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<h1 class="title">GenieFramework Microblog Part 1</h1>
<div class="quarto-categories">
<div class="quarto-category">Julia</div>
<div class="quarto-category">dataViz</div>
<div class="quarto-category">GenieFramework</div>
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<div class="quarto-title-meta-heading">Author</div>
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<p><a href="https://kyleb.rbind.io/">Kyle Belanger</a> </p>
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<div class="quarto-title-meta-heading">Published</div>
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<p class="date">August 27, 2024</p>
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<h2 id="toc-title">Table of contents</h2>
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<li><a href="#introduction" id="toc-introduction" class="nav-link active" data-scroll-target="#introduction">Introduction</a></li>
<li><a href="#getting-started" id="toc-getting-started" class="nav-link" data-scroll-target="#getting-started">Getting Started</a></li>
<li><a href="#creating-the-app" id="toc-creating-the-app" class="nav-link" data-scroll-target="#creating-the-app">Creating The App</a></li>
<li><a href="#creating-a-hello-world-genie-app" id="toc-creating-a-hello-world-genie-app" class="nav-link" data-scroll-target="#creating-a-hello-world-genie-app">Creating a Hello World Genie App</a></li>
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<section id="introduction" class="level2">
<h2 class="anchored" data-anchor-id="introduction">Introduction</h2>
<p>Quite some time ago I started attempting to learn python and web development. I claim in no way to be even close to an expert on either one of those things, in fact I am truly a beginner at both. While I never continued with python I have always enjoyed web development, creating quite a few small R Shiny apps along the way. As I have decided to learn Julia I am instantly drawn to Web Development, and I decided to try out the Genie Framework. While there exist some tutorials on the web, I find the all contain small pieces of information but lack putting everything together. Form my learning python days, I know that there exists a WONDERFUL tutorial for the python Flask framework (<a href="https://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world">Found Here</a>). I decided to challenge myself and recreate his website using Genie, and the Model, View, Controller model. I will attempt to document what I do to try and help others along the way. As stated above I AM NOT AN EXPERT, so at any time there is a good chance I am not doing something the best way possible! I encourage everyone to follow along and make suggestions for improvements. I am going to try my best to go in the order Miguel did, but for some chapters I will skip sections or combine things as needed to make them work for the framework.</p>
</section>
<section id="getting-started" class="level2">
<h2 class="anchored" data-anchor-id="getting-started">Getting Started</h2>
<p>Miguel’s blog does a great job of going into installing python and flask as well as setting up virtual environments in python. I am going to skip most of this as there is great documentation out there on how to install Julia and set up a project (Genie will actually take care of this for us). Instead I will link here what I would say are the three prerequisites for getting started.</p>
<ul>
<li><a href="https://julialang.org/downloads/">Download and install Julia</a></li>
<li>The IDE of your choice (I use VSCode, and the <a href="https://marketplace.visualstudio.com/items?itemName=julialang.language-julia">Julia Extension</a>)</li>
<li>Add Genie to your Julia environment (see below)</li>
</ul>
<p>To add Genie to your Julia environment, open the Julia REPL and type the following:</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode julia code-with-copy"><code class="sourceCode julia"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a>pkg<span class="op">></span> add Genie <span class="co"># press ] from julia> prompt to enter Pkg mode</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</section>
<section id="creating-the-app" class="level2">
<h2 class="anchored" data-anchor-id="creating-the-app">Creating The App</h2>
