javascript table delete second row-Front-end Q&A-php.cn

JavaScript is a programming language widely used in web development. Proficiency in it can make our web pages more interactive and dynamic. One of the common applications is the table deletion function. This article will introduce in detail how to use JavaScript to delete the second row in the table.

1. Basic knowledge of HTML

Before learning JavaScript, we need to master the basic knowledge of HTML tables. HTML tables are defined by

elements, each row is defined by elements, and each column is defined by

elements. The following is an example of a simple HTML table:

<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>

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2. Basic knowledge of JavaScript

In the above HTML code, we can see a table consisting of 3 rows and 3 columns. Adding and deleting rows or columns in a table is a basic operation of HTML tables. The prerequisite for using JavaScript to operate tables is that you must be proficient in the basic knowledge of JavaScript.

In JavaScript, we use the getElementById() method to get the HTML element, where "id" is the unique identifier of the HTML element. The getElementById() method returns a reference to the first object with the specified ID property. Using it we can easily manipulate HTML DOM elements.

In addition, we also need to understand how DOM (Document Object Model) organizes HTML documents. The DOM defines a set of standard methods for retrieving, adding, removing, and modifying HTML elements.

3. JavaScript to delete the second row in the table

Now that we have mastered the basic knowledge of JavaScript and HTML tables, next we will write JavaScript code to delete the second row in the table. second line.

First, we need to create an HTML table:

<table id="myTable">
  <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>

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Next, we need to use JavaScript to get a reference to the table and delete the second row. The specific code is as follows:

var table = document.getElementById("myTable"); //获取表格的引用
table.deleteRow(1); //删除第二行

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.deleteRow() method is used to delete the table row of the specified index. Here, the index of the second row is specified as 1.

4. Complete code

Following the above operations, we can easily delete the second row in the table. The complete code is as follows:




  
  JavaScript删除表格中的第二行



<table id="myTable">
  <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>



<script>
function deleteRow() {
  var table = document.getElementById("myTable");
  table.deleteRow(1);
}
</script>

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5. Summary

Through learning and practice, we have mastered the JavaScript method to delete the second row in the table. JavaScript can not only be used for table operations, but also for handling events, styles, and content of web pages. With in-depth study of JavaScript, we can better grasp the dynamic effects and interaction methods of web pages, and improve the level and quality of web design and development.

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