Administration kolega

function solve() {
    let inputName = document.querySelector('input[name="lecture-name"]');
    let inputDate = document.querySelector('input[name="lecture-date"]');
    let inputOptions = document.querySelector('select[name="lecture-module"]');
    let addBtn = document.querySelector('.form-control>button');

    let modules = document.querySelector('.modules');
    addBtn.addEventListener('click', (e) => {
        e.preventDefault();
        if (inputName.value && inputDate.value && inputOptions.value != "Select module") {
            let moduleDiv = document.createElement('div');
            moduleDiv.className = 'module';
            let ul = document.createElement('ul');
            let exists = false;
            let existentMod = document.querySelector(`#${inputOptions.value}`);
            if (existentMod) {
                exists = true;
                moduleDiv = document.querySelector(`#${inputOptions.value}`).parentElement;
                ul = moduleDiv.children[1];
            }
            let moduleName = document.createElement('h3');
            moduleName.id = inputOptions.value;
            let splittedDate = inputDate.value.split('T');
            let date = splittedDate[0];
            let time = splittedDate[1];
            let correctDate = date.split('-').join('/');
            moduleName.innerHTML = `${inputOptions.value.toUpperCase()}-MODULE`;
            let li = document.createElement('li');
            li.className = 'flex';
            let lectureName = document.createElement('h4');
            lectureName.innerHTML = `${inputName.value} - ${correctDate} - ${time}`;
            let delBtn = document.createElement('button');
            delBtn.innerHTML = 'Del';
            delBtn.className = "red";
            delBtn.addEventListener('click', () => {
                let parent = delBtn.parentNode.parentNode;
                delBtn.parentElement.remove();
                if (parent.childElementCount == 0) {
                    parent.parentNode.remove();
                }
            })
            if (!exists) {
                moduleDiv.appendChild(moduleName);
            }
            ul.appendChild(li);
            li.appendChild(lectureName);
            li.appendChild(delBtn);
            ul.appendChild(li);
            moduleDiv.appendChild(ul);
            if (!exists) {
                modules.appendChild(moduleDiv);
            }
            sortList(moduleDiv);
        }
    })
    function sortList(list) {
        let sorted, i;
        let sortFlag = true;
        while (sortFlag) {
            sortFlag = false;
            let LiEle = list.getElementsByTagName("LI");
            for (i = 0; i < LiEle.length - 1; i++) {
                sorted = false;
                if (LiEle[i].innerHTML.split(' - ').slice(1).join(' ').toLowerCase() > LiEle[i + 1].innerHTML.toLowerCase().split(' - ').slice(1).join(' ')) {
                    sorted = true;
                    break;
                }
            }
            if (sorted) {
                LiEle[i].parentNode.insertBefore(LiEle[i + 1], LiEle[i]);
                sortFlag = true;
            }
        }
    }
}