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How to write a table in javascript

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May 12, 2023 pm 08:09 PM

In front-end development, tables are one of the most common elements. JavaScript can be used to dynamically generate tables, which facilitates our control and operation of tables. Here are some common methods and techniques to help you better write JavaScript tables.

Creation and modification of basic tables

The table is composed of HTML tags

, , , , < ;tr>,

and	. If you want to create a table dynamically, you can generate the table by adding these tags. The following is a simple example: <table id="myTable"> <thead> <tr> <th>Name</th> <th>Age</th> <th>City</th> </tr> </thead> <tbody> <tr> <td>John</td> <td>25</td> <td>New York</td> </tr> <tr> <td>Jane</td> <td>30</td> <td>Los Angeles</td> </tr> </tbody> </table> Copy after login After creating the table, you can modify the table. For example, you can add new rows and columns: var table = document.getElementById("myTable"); var row = table.insertRow(2); var cell1 = row.insertCell(0); var cell2 = row.insertCell(1); var cell3 = row.insertCell(2); cell1.innerHTML = "Bob"; cell2.innerHTML = "40"; cell3.innerHTML = "Chicago"; Copy after login The above code adds a new row to the table and fills in the information in each cell. Generate tables based on data In actual development, we may need to dynamically generate tables based on some data. Suppose we have a JSON array that contains some student information, then we can dynamically generate a table by traversing the array. The following is an example: var students = [ {name: "John", age: 25, city: "New York"}, {name: "Jane", age: 30, city: "Los Angeles"}, {name: "Bob", age: 40, city: "Chicago"} ]; var table = document.createElement("table"); var thead = document.createElement("thead"); var tbody = document.createElement("tbody"); var tr = document.createElement("tr"); for (var key in students[0]) { var th = document.createElement("th"); th.innerHTML = key.charAt(0).toUpperCase() + key.slice(1); tr.appendChild(th); } thead.appendChild(tr); table.appendChild(thead); for (var i = 0; i < students.length; i++) { var tr = document.createElement("tr"); for (var key in students[i]) { var td = document.createElement("td"); td.innerHTML = students[i][key]; tr.appendChild(td); } tbody.appendChild(tr); } table.appendChild(tbody); document.body.appendChild(table); Copy after login The above code first creates a DOM element containing a table, and then creates the table header and table body respectively. During the process of traversing the JSON array, elements are added row by row according to the format of the table header and table body. It should be noted that the bold part in the code is used to capitalize the first letter of each key. Table sorting Table sorting is one of the most common operations. Table sorting can be achieved through JavaScript. The following is an example: function sortTable(n) { var table, rows, switching, i, x, y, shouldSwitch, dir, switchcount = 0; table = document.getElementById("myTable"); switching = true; dir = "asc"; while (switching) { switching = false; rows = table.rows; for (i = 1; i < (rows.length - 1); i++) { shouldSwitch = false; x = rows[i].getElementsByTagName("td")[n]; y = rows[i + 1].getElementsByTagName("td")[n]; if (dir == "asc") { if (x.innerHTML.toLowerCase() > y.innerHTML.toLowerCase()) { shouldSwitch = true; break; } } else if (dir == "desc") { if (x.innerHTML.toLowerCase() < y.innerHTML.toLowerCase()) { shouldSwitch = true; break; } } } if (shouldSwitch) { rows[i].parentNode.insertBefore(rows[i + 1], rows[i]); switching = true; switchcount ++; } else { if (switchcount == 0 && dir == "asc") { dir = "desc"; switching = true; } } } } Copy after login The above code implements a function that sorts by a certain column of the table. The parameter n passed in represents the number of columns to be sorted. Table filtering Table filtering is also a common operation. Data in the table can be filtered through JavaScript. The following is an example: function filterTable() { var input, filter, table, tr, td, i, txtValue; input = document.getElementById("myInput"); filter = input.value.toUpperCase(); table = document.getElementById("myTable"); tr = table.getElementsByTagName("tr"); for (i = 0; i < tr.length; i++) { td = tr[i].getElementsByTagName("td")[0]; if (td) { txtValue = td.textContent \|\| td.innerText; if (txtValue.toUpperCase().indexOf(filter) > -1) { tr[i].style.display = ""; } else { tr[i].style.display = "none"; } } } } Copy after login The above code implements a function that filters table data based on the value in the input box. By getting the value in the user input box, and then traversing the content of each cell in the table, if the content contains the value entered by the user, the row of data is retained, otherwise it is hidden. To sum up, the above are some commonly used JavaScript codes to help you control and operate tables more conveniently. Of course, in actual development, there are more techniques and methods, and I hope you can explore and try them more. The above is the detailed content of How to write a table in javascript. For more information, please follow other related articles on the PHP Chinese website! Statement of this Website The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn Hot AI Tools Undresser.AI Undress AI-powered app for creating realistic nude photos AI Clothes Remover Online AI tool for removing clothes from photos. Undress AI Tool Undress images for free Clothoff.io AI clothes remover Video Face Swap Swap faces in any video effortlessly with our completely free AI face swap tool! 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React and the Frontend: Building Interactive Experiences Apr 11, 2025 am 12:02 AM React is the preferred tool for building interactive front-end experiences. 1) React simplifies UI development through componentization and virtual DOM. 2) Components are divided into function components and class components. Function components are simpler and class components provide more life cycle methods. 3) The working principle of React relies on virtual DOM and reconciliation algorithm to improve performance. 4) State management uses useState or this.state, and life cycle methods such as componentDidMount are used for specific logic. 5) Basic usage includes creating components and managing state, and advanced usage involves custom hooks and performance optimization. 6) Common errors include improper status updates and performance issues, debugging skills include using ReactDevTools and Excellent React Components: Creating Reusable Elements in HTML Apr 08, 2025 pm 05:53 PM React components can be defined by functions or classes, encapsulating UI logic and accepting input data through props. 1) Define components: Use functions or classes to return React elements. 2) Rendering component: React calls render method or executes function component. 3) Multiplexing components: pass data through props to build a complex UI. The lifecycle approach of components allows logic to be executed at different stages, improving development efficiency and code maintainability. Frontend Development with React: Advantages and Techniques Apr 17, 2025 am 12:25 AM The advantages of React are its flexibility and efficiency, which are reflected in: 1) Component-based design improves code reusability; 2) Virtual DOM technology optimizes performance, especially when handling large amounts of data updates; 3) The rich ecosystem provides a large number of third-party libraries and tools. By understanding how React works and uses examples, you can master its core concepts and best practices to build an efficient, maintainable user interface. React's Ecosystem: Libraries, Tools, and Best Practices Apr 18, 2025 am 12:23 AM The React ecosystem includes state management libraries (such as Redux), routing libraries (such as ReactRouter), UI component libraries (such as Material-UI), testing tools (such as Jest), and building tools (such as Webpack). These tools work together to help developers develop and maintain applications efficiently, improve code quality and development efficiency. React vs. Backend Frameworks: A Comparison Apr 13, 2025 am 12:06 AM React is a front-end framework for building user interfaces; a back-end framework is used to build server-side applications. React provides componentized and efficient UI updates, and the backend framework provides a complete backend service solution. When choosing a technology stack, project requirements, team skills, and scalability should be considered. 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and

