CSSã®ã¿ã§æä»çã¢ã³ãŒãã£ãªã³ãäœæããæ¹æ³ãåŠã³ãåžžã«1ã€ã®ã»ã¯ã·ã§ã³ã®ã¿ãéãããã«ããŸãããã®å æ¬çãªã¬ã€ãã§ããŠãŒã¶ãŒäœéšãåäžããããŠã§ããµã€ãã®ããã²ãŒã·ã§ã³ãæ¹åããŸãããã
CSSæä»çã¢ã³ãŒãã£ãªã³ïŒåäžééã³ã³ãããŒã«ã¬ã€ã
ã¢ã³ãŒãã£ãªã³ã¯ãã³ã³ãã³ããæ®µéçã«é瀺ããããã«äœ¿çšãããäžè¬çãªUIãã¿ãŒã³ã§ããç¹ã«ã¢ãã€ã«ããã€ã¹ã«ãããŠãæ å ±ãã³ã³ãã¯ãã«æŽçããŠè¡šç€ºãããŠãŒã¶ãŒäœéšãåäžãããããšãã§ããŸãããã®ã¬ã€ãã§ã¯ãCSSã®ã¿ã§æä»çã¢ã³ãŒãã£ãªã³ïŒåäžééã¢ã³ãŒãã£ãªã³ãšãåŒã°ããŸãïŒãäœæããæ¹æ³ãæ¢ããŸãããã®ã¿ã€ãã®ã¢ã³ãŒãã£ãªã³ã¯ãåžžã«1ã€ã®ã»ã¯ã·ã§ã³ã®ã¿ãéãããã«ããããšã§ããŠãŒã¶ãŒã«ã¯ãªãŒã³ã§éäžãããããã©ãŠãžã³ã°äœéšãæäŸããŸãã
æä»çã¢ã³ãŒãã£ãªã³ã䜿çšããçç±
æšæºçãªã¢ã³ãŒãã£ãªã³ã§ã¯è€æ°ã®ã»ã¯ã·ã§ã³ãåæã«éãããšãã§ããŸãããæä»çã¢ã³ãŒãã£ãªã³ã«ã¯ããã€ãã®å©ç¹ããããŸãïŒ
- ãã©ãŒã«ã¹ã®åäžïŒãŠãŒã¶ãŒãéããã»ã¯ã·ã§ã³ã1ã€ã«éå®ããããšã§ã泚æãåããããèªç¥çè² è·ã軜æžããŸãã
- ããã²ãŒã·ã§ã³ã®åŒ·åïŒæä»çã¢ã³ãŒãã£ãªã³ã¯ãç¹ã«è€éãªã³ã³ãã³ãæ§é å ã§ã®ããã²ãŒã·ã§ã³ãç°¡çŽ åããŸãããŠãŒã¶ãŒã¯åžžã«èªåã®çŸåšå°ãšè¡šç€ºãããŠããå å®¹ãææ¡ã§ããŸãã
- ã¢ãã€ã«ãã¬ã³ããªãŒïŒå°ããªç»é¢ã§ã¯ãæä»çã¢ã³ãŒãã£ãªã³ã¯è²Žéãªç»é¢ã¹ããŒã¹ãç¯çŽããããè¯ããŠãŒã¶ãŒäœéšãæäŸããŸãã
- ããæç¢ºãªéå±€ïŒåäžééã®ä»çµã¿ã¯ãã³ã³ãã³ãã®éå±€æ§é ã匷åããçè§£ããããããŸãã
CSSã®ã¿ã®ã¢ãããŒã
ã¢ã³ãŒãã£ãªã³ã®äœæã«ã¯JavaScriptã䜿çšã§ããŸãããCSSã®ã¿ã®ã¢ãããŒãã«ã¯ããã€ãã®å©ç¹ããããŸãïŒ
- JavaScriptãžã®éäŸåïŒJavaScriptã®å¿ èŠæ§ããªãããããŒãžã®èªã¿èŸŒã¿æéãççž®ããæœåšçãªäºææ§ã®åé¡ãæžãããŸãã
- ã¢ã¯ã»ã·ããªãã£ïŒæ£ããå®è£ ãããã°ãCSSã®ã¿ã®ã¢ã³ãŒãã£ãªã³ã¯é害ãæã€ãŠãŒã¶ãŒã«ãšã£ãŠããã¢ã¯ã»ã·ãã«ã«ãªããŸãã
- ã·ã³ãã«ãïŒåºæ¬çãªã¢ã³ãŒãã£ãªã³æ©èœã®å ŽåãCSSã®ã¿ã®ã¢ãããŒãã¯å®è£ ãšä¿å®ãããç°¡åã«ãªãããšããããŸãã
æä»çã¢ã³ãŒãã£ãªã³ã®æ§ç¯ïŒã¹ããããã€ã¹ããã
CSSã®ã¿ã§æä»çã¢ã³ãŒãã£ãªã³ãäœæããããã»ã¹ãåè§£ããŠã¿ãŸããããHTMLæ§é ãCSSã¹ã¿ã€ãªã³ã°ããããŠåäžééã¡ã«ããºã ã®èåŸã«ããããžãã¯ã«ã€ããŠèª¬æããŸãã
1. HTMLæ§é
ã¢ã³ãŒãã£ãªã³ã®åºç€ã¯HTMLæ§é ã§ãã<input type="radio">
èŠçŽ ã<label>
èŠçŽ ã<div>
