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- ããã©ãŒãã³ã¹ã®åäžïŒ JavaScriptãæé€ããããšã§ãããŒãžã®èªã¿èŸŒã¿æéãççž®ãããå šäœçãªããã©ãŒãã³ã¹ãåäžããŸãã
- ã¢ã¯ã»ã·ããªãã£ã®åäžïŒ é©åãªHTMLã»ãã³ãã£ã¯ã¹ãšARIA屿§ãå©çšããããšã§ãCSSã®ã¿ã®ã¢ã³ãŒãã£ãªã³ã容æã«ã¢ã¯ã»ã·ãã«ã«ã§ããŸãã
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<input type="radio">
: ã©ãžãªãã¿ã³ã¯ãäžåºŠã«äžã€ã®ã»ã¯ã·ã§ã³ããéããªãããã«ããããã«äœ¿çšãããŸãã`name`屿§ã¯ãã©ãžãªãã¿ã³ãã°ã«ãŒãåããããã«éåžžã«éèŠã§ãã<label>
: ã©ãã«ã¯ã©ãžãªãã¿ã³ã«é¢é£ä»ããããã¢ã³ãŒãã£ãªã³ã®ããããŒãšããŠæ©èœããŸãã<div>
: ã¢ã³ãŒãã£ãªã³ã®ã³ã³ãã³ããä¿æããããã®ã³ã³ããã§ãã
åºæ¬çãªHTMLæ§é ã¯ä»¥äžã®éãã§ãã
<div class="accordion-container">
<input type="radio" name="accordion" id="section1">
<label for="section1">ã»ã¯ã·ã§ã³1ã®ã¿ã€ãã«</label>
<div class="accordion-content">
<p>ã»ã¯ã·ã§ã³1ã®ã³ã³ãã³ãã</p>
</div>
<input type="radio" name="accordion" id="section2">
<label for="section2">ã»ã¯ã·ã§ã³2ã®ã¿ã€ãã«</label>
<div class="accordion-content">
<p>ã»ã¯ã·ã§ã³2ã®ã³ã³ãã³ãã</p>
</div>
<input type="radio" name="accordion" id="section3">
<label for="section3">ã»ã¯ã·ã§ã³3ã®ã¿ã€ãã«</label>
<div class="accordion-content">
<p>ã»ã¯ã·ã§ã³3ã®ã³ã³ãã³ãã</p>
</div>
</div>
解説ïŒ
- `accordion-container`ã¯ã©ã¹ã¯ãã¢ã³ãŒãã£ãªã³å šäœã®æ§é ãã¹ã¿ã€ãªã³ã°ããããã«äœ¿çšãããŸãã
- åã¢ã³ãŒãã£ãªã³ã»ã¯ã·ã§ã³ã¯ã`input`ïŒã©ãžãªãã¿ã³ïŒã`label`ãããã³ã³ã³ãã³ããå«ã`div`ã§æ§æãããŸãã
- ã©ãžãªãã¿ã³ã®`name`屿§ã¯ãaccordionãã«èšå®ãããããããã°ã«ãŒãåããäžåºŠã«äžã€ããéžæã§ããªãããã«ããŸãã
- `label`ã®`for`屿§ã¯ã察å¿ãã`input`ã®`id`ãšäžèŽãããã©ãã«ãã©ãžãªãã¿ã³ã«ãªã³ã¯ãããŸãã
CSSã«ããã¢ã³ãŒãã£ãªã³ã®ã¹ã¿ã€ãªã³ã°
次ã«ãã¢ã³ãŒãã£ãªã³ãã¹ã¿ã€ãªã³ã°ããåäžééã®åäœãå®è£ ããããã®CSSã远å ããŸãããã
.accordion-container {
width: 100%;
border: 1px solid #ccc;
margin-bottom: 10px;
}
input[type="radio"] {
display: none;
}
label {
display: block;
padding: 10px;
background-color: #f0f0f0;
border-bottom: 1px solid #ccc;
cursor: pointer;
}
.accordion-content {
padding: 10px;
background-color: #fff;
display: none; /* åæç¶æ
ã§ã¯ã³ã³ãã³ããé衚瀺ã«ãã */
}
input[type="radio"]:checked + label {
background-color: #ddd;
}
input[type="radio"]:checked + label + .accordion-content {
display: block; /* ã©ãžãªãã¿ã³ããã§ãã¯ããããšãã«ã³ã³ãã³ãã衚瀺ãã */
}
解説ïŒ
.accordion-container
: ã³ã³ããã«æ ç·ãšããŒãžã³ãèšå®ããŠã¹ã¿ã€ãªã³ã°ããŸããinput[type="radio"]
: ã©ãã«ã®ã¿ã衚瀺ããããããã©ãžãªãã¿ã³èªäœã¯é衚瀺ã«ããŸããlabel
