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laravel_forms_and_validation-speaker.html
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laravel_forms_and_validation-speaker.html
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<!DOCTYPE html>
<html lang="en"><head>
<script src="laravel_forms_and_validation_files/libs/clipboard/clipboard.min.js"></script>
<script src="laravel_forms_and_validation_files/libs/quarto-html/tabby.min.js"></script>
<script src="laravel_forms_and_validation_files/libs/quarto-html/popper.min.js"></script>
<script src="laravel_forms_and_validation_files/libs/quarto-html/tippy.umd.min.js"></script>
<link href="laravel_forms_and_validation_files/libs/quarto-html/tippy.css" rel="stylesheet">
<link href="laravel_forms_and_validation_files/libs/quarto-html/quarto-html.min.css" rel="stylesheet" data-mode="light">
<link href="laravel_forms_and_validation_files/libs/quarto-html/quarto-syntax-highlighting.css" rel="stylesheet" id="quarto-text-highlighting-styles"><meta charset="utf-8">
<meta name="generator" content="quarto-1.2.335">
<meta name="author" content="Vladimir Lelicanin - SAE Institute">
<title>Laravel Forms and Validation</title>
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
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<link rel="stylesheet" href="laravel_forms_and_validation_files/libs/revealjs/dist/reveal.css">
<style>
code{white-space: pre-wrap;}
span.smallcaps{font-variant: small-caps;}
div.columns{display: flex; gap: min(4vw, 1.5em);}
div.column{flex: auto; overflow-x: auto;}
div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
ul.task-list{list-style: none;}
ul.task-list li input[type="checkbox"] {
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margin: 0 0.8em 0.2em -1.6em;
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color: #aaaaaa;
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code span { color: #003b4f; } /* Normal */
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<style type="text/css">
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margin-top: 1em;
margin-bottom: 1em;
border-radius: .25rem;
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padding: 0em 0.5em;
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font-weight: 600;
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background-size: 1rem 1rem;
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width: 0.9rem;
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background-repeat: no-repeat;
background-size: 0.9rem 0.9rem;
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display: flex
}
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margin-top: 1rem;
padding-right: .5rem;
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}
div.callout-note.callout-style-default .callout-caption {
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div.callout-important {
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<div class="slides">
<section id="title-slide" data-background-image="https://keystoneacademic-res.cloudinary.com/image/upload/f_auto/q_auto/g_auto/w_256/element/15/156456_sae.jpg" data-background-position="top left" data-background-repeat="no-repeat" data-background-size="100px" class="quarto-title-block center">
<h1 class="title">Laravel Forms and Validation</h1>
<div class="quarto-title-authors">
<div class="quarto-title-author">
<div class="quarto-title-author-name">
Vladimir Lelicanin - SAE Institute
</div>
</div>
</div>
</section>
<section id="laravel-forms-and-validation" class="slide level1">
<h1>Laravel Forms and Validation</h1>
<h2 id="what-are-laravel-forms">What are Laravel Forms?</h2>
<ul>
<li>Laravel forms provide a convenient way to create HTML form elements with many built-in features.</li>
<li>Forms can include fields such as checkboxes, radio buttons, select lists, text areas, and text fields.</li>
<li>Forms can be used to gather data from users and send it to the server for processing.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/forms">https://laravel.com/docs/forms</a></p>
</section>
<section class="slide level1">
<h2 id="creating-a-basic-form-in-laravel">Creating a Basic Form in Laravel</h2>
<div class="sourceCode" id="cb1"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb1-1"><a href="#cb1-1"></a><span class="op"><</span>form method<span class="op">=</span><span class="st">"POST"</span> action<span class="op">=</span><span class="st">"/your-route"</span><span class="op">></span></span>
<span id="cb1-2"><a href="#cb1-2"></a> <span class="pp">@</span>csrf</span>
<span id="cb1-3"><a href="#cb1-3"></a> <span class="op"><</span>label <span class="cf">for</span><span class="op">=</span><span class="st">"name"</span><span class="op">></span><span class="cn">N</span>ame<span class="ot">:</span><span class="op"></</span>label<span class="op">></span></span>
<span id="cb1-4"><a href="#cb1-4"></a> <span class="op"><</span>input type<span class="op">=</span><span class="st">"text"</span> id<span class="op">=</span><span class="st">"name"</span> name<span class="op">=</span><span class="st">"name"</span><span class="op">></span></span>
