forgejo/web_src/js/markup/common.js

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JavaScript
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export function displayError(el, err) {
el.classList.remove('is-loading');
const errorNode = document.createElement('pre');
errorNode.setAttribute('class', 'ui message error markup-block-error');
errorNode.textContent = err.str || err.message || String(err);
el.before(errorNode);
el.setAttribute('data-render-done', 'true');
}