File Upload Progress bar without Using AJAX

Nilesh Thakkar

2.20/5 (11 votes)

Aug 8, 2007

2 min read

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This article shows how to implement the simple JS progressbar in asp.net application.

Download SampleProgressBar.zip - 26.7 KB

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 // Specify duration of progress bar in seconds
    var _progressWidth = 100;    // Display width of progress bar
    var _progressBar = new String("»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»");
    var _progressEnd = 10;
    var _progressAt = 0;

    // Create and display the progress dialog.
    // end: The number of steps to completion
    function ProgressCreate(end) {
        // Initialize state variables
        _progressEnd = end;
        _progressAt = 0;

        // Move layer to center of window to show
        if (document.all) {    // Internet Explorer
            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) {    // Netscape
            document.progress.visibility = true;
            document.progress.left = (window.innerWidth/2) - 100;
            document.progress.top = pageYOffset+(window.innerHeight/2) - 40;
        } else if (document.getElementById) {    // Netscape 6+
            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";
//            document.getElementById("progress").style.left = (window.innerWidth/2) - 100;
//            document.getElementById("progress").style.top = pageYOffset+(window.innerHeight/2) - 40;
//          Above 2 lines modified by Nilesh Thakkar on 23-July-2007
        }

        ProgressUpdate();    // Initialize bar
    }

    // Hide the progress layer
    function ProgressDestroy() {
        // Move off screen to hide
        if (document.all) {    // Internet Explorer
            progress.className = 'hide';
        } else if (document.layers) {    // Netscape
            document.progress.visibility = false;
        } else if (document.getElementById) {    // Netscape 6+
            document.getElementById("progress").className = 'hide';
        }
    }

    // Increment the progress dialog one step
    function ProgressStepIt() {
        _progressAt++;
        if(_progressAt > _progressEnd) _progressAt = _progressAt % _progressEnd;
        ProgressUpdate();
    }

    // Update the progress dialog with the current state
    function ProgressUpdate() {
        var n = (_progressWidth / _progressEnd) * _progressAt;
        if (document.all) {    // Internet Explorer
            var bar = document.all["dialog"].document.getElementById("bar");
            //var bar = dialog.bar;
            //Above line is modified by Nilesh on 23-July-2007
         } else if (document.layers) {    // Netscape         
            var bar = document.layers["progress"].document.forms["dialog"].bar;
            n = n * 0.55;    // characters are larger
        } else if (document.getElementById){        
                    var bar=document.dialog.bar
            }
        var temp = _progressBar.substring(0, n);
        bar.value = temp;
    }

    // Demonstrate a use of the progress dialog.
    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);
      //return true;
    }
</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">

// Create layer for progress dialog
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)  // Microsoft, NS6
  document.write(" bar.style=\"color:navy;\">");
else // Netscape
  document.write(">");
document.write("</TD></TR>");
document.write("</TABLE>");
document.write("</FORM>");
document.write("</span>");
ProgressDestroy(); // Hides 

</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.