确定当窗体上有两个按钮时单击了哪个按钮

Question

我正在尝试在我的表单中添加两个按钮，以记录联系供应商和回复的时间。

我遇到的问题是，当我单击一个按钮时，两个字段中的值都会发生变化。请建议我如何解决这个问题。

谢谢！

 <tr>     
    <th>
    <p>Vendor was contacted at:</p>
      <button name="start" >Start</button><br>
      <?php
      session_start ();
      if (isset($_POST['start']))
      {
      $date_start = date('m-d-Y H:i:s');
      $_SESSION['start'] = $date_start;
      }
      ?>
      <br>
      <input name="start" type="text" class="textfield" value="<?php echo $_SESSION['start']; ?>"
      <br>
      </th>
 </tr>
 <tr>
      <th>
      <p>Vendor responded at:</p>
      <button name="response" >Response</button><br>
      <?php
      if (isset($_POST['response']))
      {
      $date_response = date('m-d-Y H:i:s');
      $_SESSION['response'] = $date_response;
      }
      ?>
      <br>
      <input name="response" type="text" class="textfield" value="<?php echo $_SESSION['response']; ?>"
      <br>
      </th>
 </tr>

Answer 1

首先$_POST['start'] 是一个名为start 的输入值，$_POST['response'] 是一个名为response 的输入值。 如果您想知道在表单中单击了哪个按钮，您必须为按钮设置一个值。将<button name="start" > 更改为<input type="submit" value="start" />。比检查像这样点击的按钮if ('start' === $_POST['submit'])。 在底部，您的代码应如下所示：

<tr>     
    <th>
        <p>Vendor was contacted at:</p>
          <!-- changed line -->
          <input type="submit" name="submit" value="start" /><br>
          <?php
          session_start ();
          /* changed line */
          if ('start' === $_POST['submit']) {
              $date_start = date('m-d-Y H:i:s');
              $_SESSION['start'] = $date_start;
          }
          ?>
          <br>
          <input name="start" type="text" class="textfield" value="<?php echo $_SESSION['start']; ?>"
          <br>
    </th>
</tr>

祝你好运！

Answer 2

这里有几个问题...

首先 - 您正在加载页面并尝试回显一个不存在的会话。这会给你带来错误。

要解决此问题，请将$_SESSION['start'] = ''; 放在if (isset($_POST['start'])) 上方并将$_SESSION['response'] = ''; 放在if (isset($_POST['response'])) 上方，这定义了您的会话，但值为空。

第二 - 将每个表格行放在自己的表格和表格中。

<form name="form1" method="post" action="">
<table>
  <tr>     
    <th>
    <p>Vendor was contacted at:</p>
      <button name="start" >Start</button><br>
      <?php
      if (!isset($_SESSION)) {
          session_start ();
      }
      /* these five lines ask if there is an existing session & if there is an existing session... is it empty
      if there is an existing session & it's not empty... we use it
      otherwise... we create an empty session to prevent errors
      this also maintains the session data when the other button is clicked like you asked in your comments */
      if(isset($_SESSION['start']) && $_SESSION['start'] != '') {
          $_SESSION['start'] = $_SESSION['start'];
      } else {
          $_SESSION['start'] = '';
      }
      if (isset($_POST['start']))
      {
      $date_start = date('m-d-Y H:i:s');
      $_SESSION['start'] = $date_start;
      }
      ?>
      <br>
      <input name="start" type="text" class="textfield" value="<?php echo $_SESSION['start']; ?>">
      <br>
      </th>
  </tr>
</table>
</form>
<form name="form2" method="post" action="">
<table>
  <tr>
      <th>
      <p>Vendor responded at:</p>
      <button name="response" >Response</button><br>
      <?php
      if(isset($_SESSION['response']) && $_SESSION['response'] != '') {
          $_SESSION['response'] = $_SESSION['response'];
      } else {
          $_SESSION['response'] = '';
      }
      if (isset($_POST['response']))
      {
      $date_response = date('m-d-Y H:i:s');
      $_SESSION['response'] = $date_response;
      }
      ?>
      <br>
      <input name="response" type="text" class="textfield" value="<?php echo $_SESSION['response']; ?>">
      <br>
      </th>
  </tr>
</table>
</form>

更新：

如果你想保留数据（如果你想让你的数据持久化）......改变......

      <?php
      session_start ();
      $_SESSION['start'] = '';
      if (isset($_POST['start'])) {
          $date_start = date('m-d-Y H:i:s');
          $_SESSION['start'] = $date_start;
      }
      ?>

到...

      <?php
      if (!isset($_SESSION)) {
          session_start ();
      }
      if(isset($_SESSION['start']) && $_SESSION['start'] != '') {
          $_SESSION['start'] = $_SESSION['start'];
      } else {
          $_SESSION['start'] = '';
      }
      if (isset($_POST['start']))
      {
      $date_start = date('m-d-Y H:i:s');
      $_SESSION['start'] = $date_start;
      }
      ?>

然后改变...

  <?php
  $_SESSION['response'] = ''; 
  if (isset($_POST['response'])) {
      $date_response = date('m-d-Y H:i:s');
      $_SESSION['response'] = $date_response;
  }
  ?>

到...

      <?php
      if(isset($_SESSION['response']) && $_SESSION['response'] != '') {
          $_SESSION['response'] = $_SESSION['response'];
      } else {
          $_SESSION['response'] = '';
      }
      if (isset($_POST['response']))
      {
      $date_response = date('m-d-Y H:i:s');
      $_SESSION['response'] = $date_response;
      }
      ?>