更新表格并显示勾选的复选框

Question

所以我有能力提交一个表单，允许我设置我的帖子属于哪个类别哪个很好 - 但是如果我想编辑它所属的类别，那么更新不会改变连接表？我还在查看如何在您进入更新文档时显示检查哪些类别，并下拉帖子所属的类别。

以下是要更新的表单：

<?php 

require_once '../../db_con.php'; 

if(!empty($_GET['doc_id'])){
    $doc = intval($_GET['doc_id']);
try{
    $results = $dbh->prepare('SELECT * FROM doc_list WHERE doc_id = ?');
    $results->bindParam(1, $doc);
    $results->execute();

    } catch(Exception $e) {
    echo $e->getMessage();
    die();
    }

    $doc = $results->fetch(PDO::FETCH_ASSOC);    
    if($doc == FALSE){

        echo '<div class="container">';
        echo "<img src='../img/404.jpg' style='margin: 40px auto; display: block;' />";
        echo "<h1 style='margin: 40px auto; display: block; text-align: center;' />Oh Crumbs! You upset the bubba!</h1>";
        echo '<a href="userList.php"  style="margin: 40px auto; display: block; text-align: center;">Get me outta here!</a>';
        echo'</div>';
        die();
    }
}

?>


<div class="container">


<br>  
<a href="javascript:history.back(-1);" class="backLink"><i class="fa fa-angle-double-left"></i> Previous page</a> 
<br>       


<h3 class="subTitle">
    <i class="fa fa-pencil"></i></span> Edit Document
</h3>



    <?php
    if(isset($doc)){
    ?>


<form action="actions/update_doc.php" method="POST" id="rtf" name="">

    <input type="hidden" value="<?php echo $doc['doc_id'] ?>" name="doc_id" />
    <input type="text" value="<?php echo $doc['doc_title'] ?>" name="doc_title" required />
    <br />


    <?php 


    try{
        // Selecting entire row from cat_list table
        $results = $dbh->query("SELECT cat_id, cat_title FROM cat_list");

    }catch(Exception $e) {
        echo $e->getMessage();
        die();
    }
        $category = $results->fetchAll(PDO::FETCH_ASSOC);
    ?>

    <br>
    <label><input type="checkbox" name="" class="selectall"/> Select all</label>
    <div id="checkboxlist" >
    <?php
        foreach($category as $cat){ 
    ?>

    <input type="checkbox" value="<?php echo $cat["cat_id"];  ?>" name="cat_no[]" id="box1"> <?php echo $cat["cat_title"]; ?></a><br>

    <?php
    }
    ?>
    </div> 
    <br><br>


    <button class="postEditBtn" type="button" onclick="ibold()" title="Bold Text"><i class="fa fa-bold"></i></button>
    <button class="postEditBtn" type="button" onclick="iitalic()" title="Italic Text"><i class="fa fa-italic"></i></button>
    <button class="postEditBtn" type="button" onclick="iunderline()" title="Underline Text"><i class="fa fa-underline"></i></button>
    <button class="postEditBtn" type="button" onclick="ifontName()" title="Font Family"><i class="fa fa-font"></i></button>
    <button class="postEditBtn" type="button" onclick="ifontsize()" title="Font Size"><i class="fa fa-text-height"></i></button>
    <button class="postEditBtn" type="button" onclick="ifontcolor()" title="Font Colour"><i class="fa fa-eraser"></i></button>
    <button class="postEditBtn" type="button" onclick="ihiliteColor()" title="Highlight Text"><i class="fa fa-magic"></i></button>
    <button class="postEditBtn" type="button" onclick="ilink()" title="Add/Edit Link"><i class="fa fa-link"></i></button>
    <button class="postEditBtn" type="button" onclick="iunlink()" title="Remove Link"><i class="fa fa-chain-broken"></i></button>
    <button class="postEditBtn" type="button" onclick="ijustifyLeft()" title="Text align-left"><i class="fa fa-align-left"></i></button>
    <button class="postEditBtn" type="button" onclick="ijustifyCenter()" title="Text align-center"><i class="fa fa-align-center"></i></button>
    <button class="postEditBtn" type="button" onclick="ijustifyRight()" title="Text align-right"><i class="fa fa-align-right"></i></button>
    <button class="postEditBtn" type="button" onClick="iUnorderedList()" title="Unordered List"><i class="fa fa-list-ul"></i></button>
    <button class="postEditBtn" type="button" onClick="iOrderedList()" title="Ordered List"><i class="fa fa-list-ol"></i></button>
    <button class="postEditBtnUndo" type="button" onClick="iUndo()" title="Undo last change"><i class="fa fa-rotate-left"></i></button>
    <button class="postEditBtnRedo" type="button" onClick="iRedo()" title="Redo last change"><i class="fa fa-rotate-right"></i></button>



     <br><br>

    <textarea name="doc_content" id="doc_content" placeholder="Document Content" style="display: none;"></textarea>


    <iframe name="editor" id="editor" style="width:100%; height: 600px;"></iframe>   



    <br />    

    <input onclick="formsubmit()" type="submit" value="Update Document" name="submit"/>



</form>

这是我的更新脚本：

<?php

/******************************************************************
**  ACTION SCRIPT TO UPDATE THE DOCUMENT AFTER CHANGES ARE MADE  **
******************************************************************/ 

if(isset($_POST["submit"])){
include_once'../../config.php';

try {

$dbh = new PDO("mysql:host=$hostname;dbname=dashboardr",$username,$password);

$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // <== add this line

$sql = "UPDATE doc_list SET doc_title = :doc_title, doc_content = :doc_content, doc_updated=CURRENT_TIMESTAMP WHERE doc_id = :doc_id";
$query = $dbh->prepare($sql);
$query->execute(array(":doc_title"=>$_POST["doc_title"],":doc_content"=>$_POST["doc_content"], ":doc_id"=> $_POST["doc_id"]));

if ($query) {
    header ('Location: ../list_doc.php?success=2');
}
/***********************************************************************
**  INSERTS THE ARRAY DEPENDING ON WHICH WAS CHECKED WITHIN THE FORM  **
***********************************************************************/


$sql = "UPDATE `cat_doc_link_table`(`link_cat_id`, `link_doc_id`) VALUES";
$values = "";
$params = [];

foreach($_POST["cat_no"] as $cat)

{

    $values.= "(?, ?), ";
    $params[] = $cat; // correct here
    $params[] = $docId;
}
    $values = substr($values, 0, -2);
    $sql.= $values;
    $query = $dbh->prepare($sql);
    $query->execute($params);       

    if ($dbh->query($sql)) {

    }else{}

    $dbh = null;
    }catch(PDOException $e)

    {
    header ('Location: ../list_doc.php?success=2');
    }

    }
?>

所以我有两个三个表，一个名为doc_list（用于帖子）cat_list处理类别，一个联合能够从doc_list和cat_list中获取id，这两个表结合了两个表。

如上所述，在更新文档表单（第一个脚本）中，一种方法是拉入并勾选它们所关联的类别的复选框。我遇到的主要问题是当你进入并想要更新时更新表。