我試圖在下拉列表中選擇一個項目后對價格進行求和，但它只顯示 NaN。下拉列表的值是從 MySQL 數據庫檢索的<?php //database connection here?> <table border=" 1"> <thead> <tr> <th>Component</th> <th>Item Name</th> <th>Price </th> </tr> </thead> <tbody> <tr> <td>CPU</td> <td> <?php //Retrieving CPU table $query = $conn->query("SELECT * FROM cpu"); echo '<select onChange = parseFloat($("#cpuprice").val($(this).find("option:selected").attr("cpuprice")))>'; echo "<option>---select your CPU---</option>"; while ($obj = $query->fetch_object()) { echo '<option cpuprice = "' . $obj->price . '" >' . $obj->cpuname . '</option>'; } echo '</select>'; ?> </td> <td> <output class="form-control prc" id="cpuprice" disabled value=""> </td> </tr> </tbody> <tbody> <tr> <td>GPU</td> <td> <?php //Retrieving GPU table $query = $conn->query("SELECT * FROM gpu"); echo '<select onChange = parseFloat($("#tpuprice").val($(this).find("option:selected").attr("gpuprice")))>'; echo "<option>---select your GPU---</option>"; while ($obj = $query->fetch_object()) { echo '<option gpuprice = "' . $obj->price . '" >' . $obj->gpuname . '</option>'; } echo '</select>'; ?> </td> <td> <output class="form-control prc" id="tpuprice" disabled value=""> </td> </tr> </tbody> </table>https://i.stack.imgur.com/zPdnK.png
如何對從數據庫中檢索到的下拉列表中選擇的商品的價格求和
慕的地8271018
2023-11-02 17:13:33
