How can I unzip files with JavaScript and display their contents in a web browser?

How to Unzip Files with JavaScript

You want to display OpenOffice files (.odt and .odp) in a web browser at the client side. However, these files are zipped, and you're not able to unzip them using inflate.js.

To solve this issue, you can use the following alternative solution:

The provided JavaScript code includes an unzipper that allows you to handle zipped files efficiently. It utilizes the binary file reader and inflate logic to unzip files. The ZipFile class is responsible for handling the unzipping process.

Here's a breakdown of how the unzipper works:

1. Initialize the ZipFile Object:

<code class="javascript">var zipFile = new ZipFile(url, doneReading);</code>

2. Extract Entries:

<code class="javascript">var extractCb = function(id) {
    // this callback is invoked with the entry name, and entry text
    // in my demo, the text is just injected into an accordion panel.
    return (function(entryName, entryText){
        var content = entryText.replace(new RegExp( "\n", "g" ), "<br>");
        $("#"+id).html(content);
        $("#status").append("extract cb, entry(" + entryName + ")  id(" + id + ")<br>");
        $('#report').accordion('destroy');
        $('#report').accordion({collapsible:true, active:false});
    });
}</code>

For each entry in the zip file, the unzipper extracts the content and uses an asynchronous callback to handle the extracted data.

3. Display Extracted Data:
In the provided example, the extracted data is displayed in an accordion panel. However, you can customize this step to fit your requirements.

Features and Limitations:

• This solution is capable of handling binary and text files.
• It supports UTF-8 encoded filenames.
• It doesn't handle all zip file options, such as encryption or Zip64.
• It can be slow for large zip files due to the asynchronous nature of JavaScript.

Conclusion:

The provided JavaScript solution allows you to unzip files efficiently and display them on the client side. It's a good option when you need to work with zipped files in a web browser, but keep in mind its limitations and choose the approach that best suits your specific requirements.

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