èŠçŽ ãçµã¿åãããŠã¢ã³ãŒãã£ãªã³ã®ã»ã¯ã·ã§ã³ãäœæããŸãã
<div class="accordion">
<input type="radio" name="accordion" id="section1" checked>
<label for="section1">ã»ã¯ã·ã§ã³1</label>
<div class="content">
<p>ã»ã¯ã·ã§ã³1ã®ã³ã³ãã³ãã</p>
</div>
<input type="radio" name="accordion" id="section2">
<label for="section2">ã»ã¯ã·ã§ã³2</label>
<div class="content">
<p>ã»ã¯ã·ã§ã³2ã®ã³ã³ãã³ãã</p>
</div>
<input type="radio" name="accordion" id="section3">
<label for="section3">ã»ã¯ã·ã§ã³3</label>
<div class="content">
<p>ã»ã¯ã·ã§ã³3ã®ã³ã³ãã³ãã</p>
</div>
</div>
解説ïŒ
<div class="accordion">
ïŒããã¯ã¢ã³ãŒãã£ãªã³å šäœãå²ãã¡ã€ã³ã³ã³ããã§ãã<input type="radio" name="accordion" id="section1" checked>
ïŒåã»ã¯ã·ã§ã³ã¯ã©ãžãªãã¿ã³ã§å§ãŸããŸããname="accordion"
屿§ãéèŠã§ããããã«ããããã¹ãŠã®ã©ãžãªãã¿ã³ãã°ã«ãŒãåãããäžåºŠã«1ã€ããéžæã§ããªãããã«ãªããŸããid
屿§ã¯ãã©ãžãªãã¿ã³ãšå¯Ÿå¿ããã©ãã«ããªã³ã¯ããããã«äœ¿çšãããŸããæåã®ã©ãžãªãã¿ã³ã®checked
屿§ã«ããããã®ã»ã¯ã·ã§ã³ãããã©ã«ãã§éããç¶æ ã«ãªããŸãã<label for="section1">ã»ã¯ã·ã§ã³1</label>
ïŒã©ãã«ã¯åã»ã¯ã·ã§ã³ã®ã¯ãªãã¯å¯èœãªããããŒãšããŠæ©èœããŸããfor
屿§ã¯ã察å¿ããã©ãžãªãã¿ã³ã®id
ãšäžèŽããå¿ èŠããããŸãã<div class="content">
ïŒããã«ã¯åã»ã¯ã·ã§ã³ã®å®éã®ã³ã³ãã³ããå«ãŸããŸããåæç¶æ ã§ã¯ããã®ã³ã³ãã³ãã¯é衚瀺ã«ãªããŸãã
2. CSSã¹ã¿ã€ãªã³ã°
次ã«ãCSSã䜿çšããŠã¢ã³ãŒãã£ãªã³ãã¹ã¿ã€ãªã³ã°ããŸããããã©ãžãªãã¿ã³ãé衚瀺ã«ããã©ãã«ãã¹ã¿ã€ãªã³ã°ããã©ãžãªãã¿ã³ã®ç¶æ ã«åºã¥ããŠã³ã³ãã³ãã®è¡šç€º/é衚瀺ãå¶åŸ¡ããããšã«çŠç¹ãåœãŠãŸãã
.accordion {
width: 100%;
border: 1px solid #ccc;
margin-bottom: 10px;
}
.accordion input[type="radio"] {
display: none;
}
.accordion label {
display: block;
padding: 10px;
background-color: #eee;
border-bottom: 1px solid #ccc;
cursor: pointer;
font-weight: bold;
}
.accordion .content {
padding: 10px;
background-color: #fff;
border-bottom: 1px solid #ccc;
display: none;
}
.accordion input[type="radio"]:checked + label {
