How to delete data in HTML

In Web development, operating data is one of the most basic and important parts, and data deletion is inevitable. This article will explain how to perform data deletion operations in HTML.

1. Delete button production

In HTML, we usually use buttons to trigger delete operations. First, we need to add a delete button to the page, for example:

<button id="deleteBtn">删除</button>

Among them, we use the id attribute as "deleteBtn", which is to facilitate our operation in JavaScript. Next, we need to add the corresponding delete operation code in JavaScript.

2. Delete operation code

First, in JavaScript, we need to obtain the data that needs to be deleted. For example, we use the id as "data" to represent the data we need to delete. The code is as follows:

<div id="data">
  <!-- 数据内容 -->
</div>

Next, we add the delete operation code:

document.getElementById("deleteBtn").addEventListener("click", function() {
  var data = document.getElementById("data");
  data.parentNode.removeChild(data); // 删除数据
});

In the above code, we use addEventListener The function adds a click event to the delete button. When the button is clicked, the function behind it will be executed. Inside this function, the data that needs to be deleted is first obtained, and then removed from the page through the parentNode and removeChild methods to achieve data deletion.

3. Deletion Confirmation

When performing a data deletion operation, in order to avoid misoperation, it is usually necessary to add a confirmation box to confirm whether the user really needs to delete the data. In HTML, we can use the window.confirm method to implement this function:

document.getElementById("deleteBtn").addEventListener("click", function() {
  if (window.confirm("是否确定删除该数据？")) {
    var data = document.getElementById("data");
    data.parentNode.removeChild(data);
  }
});

In the above code, we added an if statement and used the window.confirm method to pop up a confirmation box. When the user confirms the deletion , the deletion operation will be executed.

IV. Summary

This article introduces how to perform data deletion operations in HTML, mainly involving the production of delete buttons, the implementation of deletion operation codes, and the addition of deletion confirmation functions. Hope this article can help you understand the data removal operation in HTML.

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