<p>Genie will take care of creating a new directory for us, but we will want to open the Julia REPL from whatever directory we want the app folder to live in. Once that has been decided open a Julia REPL and type the following:</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode julia code-with-copy"><code class="sourceCode julia"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>julia<span class="op">></span> <span class="im">using</span> <span class="bu">Genie</span></span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a>julia<span class="op">></span> Genie.Generator.<span class="fu">newapp</span>(<span class="st">"Microblog"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>Upon executing the command, Genie will:</p>
<ul>
<li>make a new dir called <code>Microblog</code> and <code>cd()</code> into it,</li>
<li>install all the app’s dependencies</li>
<li>create a new Julia project (adding the Project.toml and Manifest.toml files),</li>
<li>activate the project,</li>
<li>automatically load the new app’s environment into the REPL,</li>
<li>start the web server on the default Genie port (port 8000) and host (127.0.0.1 – aka <code>localhost</code>).</li>
</ul>
<p>At this point you can confirm that everything worked as expected by visiting <a href="http://127.0.0.1:8000">http://127.0.0.1:8000</a> in your favorite web browser. You should see Genie’s welcome page. If at any point you want to exit the REPL and reload the app perform the following:</p>
<div class="sourceCode" id="cb3"><pre class="sourceCode julia code-with-copy"><code class="sourceCode julia"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>julia<span class="op">></span> <span class="im">using</span> <span class="bu">Genie</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a>julia<span class="op">></span> Genie.<span class="fu">loadapp</span>()</span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a>julia<span class="op">></span> <span class="fu">up</span>()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>This will reload the app and activate the web server. You can again visit <a href="http://127.0.0.1:8000">http://127.0.0.1:8000</a> to test that everything is working.</p>
</section>
<section id="creating-a-hello-world-genie-app" class="level2">
<h2 class="anchored" data-anchor-id="creating-a-hello-world-genie-app">Creating a Hello World Genie App</h2>
<p>While Genie by default has a welcome page, lets change it to a simple Hello World page to make the app our own. Open routes.jl and change the “/” route to the following:</p>
<div class="code-with-filename">
<div class="code-with-filename-file">
<pre><strong>routes.jl</strong></pre>
</div>
<div class="sourceCode" id="cb4" data-filename="routes.jl"><pre class="sourceCode julia code-with-copy"><code class="sourceCode julia"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="fu">route</span>(<span class="st">"/"</span>) <span class="cf">do</span></span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a> <span class="st">"Hello World!"</span></span>
<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="cf">end</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>If we go to <a href="http://127.0.0.1:8000">http://127.0.0.1:8000</a> we should now see the following:</p>
<div class="quarto-figure quarto-figure-center">
<figure class="figure">
<p><img src="helloworldscreenshot.png" class="img-fluid figure-img"></p>
<figcaption>Hello World Screenshot</figcaption>
</figure>
</div>
</section>
<div id="quarto-appendix" class="default"><section class="quarto-appendix-contents" id="quarto-reuse"><h2 class="anchored quarto-appendix-heading">Reuse</h2><div class="quarto-appendix-contents"><div><a rel="license" href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a></div></div></section><section class="quarto-appendix-contents" id="quarto-citation"><h2 class="anchored quarto-appendix-heading">Citation</h2><div><div class="quarto-appendix-secondary-label">BibTeX citation:</div><pre class="sourceCode code-with-copy quarto-appendix-bibtex"><code class="sourceCode bibtex">@online{belanger2024,
author = {Belanger, Kyle},
title = {GenieFramework {Microblog} {Part} 1},
date = {2024-08-27},
langid = {en}
}
</code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre><div class="quarto-appendix-secondary-label">For attribution, please cite this work as:</div><div id="ref-belanger2024" class="csl-entry quarto-appendix-citeas" role="listitem">
Belanger, Kyle. 2024. <span>“GenieFramework Microblog Part 1.”</span>
August 27, 2024.
