Mick Redman: loading

Tuesday, 10 February 2015

Using Font Awesome icons and jQuery to show form loading in Twitter Bootstrap page

Font Awesome is a really useful tool for adding icons to your website. It also comes with animated icons which can be used to show when your form is waiting for a response. In the example below, I have created a basic Twitter Bootstrap page. The page has a form. When the form is submitted, there is a delay in its response. During the delay, I use jQuery to show a Font Awesome animated icon.
First the Twitter Bootstrap page with the differences in red:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Font Awesome Animated Icons</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css">

</head>
<body>
<i class="fa fa-circle-o-notch fa-spin"></i>
<form action="response.php" method="POST">
<input type="text" name="yourname" id="yourname" placeholder="Enter your name" />
<button type="submit">Submit</button>
</form>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<script>
(function()
{
var thisForm = $('form');
var i = $('i');
i.hide();
thisForm.submit(function()
{
i.show();
thisForm.hide();
$.post(thisForm.attr('action'),thisForm.serialize(),
function(data)
{
thisForm.empty().html(data);
i.hide();
thisForm.show();
});
return false;
});
})();
</script>
</body>
</html>
Now my response.php
<?php
sleep(2);
echo 'Hello '.$_POST['yourname'];
?>

Tuesday, 8 February 2011

Submit Form with Loader

I achieve 2 objectives with the form below.

The first is that I use jQuery to capture the user hitting the enter key after adding the password. By using jQuery, this works in all browsers.

The second thing I deliver is a 'loading...' image when the form has been submitted. It stays there until we have a result from the target PHP script, authenticate.php. Your authenticate.php could look something like this
<?php
echo 'Who are you?';
?>

You could also pass parameters to the PHP and do it properly. See http://effectivewebdesigns.blogspot.com/2010/10/send-form-information-to-php-through.html

BTW, you'll also have to create your own loading.gif

See demo.

<!DOCTYPE html>
<html lang=”en”>
<head>
<meta charset="UTF-8">
<title>Submit Form with Loader</title>
<script src="http://www.google.com/jsapi"></script>
<script>
google.load("jquery", "1");
google.load("jqueryui", "1");
</script>
<script>
$(document).ready(function()
{
$('#pass').keyup(function(event)
{
if(event.keyCode == 13)
{
$("#sub").click();
}
});
$('#sub').click(function()
{
$('#formlogin').empty().html('<img src="loading.gif" />');
$.post('authenticate.php',
   {

   }, function(data)
   {
   $('#formlogin').empty().html(data);
   });
   return false;
});

});
</script>
</head>
<body>
<form id='formlogin'>
<input type='text' name='username' id='username' />
<input name='pass' id='pass' type='password' />
<input type='submit' value='login' name="sub" id="sub" />
</form>
</body>
</html>