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向通過php / html腳本生成的按鈕添加功能

[英]Adding functionality to buttons generated via a php/html script

 原文  2019-02-27 06:44:44  5   2    php/ html/ mysql/ sql/ mysqli

問題描述

我對PHP / HTML / CSS編程非常陌生，在下面所附的代碼中，我試圖創建網站管理面板的基本功能。

我想做的是打印出帶有所有行和列的表，並增加一個帶有控件的列，該控件將允許我從數據庫中刪除該行。 最終，我想為每個用戶更改名稱，密碼和管理員特權。

另外，我真的不知道如何使每個按鈕保持一個將其連接到其相應行的值。

也許由於我是一位經驗不足的程序員，我的所有嘗試都失敗了或刪除了最后一行（也許因為它是$email變量名下的最后一個值）。 一位朋友建議使用JavaScript或遷移到其他平台（他的建議是Angular JS）以實現我的目標，但到目前為止，我真的想使用PHP使其保持簡單（如果確實如此）和CSS。

這是管理面板的圖像：

單擊此處查看丑陋的管理面板。

這是我的表生成器（或者與我設法得到的一樣好）： 

<?php
    include "connection.php"; 

    $sql = "SELECT * FROM users;";
    $result = $conn->query($sql);

    if ($result->num_rows > 0) 
    {
        echo "<table class='sqltable'>
                <tr class='sqltable'>
                    <th class='sqltable'>ID</th>
                    <th class='sqltable'>EMAIL</th>
                    <th class='sqltable'>NAME</th>
                    <th class='sqltable'>IS ADMIN</th>
                    <th class='sqltable'>PASSWORD</th>
                    <th class='sqltable'>CONTROLS</th>
                </tr>";

        // output data of each row
        while($row = $result->fetch_assoc()) 
        {
            echo "<tr class='sqltable'>                            
                    <td class='sqlcell'>".$row["ID"]."</td>
                    <td class='sqlcell'>".$row["EMAIL"]."</td>
                    <td class='sqlcell'>".$row["FIRST_NAME"]." ".$row["MID_NAME"]." ".$row["LAST_NAME"]."</td>
                    <td class='sqlcell'>".$row["IS_ADMIN"]."</td> 
                    <td class='sqlcell'>".$row["PASSWORD"]."</td>
                    <td class='sqlcell'>
                        <center>
                            <div style='border: 1px solid lightgray;' method='POST'>
                                <input type='hidden' name='ID' value='".$row['ID']." '/>
                                <input type='button' name='delete' value='DEL ".$row['ID']." '/>
                            </div>
                        </center>
                    </td>
                </tr>";
        } 
        echo "</table>";
    }

    else 
    {
        echo "DATABASE IS EMPTY!";
    }  

    $conn->close(); 

    if (isset($_POST['delete']))
    { //if a delete request received
        $id = $_POST['id']; //primary key of this row

        /////// Connectivity /////////
        $servername = "127.0.0.1";
        $username = "root";
        $password = ""; 
        $db = "myDB";    

        // Create connection
        $conn = new mysqli($servername, $username, $password, $db);

        //check connection
        if ($conn)
        {
            printf("Connect failed: %s\n", mysqli_connect_error());
            exit();
        }

        //compose sql statement
        $stmt = mysqli_prepare($conn, "DELETE FROM users WHERE ID=?");

        mysqli_stmt_bind_param($stmt,'i',$id); //now add the $id to the statement 'i' stands for integer

        mysqli_stmt_execute($stmt);

        mysqli_stmt_close($stmt);
        mysqli_close($conn); //connection closed
    }
?>

這就是我開始做的事情，而且我已經很確定自己走了錯誤的路線。 

function delete()
            {
                $del = "DELETE FROM '".$table."' WHERE EMAIL='".$email."';";
                $conn->query($del);
            }

2 個解決方案

解決方案1
 0  2019-02-27 08:07:27

好吧，首先，php腳本是服務器端腳本，這意味着您的按鈕不會觸發刪除功能，或者，它將向存在刪除操作的服務器發送請求。

怎么做？ 只需在要顯示刪除按鈕的表格單元內呈現一個表單（即html元素），然后將方法定義為post（了解有關http請求方法的更多信息），然后可以包含id值（或該表的主鍵）。 

