swaf-boilerplate/assets/ts/forms.ts

/*
 * For labels to update their state (css selectors based on the value attribute)
 */
export function updateInputs() {
    document.querySelectorAll<HTMLInputElement | HTMLTextAreaElement>('input, textarea').forEach(el => {
        if (!el.dataset.inputSetup) {
            el.dataset.inputSetup = 'true';
            if (el.type !== 'checkbox') {
                el.setAttribute('value', el.value);
                el.addEventListener('change', () => {
                    el.setAttribute('value', el.value);
                });
            }
        }
    });
}

document.addEventListener('DOMContentLoaded', () => {
    updateInputs();
});

export function applyFormMessages(formElement: HTMLFormElement, messages: { [p: string]: any }) {
    for (const fieldName of Object.keys(messages)) {
        const field = formElement.querySelector('#field-' + fieldName);
        if (!field) continue;

        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}`;
        }
    }
}