background-color: #ddd;
}
.accordion input[type="radio"]:checked + label + .content {
display: block;
}
解説ïŒ
.accordion input[type="radio"] { display: none; }
ïŒããã«ãããã©ãžãªãã¿ã³ãé衚瀺ã«ãªããŸããæ©èœã¯ããŸããããŠãŒã¶ãŒã«ã¯èŠããŸããã.accordion label { ... }
ïŒããã«ããã©ãã«ãã¹ã¿ã€ãªã³ã°ãããã¯ãªãã¯å¯èœãªããããŒã®ããã«èŠããŸããcursor
ãpointer
ã«èšå®ããŠãã€ã³ã¿ã©ã¯ãã£ãã§ããããšã瀺ããŸãã.accordion .content { ... display: none; }
ïŒåæç¶æ ã§ã¯ãdisplay: none;
ã䜿çšããŠåã»ã¯ã·ã§ã³ã®ã³ã³ãã³ããé衚瀺ã«ããŸãã.accordion input[type="radio"]:checked + label { ... }
ïŒããã¯çŸåšéžæãããŠããïŒãã§ãã¯ãããïŒã©ãžãªãã¿ã³ã®ã©ãã«ãã¹ã¿ã€ãªã³ã°ããŸããèæ¯è²ã倿ŽããŠã¢ã¯ãã£ãã§ããããšã瀺ããŸãã+
ïŒé£æ¥å åŒçµååïŒã¯ããã§ãã¯ãããã©ãžãªãã¿ã³ã®çŽåŸã«ããã©ãã«ãã¿ãŒã²ããã«ããŸãã.accordion input[type="radio"]:checked + label + .content { ... display: block; }
ïŒããã«ãããçŸåšéžæãããŠããã»ã¯ã·ã§ã³ã®ã³ã³ãã³ãã衚瀺ãããŸããããã§ã飿¥å åŒçµååïŒ+
ïŒã2å䜿çšããŠããã§ãã¯ãããã©ãžãªãã¿ã³ã®çŽåŸã«ããã©ãã«ã®ãããã«çŽåŸã«ãã.content
divãã¿ãŒã²ããã«ããŸãããããCSSã®ã¿ã®ã¢ã³ãŒãã£ãªã³ããžãã¯ã®éµã§ãã
3. ã¢ã¯ã»ã·ããªãã£ã«é¢ããèæ ®äºé
ã¢ã¯ã»ã·ããªãã£ã¯ããããããŠã§ãã³ã³ããŒãã³ãã«ãšã£ãŠéåžžã«éèŠã§ããCSSã®ã¿ã®ã¢ã³ãŒãã£ãªã³ãã¢ã¯ã»ã·ãã«ã«ããããã®èæ ®äºé ãããã€ã玹ä»ããŸãïŒ
- ããŒããŒãããã²ãŒã·ã§ã³ïŒãŠãŒã¶ãŒãããŒããŒãã䜿çšããŠã¢ã³ãŒãã£ãªã³ãæäœã§ããããã«ããŸããã©ãžãªãã¿ã³ã¯æ¬è³ªçã«ããŒããŒãã§ãã©ãŒã«ã¹å¯èœã§ãããã©ãã«ã«ãã©ãŒã«ã¹ãåœãã£ããšãã«èŠèŠçãªåå³ïŒäŸïŒãã©ãŒã«ã¹ã¢ãŠãã©ã€ã³ïŒã远å ãããšè¯ãã§ãããã
- ARIA屿§ïŒARIA屿§ã䜿çšããŠãã¹ã¯ãªãŒã³ãªãŒããŒã«è¿œå ã®ã»ãã³ãã£ãã¯ãªæ
å ±ãæäŸããŸããäŸãã°ã
aria-expanded
ã䜿çšããŠã»ã¯ã·ã§ã³ãéããŠãããéããŠãããã瀺ããaria-controls
ã䜿çšããŠã©ãã«ãšå¯Ÿå¿ããã³ã³ãã³ãã»ã¯ã·ã§ã³ããªã³ã¯ãããããšãã§ããŸãã - ã»ãã³ãã£ãã¯HTMLïŒé©åãªå Žæã§ã»ãã³ãã£ãã¯ãªHTMLèŠçŽ ã䜿çšããŸããäŸãã°ãã»ã¯ã·ã§ã³ã®èŠåºãã«ã¯ãåã«ã©ãã«ãã¹ã¿ã€ãªã³ã°ããã ãã§ãªãã
<h2>
ã<h3>
èŠçŽ ã®äœ¿çšãæ€èšããŠãã ããã - ã³ã³ãã©ã¹ãïŒèªã¿ãããã®ããã«ãããã¹ããšèæ¯ã®éã«ååãªã«ã©ãŒã³ã³ãã©ã¹ãã確ä¿ããŠãã ããã
