使用php和javascript在FF和Chrome中无法正常显示警报错误

Question

I use this piece of code to inform user to fill some field in this way:

ob_start();  
$msg = $_SESSION['ErrorUser'];

if($msg !=""){
    echo '<script type="text/javascript">alert(" ' . $msg . '");</script>';
}

//echo $msg;
$_SESSION['ErrorUser']  = "";                 
ob_end_flush();

This works in Internet explorer while in FF and Chrome. The msg is displayed, but I have nothing in background, just a part of my page is showed (behind my Message alert).

Answer 1

The problem you're facing is that your outputting the alert straight into your dom which will cause the alert to be triggered while the dom is still loading. If you're using jQuery you should output the alert box inside the jQuery(document).ready callback or otherwise bind to the load / DOMcontentready events of the window object.