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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Show If Web Component Demo</title>
<link rel="stylesheet" href="./styles.css" />
<style>
/* Demo-specific styles */
.disabled label {
outline: 3px solid red;
outline-offset: 7px;
background: #f7d3d3;
}
.enabled label {
outline: 3px solid green;
outline-offset: 7px;
background: #d3f7d3;
}
form-show-if:defined label.dependent {
display: none;
}
form-show-if:defined label.dependent:not([hidden]) {
display: block;
}
</style>
</head>
<body>
<header>
<h1>Show If Web Component Demo</h1>
<p>
A web component that conditionally shows or hides form fields
based on the values of other fields. See the
<a
href="../"
>README</a
>
for installation and API documentation.
</p>
<p>
<strong>Visual indicators:</strong> In these demos, fields with
custom CSS classes show green outlines/backgrounds when visible
and red when hidden.
</p>
</header>
<main>
<!-- Basic Conditional Show/Hide -->
<section>
<h2>Basic Conditional Show/Hide</h2>
<p>
Simple conditions that show a field when another field has
any value.
</p>
<div class="demo-section">
<h3>Show Field if Another Field Has Any Value</h3>
<p>
Using <code>conditions="email=*"</code> shows the field
when the email field contains any value.
</p>
<div class="code-demo-pair">
<pre><code><label>Email address
<input type="email" name="email" />
</label>
<mark><form-show-if
conditions="email=*"></mark>
<label for="phone">Phone number
<input
name="phone"
id="phone"
type="tel" />
</label>
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Email address
<input type="email" name="email" />
</label>
<form-show-if conditions="email=*">
<label for="phone"
>Phone number
<input
name="phone"
id="phone"
type="tel"
/>
<small
>This field appears when the email
field is filled out</small
>
</label>
</form-show-if>
</form>
</div>
</div>
</div>
</section>
<!-- OR Logic -->
<section>
<h2>OR Logic</h2>
<p>
Show a field when <em>any</em> of multiple conditions are
met using the <code>||</code>
operator.
</p>
<div class="demo-section">
<h3>Multiple Conditions (OR)</h3>
<p>
Using <code>conditions="email=*||choose=3"</code> shows
the field when either the email field has a value OR the
select has "Option 3" chosen.
</p>
<div class="code-demo-pair">
<pre><code><label>Email address
<input type="email" name="email" />
</label>
<label for="choose">Choose an option
<select name="choose" id="choose">
<option value="">Select...</option>
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
</label>
<mark><form-show-if
conditions="email=*||choose=3"></mark>
<label for="details">Details
<input name="details" id="details" />
</label>
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Email address
<input type="email" name="email2" />
</label>
<label for="choose"
>Choose an option
<select name="choose" id="choose">
<option value="">Select...</option>
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
</label>
<form-show-if conditions="email2=*||choose=3">
<label for="details"
>Details
<input name="details" id="details" />
<small
>Shown if email has a value OR
Option 3 is selected</small
>
</label>
</form-show-if>
</form>
</div>
</div>
</div>
</section>
<!-- Specific Value Matching -->
<section>
<h2>Specific Value Matching</h2>
<p>
Show a field only when another field matches an exact value.
</p>
<div class="demo-section">
<h3>Exact Value Match</h3>
<p>
Using <code>conditions="email=foo@bar.tld"</code> shows
the field only when the email field contains that exact
value.
</p>
<div class="code-demo-pair">
<pre><code><label>Email address
<input type="email" name="email" />
</label>
<mark><form-show-if
conditions="email=foo@bar.tld"></mark>
<label for="secret">Secret code
<input name="secret" id="secret" />
</label>
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Email address
<input type="email" name="email3" />
</label>
<form-show-if conditions="email3=foo@bar.tld">
<label for="secret"
>Secret code
<input name="secret" id="secret" />
<small
>Try entering "foo@bar.tld" as the
email address</small
>
</label>
</form-show-if>
</form>
</div>
</div>
</div>
</section>
<!-- Radio & Checkbox Integration -->
<section>
<h2>Radio & Checkbox Integration</h2>
<p>
Common pattern for "Other" options in radio and checkbox
groups.
