Building data-driven web apps with Pyramid and SQLAlchemy Transcripts
Chapter: Chameleon templates
Lecture: Layout: Motivation
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We saw that our view was actually broken into two parts.
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And it was using what I'm going to call
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a shared layout master template.
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Let's look into this.
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So what is the concept here
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why do we have this layout page?
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Let's look at a real world site, say talkpython.fm
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This site is built with pyramid and it uses this concept.
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So over here you can see that I've got this home page
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this is just the main index page on the site.
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And it's got this big hero section
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with episodes and last episode and so on.
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And it's got this navigation across the top.
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But as you move around the site
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you'll see it has the same basic look and feel.
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Navigation bit and the branding
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and the Rollbar stuff is there
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but the content of the page changed.
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You go into an episode, same thing.
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But at the top, the same stuff is coming along.
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Also what you can't see but is happening
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the same Javascript, the same CSS
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and lots of other things like that
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like the RSS feed indicator in a metatag.
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All of that is being shared across these.
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It's the layout page that makes sure that this is consistent
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and automatic on every single page.
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In order to implement a new page
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all I have to do is figure out what goes in the middle.
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And it's wrapped up by the design.
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If the design changes, it changes across everything.
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No muss, no fuss, it's super easy.
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It's important to realize
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that this is more than just look and feel
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so that you have consistent head meta information, right?
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There might be description, there might be a title
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there's all sorts of stuff that goes up there
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included CSS, the correct order of the CSS
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and potentially even some javascript
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for single-page app type things like.
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Some of those go at the top, some go at the bottom.
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It's typical to put the noncritical javascript files
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at the bottom so that the page loads
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and half a second later the javascript stuff loads
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the first time and then of course it's cached, it's instant.
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We also have consistency analytics.
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You're sure that every single page includes your
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Google Analytics tag or your GetClicky tag
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things like that.
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And, you also have a controlled way
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to add on additional CSS and additional javascript
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and make sure every time that goes in
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exactly the right place.