 <form method="post">
 <input type='submit' name='delete' />
 <input type='hidden' name="id" value="$row['id']" />
 </form>

因此此表單告訴瀏覽器：每當用戶單擊“刪除”按鈕時，提交包含一個隱藏輸入的此表單，其中包含要刪除的元素的ID。

現在我們去服務器端，在文件的開頭： 

<?php 
if (isset($_POST['delete'])){ //if a delete request received
$id = $_POST['id']; //primary key of this row

//establish connection to mysql
$mysqli = new mysqli('localhost', 'my_user', 'my_password', 'world');

//check connection
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

//compose sql statement
$stmt = $mysqli->prepare("DELETE FROM users WHERE ID=?");

$stmt->bind_param('i',$id); //now add the $id to the statement 'i' stands for integer

$stmt->execute();

$stmt->close();
$mysqli->close() //connection closed
}
?>

上面的代碼以OOP編寫，也可以以過程樣式編寫。 

<?php 
if (isset($_POST['delete'])){ //if a delete request received
$id = $_POST['id']; //primary key of this row

//establish connection to mysql
$mysqli = mysqli_connect('localhost', 'my_user', 'my_password', 'world');

//check connection
if (!$mysqli) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

//compose sql statement
$stmt = mysqli_prepare($mysqli, "DELETE FROM users WHERE ID=?");

mysqli_stmt_bind_param($stmt,'i',$id); //now add the $id to the statement 'i' stands for integer

mysqli_stmt_execute($stmt);

mysqli_stmt_close($stmt);
mysqli_close($mysqli) //connection closed
}
?>
  1. 有關綁定參數的更多信息
  2. HTTP方法

解決方案2
 0 已采納  2019-03-01 07:58:50

現在，當我實現問題中發布的代碼時，我做了幾處更改以使其正常運行，所有小問題，將在此處進行詳細說明。 

<?php
    if (isset($_POST['delete'])) //first: test if any delete request, delete and then render the table 
    { //if a delete request received
        $id = $_POST['id']; //primary key of this row, where 'id' index must be case-sensitively equal to the hidden input name 'id'

        /////// Connectivity /////////
        $servername = "localhost";
        $username = "root";
        $password = "root"; 
        $db = "user_delete";    

        // Create connection (procedural style)
        $conn = mysqli_connect($servername, $username, $password, $db);

        //check connection
        if (!$conn) //if NOT connected
        {
            printf("Connect failed: %s\n", mysqli_connect_error()); //print error
            exit(); //exit the program 'in this case you wouldn't see the table either'
        }

        //compose sql statement
        $stmt = mysqli_prepare($conn, "DELETE FROM users WHERE ID=?"); //notice that sql statements are NOT case sensitive

        mysqli_stmt_bind_param($stmt,'i',$id); //now add the $id to the statement 'i' stands for integer

        mysqli_stmt_execute($stmt);

        mysqli_stmt_close($stmt);
        mysqli_close($conn); //connection closed, row deleted
    }

    include "connection.php"; 

    $sql = "SELECT * FROM users;";
    $result = $conn->query($sql);

    if ($result->num_rows > 0) 
    {
        echo "<table class='sqltable'>
                <tr class='sqltable'>
                    <th class='sqltable'>ID</th>
                    <th class='sqltable'>EMAIL</th>
                    <th class='sqltable'>NAME</th>
                    <th class='sqltable'>IS ADMIN</th>
                    <th class='sqltable'>PASSWORD</th>
                    <th class='sqltable'>CONTROLS</th>
                </tr>";