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// (since there is no id in the URL)
// remove the first header
if (note.children.length > 0 && note.children[0].tagName === "HEADER") {
note.children[0].remove();
}
const html = processXRef(null, note);
instance.setContent(html);
}
}).finally(() => {
instance.enable();
instance.show();
});
}
}, function(instance) {
});
}
let selectedAnnoteEl;
const selectorForAnnotation = ( cell, annotation) => {
let cellAttr = 'data-code-cell="' + cell + '"';
let lineAttr = 'data-code-annotation="' + annotation + '"';
const selector = 'span[' + cellAttr + '][' + lineAttr + ']';
return selector;
}
const selectCodeLines = (annoteEl) => {
const doc = window.document;
const targetCell = annoteEl.getAttribute("data-target-cell");
const targetAnnotation = annoteEl.getAttribute("data-target-annotation");
const annoteSpan = window.document.querySelector(selectorForAnnotation(targetCell, targetAnnotation));
const lines = annoteSpan.getAttribute("data-code-lines").split(",");
const lineIds = lines.map((line) => {
return targetCell + "-" + line;
})
let top = null;
let height = null;
let parent = null;
if (lineIds.length > 0) {
//compute the position of the single el (top and bottom and make a div)
const el = window.document.getElementById(lineIds[0]);
top = el.offsetTop;
height = el.offsetHeight;
parent = el.parentElement.parentElement;
if (lineIds.length > 1) {
const lastEl = window.document.getElementById(lineIds[lineIds.length - 1]);
const bottom = lastEl.offsetTop + lastEl.offsetHeight;
height = bottom - top;
}
if (top !== null && height !== null && parent !== null) {
// cook up a div (if necessary) and position it
let div = window.document.getElementById("code-annotation-line-highlight");
if (div === null) {
div = window.document.createElement("div");
div.setAttribute("id", "code-annotation-line-highlight");
div.style.position = 'absolute';
parent.appendChild(div);
}
div.style.top = top - 2 + "px";
div.style.height = height + 4 + "px";
div.style.left = 0;
let gutterDiv = window.document.getElementById("code-annotation-line-highlight-gutter");
if (gutterDiv === null) {
gutterDiv = window.document.createElement("div");
gutterDiv.setAttribute("id", "code-annotation-line-highlight-gutter");
gutterDiv.style.position = 'absolute';
const codeCell = window.document.getElementById(targetCell);
const gutter = codeCell.querySelector('.code-annotation-gutter');
gutter.appendChild(gutterDiv);
}
gutterDiv.style.top = top - 2 + "px";
gutterDiv.style.height = height + 4 + "px";
}
selectedAnnoteEl = annoteEl;
}
};
const unselectCodeLines = () => {
const elementsIds = ["code-annotation-line-highlight", "code-annotation-line-highlight-gutter"];
elementsIds.forEach((elId) => {
const div = window.document.getElementById(elId);
if (div) {
div.remove();
}
});
selectedAnnoteEl = undefined;
};
// Handle positioning of the toggle
window.addEventListener(
"resize",
throttle(() => {
elRect = undefined;
if (selectedAnnoteEl) {
selectCodeLines(selectedAnnoteEl);
}
}, 10)
);
function throttle(fn, ms) {
let throttle = false;
let timer;
return (...args) => {
if(!throttle) { // first call gets through
fn.apply(this, args);
throttle = true;
} else { // all the others get throttled
if(timer) clearTimeout(timer); // cancel #2
timer = setTimeout(() => {
fn.apply(this, args);
timer = throttle = false;
}, ms);
}
};
}
// Attach click handler to the DT
const annoteDls = window.document.querySelectorAll('dt[data-target-cell]');
for (const annoteDlNode of annoteDls) {
annoteDlNode.addEventListener('click', (event) => {
const clickedEl = event.target;
if (clickedEl !== selectedAnnoteEl) {
unselectCodeLines();
const activeEl = window.document.querySelector('dt[data-target-cell].code-annotation-active');
if (activeEl) {
activeEl.classList.remove('code-annotation-active');
}
selectCodeLines(clickedEl);
clickedEl.classList.add('code-annotation-active');
} else {
// Unselect the line
unselectCodeLines();
clickedEl.classList.remove('code-annotation-active');
}
});
}
const findCites = (el) => {
const parentEl = el.parentElement;
if (parentEl) {
const cites = parentEl.dataset.cites;
if (cites) {
return {
el,
cites: cites.split(' ')
};
} else {
return findCites(el.parentElement)
}
} else {
return undefined;
}
};
var bibliorefs = window.document.querySelectorAll('a[role="doc-biblioref"]');
for (var i=0; i<bibliorefs.length; i++) {
const ref = bibliorefs[i];
const citeInfo = findCites(ref);
if (citeInfo) {
tippyHover(citeInfo.el, function() {
var popup = window.document.createElement('div');
citeInfo.cites.forEach(function(cite) {
var citeDiv = window.document.createElement('div');
citeDiv.classList.add('hanging-indent');
citeDiv.classList.add('csl-entry');
var biblioDiv = window.document.getElementById('ref-' + cite);
if (biblioDiv) {
citeDiv.innerHTML = biblioDiv.innerHTML;
}
popup.appendChild(citeDiv);
});
return popup.innerHTML;
});
}
}
});
</script>
</div> <!-- /content -->
</body></html>