如何根據我們有多少標簽來設定和修改<tr>標簽的data-id屬性-有解無憂

我正在為練習創建一個“費用跟蹤器”。

這需要一個名字、一個日期、一個金額，并將其顯示在桌子上。一切正常。
我添加了一個專案，它的 data-id 為 0，下一個 tr data-id 為 1，下一個 2，下一個 3，依此類推。

但

例如，如果我有 3<tr>并且我按下洗掉按鈕并洗掉一行，然后添加另一個行 data-id，它將是這樣的tr[data-id=1],tr[data-id=2],tr[data-id=2]]

我不知道該怎么辦。

請看一下圖片。洗掉 td 前的 tr attr ---添加新的 td 后的 tr attr

PS：我正在使用 localStorage 存盤表 td 并從中獲取 td 并將其放回表中。我也想洗掉已從 localStorage 中單擊的元素。我需要 tr id。

//
////// Add To The Table
//

const btn = document.getElementById("btn");
btn.addEventListener("click", add);

function add() {
  // Select Elements
  const name = document.getElementById("name").value,
    date = document.getElementById("date").value,
    amount = document.getElementById("amount").value,
    currency = document.getElementById("selector").value;

  // Check if inputs is not empty
  if (
    name.length <= 0 ||
    date.length <= 0 ||
    amount.length <= 0 ||
    currency == "empty"
  )
    return;

  // Create Table
  const newTr = createTr(),
    tdName = createTd(),
    tdDate = createTd(),
    tdAmount = createTd(),
    tdBtn = createTd(),
    deleteBtn = createInput();

  // Set Data Attribute
  const Trs = document.querySelectorAll("tbody > tr");
  newTr.setAttribute("data-id", Trs.length);
  tdName.setAttribute("class", "data");
  tdDate.setAttribute("class", "data");
  tdAmount.setAttribute("class", "data");

  // Create Text Node
  const varName = txtNode(name),
    varDate = txtNode(date),
    varAmount = txtNode(`${amount}${currency}`);

  // Select Parent element for insert
  const table = document.querySelector("table");
  const tbody = document.querySelector("tbody");

  // Creating Delete Button
  deleteBtn.setAttribute("type", "button");
  deleteBtn.setAttribute("value", "X");
  deleteBtn.setAttribute("class", "deleteBtn");
  deleteBtn.addEventListener("click", remover);
  // Add Elements together
  tdName.appendChild(varName);
  tdDate.appendChild(varDate);
  tdAmount.appendChild(varAmount);
  tdBtn.appendChild(deleteBtn);
  newTr.appendChild(tdName);
  newTr.appendChild(tdDate);
  newTr.appendChild(tdAmount);
  newTr.appendChild(tdBtn);
  tbody.appendChild(newTr);
  // Add to the DOM
  table.insertBefore(tbody, null);

  // Add to the Local Storage
  const storeTableTd = document.querySelectorAll("tbody > tr");

  let tableItems = [];
  for (let i = 0; i < storeTableTd.length; i  ) {
    let datas = storeTableTd[i].childNodes;
    let combine = {
      id: i,
      name: datas[0].innerText,
      date: datas[1].innerText,
      amount: datas[2].innerText,
    };
    tableItems.push(combine);
  }
  localStorage.setItem(`table`, JSON.stringify(tableItems));
}
//
////// Delete All Rows
//

const clearBtn = document.getElementById("clear");
clearBtn.addEventListener("click", clear);

function clear() {
  const storeTableRow = document.querySelectorAll("tbody > tr");
  if (storeTableRow.length > 0) {
    for (let i = 0; i < storeTableRow.length; i  ) {
      storeTableRow[i].remove();
    }
  }
  localStorage.clear();
}

//
//////// Restore The Table
//

function restore() {
  const storageTable = JSON.parse(localStorage.table);
  for (let i = 0; i < storageTable.length; i  ) {
    // Create Elements
    const newTr = createTr(),
      createName = createTd(),
      createDate = createTd(),
      createAmount = createTd(),
      createDeleteBtn = createTd(),
      deleteBtn = createInput(),
      textNodeName = txtNode(`${storageTable[i].name}`),
      textNodeDate = txtNode(`${storageTable[i].date}`),
      textNodeAmount = txtNode(`${storageTable[i].amount}`),
      // Select Parent for Insert
      selectBody = document.querySelector("tbody");

    // Set Attributes

    newTr.setAttribute("data-id", `${storageTable[i].id}`);
    deleteBtn.setAttribute("type", "button");
    deleteBtn.setAttribute("value", "X");
    deleteBtn.setAttribute("class", "deleteBtn");

