A loop is a sequence of instruction s that is continually repeated until a certain condition is reached. Typically, a certain process is done, such as getting an item of data and changing it, and then some condition is checked such as whether a counter has reached a prescribed number. In the Blogger Language , a loop is implemented using the tag <b:loop>. Most commonly used for printing out each post in a list of posts for a given page, or each comment, or each label, etc.
<b:loop> Syntax and Attributes
BLOGGER XML LANGUAGE
<b:loop index='STRING'
values='ARRAY'
var='STRING'
reverse='BOOLEAN'>
<!-- Repeat -->
</b:loop>- values attribute value can be expression resulting an Array.
- index with string value will give index number of each result starting from 0.
- reverse mean to display result from backward.
- reverse is not necessary. The default is not visible which mean 'false'.
<b:loop> Example
POST ARTICLE
<b:loop index='i' values='data:posts' var='post'>
<div>
<h3>
<b:eval expr='data:i + 1' />. <data:post.title />
</h3>
<div>
<data:post.body />
</div>
</div>
</b:loop>
<b:if> Index with the name i, transform into data: and got <b:eval> tag, will evaluate with expression expr:'data:i + 1'. This will evaluate starting value 0 + 1.
HTML RENDERED RESULT
1. This is Post Title
WITH STRING
<ul>
<b:loop values='["Bar","Baz","Qux"]' var='foo' >
<li>
<data:foo/>
</li>
</b:loop>
</ul>The data Bar, Baz, and Qux will be printed as result by calling <data:foo/>