<span id="cb1-5"><a href="#cb1-5"></a> <span class="op"><</span>input type<span class="op">=</span><span class="st">"submit"</span> value<span class="op">=</span><span class="st">"Submit"</span><span class="op">></span></span>
<span id="cb1-6"><a href="#cb1-6"></a><span class="op"></</span>form<span class="op">></span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li><code>@csrf</code> is a built-in Laravel directive that will generate a hidden input field with a CSRF token. This is used to protect against cross-site request forgery attacks.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="form-validation-in-laravel">Form Validation in Laravel</h2>
<ul>
<li>Form validation is the process of checking data submitted via a form to ensure it meets certain criteria (e.g. a field is not empty, an email address is in the correct format, etc).</li>
<li>Laravel provides a simple and intuitive way to validate form data.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/validation">https://laravel.com/docs/validation</a></p>
</section>
<section class="slide level1">
<h2 id="basic-form-validation-in-laravel">Basic Form Validation in Laravel</h2>
<div class="sourceCode" id="cb2"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb2-1"><a href="#cb2-1"></a><span class="kw">public</span> <span class="kw">function</span> store(<span class="cn">R</span>equest <span class="va">$request</span>)</span>
<span id="cb2-2"><a href="#cb2-2"></a>{</span>
<span id="cb2-3"><a href="#cb2-3"></a> <span class="va">$request</span>->validate([</span>
<span id="cb2-4"><a href="#cb2-4"></a> <span class="st">'name'</span> => <span class="st">'required'</span><span class="ot">,</span></span>
<span id="cb2-5"><a href="#cb2-5"></a> <span class="st">'email'</span> => <span class="st">'required|email'</span><span class="ot">,</span></span>
<span id="cb2-6"><a href="#cb2-6"></a> ])<span class="ot">;</span></span>
<span id="cb2-7"><a href="#cb2-7"></a></span>
<span id="cb2-8"><a href="#cb2-8"></a> <span class="co">// Store the data...</span></span>
<span id="cb2-9"><a href="#cb2-9"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>The <code>validate</code> method will automatically redirect the user back with an error message if the validation rules fail.</li>
<li>A validation error for each field will be automatically displayed in the view using the <code>errors</code> helper function.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="custom-error-messages">Custom Error Messages</h2>
<div class="sourceCode" id="cb3"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb3-1"><a href="#cb3-1"></a><span class="va">$request</span>->validate([</span>
<span id="cb3-2"><a href="#cb3-2"></a> <span class="st">'name'</span> => <span class="st">'required|string'</span><span class="ot">,</span></span>
<span id="cb3-3"><a href="#cb3-3"></a> <span class="st">'email'</span> => <span class="st">'required|email|unique:users'</span></span>
<span id="cb3-4"><a href="#cb3-4"></a>]<span class="ot">,</span> [</span>
<span id="cb3-5"><a href="#cb3-5"></a> <span class="st">'name.required'</span> => <span class="st">'Please enter your name.'</span><span class="ot">,</span></span>
<span id="cb3-6"><a href="#cb3-6"></a> <span class="st">'email.unique'</span> => <span class="st">'This email has already been registered.'</span></span>
<span id="cb3-7"><a href="#cb3-7"></a>])<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>Custom error messages can be defined for each validation rule.</li>
<li>The message for a specific rule can be defined using the <code>attribute.rule</code> syntax.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="conditional-validation">Conditional Validation</h2>
<div class="sourceCode" id="cb4"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb4-1"><a href="#cb4-1"></a><span class="va">$request</span>->validate([</span>
<span id="cb4-2"><a href="#cb4-2"></a> <span class="st">'name'</span> => <span class="st">'required_if:type,admin'</span><span class="ot">,</span></span>
<span id="cb4-3"><a href="#cb4-3"></a> <span class="st">'email'</span> => <span class="st">'required_unless:type,admin'</span><span class="ot">,</span></span>
<span id="cb4-4"><a href="#cb4-4"></a>])<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>Sometimes you may only want a field to be required if certain conditions are met.</li>
<li>Conditional validation can be achieved using the <code>required_if</code>, <code>required_unless</code>, and other validation rules.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="complex-validation">Complex Validation</h2>
<div class="sourceCode" id="cb5"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb5-1"><a href="#cb5-1"></a><span class="va">$request</span>->validate([</span>
<span id="cb5-2"><a href="#cb5-2"></a> <span class="st">'phone'</span> => [</span>
<span id="cb5-3"><a href="#cb5-3"></a> <span class="st">'required_without_all:email,address'</span><span class="ot">,</span></span>
<span id="cb5-4"><a href="#cb5-4"></a> <span class="st">'phone:AUTO,US'</span><span class="ot">,</span></span>
<span id="cb5-5"><a href="#cb5-5"></a> ]<span class="ot">,</span></span>
<span id="cb5-6"><a href="#cb5-6"></a>])<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>Complex validation rules can be created using the <code>array</code> syntax.</li>
