What is Jade? | Web Development with Jade

Compiling Jade

Now that you have Jade installed, you can use the jade command to compile Jade files. For example, if we put some Jade in a file:

$ echo "h1 Some Jade" > file.jade

Then we can use the jade command to render that file.

$ jade file.jade

  rendered file.html

This will create file.html, as shown:

$ cat file.html
<h1>Some Jade</h1>

By default, jade compiles and renders the file, but if we only want it to compile into JS, we can use the --client argument, as shown:

$ jade --client file.jade

  rendered file.js

$ cat file.js
function anonymous(locals) {
jade.debug = [{ lineno: 1, filename: "file.jade" }];
try {
var buf = [];
jade.debug.unshift({ lineno: 1, filename: jade.debug[0].filename });
jade.debug.unshift({ lineno: 1, filename: jade.debug[0].filename });
buf.push("<h1>");
jade.debug.unshift({ lineno: undefined, filename: jade.debug[0].filename });
jade.debug.unshift({ lineno: 1, filename: jade.debug[0].filename });
buf.push("Some Jade");
jade.debug.shift();
jade.debug.shift();
buf.push("</h1>");
jade.debug.shift();
jade.debug.shift();;return buf.join("");
} catch (err) {
  jade.rethrow(err, jade.debug[0].filename, jade.debug[0].lineno,"h1 Some Jade\n");
}
}

This results in some very ugly JS, mostly due to the debugging information. We can remove that debugging information with the --no-debug argument.

$ jade --client --no-debug file.jade

  rendered file.js

$ cat file.js
function anonymous(locals) {
var buf = [];
buf.push("<h1>Some Jade</h1>");;return buf.join("");
}

The JS resulting from that could still be optimized a little bit more (and likely will be in future versions of the compiler), but because it's just machine-generated JS, it's not a huge issue. The important part is that this JS can be executed on the client side to render templates dynamically. This will be covered more in Chapter 4, Logic in Templates.

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Web Development with Jade

By : Sean Lang

Web Development with Jade

By: Sean Lang

Overview of this book

Compiling Jade

Tip

Web Development with Jade

By : Sean Lang

Web Development with Jade

By: Sean Lang

Overview of this book

Compiling Jade

Tip

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