以äžã¯ãHTMLæ§é ã«ARIA屿§ã远å ããæ¹æ³ã®äŸã§ãïŒ
<div class="accordion">
<input type="radio" name="accordion" id="section1" checked aria-controls="content1">
<label for="section1" aria-expanded="true">ã»ã¯ã·ã§ã³1</label>
<div class="content" id="content1" aria-hidden="false">
<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">ã»ã¯ã·ã§ã³2</label>
<div class="content" id="content2" aria-hidden="true">
<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">ã»ã¯ã·ã§ã³3</label>
<div class="content" id="content3" aria-hidden="true">
<p>ã»ã¯ã·ã§ã³3ã®ã³ã³ãã³ãã</p>
</div>
</div>
ãããŠãaria-expanded
ãšaria-hidden
ãæŽæ°ããããã®å¯Ÿå¿ããCSSã§ãïŒ
.accordion [aria-expanded="true"] {
background-color: #ddd;
}
.accordion [aria-hidden="false"] {
display: block;
}
.accordion [aria-hidden="true"] {
display: none;
}
4. é«åºŠãªã«ã¹ã¿ãã€ãº
åºæ¬çãªã¢ã³ãŒãã£ãªã³æ§é ã¯ãç¹å®ã®ãã¶ã€ã³èŠä»¶ã«åãããŠããŸããŸãªæ¹æ³ã§ã«ã¹ã¿ãã€ãºã§ããŸãïŒ
- ã¢ãã¡ãŒã·ã§ã³ïŒCSSã®ãã©ã³ãžã·ã§ã³ãã¢ãã¡ãŒã·ã§ã³ã远å ããŠãã³ã³ãã³ãã»ã¯ã·ã§ã³ãã¹ã ãŒãºã«ééãããŸããäŸãã°ã
transition
ããããã£ã䜿çšããŠã³ã³ãã³ãã®height
ãopacity
ãã¢ãã¡ãŒã·ã§ã³åã§ããŸãã - ã¢ã€ã³ã³ïŒã©ãã«ã«ã¢ã€ã³ã³ãå«ããŠãåã»ã¯ã·ã§ã³ã®ééç¶æ
ãèŠèŠçã«ç€ºããŸããCSSã®ç䌌èŠçŽ ïŒ
::before
ãŸãã¯::after
ïŒã䜿çšããŠã¢ã€ã³ã³ã远å ã§ããŸãã - ããŒãèšå®ïŒãŠã§ããµã€ãå šäœã®ãã¶ã€ã³ã«åãããŠãè²ããã©ã³ããã¹ããŒã·ã³ã°ãã«ã¹ã¿ãã€ãºããŸãã
以äžã¯ãã³ã³ãã³ãã®é«ãã«ç°¡åãªãã©ã³ãžã·ã§ã³ã远å ããäŸã§ãïŒ
.accordion .content {
padding: 10px;
background-color: #fff;
border-bottom: 1px solid #ccc;
display: none;
height: 0;
overflow: hidden;
transition: height 0.3s ease-in-out;
}
.accordion input[type="radio"]:checked + label + .content {
display: block;
height: auto; /* éèŠïŒã³ã³ãã³ããèªç¶ãªé«ãã«å±éã§ããããã«ããŸã */
}
5. ã°ããŒãã«ãªäœ¿çšäŸãšå¿çš
