How to use JavaScript script to modify table information in JSP

In the backend systems of many websites, it is often necessary to use the function of modifying table information. When using JSP technology to complete the table modification operation, using JavaScript scripts can quickly and easily modify the table information. This article will give you a detailed introduction to the specific steps of using JavaScript scripts to modify table information in JSP.

1. Display of table information in JSP

In the JSP page, we can use the following code to display a simple table data:

<table>
    <thead>
        <tr>
            <th>用户名</th>
            <th>邮箱</th>
            <th>电话号码</th>
            <th>操作</th>
        </tr>
    </thead>
    <tbody>
        <%
            //从数据库中获取表格数据
            List<User> userList = userService.getAllUser();
            for(User user:userList){
        %>
        <tr>
            <td><%=user.getName()%></td>
            <td><%=user.getEmail()%></td>
            <td><%=user.getPhone()%></td>
            <td>
                <button onclick="editUser(<%=user.getId()%>)">编辑</button>
                <button onclick="deleteUser(<%=user.getId()%>)">删除</button>
            </td>
        </tr>
        <%}%>
    </tbody>
</table>

The above code is a section Simple JSP code, it will get data from the database and display the data in table form. Among them, each table row is bound to an edit and delete button. The click events of these two buttons will be defined in subsequent steps.

2. JavaScript script to implement table information editing

When the user clicks the edit button in the table, the editUser() function in the JavaScript script will be triggered. We can add the following JS code to the page to implement the definition of this function:

function editUser(userId){
    //获取该行表格的数据
    var tr = document.getElementById(userId).parentNode.parentNode;
    var name = tr.childNodes[0].textContent;
    var email = tr.childNodes[1].textContent;
    var phone = tr.childNodes[2].textContent;

    //将该行表格的数据填充到弹出的编辑表单中
    document.getElementById("edit-user-id").value = userId;
    document.getElementById("edit-user-name").value = name;
    document.getElementById("edit-user-email").value = email;
    document.getElementById("edit-user-phone").value = phone;

    //显示编辑表单
    document.getElementById("edit-user-form").style.display = "block";
}

In the above code, when the user clicks the edit button, the editUser() function will be called. In this function, we first obtain the data of the current row table, including user name, email address and phone number. Next, we fill this data into a pop-up edit form, which is hidden on the page. Finally, we set the edit form to a display state so that users can edit the data.

3. JavaScript script to implement table information deletion

When the user clicks the delete button in the table, the deleteUser() function in the JavaScript script will be triggered. We can add the following JS code to the page to implement the definition of this function:

function deleteUser(userId){
    if(confirm("确认要删除该用户吗？")){
        //向后台发送删除请求
        window.location.href = "deleteUser.jsp?id=" + userId;
    }
}

In the above code, when the user clicks the delete button, the deleteUser() function will be called. In this function, we first pop up a confirmation box to let the user confirm whether they want to delete the user. If the user clicks the confirmation button, then we send a request to the background to delete the user's information.

4. Processing of table information modification in JSP

When the user modifies the data in the table, the modified data needs to be saved to the database. We can use the following JSP code to process table data modifications:

<%
    int userId = Integer.parseInt(request.getParameter("userId"));
    String name = request.getParameter("name");
    String email = request.getParameter("email");
    String phone = request.getParameter("phone");

    userService.updateUser(userId, name, email, phone);

    //跳转回原来的页面
    response.sendRedirect("userList.jsp");
%>

In the above code, we first obtain the information that the user wants to modify from the request parameters, and then call the updateUser() method in userService to update the database. data in. Finally, we redirect the page back to the original page through the response.sendRedirect() method.

In summary, the above are the detailed steps for using JavaScript scripts to modify table information in JSP. By using JavaScript scripts, we can quickly and easily modify and delete table information, providing convenience for the website's backend management system.

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