How to print a table in Javascript

As a scripting language that is executed directly in the browser, JavaScript can dynamically generate, insert and modify content in HTML pages. Tables are one of the common ways to display data in Web pages, and JavaScript's powerful ability to manipulate DOM allows us to dynamically generate and operate tables in HTML pages. This article will introduce how to create a table in JavaScript.

The basic structure of HTML tables

Before introducing how to use JavaScript to print tables, let’s first review the basic structure of HTML tables.

HTML tables usually consist of three elements: table, tr and td. Among them, table (table) is a whole, used to contain the entire table, tr (row) represents a row in the table, and td (cell) represents a cell in the table.

The following is a simple HTML table example:

<table>
  <tr>
    <td>姓名</td>
    <td>年龄</td>
    <td>性别</td>
  </tr>
  <tr>
    <td>张三</td>
    <td>25</td>
    <td>男</td>
  </tr>
  <tr>
    <td>李四</td>
    <td>30</td>
    <td>女</td>
  </tr>
</table>

Use JavaScript to dynamically generate tables

In JavaScript, we can create tables, rows, and cell elements, and Add them to the document to dynamically generate tables.

Create a table

We can use the document.createElement() method to create a table element object:

var table = document.createElement('table');

Create rows and cells

Use table. The insertRow() method can create a new row object in the table, and the row.insertCell() method can be used to create a cell object in the row.

The following is an example of dynamically creating a table, which uses JavaScript to generate a table with 3 rows and 3 columns:

var table = document.createElement('table');
for (var i = 0; i < 3; i++) {
  var row = table.insertRow();
  for (var j = 0; j < 3; j++) {
    var cell = row.insertCell();
    cell.innerHTML = i + "," + j;
  }
}
document.body.appendChild(table);

In the above code, we first create a table element object and pass The loop creates a table with 3 rows and 3 columns. In each loop, we create a new row object using the insertRow() method, create a new cell object using the insertCell() method, and add the cell object to the row. Then, we fill in each cell with data through the innerHTML attribute, and finally add the entire table to the document.

Modify the table style

We can use the element.style property and CSS style property to modify the style of the table.

The following is an example of modifying the table style, which uses JavaScript to dynamically generate a table with background color and border:

var table = document.createElement('table');
table.style.backgroundColor = '#eee';
table.style.border = '1px solid #000';

for (var i = 0; i < 3; i++) {
  var row = table.insertRow();
  for (var j = 0; j < 3; j++) {
    var cell = row.insertCell();
    cell.innerHTML = i + "," + j;
    cell.style.border = '1px solid #000';
    cell.style.padding = '10px';
  }
}
document.body.appendChild(table);

In the above code, we use table.style.backgroundColor and table.style.border properties to set the background color and border style of the table. Then we set borders and padding on each cell as well to make it look nicer.

Summary

Tables are one of the common UI elements in web applications. We can use JavaScript to dynamically generate and manipulate tables. In this article, we covered how to create, modify, and manipulate tables using JavaScript. I hope this article helped you better understand JavaScript and HTML tables.

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