How do I check href attribute and if needed add full url address?

I want to check the href attribute and if it does not contain the full path, I want to replace it with full URL? Should I use JavaScript which does that but don't work on IE 8?

My JS:

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fullUrl = $(this).filter('[href^='+document.location.protocol+']').attr('href') 
    ? true : false;

url = fullUrl ? 
    $(this).filter('[href^='+document.location.protocol+']').attr('href') 
    : document.location.protocol + '//' + document.domain + $(this).attr('href');

I need to check if href contain full url or not:

href: "/path/other.html" (part)

href:"http://domain.com/path/other.html" (full url)

And then if i have part url href, i must add domain and recreate href to full url!

---

The full url is available via the .href property.

Typically there's no need to set it to the attribute, but if you want to, you could do this:

$('a[href]').attr('href', function() { return this.href; });

This finds all <a> elements that have an href attribute, and updates its href using the attr()^[docs] method by passing a function as the second parameter, which returns the value of the .href property.

---

If you just wanted a list of them, you can use the map()^[docs] method.

var hrefs = $('a[href]').map(function() { return this.href; }).get();

Example: http://jsfiddle.net/EDhhD/

---

EDIT:

If you want to explicitly check that the path isn't already the full path, just add an if statement to my first example.

$('a[href]').attr('href', function(i,hrf) { 
    if( hrf.indexOf( 'http' ) !== 0 ) return this.href; 
});

---

I guess you want this:

$(this).attr('href', function(i, v) {
    if ( v.indexOf('http:') === -1 ) {
        v = document.location.protocol + '//' + document.domain + '/' + v; 
    }
    return v;
});

Live demo: http://jsfiddle.net/simevidas/bwmQ5/

---

I don't think you can get a meaningful result of calling attr on multiple items. You should do your check/replacement in a loop, one item at a time:

$(this).filter('[href^='+document.location.protocol+']').each(function(){
    var fullUrl = $(this).attr('href') ? true : false;
    var url = fullUrl ? $(this).attr('href') : document.location.protocol + '//' + document.domain + $(this).attr('href');
    alert(url);
});

---

This solution will ensure all anchors on your page have the protocol in the href:

$(document).ready(function()
{  
    var str_len = document.location.protocol.length;
    $('a').each(function()
    {
        if($(this).attr('href').substring(0,str_len) != document.location.protocol)
        {
            $(this).attr('href',document.location.protocol + '//' + $(this).attr('href'));
        }
    });
});

http://jsfiddle.net/3XQXL/