How to create a delete dialog in PHP

When developing web applications, in many cases we need to perform some operations, such as deleting an element. This operation is easy to implement if there is only a delete button. However, if there are many delete buttons and we want the user to confirm, a delete dialog box is very useful.

In this article, we will introduce how to create a delete dialog box in PHP.

Step 1: Create a delete button

First, let us create a delete button to trigger the delete dialog box. We create a button using HTML code as follows:

<button onclick="showDeleteDialog()">删除</button>

The onclick event of this button will call the JavaScript function showDeleteDialog(). We will implement this function in JavaScript later.

Step 2: Implement the delete dialog box

We use JavaScript and HTML code to create a delete dialog box, as shown below:

<div id="deleteDialog" style="display:none">
  <p>你确定要删除吗？</p>
  <button onclick="deleteElement()">确定</button>
  <button onclick="hideDeleteDialog()">取消</button>
</div>

This delete dialog box consists of a paragraph and Consists of two buttons. One button is used to confirm the deletion and the other button is used to cancel the deletion. The ID of the dialog box is "deleteDialog", and the initial state is hidden.

Step 3: Implement the JavaScript function

Now, we need to implement the JavaScript function to display the delete dialog box when the user clicks the delete button. We write the showDeleteDialog() function in JavaScript code as follows:

function showDeleteDialog(){
  document.getElementById("deleteDialog").style.display = "block";
}

This function obtains the "deleteDialog" element through the getElementById() method and sets its display attribute to "block" so that the dialog box will be displayed. .

Step 4: Implement the deleteElement() function

After the user confirms the deletion, we need to perform the actual deletion operation. We implement the deleteElement() function through JavaScript and PHP code, as shown below:

function deleteElement(){
  // 获取要删除的元素ID
  var elementID = "elementID";

  // 发送HTTP请求
  var xhr = new XMLHttpRequest();
  xhr.open("POST", "delete.php", true);
  xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  xhr.onreadystatechange = function(){
    if(xhr.readyState == 4 && xhr.status == 200){
      // 删除成功，隐藏对话框
      hideDeleteDialog();
    }
  };
  xhr.send("id=" + elementID);
}

This function sends the ID of the element to be deleted to the PHP script on the server through the HTTP POST method. When the PHP script successfully deletes the element, the function will call the hideDeleteDialog() function to hide the delete dialog box.

Step 5: Implement the hideDeleteDialog() function

Finally, we need to implement the function to hide the delete dialog box. We write the hideDeleteDialog() function in JavaScript code as follows:

function hideDeleteDialog(){
  document.getElementById("deleteDialog").style.display = "none";
}

This function gets the "deleteDialog" element through the getElementById() method and sets its display attribute to "none" so that the dialog box will be hidden. .

So far, we have completed all the steps to create a delete dialog box in PHP. We use HTML code to create a delete button that triggers the delete dialog box. Implement the showDeleteDialog() function through JavaScript code to display the delete dialog box. After the user clicks to confirm the deletion, we perform the actual deletion operation through the deleteElement() function and call the hideDeleteDialog() function to hide the deletion dialog box.

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