        // output data of each row
        while($row = $result->fetch_assoc()) 
        {
            echo "<tr class='sqltable'>";
            echo   "<td class='sqlcell'>".$row["id"]."</td>";   //php is case-sensitive so you should use $row['ID'] according to your scheme
            echo   "<td class='sqlcell'>".$row["email"]."</td>";//php is case-sensitive so you should use $row['EMAIL'] according to your scheme
            echo   "<td class='sqlcell'>".$row["name"]."</td>";//for simplicity, I made one field, change it according to your scheme
            echo   "<td class='sqlcell'>".$row["is_Admin"]."</td>";//php is case-sensitive so you should use $row['IS_ADMIN'] according to your scheme
            echo   "<td class='sqlcell'>".$row["password"]."</td>";//same as above
            echo    "<td class='sqlcell'>
                        <center>
                            <div style='border: 1px solid lightgray;'>";
                    echo    "<form method='POST'>"; //must be added in a form with method=post
                    echo        "<input type='hidden' name='id' value='".$row['id']." '/>"; //differntiate between input name `id` and mysql field name you have `ID`, input field name is the index you will fetch in line 4: $_POST['id']
                    echo        "<input type='submit' name='delete' value='DEL ".$row['id']." '/>"; //type: submit, not button
                    echo    "</form>
                            </div>
                        </center>
                    </td>
                </tr>";
        } 
        echo "</table>";
    }

    else 
    {
        echo "DATABASE IS EMPTY!";
    }  
//all done
    $conn->close(); 
?>

更新：現在這是相同的代碼，全部是OOP樣式並重新使用連接： 

<?php
    include "connection.php"; 
    if (isset($_POST['delete'])) //first: test if any delete request, delete and then render the table 
    { //if a delete request received
        $id = $_POST['id']; //primary key of this row, where 'id' index must be case-sensitivly equal to the hidden input name 'id'

        //check connection
        if (mysqli_connect_errno()) //if connection error existed
        {
            printf("Connect failed: %s\n", mysqli_connect_error()); //print error
            exit(); //exit the program 'in this case you wouldn't see the table either'
        }

        //compose sql statement
        $stmt = $conn->prepare("DELETE FROM users WHERE ID=?"); //notice that sql statements are NOT case sensitive

        $stmt->bind_param('i',$id); //now add the $id to the statement 'i' stands for integer

        $stmt->execute();

        $stmt->close();
    }

    $sql = "SELECT * FROM users;";
    $result = $conn->query($sql);

    if ($result->num_rows > 0) 
    {
        echo "<table class='sqltable'>
                <tr class='sqltable'>
                    <th class='sqltable'>ID</th>
                    <th class='sqltable'>EMAIL</th>
                    <th class='sqltable'>NAME</th>
                    <th class='sqltable'>IS ADMIN</th>
                    <th class='sqltable'>PASSWORD</th>
                    <th class='sqltable'>CONTROLS</th>
                </tr>";

        // output data of each row
        while($row = $result->fetch_assoc()) 
        {
            echo "<tr class='sqltable'>";
            echo   "<td class='sqlcell'>".$row["id"]."</td>";   //php is case-sensitive so you should use $row['ID'] according to your scheme
            echo   "<td class='sqlcell'>".$row["email"]."</td>";//php is case-sensitive so you should use $row['EMAIL'] according to your scheme
            echo   "<td class='sqlcell'>".$row["name"]."</td>";//for simplicity, I made one field, change it according to your scheme
            echo   "<td class='sqlcell'>".$row["is_Admin"]."</td>";//php is case-sensitive so you should use $row['IS_ADMIN'] according to your scheme
            echo   "<td class='sqlcell'>".$row["password"]."</td>";//same as above
            echo    "<td class='sqlcell'>
                        <center>
                            <div style='border: 1px solid lightgray;'>";
                    echo    "<form method='POST'>"; //must be added in a form with method=post
                    echo        "<input type='hidden' name='id' value='".$row['id']." '/>"; //differntiate between input name `id` and mysql field name you have `ID`, input field name is the index you will fetch in line 4: $_POST['id']
                    echo        "<input type='submit' name='delete' value='DEL ".$row['id']." '/>"; //type: submit, not button
                    echo    "</form>
                            </div>
                        </center>
                    </td>
                </tr>";
        } 
        echo "</table>";
    }

    else 
    {
        echo "DATABASE IS EMPTY!";
    }  
//all done
    $conn->close(); 
?>

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