javascript - 如何将输入值存储到php变量

Question

<input type="text" id="transaction_id_input" name="transaction_name">

以上是我想存储在 PHP 变量中的值，以便我可以在 MySQL 数据中比较它以显示特定数据。我尝试将输入值也存储到 javascript document.getElementByID("sampleID").value，然后将其存储在变量中，但它也不起作用，希望你能帮助我解决这个问题。

<form method="GET" id="reg" name="valid" action="<?php echo htmlspecialchars(
        $_SERVER["PHP_SELF"]
    ); ?>">
    <input type="text" id="transaction_id_input" name="transaction_name">
        <div class="wrapper" >
            <div class="search-input">
              <a href="" target="_blank" hidden></a>         
              <input type="text" id="searchmodal" placeholder="Type to search..">          
              <div class="icon"><i class="fas fa-search"></i></div>
            </div>
        </div>
        <br><br>
        <div class="card-header" id="cardheader2">
              List of Medicine Transaction
        </div><br><br>
        <div class="enrollbutton2">
            <a class="nav-link" id="transactioninfo_to_addtransan_class" data-toggle="modal" data-target="#myModal_transaction">Add Transaction
                <span>
                    <lord-icon
                        src="https://cdn.lordicon.com/mecwbjnp.json"
                        trigger="loop"
                        colors="primary:#ffffff,secondary:#ffffff"
                        stroke="70"
                        style="width:30px;height:30px">
                    </lord-icon>
                </span>
            </a>
        </div>
        <div class="tableholdermodal" id="transactiontable">
        <br><br><br><br>
        <table>
            <thead>
              <tr>
                <th scope="col">Transaction No.</th>
                <th scope="col">Medicine Code</th>
                <th scope="col">Supply</th>
                <th scope="col">Lot No.</th>
                <th scope="col">Expiration Date</th>
                <th scope="col">Inputed Date</th>          
              </tr>
            </thead>
            <tbody id="myModalTable">
    
            <?php
            include "pdo_connection2.php";
            $stm3 = $conn->query(
                "SELECT * FROM tbl_transaction WHERE transaction_medicinecode = '' "
            );
            $rows = $stm3->fetchAll(PDO::FETCH_ASSOC);
            if (count($rows) > 0) {
                foreach ($rows as $row) { ?>
                  <tr>
                        <td data-label='Transaction ID' value="<?php echo $row[
                            "transaction_id"
                        ]; ?>"><?php echo $row["transaction_id"]; ?></td>
                        <td data-label='Medicine Code' value="<?php echo $row[
                            "transaction_medicinecode"
                        ]; ?>"><?php echo $row["transaction_medicinecode"]; ?></td>
                        <td data-label='Supply' value="<?php echo $row[
                            "transaction_supply"
                        ]; ?>"><?php echo $row["transaction_supply"]; ?></td>
                        <td data-label='Lot No.' value="<?php echo $row[
                            "transaction_lotnum"
                        ]; ?>"><?php echo $row["transaction_lotnum"]; ?></td>
                        <td data-label='Expiration Date' value="<?php echo $row[
                            "transaction_expdate"
                        ]; ?>"><?php echo $row["transaction_expdate"]; ?></td>
                        <td data-label='Date Registered' value="<?php echo $row[
                            "transaction_date"
                        ]; ?>"><?php echo $row["transaction_date"]; ?></td>
                        <td data-label='Action'>
                          <button type="button" class="transaction_update_class" name="transaction_update_name" data-toggle="modal" data-target="#myModalupdate_transactopn"  value="<?php echo $row[
                              "transaction_id"
                          ]; ?>">
                              <lord-icon
                                  src="https://cdn.lordicon.com/wloilxuq.json"
                                  trigger="loop"
                                  colors="primary:#fb0054,secondary:#f55b2a "
                                  stroke="70"
                                  style="width:55px;height:55px">
                              </lord-icon>
                          </button>
    
                          <button type="button" class="transaction_delete_class" name="transaction_delete_name" data-toggle="modal" data-target="#myModaldelete_transaction" value="<?php echo $row[
                              "transaction_id"
                          ]; ?>">
                              <lord-icon
                                  src="https://cdn.lordicon.com/gsqxdxog.json"
                                  trigger="loop"
                                  colors="primary:#fb0054,secondary:#f55b2a "
                                  stroke="70"
                                  style="width:55px;height:55px">
                              </lord-icon>
                          </button>
    
                      </td>
                  </tr>
                  
                <?php }
            } else {
                 ?>
                <tr><td><h4 id="h4nodatafound">------ NO DATA FOUND ------</h4></td></tr>
                <?php
            }
            ?>
              
    
            </tbody>
          </table>
          
          </div>
    </form> 

标签： javascriptphphtmlmysql