</p>
<div class="demo-section">
<h3>Radio "Other" Pattern</h3>
<p>
When a user selects "Other", a text field appears for
them to specify.
</p>
<div class="code-demo-pair">
<pre><code><fieldset>
<legend>Choose an option</legend>
<label>
<input type="radio"
name="radio" value="1" />
Option 1
</label>
<label>
<input type="radio"
name="radio" value="2" />
Option 2
</label>
<div class="other-radio">
<label>
<input type="radio"
name="radio" value="other" />
Other
</label>
<mark><form-show-if
conditions="radio=other"></mark>
<label class="dependent">
<span class="visibly-hidden">Other value</span>
<input name="radio-other" />
</label>
<mark></form-show-if></mark>
</div>
</fieldset></code></pre>
<div class="demo">
<form action="#">
<fieldset>
<legend>Choose an option</legend>
<label
><input
type="radio"
name="radio"
value="1"
/>
Option 1</label
>
<label
><input
type="radio"
name="radio"
value="2"
/>
Option 2</label
>
<div class="other-radio">
<label
><input
type="radio"
name="radio"
value="other"
/>
Other</label
>
<form-show-if conditions="radio=other">
<label class="dependent"
><span class="visibly-hidden"
>Other value</span
>
<input name="radio-other" />
</label>
</form-show-if>
</div>
</fieldset>
</form>
</div>
</div>
</div>
<div class="demo-section">
<h3>Checkbox "Other" Pattern</h3>
<p>
Similar to radio, but works with checkbox arrays using
<code>checkbox[]=other</code> syntax.
</p>
<div class="code-demo-pair">
<pre><code><fieldset>
<legend>Choose options</legend>
<label>
<input type="checkbox"
name="checkbox[]" value="1" />
Option 1
</label>
<label>
<input type="checkbox"
name="checkbox[]" value="2" />
Option 2
</label>
<div class="other-checkbox">
<label>
<input type="checkbox"
name="checkbox[]"
value="other" />
Other
</label>
<mark><form-show-if
conditions="checkbox[]=other"></mark>
<label class="dependent">
<span class="visibly-hidden">Other value</span>
<input name="checkbox-other" />
</label>
<mark></form-show-if></mark>
</div>
</fieldset></code></pre>
<div class="demo">
<form action="#">
<fieldset>
<legend>Choose options</legend>
<label
><input
type="checkbox"
name="checkbox[]"
value="1"
/>
Option 1</label
>
<label
><input
type="checkbox"
name="checkbox[]"
value="2"
/>
Option 2</label
>
<div class="other-checkbox">
<label
><input
type="checkbox"
name="checkbox[]"
value="other"
/>
Other</label
>
<form-show-if
conditions="checkbox[]=other"
>
<label class="dependent"
><span class="visibly-hidden"
>Other value</span
>
<input name="checkbox-other" />
</label>
</form-show-if>
</div>
</fieldset>
</form>
</div>
</div>
</div>
</section>
<!-- Custom CSS Classes -->
<section>
<h2>Custom CSS Classes</h2>
<p>
Customize the appearance of shown and hidden fields using
CSS classes instead of the <code>hidden</code> attribute.
</p>
<div class="demo-section">
<h3>Enabled Class</h3>
<p>
The <code>enabled-class</code> attribute adds a CSS
class when the field should be visible, like
<code>enabled-class="enabled"</code>.
</p>
<div class="code-demo-pair">
<pre><code><mark><form-show-if
conditions="email=*"
enabled-class="enabled"></mark>
<label for="company">Company
<input name="company" id="company" />
</label>
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Email address
<input type="email" name="email4" />
</label>
<form-show-if
conditions="email4=*"
enabled-class="enabled"
>
<label for="company"
>Company
<input name="company" id="company" />
<small
>Gets a green outline when
shown</small
>
</label>
</form-show-if>
</form>
</div>
</div>
</div>
<div class="demo-section">
<h3>Disabled Class</h3>
<p>
The <code>disabled-class</code> attribute adds a CSS
class when the field should be hidden, like
<code>disabled-class="disabled"</code>.
