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Styled XML parser is used by iText modules to parse HTML and XML
There is a newer version: 8.0.5
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 iText Group NV
    Authors: iText Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */
package com.itextpdf.styledxmlparser.jsoup.nodes;

import com.itextpdf.styledxmlparser.jsoup.helper.KeyVal;
import com.itextpdf.styledxmlparser.jsoup.parser.Tag;
import com.itextpdf.styledxmlparser.jsoup.select.Elements;

import java.util.ArrayList;
import java.util.List;

/**
 * A HTML Form Element provides ready access to the form fields/controls that are associated with it. It also allows a
 * form to easily be submitted.
 */
public class FormElement extends Element {
    private final Elements elements = new Elements();

    /**
     * Create a new, standalone form element.
     *
     * @param tag        tag of this element
     * @param baseUri    the base URI
     * @param attributes initial attributes
     */
    public FormElement(Tag tag, String baseUri, Attributes attributes) {
        super(tag, baseUri, attributes);
    }

    /**
     * Get the list of form control elements associated with this form.
     * @return form controls associated with this element.
     */
    public Elements elements() {
        return elements;
    }

    /**
     * Add a form control element to this form.
     * @param element form control to add
     * @return this form element, for chaining
     */
    public FormElement addElement(Element element) {
        elements.add(element);
        return this;
    }

    @Override
    protected void removeChild(Node out) {
        super.removeChild(out);
        elements.remove((Element) out);
    }

    /**
     * Get the data that this form submits. The returned list is a copy of the data, and changes to the contents of the
     * list will not be reflected in the DOM.
     * @return a list of key vals
     */
    public List formData() {
        ArrayList data = new ArrayList<>();

        // iterate the form control elements and accumulate their values
        for (Element el: elements) {
            if (!el.tag().isFormSubmittable()) continue; // contents are form listable, superset of submitable
            if (el.hasAttr("disabled")) continue; // skip disabled form inputs
            String name = el.attr("name");
            if (name.length() == 0) continue;
            String type = el.attr("type");

            if (type.equalsIgnoreCase("button")) continue; // browsers don't submit these

            if ("select".equals(el.normalName())) {
                Elements options = el.select("option[selected]");
                boolean set = false;
                for (Element option: options) {
                    data.add(KeyVal.create(name, option.val()));
                    set = true;
                }
                if (!set) {
                    Element option = el.selectFirst("option");
                    if (option != null)
                        data.add(KeyVal.create(name, option.val()));
                }
            } else if ("checkbox".equalsIgnoreCase(type) || "radio".equalsIgnoreCase(type)) {
                // only add checkbox or radio if they have the checked attribute
                if (el.hasAttr("checked")) {
                    final String val = el.val().length() >  0 ? el.val() : "on";
                    data.add(KeyVal.create(name, val));
                }
            } else {
                data.add(KeyVal.create(name, el.val()));
            }
        }
        return data;
    }

    @Override
    public Object clone() {
        return (FormElement) super.clone();
    }
}