: ã©ãã«ãã¢ã³ãŒãã£ãªã³ã®ããããŒã®ããã«ã¹ã¿ã€ãªã³ã°ããŸãã.accordion-content
: `display: none`ã䜿çšããŠãåæç¶æ ã§ã¯ã³ã³ãã³ããé衚瀺ã«ããŸããinput[type="radio"]:checked + label
: 察å¿ããã©ãžãªãã¿ã³ããã§ãã¯ããããšãã®ã©ãã«ãã¹ã¿ã€ãªã³ã°ããŸããinput[type="radio"]:checked + label + .accordion-content
: ãããåäžééåäœã®éµã§ãã飿¥å åŒã»ã¬ã¯ã¿ïŒ+ïŒã䜿çšããŠããã§ãã¯ãããã©ãžãªãã¿ã³ã®`label`ã®çŽåŸã«ãã`accordion-content`ãã¿ãŒã²ããã«ãããã®`display`ã`block`ã«èšå®ããŠè¡šç€ºãããŸãã
ARIA屿§ã«ããã¢ã¯ã»ã·ããªãã£ã®åäž
ã¢ã³ãŒãã£ãªã³ãé害ãæã€ãŠãŒã¶ãŒã«ãã¢ã¯ã»ã¹å¯èœã§ããããšãä¿èšŒããããã«ãARIA屿§ã远å ããå¿ èŠããããŸããARIAïŒAccessible Rich Internet ApplicationsïŒå±æ§ã¯ãã¹ã¯ãªãŒã³ãªãŒããŒãªã©ã®æ¯æŽæè¡ã«æå³çãªæ å ±ãæäŸããŸãã
ã¢ã¯ã»ã·ããªãã£ãåäžãããæ¹æ³ã¯ä»¥äžã®éãã§ãã
<div class="accordion-container" role="presentation">
<input type="radio" name="accordion" id="section1" aria-controls="content1">
<label for="section1" aria-expanded="false" aria-controls="content1">ã»ã¯ã·ã§ã³1ã®ã¿ã€ãã«</label>
<div id="content1" class="accordion-content" role="region" aria-labelledby="section1">
<p>ã»ã¯ã·ã§ã³1ã®ã³ã³ãã³ãã</p>
</div>
<input type="radio" name="accordion" id="section2" aria-controls="content2">
<label for="section2" aria-expanded="false" aria-controls="content2">ã»ã¯ã·ã§ã³2ã®ã¿ã€ãã«</label>
<div id="content2" class="accordion-content" role="region" aria-labelledby="section2">
<p>ã»ã¯ã·ã§ã³2ã®ã³ã³ãã³ãã</p>
</div>
<input type="radio" name="accordion" id="section3" aria-controls="content3">
<label for="section3" aria-expanded="false" aria-controls="content3">ã»ã¯ã·ã§ã³3ã®ã¿ã€ãã«</label>
<div id="content3" class="accordion-content" role="region" aria-labelledby="section3">
<p>ã»ã¯ã·ã§ã³3ã®ã³ã³ãã³ãã</p>
</div>
</div>
解説ïŒ
- ã³ã³ããã®`role="presentation"`ã¯ãã³ã³ããã®ã»ãã³ãã£ãã¯ãªæå³ãé ãããã¹ããããARIAããŒã«ãæ§é ãé©åã«äŒéã§ããããã«ããŸãã
aria-controls
: çŸåšã®èŠçŽ ã«ãã£ãŠå¶åŸ¡ãããèŠçŽ ïŒãã®å Žåã¯ã³ã³ãã³ãã»ã¯ã·ã§ã³ïŒã瀺ããŸããaria-expanded
: å¶åŸ¡ãããèŠçŽ ãçŸåšå±éãããŠãããæããããŸããŠãããã瀺ããŸããJavaScriptã§åçã«å€æŽããããã§ã¯ãããŸããããå«ããŠããã®ãè¯ãç¿æ £ã§ããããè€éãªäŸã§ã¯JavaScriptã§å€ãåãæ¿ããããšãã§ããŸããåæå€ã¯`false`ã«èšå®ãããŠããŸããrole="region"
: ã³ã³ãã³ãã»ã¯ã·ã§ã³ãããŒãžäžã®æç¢ºãªé åãšããŠèå¥ããŸããaria-labelledby
: ã³ã³ãã³ãã»ã¯ã·ã§ã³ã説æããã©ãã«ãèå¥ããŸãã
ã¢ã¯ã»ã·ããªãã£ã«é¢ããéèŠãªèæ ®äºé ïŒ
- ããŒããŒãããã²ãŒã·ã§ã³ïŒ ãŠãŒã¶ãŒãããŒããŒãïŒäŸïŒTabããŒïŒã䜿çšããŠã¢ã³ãŒãã£ãªã³ã»ã¯ã·ã§ã³éãç§»åã§ããããšã確èªããŠãã ããã
