提交表单后如何重新填充表单数据以及错误

Question

提交文件后，现有文件出错后如何显示表单数据。我希望错误与之前输入的文档标题一起显示。现在，我可以在提交后显示错误，但标题输入为空。我希望保留键入的文档标题。怎么做？我在下面添加了 doc.php 和 code.php 的代码以供参考。希望这对我有所帮助。

    <?php
//check error
if(isset($_SESSION['success']) && $_SESSION['success'] !='')
{
    echo '<h2 class="alert alert-warning alert-dismissible fade show" role="alert"> '.$_SESSION['success'].'</h2> ';
    unset($_SESSION['success']);
}

if(isset($_SESSION['status']) && $_SESSION['status'] !='')
{
    echo '<h2 class="bg-danger text-white"> '.$_SESSION['status'].'</h2> ';
    unset($_SESSION['status']);
}


?>
 <form action="code.php" method="POST" enctype="multipart/form-data">
  <hr style="border-top: 3px solid #ccc; background: transparent;">
  <h5>Add Documents</h5>
  <hr style="border-top: 1px solid #ccc; background: transparent;">

  <div class="form-group" >
    <label>Title</label>
    <input type="text" name="doc_title" class="form-control"  required>
  </div>

  <div class="form-group" >
      <label>Documents </label>
      <input type="file" name="doc" class="form-control" id="image"  required>
  </div>                
      
  <div class="float-right mb-2">        
    <button type="submit" name="adddoc" class="btn btn-primary">Save</button>
    <a href="doc.php" class="btn btn-danger">Cancel</a>      
  </div>
 </form>

code.php

if(isset($_POST['adddoc']))
{
$docTitle=$_POST['doc_title'];

$file=$_FILES['doc'];

$doc_name=$_FILES['doc']['name'];
$doc_tmpName=$_FILES['doc']['tmp_name'];
$doc_size=$_FILES['doc']['size'];
$doc_error=$_FILES['doc']['error'];
$doc_type=$_FILES['doc']['type'];

$docExt=explode('.', $doc_name);
$docActualExt= strtolower(end($docExt));
$doc_allow=array('pdf','xlsx');

    if($doc_error === 0)
    {
        if($doc_size < 10000000)
        {

            $docDestination='upload/'.$doc_name;
            move_uploaded_file($doc_tmpName, $docDestination);

            $query="INSERT INTO documents (doc_title,doc) VALUES (?,?)";
            $stmt=mysqli_stmt_init($conn);
            if(mysqli_stmt_prepare($stmt,$query)){
                mysqli_stmt_bind_param($stmt,"ss",$docTitle,$doc_name);
                mysqli_stmt_execute($stmt);
               
                $_SESSION['success']="Doc added";
            header('Location: doc.php');

            }
            else{
                $_SESSION['status']="Not added";
                header('Location: adddoc.php');

            }

        }
        else
        {
            $_SESSION['status']="The file is too big!";
            header('Location: adddoc.php');
          
        }
    }
    else
    {
        $_SESSION['status']="Error uploading file";
            header('Location: adddoc.php');
    }
}

Answer 1

只需添加$_POST['fieldName'] 作为输入值

<form action="code.php" method="POST" enctype="multipart/form-data">
  

  <hr style="border-top: 3px solid #ccc; background: transparent;">

  <h5>Add Documents</h5>
  <hr style="border-top: 1px solid #ccc; background: transparent;">

  <div class="form-group">
    <label>Title</label>
    <input type="text" name="doc_title" class="form-control" value="<?php echo isset($_POST['doc_title']) ? $_POST['doc_title'] : '' ?>" required>
  </div>

  <div class="form-group">
      <label>Documents </label>
      <input type="file" name="doc" class="form-control" id="image"  required>
  </div>                
      
  <div class="float-right mb-2">        
    <button type="submit" name="adddoc" class="btn btn-primary">Save</button>
    <a href="doc.php" class="btn btn-danger">Cancel</a>      
  </div>
 </form>