Question

EDIT, April 2013: Old code no longer nedeed. Use Tumblr’s new shortcodes for ‘like’ and ‘reblog’ buttons instead!

http://developers.tumblr.com/post/49193689915/attn-fantastic-theme-developers-tumblr-users-can

Old code:

I’m using @ThinkingStiff’s code (https://stackoverflow.com/a/9048446/351320).

Here’s the live example: http://themelab01.tumblr.com/

My html code:

    {block:Posts}
        {block:Text}
            <li id="{PostID}" class="post text">
                {block:Title}
                    <h3><a href="{Permalink}">{Title}</a></h3>
                {/block:Title}

                {Body}
            </li>
            <a href="{ReblogURL}" class="reblog">reblog</a>
            <a href="#" class="like">like</a>
        {/block:Text}

css

#like-it {
    display: none;
}
.liked, .like:hover {

    color: red !important;
}

js

$(document).on('click', '.like', function (event) {

    event.preventDefault();

    var command = $(this).hasClass('liked') ? 'unlike' : 'like',
        post = $(this).closest('.post'),
        oauth = post.find('.reblog').attr('href').slice(-8),
        id = post.attr('id'),
        likeUrl = 'http://www.tumblr.com/' + command + '/' + oauth + '?id=' + id;

    $('#like-it').attr('src', likeUrl);
    $(this).toggleClass('liked');

});

and the empty iframe is at the bottom of the page. However this isn’t working. When I click on ‘like’ the number of liked post in my dashboard increases (where it says “Liked n. posts) but the post does not appear in the Likes page and the text should stay red but it doesn’t. What am I missing?

Answer 1

I’ve updated my code recently to make it a cut and paste endeavor. This eliminates the need for jQuery and the post ID, two areas people always have trouble with.

The tutorial is here: http://like-button.tumblr.com

Cut and paste the following code block into your theme immediately before </head>. This will give you a like button on each post that looks like the default Tumblr grey heart. It will turn red when you hover over it and when you click it. If you click it again, it will turn grey again and delete the Like.

<style>
.my-like {
    background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAARCAYAAAA/mJfHAAABH0lEQVQ4y62T30vCUBiGv/9YuhBLkCA08FdogRFFYFEUhhZNCCQoSESiIOii68pl5qV6s8Eb7+SMHXNs6S7ejZ3zvA+ccT4BICofvS88dJ7w8vqG8WQC754K17lPjrx3z3l8D4YoVaqIrWbcJNbzaHefNZjfXPdy5b0jsO/IRqMxUpmSBnhz2bx1QL79GPbpEePmzhdSyW8fBDL0SK68HwiGCT2S3NiKREaPzP7QRRNPZSHpwm4kMnqkYbQikdEjZv8HK2ubS4nY75mD6WU8qzeXkrHvToBlWSjuHC4kYo99V8bwBnM0/iMiz542myq2bSPskcmR/zPos7lvP8Lv/nGd+/N6c2Xq2KcXhiY6qV1rxwotU3n/NHF8fgW+g9hfsHJlJUYljcgAAAAASUVORK5CYII=) !important;
    height:17px;
    width:19px;
    cursor:pointer;
    display:inline-block;
    vertical-align:top;
}
.my-liked, .my-like:hover {
    background-image: url(data:image/png;base64,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) !important;
    height:17px;
    width:19px;
    cursor:pointer;
    display:inline-block;
    vertical-align:top;
}
</style>
<script>
window.onload = function () {
document.body.insertAdjacentHTML( 'beforeEnd', '<iframe id="my-like-frame" style="display:none;"></iframe>' );
document.addEventListener( 'click', function ( event ) {
    var myLikeLink = event.target;
    if( myLikeLink.className.indexOf( 'my-like' ) > -1 ) {
        var myLikeFrame = document.getElementById( 'my-like-frame' ),
            liked = ( myLikeLink.className == 'my-liked' ),
            command = liked ? 'unlike' : 'like',
            reblog = myLikeLink.getAttribute( 'data-reblog' ),
            postId = myLikeLink.getAttribute( 'data-id' ),
            oauth = reblog.slice( -8 ),
            likeUrl = 'http://www.tumblr.com/' + command + '/' + oauth + '?id=' + postId;
        myLikeFrame.src = likeUrl;
        liked ? myLikeLink.className = 'my-like'
            : myLikeLink.className = 'my-liked';
    };
}, false );
};
</script>

Then cut and paste the following button code into your theme where you want your like button to be (this must be inside your {block:Posts} block).

Code:

<div class="my-like" data-reblog="{ReblogURL}" data-id="{PostID}"></div>