</p>
<div class="code-demo-pair">
<pre><code><mark><form-show-if
conditions="email=*"
disabled-class="disabled"></mark>
<label for="department">Department
<input
name="department"
id="department" />
</label>
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Email address
<input type="email" name="email5" />
</label>
<form-show-if
conditions="email5=*"
disabled-class="disabled"
>
<label for="department"
>Department
<input
name="department"
id="department"
/>
<small
>Gets a red outline when
hidden</small
>
</label>
</form-show-if>
</form>
</div>
</div>
</div>
<div class="demo-section">
<h3>Both Classes</h3>
<p>
Combine both classes for complete visual control over
shown and hidden states.
</p>
<div class="code-demo-pair">
<pre><code><mark><form-show-if
conditions="email=*"
enabled-class="enabled"
disabled-class="disabled"></mark>
<label for="notes">Notes
<textarea
name="notes"
id="notes"></textarea>
</label>
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Email address
<input type="email" name="email6" />
</label>
<form-show-if
conditions="email6=*"
enabled-class="enabled"
disabled-class="disabled"
>
<label for="notes"
>Notes
<textarea
name="notes"
id="notes"
rows="3"
></textarea>
<small
>Green when shown, red when
hidden</small
>
</label>
</form-show-if>
</form>
</div>
</div>
</div>
</section>
<!-- Label Structure Variations -->
<section>
<h2>Label Structure Variations</h2>
<p>
The component works with different <code>label</code> /
<code>input</code> markup patterns.
</p>
<div class="demo-section">
<h3>Sibling Label & Input</h3>
<p>
<code>label</code> and <code>input</code> as siblings
instead of the <code>input</code> being nested in the
<code>label</code>.
</p>
<div class="code-demo-pair">
<pre><code><mark><form-show-if
conditions="email=*"></mark>
<label for="field1">
Field label
</label>
<input
type="text"
id="field1"
name="field1" />
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Email address
<input type="email" name="email7" />
</label>
<form-show-if conditions="email7=*">
<label for="field1">Field label</label>
<input
type="text"
id="field1"
name="field1"
/>
</form-show-if>
</form>
</div>
</div>
</div>
<div class="demo-section">
<h3>Label with Nested Elements</h3>
<p>
Works with labels containing one or more nested
elements.
</p>
<div class="code-demo-pair">
<pre><code><mark><form-show-if
conditions="email=*"></mark>
<label for="field2">
<span>Multi-part</span>
<span>label text</span>
</label>
<input id="field2" name="field2" />
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Email address
<input type="email" name="email8" />
</label>
<form-show-if conditions="email8=*">
<label for="field2"
><span>Multi-part</span>
<span>label text</span></label
>
<input id="field2" name="field2" />
</form-show-if>
</form>
</div>
</div>
</div>
<div class="demo-section">
<h3>Label Wrapping Input</h3>
<p>Label can wrap the <code>input</code> element.</p>
<div class="code-demo-pair">
<pre><code><mark><form-show-if
conditions="email=*"></mark>
<label>
<span>Wrapped input</span>
<input name="field3" />
</label>
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Email address
<input type="email" name="email9" />
</label>
<form-show-if conditions="email9=*">
<label
><span>Wrapped input</span>
<input name="field3" />
</label>
</form-show-if>
</form>
</div>
</div>
</div>
</section>
<!-- Complex Examples -->
<section>
<h2>Complex Examples</h2>
<p>More advanced use cases combining multiple techniques.</p>
<div class="demo-section">
<h3>Chained Dependencies</h3>
<p>Field A shows Field B, and Field B shows Field C.</p>
<div class="code-demo-pair">
<pre><code><label>Enable feature
<input
type="checkbox"
name="enable"
value="yes" />
</label>
<mark><form-show-if
