Breadcrumb for Blogger

Breadcrumbs or breadcrumb trail is a navigation aid used in user interfaces. It gives users a way to keep track of their location within programs or documents. The term comes from the trail of breadcrumbs left by Hansel and Gretel in the popular fairytale.

The trails like Home » Label » Post Name are the breadcrumbs.

Here is a screenshot of a Breadcrumb Trail

Now that you know what a breadcrumb is , let us get into the details of adding the same to your Blogger Blog.

1. Go to Template > Edit HTML and  check the check box which says Expand the Widget Templates.

2. Now in the Template, Find

<b:include data='top' name='status-message'/>

and immediately above that, paste this line of code

<b:include data='posts' name='breadcrumb'/>

3. Now find

<b:includable id='main' var='top'>

If you find two occurrences of this, then locate the second one(locate the only one otherwise) and immediately above that paste this code snippet

<b:includable id='breadcrumb' var='posts'>
<b:if cond='data:blog.homepageUrl != data:blog.url'>
<b:if cond='data:blog.pageType == "static_page"'>
<div class='breadcrumbs'><span><a expr:href='data:blog.homepageUrl' rel='tag'>Home</a></span> » <span><data:blog.pageName/></span></div>
<b:else/>
<b:if cond='data:blog.pageType == "item"'>
<!-- breadcrumb for the post page -->
<b:loop values='data:posts' var='post'>
<b:if cond='data:post.labels'>
<div class='breadcrumbs' xmlns:v="http://rdf.data-vocabulary.org/#">
<span typeof="v:Breadcrumb"><a expr:href='data:blog.homepageUrl' rel="v:url" property="v:title">Home</a></span>
<b:loop values='data:post.labels' var='label'>
<b:if cond='data:label.isLast == "true"'>
 » <span typeof="v:Breadcrumb"><a expr:href='data:label.url' rel="v:url" property="v:title"><data:label.name/></a></span>
</b:if>
</b:loop>
 » <span><data:post.title/></span>
</div>
<b:else/>
<div class='breadcrumbs'><span><a expr:href='data:blog.homepageUrl' rel='tag'>Home</a></span> » <span>Unlabelled</span> » <span><data:post.title/></span></div>
</b:if>
</b:loop>
<b:else/>
<b:if cond='data:blog.pageType == "archive"'>
<!-- breadcrumb for the label archive page and search pages.. -->
<div class='breadcrumbs'>
<span><a expr:href='data:blog.homepageUrl'>Home</a></span> » <span>Archives for <data:blog.pageName/></span>
</div>
<b:else/>
<b:if cond='data:blog.pageType == "index"'>
<div class='breadcrumbs'>
<b:if cond='data:blog.pageName == ""'>
<span><a expr:href='data:blog.homepageUrl'>Home</a></span> » <span>All posts</span>
<b:else/>
<span><a expr:href='data:blog.homepageUrl'>Home</a></span> » <span>Posts filed under <data:blog.pageName/></span>
</b:if>
</div>
</b:if>
</b:if>
</b:if>
</b:if>
</b:if>
</b:includable>

This code will only display the last label of the post in the breadcrumb. If you want to display all the labels, then you will have to remove those 2 green lines of code.

4. Save the Template

5. If you want to make the breadcrumb smaller then go to Template Designer > Advanced > Add CSS and add the following Snippet there and Apply the changes

.breadcrumbs {
padding:5px 5px 5px 0px;
margin: 0px 0px 15px 0px;
font-size:95%;
line-height: 1.4em;
border-bottom:3px double #e6e4e3;
}

Now you should have a working breadcrumb navigation on your system. The original breadcrumb idea is based on Hoctro's Code from HOCTRO  breadcrumb hack. It has been modified to accommodate Search Pages, Label Pages and Archives.The post breadcrumb uses RDF breadcrumb Markup to assist you in displaying breadcrumbs in Google Search Results.

Source: http://www.bloggerplugins.org/2009/06/breadcrumb-for-blogger-blogspot.html