Building data-driven web apps with Pyramid and SQLAlchemy Transcripts
Chapter: Introducing the Pyramid framework
Lecture: Building block: Dynamic HTML Templates
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The final building block
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that we're going to talk about here are templates.
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Templates are super important.
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They let us define in an HTML-like fashion
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the general markup for our site
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and then add little bits of
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dynamic behavior to it.
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There's actually three choices we can use
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for the template language.
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We can use Mako,
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we can use Jinja2,
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or we can use Chameleon templates.
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This is a Chameleon template here,
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and I'll talk later about why
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I think Chameleon is the right choice.
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But let's just see how this works.
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It's kind of the same for all the template languages.
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So what we're going to do is we saw that we passed
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a model over that had packages, right.
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One of the keys in the model was packages,
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and the value was actually a list of packages.
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We're going to use tal:repeat and I'm going to say
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for every package in packages,
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I want to replicate this HTML block,
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including the DIV that has the tal:repeat on it.
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So we'll have a DIV containing a hyperlink
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in a span for every package.
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And then for the hyperlink
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we need to set the URL,
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so within this little repeat loop
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we can say p.url,
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p.name and so on.
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And then we're going to show the summary
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but only if the summary exists.
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Like if there's an empty summary or it's not set,
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then we're not going to show it.
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So you can see that if we want to take some sort of text
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or anything and get a string version of it
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and just plunk it into the page,
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we'll use dollar curly expression.
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We can do these conditions with tal:condition
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and so on.
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Often when we take this
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and actually pass that data to it and render it,
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that pyramid render it,
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it's going to look like this:
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requests, Http For Humans, boto3, AWS API
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and SQLAlchemy and so on.
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Cause that was the model of the three packaged requests
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Boto3 and SQLAlchemay passed along to this template.
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So that's what its going to look like.
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Unstyled and ugly of course,
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we're going to work on that later.