conditions="enable=yes"></mark>
<label for="feature-type">
Feature type
<select
name="feature-type"
id="feature-type">
<option value="">Select...</option>
<option value="basic">Basic</option>
<option value="advanced">
Advanced
</option>
</select>
</label>
<mark></form-show-if></mark>
<mark><form-show-if
conditions="feature-type=advanced"></mark>
<label for="config">
Advanced config
<textarea
name="config"
id="config"></textarea>
</label>
<mark></form-show-if></mark></code></pre>
<div class="demo">
<form action="#">
<label
>Enable feature
<input
type="checkbox"
name="enable"
value="yes"
/>
</label>
<form-show-if conditions="enable=yes">
<label for="feature-type"
>Feature type
<select
name="feature-type"
id="feature-type"
>
<option value="">Select...</option>
<option value="basic">Basic</option>
<option value="advanced">
Advanced
</option>
</select>
<small
>Shown when feature is
enabled</small
>
</label>
</form-show-if>
<form-show-if
conditions="feature-type=advanced"
>
<label for="config"
>Advanced configuration
<textarea
name="config"
id="config"
rows="3"
></textarea>
<small
>Shown when "Advanced" is
selected</small
>
</label>
</form-show-if>
</form>
</div>
</div>
</div>
</section>
<!-- Real-World Example -->
<section>
<h2>Real-World Example</h2>
<p>A complete contact form demonstrating practical usage.</p>
<div class="demo-section">
<h3>Contact Form with Conditional Fields</h3>
<p>
This form collects contact preferences and conditionally
shows contact detail fields.
</p>
<div class="code-demo-pair">
<pre><code><form action="#">
<label>Name
<input type="text"
name="name" required />
</label>
<fieldset>
<legend>
How should we contact you?
</legend>
<label>
<input type="checkbox"
name="contact[]"
value="email" />
Email
</label>
<label>
<input type="checkbox"
name="contact[]"
value="phone" />
Phone
</label>
</fieldset>
<mark><form-show-if
conditions="contact[]=email"></mark>
<label for="contact-email">
Email address
<input type="email"
name="contact-email"
id="contact-email" />
</label>
<mark></form-show-if></mark>
<mark><form-show-if
conditions="contact[]=phone"></mark>
<label for="contact-phone">
Phone number
<input type="tel"
name="contact-phone"
id="contact-phone" />
</label>
<mark></form-show-if></mark>
<label for="message">Message
<textarea name="message"
id="message"
required></textarea>
</label>
<button type="submit">
Send
</button>
</form></code></pre>
<div class="demo">
<form action="#">
<label
>Name
<input type="text" name="name" required />
</label>
<fieldset>
<legend>How should we contact you?</legend>
<label
><input
type="checkbox"
name="contact[]"
value="email"
/>
Email</label
>
<label
><input
type="checkbox"
name="contact[]"
value="phone"
/>
Phone</label
>
</fieldset>
<form-show-if conditions="contact[]=email">
<label for="contact-email"
>Email address
<input
type="email"
name="contact-email"
id="contact-email"
/>
</label>
</form-show-if>
<form-show-if conditions="contact[]=phone">
<label for="contact-phone"
>Phone number
<input
type="tel"
name="contact-phone"
id="contact-phone"
/>
</label>
</form-show-if>
<label for="message"
>Message
<textarea
name="message"
id="message"
required
rows="4"
></textarea>
</label>
<button type="submit">Send</button>
</form>
</div>
</div>
</div>
</section>
<!-- API Reference -->
<section class="api-reference">
<h2>API Reference</h2>
<p>
For complete documentation of attributes, behavior, and
browser support, see the
<a
href="../"
>README</a
>.
</p>
</section>
</main>
<footer>
<p>
Made with ❤️ by
<a href="https://github.com/aarongustafson">Aaron Gustafson</a>.
View the source on
<a href="https://github.com/aarongustafson/form-show-if"
>GitHub</a
>.
</p>
</footer>
<script src="../define.js" type="module"></script>
</body>
</html>