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php - 当表单字段为空时如何停止上传图像

转载 作者：行者123 更新时间：2023-11-29 20:18:35 25 4
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我创建了一个后端表单，允许我上传图像并将值输入表单字段。如果任何表单字段为空，则在尝试上传图像时，空表单字段旁边应显示一条错误消息。在所有表单字段都包含值之前，图像应该无法上传。由于某种原因，在单击添加按钮之前，错误消息不会显示到字段。我不希望必需的唯一表单字段是链接表单字段。如果表单字段为空，如何停止上传图像？

这是index.php的代码:

<!DOCTYPE html>
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>

<?php
// define variables and set to empty values

$nameErr = $videoErr = $LinkErr = $captionErr = "";

$name = $video = $Link = $caption = "";

//if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (empty($_POST["name"])) {
    $nameErr = "Name is required";
  } else {
    $name = test_input($_POST["name"]);
  }

  if (empty($_POST["video"])) {
    $videoErr = "video is required";
  } else {
    $video = test_input($_POST["video"]);
  }

  if (empty($_POST["Link"])) {
    $Link = "";
  } else {
    $Link = test_input($_POST["Link"]);
  }



  if (empty($_POST["caption"])) {
    $captionErr = "caption is required";
  } else {
    $caption = test_input($_POST["caption"]);
  }


function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
?>

<h2>Upload porn thumbnail and video</h2>
<p><span class="error">* required field.</span></p>
  <form enctype="multipart/form-data" method="post" action="insert.php">
  <label for="video">Name:</label>
    <input type="text" id="name" name="name" value="<?php if (!empty($name)) echo $name; ?>" />
    <span class="error">* <?php echo $nameErr;?></span><br><br>
    <label for="video">Video:</label>
    <input type="text" id="video" name="video" value="<?php if (!empty($video)) echo $video; ?>" />
    <span class="error">* <?php echo $videoErr;?></span><br><br>
    <label for="Link">Link:</label>
    <input type="text" id="Link" name="Link" value="<?php if (!empty($Link)) echo $Link; ?>" />
    <span class="error"> <?php echo $LinkErr;?></span><br><br>
    <label for="Caption">Caption:</label>
    <input type="text" id="caption" name="caption" value="<?php if (!empty($caption)) echo $caption; ?>" />
    <span class="error">* <?php echo $captionErr;?></span><br><br>
    <label for="image">Image:</label>
    <input type="file" id="image" name="image" />

    <input type="submit" value="Add" name="submit" />
  </form>





</body>
</html>

这是 insert.php 的代码:

<?php
require_once('appvars.php');

$servername = "localhost";
$username = "root";
$password = "";

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

// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

if(!mysqli_select_db($conn,'image_display'))
{
echo 'Database not selected';
}

    @$name = mysqli_real_escape_string($conn, trim($_POST['name']));
    $caption = mysqli_real_escape_string($conn, trim($_POST['caption']));
    $Link = mysqli_real_escape_string($conn, trim($_POST['Link']));
    $video = mysqli_real_escape_string($conn, trim($_POST['video']));
    $image = mysqli_real_escape_string($conn, trim($_FILES['image']['name']));
    $image_type = $_FILES['image']['type'];
    $image_size = $_FILES['image']['size']; 



if (!empty($caption) && !empty($image)) {
      if ((($image_type == 'image/gif') || ($image_type == 'image/jpeg') || ($image_type == 'image/pjpeg') || ($image_type == 'image/png'))
        && ($image_size > 0) && ($image_size <= TN_MAXFILESIZE)) {
        if ($_FILES['image']['error'] == 0) {
          // Move the file to the target upload folder
          $target = TN_UPLOADPATH . $image;
          if (move_uploaded_file($_FILES['image']['tmp_name'], $target)) {
            // Write the data to the database
            @$query = "INSERT INTO table1(image1,name,imagelink,caption,video) VALUES ('$image', '$name', '$link', '$caption', '$video')";
            mysqli_query($conn, $query);

            // Confirm success with the user
            echo '<p>Thanks for adding your new image</p>';
            //echo '<p><strong>Name:</strong> ' . $name . '<br />';
            //echo '<strong>Score:</strong> ' . $score . '<br />';
            echo '<img src="' . TN_UPLOADPATH . $image . '" alt="" /></p>';
            echo '<p><a href="index.php">&lt;&lt; Back to page</a></p>';