- ã¹ã¯ãªãŒã³ãªãŒããŒã®äºææ§ïŒ ã¹ã¯ãªãŒã³ãªãŒããŒã§ã¢ã³ãŒãã£ãªã³ããã¹ãããã³ã³ãã³ããé©åã«èªã¿äžããããããšã確èªããŠãã ããã
- è²ã®ã³ã³ãã©ã¹ãïŒ èŠèŠé害ã®ãããŠãŒã¶ãŒã®ããã«ãããã¹ããšèæ¯ã®éã«ååãªè²ã®ã³ã³ãã©ã¹ãã確ä¿ããŠãã ããã
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.accordion-content {
padding: 10px;
background-color: #fff;
display: none;
transition: max-height 0.3s ease-out; /* ãã©ã³ãžã·ã§ã³ã远å */
max-height: 0;
overflow: hidden;
}
input[type="radio"]:checked + label + .accordion-content {
display: block;
max-height: 500px; /* ãã©ã³ãžã·ã§ã³ã®ããã«æå€§é«ããèšå® */
}
解説ïŒ
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- åæã®`max-height`ã`0`ã«èšå®ããŠã³ã³ãã³ããé衚瀺ã«ããŸãã
- ã©ãžãªãã¿ã³ããã§ãã¯ããããšã`max-height`ãååã«å€§ããªå€ïŒäŸïŒ`500px`ïŒã«èšå®ããã³ã³ãã³ããã¹ã ãŒãºã«å±éã§ããããã«ããŸãã`overflow: hidden`ã¯ãå®éã®ã³ã³ãã³ãã®é«ãã500pxæªæºã®å Žåã«ããã©ã³ãžã·ã§ã³äžã«ã³ã³ãã³ããã¯ã¿åºãã®ãé²ããŸãã
ã¢ã€ã³ã³ã«ããã¹ã¿ã€ãªã³ã°
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CSSç䌌èŠçŽ ã®äœ¿çšïŒ
label::after {
content: '+'; /* åæã®ã¢ã€ã³ã³ */
float: right;
font-size: 1.2em;
}
input[type="radio"]:checked + label::after {
content: '-'; /* å±éæã«ã¢ã€ã³ã³ãå€æŽ */
}
ãã©ã³ãã¢ã€ã³ã³ã®äœ¿çšïŒäŸïŒFont AwesomeïŒïŒ
- HTMLã«Font Awesomeã®CSSãã€ã³ã¯ã«ãŒãããŸãïŒ
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css" integrity="..." crossorigin="anonymous" />
- ã©ãã«ã«é©åãªFont Awesomeã¯ã©ã¹ã䜿çšããŸãïŒ
<label for="section1">ã»ã¯ã·ã§ã³1ã®ã¿ã€ãã« <i class="fas fa-plus"></i></label>
次ã«ãã»ã¯ã·ã§ã³ãå±éããããšãã«ã¢ã€ã³ã³ã倿Žããããã«CSSã䜿çšããŸãïŒ
input[type="radio"]:checked + label i.fas.fa-plus {
display: none;
}
input[type="radio"]:checked + label {
/* ãã€ãã¹ã¢ã€ã³ã³ãæ¿å
¥ */
}
input[type="radio"]:checked + label::before {
font-family: "Font Awesome 5 Free";
font-weight: 900;
content: "\f068"; /* fa-minusã®ãŠãã³ãŒã */
float:right;
}
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width: 100%; /* å°ããç»é¢çšã«å¹
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}
label {
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font-size: 0.9em; /* ãã©ã³ããµã€ãºãèª¿æŽ */
}
}
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- MDN Web Docs: https://developer.mozilla.org/ja/docs/Web/CSS
- ARIA Authoring Practices Guide (APG): https://www.w3.org/WAI/ARIA/apg/
- WebAIM: https://webaim.org/