自动提交表格一次 [英] submit form automatically only once

问题描述

我做了一个表格，当页面打开时我需要自动提交. 我已经尝试过此javascript代码，但是它的作用是创建一个循环，在该循环中，表单可以无限次提交而不会停止.我需要在打开页面时仅提交一次表单的代码.请给我一个建议.

I have made a form which I need to self submit automatically when page is opened. I have tried this javascript code but what it does it creates a loop where form is submitted unlimited time without stop. I need the code where form would be submitted only once when page is opened. Please give me an advice.

<form id="form" action="form.php" method="POST" >
  <select id="main" name="main">
    <option value="1" <?php if (@$_POST['main']=='1') {echo "selected='selected'"; } ?>>One</option>
    <option value="2" <?php if (@$_POST['main']=='2') {echo "selected='selected'"; } ?>>Two</option>
  </select>
</form>

<script>
  document.getElementById("form").submit();
</script>

推荐答案

您可以检查表单以前是否使用POST超全局提交

You can check if the form was previously submitted with the POST superglobal

<form id="form" action="form.php" method="POST" >
  <select id="main" name="main">
    <option value="1" <?php if (@$_POST['main']=='1') {echo "selected='selected'"; } ?>>One</option>
    <option value="2" <?php if (@$_POST['main']=='2') {echo "selected='selected'"; } ?>>Two</option>
  </select>
</form>

<?php
    if ( ! isset($_POST['main']) ) { // not submitted yet
?>
   <script>
      document.getElementById("form").submit();
   </script>
<?php
    }
?>

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