amnuts » snippet

Easy table sorting with jQuery

Andy — Thu, 29 Jan 2009 16:48:32 +0000

I came across a jQuery plug-in the other day to sort tables, and it works great and is exceptionally simple to implement (and as anyone who’s flicked through this blog knows, I like the simple things in life… Don’t need any more gray hairs popping up, you know!).

The plug-in is called tablesorter (found at tablesorter.com), by Christian Bach.

As I mentioned, it’s really simple to implement:

    $("table.sortable").tablesorter();

But also gives you the ability to add extra functionality by the use of ‘widgets’. One example of a widget from the tablesorter site is to add headers every number of rows. Here’s my rather paltry contribution to the widgets – highlighting rows when you hover over them.

$.tablesorter.addWidget({
    id: "highlightOnHover",
    format: function(table) {
        $("tbody tr.highlight", table).remove();
        $("tbody tr", table).hover(
            function(){ $(this).children("td").addClass("highlight"); },
            function(){ $(this).children("td").removeClass("highlight"); }
        );
    }
});

Simple pleasures with jQuery

Andy — Wed, 28 Jan 2009 10:22:50 +0000

Somethings it’s the simple things in life that make you really happy. For me yesterday, that was thanks to jQuery. Have you ever wanted to have a check box that, when the user checks it it also checks a lot of other checkboxes? Yeah, of course you have! I wanted to do that yesterday. Now, it’s not the first time I’ve had to do that kind of functionality, but it always came with a bunch of javascript that seemed over the top for what was wanted. With jQuery it just took a line or two of code!

    $(document).ready(function() {
        $('#selectall').click(function() {
        	$(":checkbox", $('#checkboxlist')).attr('checked', $(this).is(':checked'));
        });
    });

And with that, on and off go the other checkboxes.

Marvelous!

Force a file download

Andy — Wed, 24 Oct 2007 12:03:01 +0000

Here’s a small function that will allow you to force a file download.

/**
 * Force a file download via HTTP.
 *
 * File is required to be on the same server and accessible via a path.
 * If the file cannot be found or some other error occurs then a
 * '204 No content' header is sent.
 *
 * @param string $path Path and file name
 * @param string $name Name of file when saved on user's computer,
 *                     null for basename from path
 * @param string $type Content type header info (e.g., 'application/vnd.ms-excel')
 * @return void
 * @access public
 */
/* public static */ function download($path, $name = null, $type = 'binary/octet-stream')
{
    if (headers_sent()) {
        echo 'File download failure: HTTP headers have already been sent and cannot be changed.';
        exit;
    }

    $path = realpath($path);
    if ($path === false || !is_file($path) || !is_readable($path)) {
        header('HTTP/1.0 204 No Content');
        exit;
    }

    $name = (empty($name)) ? basename($path) : $name;
    $size = filesize($path);

    header('Expires: Mon, 20 May 1974 23:58:00 GMT');
    header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
    header('Cache-Control: no-store, no-cache, must-revalidate');
    header('Cache-Control: post-check=0, pre-check=0', false);
    header('Cache-Control: private');
    header('Pragma: no-cache');
    header("Content-Transfer-Encoding: binary");
    header("Content-type: {$type}");
    header("Content-length: {$size}");
    header("Content-disposition: attachment; filename=\"{$name}\"");
    readfile($path);
    exit;
}

Very easy to use, too! Here are some examples of how you might call the function:

download('./myfile.txt');

download(__FILE__, 'a file for you.php');

download('/home/you/files/spreadsheet.xml', 'ssheet_' . date('Ymd'), 'application/vnd.ms-excel');