rainbox.email/assets/js/forms.js

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JavaScript
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// For labels to update their state (css selectors based on the value attribute)
document.addEventListener('DOMContentLoaded', () => {
document.querySelectorAll('input').forEach(el => {
if (el.type !== 'checkbox') {
el.setAttribute('value', el.value);
el.addEventListener('change', () => {
el.setAttribute('value', el.value);
});
}
});
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});
window.applyFormMessages = function (formElement, messages) {
for (const fieldName of Object.keys(messages)) {
const field = formElement.querySelector('#field-' + fieldName);
let parent = field.parentElement;
while (parent && !parent.classList.contains('form-field')) parent = parent.parentElement;
if (field) {
let err = field.querySelector('.error');
if (!err) {
err = document.createElement('div');
err.classList.add('error');
parent.insertBefore(err, parent.querySelector('.hint') || parent);
}
err.innerHTML = `<i data-feather="x-circle"></i> ${messages[fieldName].message}`;
}
}
}