<li>In this example, the field is required if <code>email</code> and <code>address</code> are not present, and must be a valid US phone number.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/validation#rule-arrays">https://laravel.com/docs/validation#rule-arrays</a></p>
</section>
<section class="slide level1">
<h2 id="custom-validation-rules">Custom Validation Rules</h2>
<div class="sourceCode" id="cb6"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb6-1"><a href="#cb6-1"></a><span class="cn">V</span>alidator::extend(<span class="st">'phone_number'</span><span class="ot">,</span> <span class="kw">function</span> (<span class="va">$attribute</span><span class="ot">,</span> <span class="va">$value</span><span class="ot">,</span> <span class="va">$parameters</span><span class="ot">,</span> <span class="va">$validator</span>) {</span>
<span id="cb6-2"><a href="#cb6-2"></a> <span class="cf">return</span> <span class="fu">preg_match</span>(<span class="st">'/^[0-9]{3}-[0-9]{3}-[0-9]{4}$/'</span><span class="ot">,</span> <span class="va">$value</span>)<span class="ot">;</span></span>
<span id="cb6-3"><a href="#cb6-3"></a>})<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>Custom validation rules can be defined using the <code>Validator::extend</code> method.</li>
<li>The method should return <code>true</code> if the validation passes, and <code>false</code> otherwise.</li>
<li>The new validation rule can then be used in any form validation.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/validation#custom-validation-rules">https://laravel.com/docs/validation#custom-validation-rules</a></p>
</section>
<section class="slide level1">
<h2 id="form-requests">Form Requests</h2>
<div class="sourceCode" id="cb7"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb7-1"><a href="#cb7-1"></a>php artisan make<span class="ot">:</span>request <span class="cn">S</span>toreBlogPost</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>Instead of validating form data within a controller method, it can be encapsulated within a “form request” class.</li>
<li>Form requests can be generated using the <code>php artisan make:request</code> command.</li>
<li>These classes validate the incoming request and store the validated data on a <code>$validated</code> property.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/validation#form-request-validation">https://laravel.com/docs/validation#form-request-validation</a></p>
</section>
<section class="slide level1">
<h2 id="repopulating-form-data">Repopulating Form Data</h2>
<div class="sourceCode" id="cb8"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb8-1"><a href="#cb8-1"></a><span class="op"><</span>input type<span class="op">=</span><span class="st">"text"</span> id<span class="op">=</span><span class="st">"name"</span> name<span class="op">=</span><span class="st">"name"</span> value<span class="op">=</span><span class="st">"{{ old('name') }}"</span><span class="op">></span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>When a form is submitted and validation fails, the user is redirected back to the form page with the submitted data.</li>
<li>The <code>old</code> function can be used to retrieve the value of a previously submitted field.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/requests#old-input">https://laravel.com/docs/requests#old-input</a></p>
</section>
<section class="slide level1">
<h2 id="creating-custom-error-views">Creating Custom Error Views</h2>
<div class="sourceCode" id="cb9"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb9-1"><a href="#cb9-1"></a><span class="pp">@</span><span class="cf">if</span> (<span class="va">$errors</span>->any())</span>
<span id="cb9-2"><a href="#cb9-2"></a> <span class="op"><</span>div <span class="kw">class</span><span class="op">=</span><span class="st">"alert alert-danger"</span><span class="op">></span></span>
<span id="cb9-3"><a href="#cb9-3"></a> <span class="op"><</span>ul<span class="op">></span></span>
<span id="cb9-4"><a href="#cb9-4"></a> <span class="pp">@</span><span class="cf">foreach</span> (<span class="va">$errors</span>->all() <span class="kw">as</span> <span class="va">$error</span>)</span>
<span id="cb9-5"><a href="#cb9-5"></a> <span class="op"><</span>li<span class="op">></span>{{ <span class="va">$error</span> }}<span class="op"></</span>li<span class="op">></span></span>
<span id="cb9-6"><a href="#cb9-6"></a> <span class="pp">@</span><span class="cf">endforeach</span></span>
<span id="cb9-7"><a href="#cb9-7"></a> <span class="op"></</span>ul<span class="op">></span></span>
<span id="cb9-8"><a href="#cb9-8"></a> <span class="op"></</span>div<span class="op">></span></span>
<span id="cb9-9"><a href="#cb9-9"></a><span class="pp">@</span><span class="cf">endif</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>A custom error view can be created to display validation errors.</li>
<li>The <code>$errors</code> variable is automatically created by Laravel and contains all validation errors for the current request.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/validation#working-with-error-messages">https://laravel.com/docs/validation#working-with-error-messages</a></p>
</section>
<section class="slide level1">
