Introduction
In one of my project there is a requirement in which I have to show a progress bar during the file upload. Its easily possible using Update Panel if we are using AJAX. But my application is not AJAX enabled. So I have to create a simple JavaScript progress bar. I have searched on internet and found some helpful java scripts. I collected the needed code and started it. And finally I made a good simple and easy to implement Progress bar. Here I have used a simple Form which can be shown when your server side process of file upload is going on. Here in this example I also have shown different kinds of validations which can be useful while uploading files. E.g. file size, file type, file already exists in designation folder etc.
Using the code
Follow the steps to implement the simple progress bar into your application.
1. Add following block of code into your Head section of your aspx page:
<head runat="server">
<title>Simple Progress bar</title>
<style>
<!--
.hide { position:absolute; visibility:hidden; }
.show { position:absolute; visibility:visible; }
-->
</style>
</head>
Remember to set the Language of your code snippet using the Language dropdown.
2. Then add following Script into your aspx page on top of the page.
<script script language="javascript" type="text/javascript">
var duration=2
var _progressWidth = 100;
var _progressBar = new String("������������������������������������������������������������������������");
var _progressEnd = 10;
var _progressAt = 0;
function ProgressCreate(end) {
_progressEnd = end;
_progressAt = 0;
if (document.all) {
progress.className = 'show';
progress.style.left = (document.body.clientWidth/2) - (progress.offsetWidth/2);
progress.style.top = document.body.scrollTop+(document.body.clientHeight/2) - (progress.offsetHeight/2);
} else if (document.layers) {
document.progress.visibility = true;
document.progress.left = (window.innerWidth/2) - 100;
document.progress.top = pageYOffset+(window.innerHeight/2) - 40;
} else if (document.getElementById) {
document.getElementById("progress").className = 'show';
var l = (window.innerWidth/2) - 100;
var t = pageYOffset + (window.innerHeight/2) - 40;
document.getElementById("progress").style.left = l + "px";
document.getElementById("progress").style.top = t + "px";
}
ProgressUpdate();
}
function ProgressDestroy() {
if (document.all) {
progress.className = 'hide';
} else if (document.layers) {
document.progress.visibility = false;
} else if (document.getElementById) {
document.getElementById("progress").className = 'hide';
}
}
function ProgressStepIt() {
_progressAt++;
if(_progressAt > _progressEnd) _progressAt = _progressAt % _progressEnd;
ProgressUpdate();
}
function ProgressUpdate() {
var n = (_progressWidth / _progressEnd) * _progressAt;
if (document.all) {
var bar = document.all["dialog"].document.getElementById("bar");
} else if (document.layers) {
var bar = document.layers["progress"].document.forms["dialog"].bar;
n = n * 0.55;
} else if (document.getElementById){
var bar=document.dialog.bar
}
var temp = _progressBar.substring(0, n);
bar.value = temp;
}
function Demo() {
ProgressCreate(10);
window.setTimeout("Click()", 100);
}
function Click() {
if(_progressAt >= _progressEnd) {
ProgressDestroy();
return;
}
ProgressStepIt();
window.setTimeout("Click()", (duration-1)*1000/10);
}
function CallJS(jsStr) {
return eval(jsStr);
}
</script>
3. Then add below script block at bottom of your aspx page.
First i tried to keep below script block with above script block on top of the page, but it was not working properly, so i tried to put it bottom of the page before Forms tag over and it works. I don't know the reason why it is so, if anybody came to know please update me.
<script language="JavaScript" type="text/javascript">
document.write("<span id=\"progress\" class=\"hide\">");
document.write("<FORM name=\"dialog\" id=\"dialog\">");
document.write("<TABLE border=2 style=\"background-color:Navy;\" >");
document.write("<TR><TD ALIGN=\"center\" style=\"FONT-FAMILY:trebuchet ms; PADDING:0px; FONT-WEIGHT:bold; COLOR:white;\">");
document.write("Please wait<BR>");
document.write("<input type=label name=\"bar\" value=\"Please Wait.........\" size=\"" + _progressWidth/2 + "\"");
if(document.all || document.getElementById)
document.write(" bar.style=\"color:navy;\">");
else
document.write(">");
document.write("</TD></TR>");
document.write("</TABLE>");
document.write("</FORM>");
document.write("</span>");
ProgressDestroy();
</script>
4. Now you script section is over. Now add file upload control into your page where required and also add Upload button as below.
<asp:FileUpload ID="FileUpload1" runat="server"/>
<asp:Button ID="btnUpload" runat="server" Text="Upload File" OnClick="btnUpload_Click" OnClientClick="return CallJS('Demo()');" />
5. Now your aspx page side work is over. You can write server side code to upload and save your file at appropriate place. you can download the code and implement the same.
Your guidance & suggestions are always welcome.
