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// Tüm elementleri seçme
const form = document.querySelector("#todo-form");
const todoInput = document.querySelector("#todo");
const todoList = document.querySelector(".list-group");
const firstCardBody = document.querySelectorAll(".card-body")[0];
const secondCardBody = document.querySelectorAll(".card-body")[1];
const filter = document.querySelector("#filter");
const clearButton = document.querySelector("#clear-todos");

eventListeners();

function eventListeners(){ // Tüm event listenerlar
form.addEventListener("submit",addTodo);
document.addEventListener("DOMContentLoaded",loadAllTodosToUI);
secondCardBody.addEventListener("click",deleteTodo);
filter.addEventListener("keyup",filterTodos);
clearButton.addEventListener("click",clearAllTodos);

}
function clearAllTodos(e){
if (confirm("Tümünü silmek istediğinize emin misiniz ?")) {
// Arayüzden todoları temizleme
// todoList.innerHTML = ""; // Yavaş
while(todoList.firstElementChild != null) {
todoList.removeChild(todoList.firstElementChild);
}
localStorage.removeItem("todos");




}





}
function filterTodos(e){
const filterValue = e.target.value.toLowerCase();
const listItems = document.querySelectorAll(".list-group-item");

listItems.forEach(function(listItem){
const text = listItem.textContent.toLowerCase();
if (text.indexOf(filterValue) === -1){
// Bulamadı

listItem.setAttribute("style","display : none !important");
}
else {
listItem.setAttribute("style","display : block");
}



});

}
function deleteTodo(e){

if (e.target.className === "fa fa-remove"){
e.target.parentElement.parentElement.remove();
deleteTodoFromStorage(e.target.parentElement.parentElement.textContent);

showAlert("success","Todo başarıyla silindi...");

}

}
function deleteTodoFromStorage(deletetodo){
let todos = getTodosFromStorage();

todos.forEach(function(todo,index){
if (todo === deletetodo){
todos.splice(index,1); // Arrayden değeri silebiliriz.
}
});
localStorage.setItem("todos",JSON.stringify(todos));

}
function loadAllTodosToUI(){
let todos = getTodosFromStorage();

todos.forEach(function(todo){
addTodoToUI(todo);


})

}
function addTodo(e){
const newTodo = todoInput.value.trim();

if (newTodo === "") {

showAlert("danger","Lütfen bir todo girin...");
}
else {
addTodoToUI(newTodo);
addTodoToStorage(newTodo);

showAlert("success","Todo başarıyla eklendi...");

}





e.preventDefault();

}
function getTodosFromStorage(){ // Storagedan Todoları Alma
let todos;

if (localStorage.getItem("todos") === null){
todos = [];
}
else {
todos = JSON.parse(localStorage.getItem("todos"));

}
return todos;


}
function addTodoToStorage(newTodo){
let todos = getTodosFromStorage();

todos.push(newTodo);

localStorage.setItem("todos",JSON.stringify(todos));



}
function showAlert(type,message){
const alert = document.createElement("div");

alert.className = `alert alert-${type}`;

alert.textContent = message;

firstCardBody.appendChild(alert);

// setTimeout

setTimeout(function(){
alert.remove();

},1000);



}
function addTodoToUI(newTodo){ // String değerini list item olarak UI'ya ekleyecek.
/*

<li class="list-group-item d-flex justify-content-between">
Todo 1
<a href = "#" class ="delete-item">
<i class = "fa fa-remove"></i>
</a>

</li>
*/
// List Item Oluşturma
const listItem = document.createElement("li");
// Link oluşturma
const link = document.createElement("a");
link.href = "#";
link.className = "delete-item";
link.innerHTML = "<i class = 'fa fa-remove'></i>";

listItem.className = "list-group-item d-flex justify-content-between";

// Text Node Ekleme

listItem.appendChild(document.createTextNode(newTodo));
listItem.appendChild(link);

// Todo List'e List Item'ı ekleme

todoList.appendChild(listItem);
todoInput.value = "";





}



     
 
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