I am having a problem with a simple php file in which I am trying to pass a variable from php to javascript. I have used the exact same code successfully in a more complex program, but cannot get it to work in the most trivial context here. Below is the entire code. When I run it, it complains that xxx is an unidentified variable:
<?php
echo "<h2 style='text-align: center'>Welcome</h2><br>";
echo '<script>var xxx = "Hello";</script>'
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<script>
echo xxx;
</script>
</body>
</html>
I know there are other ways to pass data from php to js, but this one is simplest and I have used it before. Why is it failing here?
-
1because there is no echo in JavaScript....epascarello– epascarello2015年07月16日 01:21:49 +00:00Commented Jul 16, 2015 at 1:21
-
Additionally, it is invalid HTML to have output before the DOCTYPE.Khalos– Khalos2015年07月16日 01:30:23 +00:00Commented Jul 16, 2015 at 1:30
2 Answers 2
You are mixing php and JavaScript syntax
<script>
echo xxx;
</script>
needs to be
<script>
console.log(xxx);
</script>
ANd the php code should be in the body if you are outputting HTML.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<?php
echo "<h2 style='text-align: center'>Welcome</h2><br>";
echo '<script>var xxx = "Hello";</script>'
?>
<script>
console.log(xxx);
</script>
</body>
</html>
answered Jul 16, 2015 at 1:23
epascarello
208k20 gold badges206 silver badges246 bronze badges
Sign up to request clarification or add additional context in comments.
Comments
This is how you can pass the value. Use ID as the parameter.
<script>
window.onload = function () {
document.getElementById('NO').onchange = disablefield;
document.getElementById('YES').onchange = disablefield;
}</script>
echo "<tr><td width='50%'><input type='radio' name='item' value='A' id='YES'>YES</td><td><input type='radio' name='item' value='B' id='NO'>NO</td></tr>";
Comments
default