Question

有点问题。我希望每当浏览器或选项卡关闭时执行查询，但如果该页面中存在任何按钮或链接，并且我点击它们中的任何一个，那么查询也会执行。。需要帮助

First.php

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1
/jquery.min.js"></script>

<script type="text/javascript">

 $(document).bind('keypress', function(e) {
    if (e.keyCode == 116){
      validNavigation = true;
    }
  });

  // Attach the event click for all links in the page
  $("a").bind("click", function() {
    validNavigation = true;
  });

  // Attach the event submit for all forms in the page
  $("form").bind("submit", function() {
    validNavigation = true;
  });

  // Attach the event click for all inputs in the page
  $("input[type=submit]").bind("click", function() {
    validNavigation = true;
  }); 

 window.addEventListener("beforeunload", function (e) {
 if (!validNavigation) { 
 $.ajax({
url: 'logout.php',
type: 'POST',
async: false,
timeout: 4000
});
}
})
</script>

logout.php

    <?php
$username = "root";
$password = "";
$hostname = "localhost"; 

$dbhandle = mysql_connect($hostname, $username, $password) 
 or die("Unable to connect to MySQL");
echo "Connected to MySQL<br>";


$selected = mysql_select_db("examples",$dbhandle) 
  or die("Could not select examples");

$result =  mysql_query("DELETE FROM cars WHERE id='1'");
mysql_close($dbhandle);
?>

Answer 1

事件＆＃34; beforeunload＆＃34;浏览器卸载当前文档时触发。如果您在同一页面上使用表单，则需要在按下提交时取消设置该事件。

例如像这样： window.onbeforeunload=null;

你可以在onsubmit处理程序中这样做：

<form onsubmit="cancelUnloadAndSubmit()">
  Enter name: <input type="text">
  <input type="submit">
</form>

Answer 2

像这样包装点击处理程序：

@ApplicationScoped

仅在浏览器关闭时执行查询

2 个答案: