A little tricky way to create progress bar
Progress bar has a general usage of acknowledging file uploading status in web.But in PHP if we know the percentage of file being uploaded in a certain interval continously(this is the main obstacle to overcome if you use PHP to do the job), then this technique will do the rest trick.
code snipplet:
<?php
// A function that will create the initial setup
// for the progress bar: You can modify this to
// your liking for visual purposes:
function create_progress() {
// First create our basic CSS that will control
// the look of this bar:
echo “
<style>
#text {
position: absolute;
top: 100px;
left: 50%;
margin: 0px 0px 0px -150px;
font-size: 18px;
text-align: center;
width: 300px;
}
#barbox_a {
position: absolute;
top: 130px;
left: 50%;
margin: 0px 0px 0px -160px;
width: 304px;
height: 24px;
background-color: black;
}
.per {
position: absolute;
top: 130px;
font-size: 18px;
left: 50%;
margin: 1px 0px 0px 150px;
background-color: #FFFFFF;
}
.bar {
position: absolute;
top: 132px;
left: 50%;
margin: 0px 0px 0px -158px;
width: 0px;
height: 20px;
background-color: #0099FF;
}
.blank {
background-color: white;
width: 300px;
}
</style>
“;
// Now output the basic, initial, XHTML that
// will be overwritten later:
echo “
<div id=’text’>Script Progress</div>
<div id=’barbox_a’></div>
<div class=’bar blank’></div>
<div class=’per’>0%</div>
“;
// Ensure that this gets to the screen
// immediately:
ob_flush();
flush();
}
// A function that you can pass a percentage as
// a whole number and it will generate the
// appropriate new div’s to overlay the
// current ones:
function update_progress($percent) {
// First let’s recreate the percent with
// the new one:
echo “<div class=’per’>{$percent}
%</div>\n”;
// Now, output a new ‘bar’, forcing its width
// to 3 times the percent, since we have
// defined the percent bar to be at
// 300 pixels wide.
echo “<div class=’bar’ style=’width: “,
$percent * 3, “px’></div>\n”;
// Now, again, force this to be
// immediately displayed:
ob_flush();
flush();
}
// Ok, now to use this, first create the
// initial bar info:
create_progress();
// Now, let’s simulate doing some various
// amounts of work, and updating the progress
// bar as we go. The usleep commands will
// simulate multiple lines of code
// being executed.
usleep(350000); //after .35 secs
update_progress(7);
usleep(1550000);
update_progress(28);
usleep(1000000);
update_progress(48);
usleep(1000000);
update_progress(68);
usleep(150000);
update_progress(71);
usleep(150000);
update_progress(74);
usleep(150000);
update_progress(77);
usleep(1150000);
update_progress(100);
// Now that you are done, you could also
// choose to output whatever final text that
// you might wish to, and/or to redirect
// the user to another page.
?>
