如何将JavaScript变量传递给PHP？

发布日期：2018-03-10 16:23
分类：PHP
浏览次数：113
我想利用表单中的hidden类型input标签将JavaScript变量传递给PHP。
但我无法将$_POST['hidden1'] 的值传递给 $salarieid,请问什么地方做错了?这是我的代码
<script type="text/javascript">
// view which the user has chosen
function func_load3(name){
    var oForm = document.forms["myform"];
    var oSelectBox = oForm.select3;
    var iChoice = oSelectBox.selectedIndex;
    //alert("you have choosen: " + oSelectBox.options[iChoice].text );
    //document.write(oSelectBox.options[iChoice].text);
    var sa = oSelectBox.options[iChoice].text;
    document.getElementById("hidden1").value = sa;
}
</script>

<form name="myform" action="<?php echo $_SERVER['$PHP_SELF']; ?>" method="POST">
        <input type="hidden" name="hidden1" id="hidden1"  />
</form>

<?php
   $salarieid = $_POST['hidden1'];
   $query = "select * from salarie where salarieid = ".$salarieid;
   echo $query;
   $result = mysql_query($query);
?>

<table>
   code for display the query result. 
</table>
提前先感谢你们的建议

回答

你当然无法将变量从当前页面传递给当前页面的PHP代码，PHP代码运行在服务器端，它不知道客户那边在做什么。你应该用另一种机制来吧html表单里的变量传递给PHP代码，比如使用GET或者POST方式提交表单。 
<DOCTYPE html>
<html>
  <head>
    <title>My Test Form</title>
  </head>

  <body>
    <form method="POST">
      <p>Please, choose the salary id to proceed result:</p>
      <p>
        <label for="salarieids">SalarieID:</label>
        <?php
          $query = "SELECT * FROM salarie";
          $result = mysql_query($query);
          if ($result) :
        ?>
        <select id="salarieids" name="salarieid">
          <?php
            while ($row = mysql_fetch_assoc($result)) {
              echo '<option value="', $row['salaried'], '">', $row['salaried'], '</option>'; //between <option></option> tags you can output something more human-friendly (like $row['name'], if table "salaried" have one) 
            }
          ?>
        </select>
        <?php endif ?>
      </p>
      <p>
        <input type="submit" value="Sumbit my choice"/>
      </p>
    </form>

    <?php if isset($_POST['salaried']) : ?>
      <?php
        $query = "SELECT * FROM salarie WHERE salarieid = " . $_POST['salarieid'];
        $result = mysql_query($query);
        if ($result) :
      ?>
        <table>
          <?php
            while ($row = mysql_fetch_assoc($result)) {
              echo '<tr>';
              echo '<td>', $row['salaried'], '</td><td>', $row['bla-bla-bla'], '</td>' ...; // and others
              echo '</tr>';
            }
          ?>
        </table>
      <?php endif?>
    <?php endif ?>
  </body>
</html>
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