. If you want to create a table dynamically, you can generate the table by adding these tags.

The following is a simple example:

<table id="myTable">
  <thead>
    <tr>
      <th>Name</th>
      <th>Age</th>
      <th>City</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>John</td>
      <td>25</td>
      <td>New York</td>
    </tr>
    <tr>
      <td>Jane</td>
      <td>30</td>
      <td>Los Angeles</td>
    </tr>
  </tbody>
</table>

Copy after login

After creating the table, you can modify the table. For example, you can add new rows and columns:

var table = document.getElementById("myTable");
var row = table.insertRow(2);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
cell1.innerHTML = "Bob";
cell2.innerHTML = "40";
cell3.innerHTML = "Chicago";

Copy after login

The above code adds a new row to the table and fills in the information in each cell.

Generate tables based on data

In actual development, we may need to dynamically generate tables based on some data. Suppose we have a JSON array that contains some student information, then we can dynamically generate a table by traversing the array.

The following is an example:

var students = [
  {name: "John", age: 25, city: "New York"},
  {name: "Jane", age: 30, city: "Los Angeles"},
  {name: "Bob", age: 40, city: "Chicago"}
];
var table = document.createElement("table");
var thead = document.createElement("thead");
var tbody = document.createElement("tbody");
var tr = document.createElement("tr");
for (var key in students[0]) {
  var th = document.createElement("th");
  th.innerHTML = key.charAt(0).toUpperCase() + key.slice(1);
  tr.appendChild(th);
}
thead.appendChild(tr);
table.appendChild(thead);
for (var i = 0; i < students.length; i++) {
  var tr = document.createElement("tr");
  for (var key in students[i]) {
    var td = document.createElement("td");
    td.innerHTML = students[i][key];
    tr.appendChild(td);
  }
  tbody.appendChild(tr);
}
table.appendChild(tbody);
document.body.appendChild(table);

Copy after login

The above code first creates a DOM element containing a table, and then creates the table header and table body respectively. During the process of traversing the JSON array, elements are added row by row according to the format of the table header and table body.

It should be noted that the bold part in the code is used to capitalize the first letter of each key.

Table sorting

Table sorting is one of the most common operations. Table sorting can be achieved through JavaScript.

The following is an example:

function sortTable(n) {
  var table, rows, switching, i, x, y, shouldSwitch, dir, switchcount = 0;
  table = document.getElementById("myTable");
  switching = true;
  dir = "asc";
  while (switching) {
    switching = false;
    rows = table.rows;
    for (i = 1; i < (rows.length - 1); i++) {
      shouldSwitch = false;
      x = rows[i].getElementsByTagName("td")[n];
      y = rows[i + 1].getElementsByTagName("td")[n];
      if (dir == "asc") {
        if (x.innerHTML.toLowerCase() > y.innerHTML.toLowerCase()) {
          shouldSwitch = true;
          break;
        }
      } else if (dir == "desc") {
        if (x.innerHTML.toLowerCase() < y.innerHTML.toLowerCase()) {
          shouldSwitch = true;
          break;
        }
      }
    }
    if (shouldSwitch) {
      rows[i].parentNode.insertBefore(rows[i + 1], rows[i]);
      switching = true;
      switchcount ++;
    } else {
      if (switchcount == 0 && dir == "asc") {
        dir = "desc";
        switching = true;
      }
    }
  }
}

Copy after login

The above code implements a function that sorts by a certain column of the table. The parameter n passed in represents the number of columns to be sorted.

Table filtering

Table filtering is also a common operation. Data in the table can be filtered through JavaScript.

The following is an example:

function filterTable() {
  var input, filter, table, tr, td, i, txtValue;
  input = document.getElementById("myInput");
  filter = input.value.toUpperCase();
  table = document.getElementById("myTable");
  tr = table.getElementsByTagName("tr");
  for (i = 0; i < tr.length; i++) {
    td = tr[i].getElementsByTagName("td")[0];
    if (td) {
      txtValue = td.textContent || td.innerText;
      if (txtValue.toUpperCase().indexOf(filter) > -1) {
        tr[i].style.display = "";
      } else {
        tr[i].style.display = "none";
      }
    }
  }
}

Copy after login

The above code implements a function that filters table data based on the value in the input box. By getting the value in the user input box, and then traversing the content of each cell in the table, if the content contains the value entered by the user, the row of data is retained, otherwise it is hidden.

To sum up, the above are some commonly used JavaScript codes to help you control and operate tables more conveniently. Of course, in actual development, there are more techniques and methods, and I hope you can explore and try them more.

The above is the detailed content of How to write a table in javascript. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

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