.elementAllowed(this.form.elements[i])) {
return false;
}
}
return true;
}
/**
* @private
* @param element
* @returns {boolean}
*/
static elementAllowed(element) {
const allowedTypes = VirtualForm.getAllowedInputTypes();
if (element instanceof HTMLInputElement) {
return allowedTypes.indexOf(element.type) !== -1;
}
return true;
}
/**
* @private
* @returns {string[]}
*/
static getAllowedInputTypes() {
return ['hidden', 'submit'];
}
/**
* @public
* @returns {boolean}
*/
isVirtual() {
if (this.form) {
return !document.body.contains(this.form);
}
return true;
}
}