            // Clear  form
            $name = "";
            $caption = "";
            $Link = "";
            $video = "";
            $image = "";

            mysqli_close($conn);
          }
          else {
            echo '<p class="error">Sorry, there was a problem uploading your screen shot image.</p>';
          }
        }
      }
      else {
        echo '<p class="error">The screen shot must be a GIF, JPEG, or PNG image file no greater than ' . (TN_MAXFILESIZE / 1024) . ' file size is too big.</p>';
      }

      // Try to delete the temporary image file
      @unlink($_FILES['image']['tmp_name']);
    }
    else {
      echo '<p class="error">Please enter all of the information to add file.</p>';
    }



?>

最佳答案

必须在 insert.php 中进行验证，将验证代码移到 insert.php 上，只有验证通过后才上传。

<?php
 // define variables and set to empty values

 $nameErr = $videoErr = $LinkErr = $captionErr = "";

 $name = $video = $Link = $caption = "";

//if ($_SERVER["REQUEST_METHOD"] == "POST") {
 if (empty($_POST["name"])) {
$nameErr = "Name is required";
 } else {
  $name = test_input($_POST["name"]);
 }

 if (empty($_POST["video"])) {
 $videoErr = "video is required";
} else {
 $video = test_input($_POST["video"]);
}

if (empty($_POST["Link"])) {
  $Link = "";
} else {
  $Link = test_input($_POST["Link"]);
}



if (empty($_POST["caption"])) {
 $captionErr = "caption is required";
} else {
 $caption = test_input($_POST["caption"]);
}
 require_once('appvars.php');

 $servername = "localhost";
 $username = "root";
 $password = "";

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

 // Check connection
 if (!$conn) {
   die("Connection failed: " . mysqli_connect_error());
  }

  if(!mysqli_select_db($conn,'image_display'))
  {
  echo 'Database not selected';
  }

@$name = mysqli_real_escape_string($conn, trim($_POST['name']));
$caption = mysqli_real_escape_string($conn, trim($_POST['caption']));
$Link = mysqli_real_escape_string($conn, trim($_POST['Link']));
$video = mysqli_real_escape_string($conn, trim($_POST['video']));
$image = mysqli_real_escape_string($conn, trim($_FILES['image']['name']));
$image_type = $_FILES['image']['type'];
$image_size = $_FILES['image']['size']; 



  if (!empty($caption) && !empty($image)) {
  if ((($image_type == 'image/gif') || ($image_type == 'image/jpeg') || ($image_type == 'image/pjpeg') || ($image_type == 'image/png'))
    && ($image_size > 0) && ($image_size <= TN_MAXFILESIZE)) {
    if ($_FILES['image']['error'] == 0) {
      // Move the file to the target upload folder
      $target = TN_UPLOADPATH . $image;
      if (move_uploaded_file($_FILES['image']['tmp_name'], $target)) {
        // Write the data to the database
        @$query = "INSERT INTO table1(image1,name,imagelink,caption,video) VALUES ('$image', '$name', '$link', '$caption', '$video')";
        mysqli_query($conn, $query);

        // Confirm success with the user
        echo '<p>Thanks for adding your new image</p>';
        //echo '<p><strong>Name:</strong> ' . $name . '<br />';
        //echo '<strong>Score:</strong> ' . $score . '<br />';
        echo '<img src="' . TN_UPLOADPATH . $image . '" alt="" /></p>';
        echo '<p><a href="index.php">&lt;&lt; Back to page</a></p>';

        // Clear  form
        $name = "";
        $caption = "";
        $Link = "";
        $video = "";
        $image = "";

        mysqli_close($conn);
      }
      else {
        echo '<p class="error">Sorry, there was a problem uploading your screen shot image.</p>';
      }
    }
  }
  else {
    echo '<p class="error">The screen shot must be a GIF, JPEG, or PNG image file no greater than ' . (TN_MAXFILESIZE / 1024) . ' file size is too big.</p>';
  }

  // Try to delete the temporary image file
  @unlink($_FILES['image']['tmp_name']);
}
else {
  echo '<p class="error">Please enter all of the information to add file.</p>';
}


  function test_input($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
    }
 ?>

关于php - 当表单字段为空时如何停止上传图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39601057/

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