Using the HTML 5 Filesystem API to Uplode a File

Manish Singh
May 19, 2012
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Introduction

This is a simple article for beginners developing with HTML 5 that helps to understand how to upload a file in a browser using HTML 5 tools. We know that HTML is the client side scripting language that helps display the data in a browser. We know that HTML is an acronym for "Hyper Text Markup Language" used to display data in a browser. HTML 5 is the advanced version of HTML. HTML5 will be the new standard for HTML, XHTML, and the HTML DOM. HTML 5 is the advanced version of HTML used to develop 3D or multimedia applications.

Step 1 : First open a HTML editor such as Visual Studio.

Open start->Notepad.

The name of editor is "Michael".

Step 2 : Add a Folder on Desktop.

Right-click on desktop.

new->add folder.

Step 3 : Open Visual Studio.

Go to file -> New->Projects.

Create an ASP. NET Web Application.

Name of "File.aspx".

Step 4 : Add a HTML file to your web application.

Right-click of Solution Explorer.

Add->add new item->HTML form.

Name of HTML form is "File.html"

Step 5 : Set the script browser a data on a File.

Code

<script>
document.querySelector('input[type="file"]').addEventListener('change', function(e) {
var files = this.files;
loadInlineEffort('#fileListEffort', function(Effort) {
    Effort.onmessage = function(e) {
      console.log(e.data);
    };
    for (var i = 0, file; file = files[i]; ++i) {

Step 6 : Set the functionality Fetching the entries of a File.

code

<script>
Win.resolveLocalFileSystemURL =
window.resolveLocalFileSystemURL ||
Win.webkitResolveLocalFileSystemURL;
    var ctx = new ctx('ctx.js');
    ctx.onmessage = function (e) {
        var ver = e.data.entries;
        ver.forEach(function (url, i) {
        Win.resolveLocalFileSystemURL(url, function (fileEntry) {
                console.log(fileEntry.name);
            });
        });
    };
    ctx.postMessage({ 'cmd': 'list' });
</script>
</body>

Step 7 : Set a functionality download the data on a browser.

Code

<script>
  var ctx = new ctx('downloader.js');
    ctx.onmessage = function (e) {
        console.log(e.data);
    };
    ctx.postMessage({ fileName: 'CShorpCorner',
        url: 'cshorpcorner.png', type: 'image/png'
    });
</script>

Step 8 : The final code of application is given below.

Code

<html>
<head>
<title>Uplode a file using html 5</title>
<script type="javascript/Effort" id="fileListEffort">
self.onmessage = function(e) {
    postMessage(e.data);
};
</script>
</head>
<body>
<input type="file" multiple>
<script>
document.querySelector('input[type="file"]').addEventListener('change', function(e) {
var files = this.files;
loadInlineEffort('#fileListEffort', function(Effort) {
    Effort.onmessage = function(e) {
      console.log(e.data);
    };
    for (var i = 0, file; file = files[i]; ++i) {
      var CTX = new FileCTX();
      CTX.onload = function(e) {
        console.log(this.result);
      };
      CTX.onerror = function(e) {
        console.log(e);
      };
      CTX.readAsArrayBuffer(file);
    }
});
}, false);
function loadInlineEffort(selector, callback) {
Win.URL =Win.URL ||Win.webkitURL || null;
Win.BlobBuilder =Win.WebKitBlobBuilder ||
                   Win.MozBlobBuilder ||Win.BlobBuilder;
var script = document.querySelector(selector);
if (script.type === 'javascript/Effort') {
    var bb = new BlobBuilder();
    bb.append(script.textContent);
    callback(new Effort(window.URL.createObjectURL(bb.getBlob()));
}
}
</script>
</body>
</html>