MediaWiki:Vector.js

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/* All JavaScript here will be loaded for users of the Vector skin */

function addGalleryRow() {
    const container = document.getElementById('gallery-builder');
    const row = container.firstElementChild.cloneNode(true);

    row.querySelectorAll('input').forEach(i => i.value = '');
    container.appendChild(row);
}

mw.hook('pf.formSubmit').add(function () {
    let gallery = '<gallery>\n';

    document.querySelectorAll('.gallery-row').forEach(row => {
        const image = row.querySelector('[name="gallery_image[]"]').value;
        const caption = row.querySelector('[name="gallery_caption[]"]').value;

        if (image) {
            gallery += 'File:' + image.replace(/^File:/, '') +
                       (caption ? '|' + caption : '') + '\n';
        }
    });

    gallery += '</gallery>';

    document.querySelector('[name="gallery"]').value = gallery;
});