How to delete a column from an HTML table using JavaScript?
In HTML, tables are used to display data on a web page in a formatted manner. The table contains columns and rows that display data.
Sometimes, developers need to delete table columns or allow users to delete them. For example, this table contains user data and has "age" and "birthday" columns. In this case we need to remove the "Age" column since we can get the age from the "Birthday" column.
Developers can delete any specific column using deleteCell() method. In this tutorial, we will learn to delete table columns by index, class name and column name. Additionally, developers should remember that table columns are zero-based indexes.
grammar
Users can delete any specific column in the table using the deleteCell() method according to the following syntax.
for (var i = 0; i < rowCount; i++) {
table.rows[i].deleteCell(index);
}
In the above syntax, we iterate over each table row and remove the cell from the "index". Here, ‘index’ is the index of the column to be deleted.
Example 1 (Delete table column by index)
In the example below, we have created a table containing word numbers. Additionally, we style the table by providing borders in CSS. Whenever the user clicks the button, we execute the deleteColumn() function.
In the deleteColumn() function, we use id to access the table. Additionally, we use the "rows" property to get all the rows of the table and use the "length" property of the array to calculate the total number of rows.
We initialize the "index" variable with 2 to delete the third column. After that, we use a for loop to iterate through all the rows of the table. We use the deleteCell() method to delete the third cell in each row.
In the output, the user can click a button to delete the third column from the table.
<html>
<head>
<style>
table {
border-collapse: collapse;
}
td,
th {
border: 1px solid black;
padding: 8px;
}
</style>
</head>
<body>
<h3> Using the <i> deleteCell() method </i> to delete the table columns using JavaScript </h3>
<table id = "test">
<tr>
<th> First </th>
<th> Second </th>
<th> Third </th>
<th> Fourth </th>
</tr>
<tr>
<td> 1 </td>
<td> 2 </td>
<td> 3 </td>
<td> 4 </td>
</tr>
<tr>
<td> 5 </td>
<td> 6 </td>
<td> 7 </td>
<td> 8 </td>
</tr>
<tr>
<td> 9 </td>
<td> 10 </td>
<td> 11 </td>
<td> 12 </td>
</tr>
</table>
<br> <br>
<button onclick = "deleteColumn()"> Delete Column </button>
<script>
function deleteColumn() {
var table = document.getElementById("test");
var rowCount = table.rows.length;
let index = 2;
for (var i = 0; i < rowCount; i++) {
table.rows[i].deleteCell(index);
}
}
</script>
</html>
Example 2 (Deleting table columns by title text)
In the example below, we create a table containing food data. In this example, we delete a table column using header text.
In the deleteColum() function, we access the title of the table. After that we access all header rows. Next, we iterate over the header rows and find the header index that contains "Calories" as the inner HTML.
After finding the column index, we can use a for loop and the tableCell() method to delete specific cells from each row, just like we did in the first example.
In the output, the user should click the button to delete the "Calories" column.
<html>
<head>
<style>
table {border-collapse: collapse;}
td, th {border: 1px solid black; padding: 8px; }
</style>
</head>
<body>
<h3>Using the <i>deleteCell() method</i> to delete the table columns using JavaScript </h3>
<table id="food">
<tr>
<th>Food Name</th>
<th>Price</th>
<th>Calories</th>
</tr>
<tr>
<td>Apple</td>
<td>99</td>
<td>95</td>
</tr>
<tr>
<td>Banana</td>
<td>89</td>
<td>105</td>
</tr>
<tr>
<td>Orange</td>
<td>79</td>
<td>85</td>
</tr>
</table>
<br> <br>
<script>
function deleteColumn() {
// get a table
var table = document.getElementById('food');
// get header row
var headerRow = table.getElementsByTagName('tr')[0];
// get headers
var headers = headerRow.getElementsByTagName('th');
// find column index
for (var i = 0; i < headers.length; i++) {
if (headers[i].innerHTML === "Calories") {
var columnIndex = i;
break;
}
}
// use column index to delete cells
if (columnIndex !== undefined) {
var rowCount = table.rows.length;
for (var i = 0; i < rowCount; i++) {
table.rows[i].deleteCell(columnIndex);
}
}
}
</script>
<button onclick="deleteColumn()">Delete Column</button>
</body>
</html>
Example 3 (Delete multiple table columns by class name)
In the following example, we will learn to delete multiple columns of a table using class names.
Here, we first access all the rows of the table and then iterate over them using a for loop. After that we access all cells of a specific row that contain the "extra" class name. We use a while loop to loop through all cells and remove all cells one by one using "cells[0].parentNode.removeChild(cells[0])".
In the above code, cell[0] is the current cell. "parentNode" refers to its row from which the removeChild() method removes the child node.
In the output, the user can click a button to delete multiple columns from the table.
<html>
<head>
<style>
table { border-collapse: collapse;}
td, th {border: 1px solid black; padding: 8px;}
</style>
</head>
<body>
<h3> Using the <i> deleteCell() method </i> to delete the table columns using JavaScript </h3>
<table id = "HTMLtable">
<tr>
<th> Column 1 </th>
<th class = "extra"> Column 2 </th>
<th >Column 3 </th>
<th class = "extra"> Column 4 </th>
</tr>
<tr>
<td> Row 1, Column 1 </td>
<td class = "extra"> Row 1, Column 2 </td>
<td> Row 1, Column 3 </td>
<td class = "extra"> Row 1, Column 4 </td>
</tr>
<tr>
<td> Row 2, Column 1 </td>
<td class = "extra"> Row 2, Column 2 </td>
<td> Row 2, Column 3 </td>
<td class = "extra"> Row 2, Column 4 </td>
</tr>
<tr>
<td> Row 3, Column 1 </td>
<td class = "extra"> Row 3, Column 2 </td>
<td> Row 3, Column 3 </td>
<td class = "extra"> Row 3, Column 4 </td>
</table> <br> <br>
<button onclick="deleteColumn()"> Delete Column </button>
<script>
function deleteColumn() {
var table = document.getElementById('HTMLtable');
var rows = table.getElementsByTagName('tr');
// iterate through rows
for (var i = 0; i < rows.length; i++) {
// get cells with className 'extra'
var cells = rows[i].getElementsByClassName('extra');
// delete cells
while (cells.length > 0) {
cells[0].parentNode.removeChild(cells[0]);
}
}
}
</script>
</html>
We learned to delete columns from a table using JavaScript. We used the deleteCeil() method in the first 2 examples by passing the column index as a parameter. In the third example, we use the removeChild() method to remove a specific cell.
The above is the detailed content of How to delete a column from an HTML table using JavaScript?. For more information, please follow other related articles on the PHP Chinese website!
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!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1669
14
1428
52
1329
25
1273
29
1256
24
Python vs. JavaScript: The Learning Curve and Ease of Use
Apr 16, 2025 am 12:12 AM
Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.
From C/C to JavaScript: How It All Works
Apr 14, 2025 am 12:05 AM
The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.
JavaScript and the Web: Core Functionality and Use Cases
Apr 18, 2025 am 12:19 AM
The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.
JavaScript in Action: Real-World Examples and Projects
Apr 19, 2025 am 12:13 AM
JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.
Understanding the JavaScript Engine: Implementation Details
Apr 17, 2025 am 12:05 AM
Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.
Python vs. JavaScript: Community, Libraries, and Resources
Apr 15, 2025 am 12:16 AM
Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.
Python vs. JavaScript: Development Environments and Tools
Apr 26, 2025 am 12:09 AM
Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.
The Role of C/C in JavaScript Interpreters and Compilers
Apr 20, 2025 am 12:01 AM
C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.
