php表單驗證和顯示錯誤

Question

我認爲這很簡單，但我不知道如何執行它。

我有一個表格，有一些數據，我創建了另一個php文件來驗證表單數據，但是如果驗證失敗，我無法將錯誤信息顯示回表單。我重視這兩個文件，但我不知道燙去執行它:(

我form.php的樣子

<form name="form1" method="post" action="process/process_add_page.php"> 
    <fieldset> 
    <legend>Add Page</legend> 
    <table width="1056" height="365" border="1"> 
     <tr> 
     <th width="77" scope="col">Page Title</th> 
     <th width="962" scope="col"><label for="page_title"></label> 
     <input type="text" name="page_title" id="page_title"><span style="color:#FF0000">* <?php echo $titleerror;?></span></th> 
    </tr> 
    <tr> 
    <th scope="row">Page Description</th> 
    <td><label for="page_description"></label> 
    <textarea name="page_description" class="ckeditor" id="page_description" cols="100" rows="5"></textarea></td> 
    </tr> 
    <tr> 
    <th scope="row">Seo Title</th> 
    <td><label for="seo_title"></label> 
    <input type="text" name="seo_title" id="seo_title"></td> 
    </tr> 
    <tr> 
    <th scope="row">Seo Description</th> 
    <td><label for="seo_description"></label> 
    <textarea name="seo_description" class="ckeditor" id="seo_description" cols="45" rows="5"></textarea></td> 
    </tr> 
    <tr> 
    <th scope="row">Page Order</th> 
    <td><label for="page_order"></label> 
    <input type="text" name="page_order" id="page_order"></td> 
    </tr> 
    <tr> 
    <th scope="row">Page Status</th> 
    <td><label for="page_status"></label> 
     <select name="page_status" id="page_status"> 
     <option value="1">Active</option> 
     <option value="0">Inactive</option> 
    </select></td> 
    </tr> 
    <tr> 
    <th colspan="2" scope="row"><input type="submit" name="btnsubmit" id="btnsubmit" value="Submit"></th> 
    </tr> 
</table> 
<p>&nbsp;</p> 
    </fieldset> 
</form> 

和我process_add_pages.php看起來像這樣

<?php 

require_once('../../classes/database.php'); 
require_once('../../classes/pages.php'); 
require_once('../../classes/redirect.php'); 

$objPage=new Page(); 

$titleerror=''; 
if ($_SERVER["REQUEST_METHOD"] == "POST") { 
    if(empty($_POST['page_title'])){ 
     $titleerror = "Title is required"; 
     echo $titleerror; 


    }else 
    { 
     $page_title=mysqli_real_escape_string($objPage->conxn,$_POST['page_title']); 
    if (!preg_match("/^[a-zA-Z ]*$/",$page_title)) { 
     $titleerror = "Only letters and white space allowed"; 

      } 
    } 

$page_description=mysqli_real_escape_string($objPage-  >conxn,$_POST['page_description']); 
$seo_title=mysqli_real_escape_string($objPage->conxn,$_POST['seo_title']); 
$seo_description=mysqli_real_escape_string($objPage->conxn,$_POST['seo_description']); 
$page_order=mysqli_real_escape_string($objPage->conxn,$_POST['page_order']); 
$page_status=mysqli_real_escape_string($objPage->conxn,$_POST['page_status']); 
} 


$objPage->setPage_title($page_title); 
$objPage->setPage_description($page_description); 
$objPage->setSeo_title($seo_title); 
$objPage->setSeo_description($seo_description); 
$objPage->setPage_status($page_status); 

if($objPage->addPage()){ 
    new Redirect('../index.php?page=page&action=view&success=The page has been created'); 
}else{ 
new Redirect('../index.php?page=page&action=view&error=The page could not be created'); 
} 



?> 

Answer 1

有幾個小的變化，你必須做，以使其工作.. process_add_pages.php文件中有幾個問題。你的代碼是..

if ($_SERVER["REQUEST_METHOD"] == "POST") { 
    if(empty($_POST['page_title'])){ 
     $titleerror = "Title is required"; 
     echo $titleerror; /*error part-1 */ 


    }else 
    { 
     $page_title=mysqli_real_escape_string($objPage->conxn,$_POST['page_title']); 
    if (!preg_match("/^[a-zA-Z ]*$/",$page_title)) { 
     $titleerror = "Only letters and white space allowed"; /*error part-2 */ 

      } 
    } 

$page_description=mysqli_real_escape_string($objPage-  >conxn,$_POST['page_description']); 
$seo_title=mysqli_real_escape_string($objPage->conxn,$_POST['seo_title']); 
$seo_description=mysqli_real_escape_string($objPage->conxn,$_POST['seo_description']); 
$page_order=mysqli_real_escape_string($objPage->conxn,$_POST['page_order']); 
$page_status=mysqli_real_escape_string($objPage->conxn,$_POST['page_status']); 
} 

如果驗證中出現任何錯誤，它將在process_add_pages.php文件中回顯錯誤消息。但它也會執行sql查詢。所以如果在驗證中有任何問題，您可以重定向到表單頁面並顯示錯誤消息。 你可以試試這個新的代碼格式...

if ($_SERVER["REQUEST_METHOD"] == "POST") { 
    if(empty($_POST['page_title'])){ 
     $titleerror = "Title is required"; 
     new Redirect('../index.php?error="The page need a page title"'); 


    }elseif 
    { 
     $page_title=mysqli_real_escape_string($objPage->conxn,$_POST['page_title']); 
    if (!preg_match("/^[a-zA-Z ]*$/",$page_title)) { 
     new Redirect('../index.php?error="Only letters and white space allowed"'); 

      } 
    } 
else { 
$page_description=mysqli_real_escape_string($objPage-  >conxn,$_POST['page_description']); 
$seo_title=mysqli_real_escape_string($objPage->conxn,$_POST['seo_title']); 
$seo_description=mysqli_real_escape_string($objPage->conxn,$_POST['seo_description']); 
$page_order=mysqli_real_escape_string($objPage->conxn,$_POST['page_order']); 
$page_status=mysqli_real_escape_string($objPage->conxn,$_POST['page_status']); 
    } 
} 

Answer 2

我認爲，這是更好的方式來檢查驗證。在表單中添加提交。檢查標記中的CheckValidation（）函數。

<form name="form1" method="post" action="process/process_add_page.php" onsubmit="return CheckValidation()"> 
    <fieldset> 
     <legend>Add Page</legend> 
     <table width="1056" height="365" border="1"> 
      <tr> 
      <th width="77" scope="col">Page Title</th> 
      <th width="962" scope="col"><label for="page_title"></label> 
      <input type="text" name="page_title" id="page_title"> 
      <span style="color:#FF0000" style="display:none" id="RequiredTitle">* Title is required</span> 
      <span style="color:#FF0000" style="display:none" id="OnlyLetters">* Only letters and white space allowed</span> 
      </th> 
     </tr> 
     <tr> 
       <th scope="row">Page Description</th> 
       <td><label for="page_description"></label> 
       <textarea name="page_description" class="ckeditor" id="page_description" cols="100" rows="5"></textarea></td> 
     </tr> 
     . 
     . 
     . 
     //Rest of the code 
</form> 

<script> 
    function CheckValidation() 
    { 
     var Title=$('#page_title').val(); 
     if(Title=="") 
     { 
      $('#RequiredTitle').show(); 
      return false; 
     } 
     else 
     { 
      if(!preg_match("/^[a-zA-Z ]*$/",Title)) 
      { 
       $('#OnlyLetters').show(); 
       return false; 
      } 
     } 
    } 
</script>