我很难在php中获取要在js中使用的特定变量的值。这是我在php中的代码:
<?php
require("connection.php");
$sql_cmd = "SELECT * FROM tbstatus";
$stmt = $con->prepare($sql_cmd);
$stmt->execute();
echo "<h2>STATUS OF THE BABY</h2>";
while ($result = $stmt->fetch(PDO::FETCH_ASSOC)) {
echo "<h4>" . $result['status'] . "</h4>";
}
?>
我想获取此值($ result ['status'])并将其传递给js中的变量pos。这是我的js代码:
setInterval(function() {
$("#position").load('refresh.php');
notif();
}, 1000);
function notif() {
var pos = $('PHP VARIABLE HERE').val();
alert(pos);
}
感谢您的帮助。
答案 0 :(得分:1)
最简单的方法是将其直接输出到javascript:
?>
<script type="text/javascript">
window.MY_PHP_VAR = <?php echo json_encode($myPhpVar); ?>;
</script>
...
window.MY_PHP_VAR now contains your php variable
答案 1 :(得分:1)
如果您的JavaScript代码位于要显示结果的同一页上,那么您可以使用此
var pos = `<?php echo $result['status'] ?>`;
var pos = `<?= $result['status'] ?>`;
答案 2 :(得分:-1)
<?php
require("connection.php");
$sql_cmd = "SELECT * FROM tbstatus";
$stmt = $con->prepare($sql_cmd);
$stmt->execute();
echo "<h2>STATUS OF THE BABY</h2>";
while ($result = $stmt->fetch(PDO::FETCH_ASSOC)) {
echo '<h4> <span class="status">' . $result['status'] . '</span></h4>';
}
?>
var oldStatus = '';
setInterval(function() {
$("#position").load('refresh.php');
notif();
}, 1000);
function notif() {
// note that since we used a class, you will get the value of the first element only.
var pos = $('.status').text(); // use .text() instead of .val()
if (pos.toLowerCase() == 'out' && pos != oldStatus){
oldStatus = pos;
alert(pos);
}
}
答案 3 :(得分:-1)
===============
// refresh.php
===============
<?php
require("connection.php");
$sql_cmd = "SELECT * FROM tbstatus";
$stmt = $con->prepare($sql_cmd);
$stmt->execute();
echo "<h2>STATUS OF THE BABY</h2>";
while ($result = $stmt->fetch(PDO::FETCH_ASSOC)) {
echo "<h4>" . $result['status'] . "</h4>";
echo "<script> alert('". $result['status'] ."'); </script>";
/* If the $result['status'] is 'success' the above line will be converted to:
echo "<script> alert('success'); </script>";
*/
}
?>
因此,每次refresh.php加载时,脚本都将执行。
但是,我建议您为h4分配一个id或class属性,以在其中回显状态并使用javascript中的选择器访问该值。