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POMeaning of Dollar Sign & Curly Braces Containing Javascript Block Outside of HTML Script Tag
 

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  1. POMeaning of Dollar Sign & Curly Braces Containing Javascript Block Outside of HTML Script Tag
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    <p>I'm currently reading <strong>'Javascript Web Applications' (O'Reilly, Alex MacCaw)</strong> and very early on there's a code snippet which might appear to execute a JS function, within an HTML document, yet it is not enclosed by <code>&lt;script&gt;</code> tags:</p> <pre><code>// template.html &lt;div&gt; &lt;script&gt; function doSomething(aParam) { /* do stuff ... */ }; &lt;/script&gt; ${ doSomething(this.someX) } &lt;/div&gt; </code></pre> <p>Please could someone kindly explain the <strong>dollar-sign-curly-brace notation</strong>? I'm currently learning JS and I haven't seen this before, so I'm presuming it's either JS shorthand for code execution (if so, why no terminating semi-colon?), or perhaps some proprietary <strong>templating</strong> mark-up (Ruby? PHP?), or something else entirely?</p> <p>Many thanks.</p> <p><strong>UPDATE</strong></p> <p>It transpires that later on in Chapter 5 (of the aforementioned book) we are then introduced to <strong>Javascript templating</strong>. It appears to be an assumption by the author that the reader has already encountered this templating technique before reading the book. As noted by <strong>Stackoverflow member Esailija</strong>, this book is <strong><em>not</em></strong> a beginners' guide to Javascript; I should add that I'm reading this book in parallel with <strong>'Javascript: The Good Parts' (O'Reilly, Douglas Crockford)</strong> amongst others.</p> <p><em>I had half-suspected some kind of templating, but I hadn't considered pure JS templating. I have used PHP and RoR frameworks in the past which also used similar templating concepts for injecting model data into views.</em></p> <p>One final point: my reason(s) for reading <strong>'Javascript Web Applications'</strong> is that it discusses the Model-View-Controller (MVC) pattern within the JS sphere. While it advocates the use of the <strong>jQuery library</strong> (among others) to both enhance and accelerate development, it is not a <strong><em>jQuery API book</em></strong> or yet-another-new-javascript-wrapper; rather, the book makes use of such libraries (where appropriate) to deal with cross-browser JS inconsistencies, while driving home actual JS best practices and patterns in creating 'web applications'.</p>
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