    //TODO Add Delete and Create a Function withit
    createName.appendChild(textNodeName);
    createDate.appendChild(textNodeDate);
    createAmount.appendChild(textNodeAmount);
    createDeleteBtn.appendChild(deleteBtn);
    newTr.appendChild(createName);
    newTr.appendChild(createDate);
    newTr.appendChild(createAmount);
    newTr.appendChild(createDeleteBtn);
    selectBody.insertBefore(newTr, null);
  }
}

// Call Restore function

const storeTd = document.querySelectorAll("td");
if (storeTd.length == 0) {
  if (localStorage.length > 0) {
    restore();
  }
}

// Delete Button Event Listener
let selectAllBtns = document
  .querySelectorAll("input.deleteBtn")
  .forEach((item) => item.addEventListener("click", remover));

function remover(e) {
  // Remove From Local Storage
  const searchId = parseInt(e.path[2].attributes[0].value),
    storageTable = JSON.parse(localStorage.table),
    newLocalStorage = storageTable.filter((obj) => obj.id !== searchId);
  localStorage.setItem("table", JSON.stringify(newLocalStorage));

  // Remove Selected Element
  const tbody = document.querySelector("tbody"),
    elementToRemove = e.path[2];
  tbody.removeChild(elementToRemove);
}

//
////// Show Time and Date
//

// Select the Div
const getDateDiv = document.querySelector("div.date");
const getHourDiv = document.querySelector("div.hour");

function getDate() {
  // Hour
  let newDate = new Date(),
    hour = newDate.getHours(),
    amPm = hour > 12 ? "PM" : "AM",
    tweleHourFormat = hour % 12,
    minuets = newDate.getMinutes(),
    seconds = newDate.getSeconds();

  // Date
  const year = newDate.getFullYear(),
    months = newDate.getMonth()   1,
    day = newDate.getDate();

  // Add Zero to Mineuts and Seconds
  if (minuets < 10) {
    minuets = `0${minuets}`;
  }
  if (seconds < 10) {
    seconds = `0${seconds}`;
  }

  // Add to the Dom
  const date = `${year}/${months}/${day}`;
  const time = `${tweleHourFormat}:${minuets}:${seconds} ${amPm}`;
  getDateDiv.innerHTML = `${date}`;
  getHourDiv.innerHTML = `${time}`;
  setTimeout(getDate, 800);
}

getDate();

//
/////// Create Element Function
//

function createTd() {
  return document.createElement("td");
}

function createTr() {
  return document.createElement("tr");
}

function createInput() {
  return document.createElement("input");
}

function txtNode(node) {
  return document.createTextNode(node);
}

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <link rel="preconnect" href="https://fonts.googleapis.com">

  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
  <link href="https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;1,700&display=swap" rel="stylesheet">
  <link rel="stylesheet" href="style.css">
  <title>Document</title>
</head>

<body>
  <header>
    <section class="dateSection">
      <div class="date"></div>
      <div class="hour"></div>
    </section>
  </header>
  <main class="inputs">
    <section class="texts">
      <h1>Expense Tracker</h1>
      <h2>Add a New Item: </h2>
    </section>
    <section class="form">
      <div class="nameSection">
        <label id='nameLabel'>Name:</label>
        <input type="text" id="name">
      </div>
      <div class="date__amountSection">
        <label id="dateLabel">Date:</label>
        <input type="date" id="date">
        <label id="amountLabel">Amount:</label>
        <input type="text" id="amount">
        <select id="selector" value="Rial">
          <option id="choose" value="empty">Choose</option>
          <option id="dollar" value="$">Dollar</option>
          <option id="rial" value="?">Rial</option>
          <option id="euro" value="€">Euro</option>
          <option id="pound" value="￡">Pound</option>
        </select>
        <div>
    </section>
    <div class="btns">
      <input type="button" class="btns" id="btn" value="Add Expense">
      <input type="button" class="btns" id="clear" value="Clear the List">
    </div>
    <table>
      <thead>
        <tr>
          <th id="headName">Name</th>
          <th id="headDate">Date</th>
          <th id="headAmount">Amount</th>
          <th> </th>
        </tr>
        <tbody></tbody>
      </thead>
    </table>
    <div id="demo"></div>
    </div>
    <script src="script.js"></script>
</body>

</html>

uj5u.com熱心網友回復：

在remover()函式中更新 localStorage 索引

代替

newLocalStorage = storageTable.filter((obj) => obj.id !== searchId);

和

newLocalStorage = storageTable.filter((obj) => obj.id !== searchId)
    .map((obj, index) => {
      obj.id = index;
      return obj
    });

并更新元素data-id

tbody.removeChild(elementToRemove);
// add this lines
document.querySelectorAll("tbody > tr").forEach((item, index) => {
  item.setAttribute("data-id", index)
})

jsfiddle上的演示，

轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/459032.html

標籤：javascript dom javascript 对象

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