CSSã®ã¿ã®æä»çã¢ã³ãŒãã£ãªã³ã¯ãããŸããŸãªæåãå°åãè¶ ããŠå€æ§ãªæèã«é©å¿ã§ããæ±çšæ§ã®é«ããã¿ãŒã³ã§ãã以äžã«ããã€ãã®äŸãæããŸãïŒ
- eã³ããŒã¹ã®è£œåããŒãžïŒä»æ§ãã¬ãã¥ãŒãé éæ å ±ãªã©ã®è£œåè©³çŽ°ãæŽçããŠè¡šç€ºããŸããè£œåæ å ±ã¯å Žæã«é¢ããããªã³ã©ã€ã³ã·ã§ããã³ã°ã§éèŠã§ãããããããã¯äžççã«é©çšå¯èœã§ãã
- FAQã»ã¯ã·ã§ã³ïŒãããã質åãšãã®åçã衚瀺ããŸããããã¯äžçäžã®ãŠã§ããµã€ãã§äžè¬çãªäœ¿çšäŸã§ããããŠãŒã¶ãŒãè¿ éã«æ å ±ãèŠã€ãããµããŒããžã®åãåãããæžããã®ã«åœ¹ç«ã¡ãŸãã
- ããã¥ã¡ã³ããšãã¥ãŒããªã¢ã«ïŒè€éãªããã¥ã¡ã³ãããã¥ãŒããªã¢ã«ã®ã³ã³ãã³ãã管çããããã»ã¯ã·ã§ã³ã«æŽçããŸããããã¯ãœãããŠã§ã¢äŒæ¥ãæè²æ©é¢ããããŠäžççã«ãªã³ã©ã€ã³åŠç¿ãªãœãŒã¹ãæäŸããããããçµç¹ã«ãšã£ãŠæçã§ãã
- ã¢ãã€ã«ããã²ãŒã·ã§ã³ïŒç¹ã«ã¡ãã¥ãŒé ç®ãå€ããŠã§ããµã€ãã§ãæä»çã¢ã³ãŒãã£ãªã³ã䜿çšããŠã¢ãã€ã«ãã¬ã³ããªãŒãªããã²ãŒã·ã§ã³ã¡ãã¥ãŒãäœæããŸããããã¯ã¹ããŒããã©ã³ãã¿ãã¬ããã§ãŠã§ããµã€ãã«ã¢ã¯ã»ã¹ãããŠãŒã¶ãŒã«ãšã£ãŠãã·ãŒã ã¬ã¹ãªäœéšãä¿èšŒããããã«äžå¯æ¬ ã§ãã
- ãã©ãŒã ïŒé·ããã©ãŒã ãã¢ã³ãŒãã£ãªã³æ§é ã䜿çšããŠãããå°ãã管çããããã¹ãããã«åå²ããŸããããã«ããããŠãŒã¶ãŒã®å ¥åå®äºçãåäžããããã©ãŒã é¢è±ãæžããããšãã§ããŸããæå€§éã®ãŠãŒã¶ãŒäœéšã®ããã«ãã©ãã«ãçŸå°ã®èšèªã«ç¿»èš³ããããšãæ€èšããŠãã ããã
6. ããããèœãšã穎ãšè§£æ±ºç
CSSã®ã¿ã®ã¢ãããŒãã¯å¹æçã§ãããæ³šæãã¹ãæœåšçãªèœãšã穎ãããã€ããããŸãïŒ
- CSSã®è©³çŽ°åºŠïŒCSSã«ãŒã«ãç«¶åããã¹ã¿ã€ã«ãäžæžãããã®ã«ååãªè©³çŽ°åºŠãæã€ããã«ããŸããããå
·äœçãªã»ã¬ã¯ã¿ã䜿çšãããã
!important
ããŒã¯ãŒããæ éã«äœ¿çšããŠãã ããã - ã¢ã¯ã»ã·ããªãã£ã®åé¡ïŒã¢ã¯ã»ã·ããªãã£ãžã®é æ ®ãæ ããšãé害ãæã€ãŠãŒã¶ãŒã«ãšã£ãŠéå£ãšãªãå¯èœæ§ããããŸããåžžã«ã¹ã¯ãªãŒã³ãªãŒããŒãšããŒããŒãããã²ãŒã·ã§ã³ã§ã¢ã³ãŒãã£ãªã³ããã¹ãããŠãã ããã
- è€éãªã³ã³ãã³ãïŒã¢ã³ãŒãã£ãªã³ã»ã¯ã·ã§ã³å ã«éåžžã«è€éãªã³ã³ãã³ããããå ŽåãJavaScriptããŒã¹ã®ãœãªã¥ãŒã·ã§ã³ã®æ¹ãæè»æ§ãšå¶åŸ¡æ§ãé«ãå ŽåããããŸãã
- ãã©ãŠã¶ã®äºææ§ïŒããŸããŸãªãã©ãŠã¶ã§ã¢ã³ãŒãã£ãªã³ããã¹ãããäžè²«ããåäœã確èªããŠãã ãããã»ãšãã©ã®ã¢ãã³ãã©ãŠã¶ã¯ãã®ã¢ãããŒãã§äœ¿çšãããCSSã»ã¬ã¯ã¿ããµããŒãããŠããŸãããå€ããã©ãŠã¶ã§ã¯ããªãã£ã«ã代æ¿ãœãªã¥ãŒã·ã§ã³ãå¿ èŠã«ãªãå ŽåããããŸãã
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