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Neha  Jaggi / Professional / Web Technology

 
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Lessons:-Partials

  Partials

Although the layout in Listing 5.1 serves its purpose, it’s getting a little cluttered. The HTML shim takes up three lines and uses weird IE-specific syntax, so it would be nice

 

                      

                             

 

to tuck it away somewhere on its own. In addition, the header HTML forms a logical unit, so it should all be packaged up in one place. The way to achieve this in Rails is to use a facility called partials. Let’s first take a look at what the layout looks like after the partials are defined (Listing 5.8).

 

Listing 5.8 The site layout with partials for the stylesheets and header.
app/views/layouts/application.html.erb

              

                               

                                   

 

                  In Listing 5.8, we’ve replaced the HTML shim stylesheet lines with a single call to a Rails helper called render:

< % =   render   'layouts/shim'   %>

 

Theeffect of this lineis to look for a file called app/views/layouts/_shim.html.erb, evaluateits contents, and insert theresults into the view.6 (Recall that <%= ... %> is the embedded Ruby syntax needed to evaluate a Ruby expression and then insert the results into the template.) Note the leading underscore on the filename _shim.html.erb; this underscore is the universal convention for naming partials and, among other things, makes it possible to identify all the partials in a directory at a glance. 

                     Of course, to get the partial to work, we have to fill it with some content; in the case of the shim partial, this is just the three lines of shim code from Listing 5.1; the result appears in Listing 5.9.  

 

Listing 5.9 A partial for the HTML shim.
app/views/layouts/_shim.html.erb

 

<!--[if lt IE 9]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->

 

Similarly, we can move the header material into the partial shown in Listing 5.10 and insert it into the layout with another call to render.

 
 
 
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Neha  Jaggi

Skills    Ruby On Rails

Qualifications :- High School - , College/University - Graphic Era Hill University, Dehradun, College/University - ,
Location :-Dehradun,Dehradun,UTTARAKHAND,India
Description:-

Experienced Software Developer with a demonstrated history of working in the Information Technology and services industry. Skilled in Web Technologies (Ruby on Rails, PostgreSQL, php, Laravel and AJAX). 


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