<h2 id="customizing-error-messages">Customizing Error Messages</h2>
<div class="sourceCode" id="cb10"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb10-1"><a href="#cb10-1"></a><span class="cn">V</span>alidator::replacer(<span class="st">'required_if'</span><span class="ot">,</span> <span class="kw">function</span> (<span class="va">$message</span><span class="ot">,</span> <span class="va">$attribute</span><span class="ot">,</span> <span class="va">$rule</span><span class="ot">,</span> <span class="va">$parameters</span>) {</span>
<span id="cb10-2"><a href="#cb10-2"></a> <span class="cf">return</span> <span class="fu">str_replace</span>(<span class="st">':other'</span><span class="ot">,</span> <span class="va">$parameters</span>[<span class="dv">0</span>]<span class="ot">,</span> <span class="va">$message</span>)<span class="ot">;</span></span>
<span id="cb10-3"><a href="#cb10-3"></a>})<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>Customized validation error messages can be defined using the <code>Validator::replacer</code> method.</li>
<li>This allows for more fine-grained control over the error messages displayed to the user.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/validation#custom-error-messages">https://laravel.com/docs/validation#custom-error-messages</a></p>
</section>
<section class="slide level1">
<h2 id="retaining-old-input-after-failed-validation">Retaining Old Input after Failed Validation</h2>
<div class="sourceCode" id="cb11"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb11-1"><a href="#cb11-1"></a><span class="cf">return</span> redirect(<span class="st">'form'</span>)->withInput()<span class="ot">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>After a form has failed validation, it can be helpful to retain the previously submitted data.</li>
<li>The <code>withInput</code> method can be called on the redirect instance to flash the old input values to the session.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/redirects#redirecting-with-flashed-session-data%5D">https://laravel.com/docs/redirects#redirecting-with-flashed-session-data</a></p>
</section>
<section class="slide level1">
<h2 id="testing-form-validation">Testing Form Validation</h2>
<div class="sourceCode" id="cb12"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb12-1"><a href="#cb12-1"></a><span class="kw">public</span> <span class="kw">function</span> testFormValidation()</span>
<span id="cb12-2"><a href="#cb12-2"></a>{</span>
<span id="cb12-3"><a href="#cb12-3"></a> <span class="va">$response</span> <span class="op">=</span> <span class="va">$this</span>->post(<span class="st">'/your-route'</span><span class="ot">,</span> [</span>
<span id="cb12-4"><a href="#cb12-4"></a> <span class="st">'name'</span> => <span class="st">''</span><span class="ot">,</span></span>
<span id="cb12-5"><a href="#cb12-5"></a> <span class="st">'email'</span> => <span class="st">'not_an_email'</span><span class="ot">,</span></span>
<span id="cb12-6"><a href="#cb12-6"></a> ])<span class="ot">;</span></span>
<span id="cb12-7"><a href="#cb12-7"></a></span>
<span id="cb12-8"><a href="#cb12-8"></a> <span class="va">$response</span>->assertSessionHasErrors([<span class="st">'name'</span><span class="ot">,</span> <span class="st">'email'</span>])<span class="ot">;</span></span>
<span id="cb12-9"><a href="#cb12-9"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<ul>
<li>Unit tests can be written to verify that form validation has been implemented correctly.</li>
<li>Laravel provides a simple and intuitive way to test form validation.</li>
</ul>
<p>Documentation: <a href="https://laravel.com/docs/testing#form-validation">https://laravel.com/docs/testing#form-validation</a></p>
</section>
<section class="slide level1">
<h2 id="conclusion">Conclusion</h2>
<ul>
<li>Laravel provides a convenient and powerful way to create HTML forms and validate incoming data.</li>
<li>The built-in form and validation features make it easy to create secure and user-friendly applications.</li>
<li>Take advantage of these features for your next Laravel project!</li>
</ul>
</section>
<section class="slide level1">
<h3 id="references">References</h3>
<ul>
<li>Laravel Forms Documentation: <a href="https://laravel.com/docs/forms">https://laravel.com/docs/forms</a></li>
<li>Laravel Validation Documentation: <a href="https://laravel.com/docs/validation">https://laravel.com/docs/validation</a></li>
<li>Laravel Requests Documentation: <a href="https://laravel.com/docs/requests">https://laravel.com/docs/requests</a></li>
<li>Laravel Redirects Documentation: <a href="https://laravel.com/docs/redirects">https://laravel.com/docs/redirects</a></li>
<li>Laravel Testing Documentation: <a href="https://laravel.com/docs/testing">https://laravel.com/docs/testing</a></li>
</ul>
<img src="https://upload.wikimedia.org/wikipedia/commons/e/e2/SAE_Institute_Black_Logo.jpg" class="slide-logo r-stretch"><div class="footer footer-default">
<p>Vladimir Lelicanin - SAE Institute Belgrade</p>
</div>
</section>
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if (!isInternal(link.href)) {
// target, if specified
link.setAttribute("target", "_blank");
}
}
});
</script>
</body></html>