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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/ja/web/api/globaleventhandlers/onmousedown/index.html | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/ja/web/api/globaleventhandlers/onmousedown/index.html b/files/ja/web/api/globaleventhandlers/onmousedown/index.html new file mode 100644 index 0000000000..b983b353c0 --- /dev/null +++ b/files/ja/web/api/globaleventhandlers/onmousedown/index.html @@ -0,0 +1,121 @@ +--- +title: element.onmousedown +slug: Web/API/globalEventhandlers/onmousedown +tags: + - API + - Event Handler + - GlobalEventHandlers + - HTML DOM + - Property + - Reference +translation_of: Web/API/GlobalEventHandlers/onmousedown +--- +<div>{{ ApiRef("HTML DOM") }}</div> + +<p><strong><code>onmousedown</code></strong> は {{domxref("GlobalEventHandlers")}} ミックスインのプロパティで、{{event("mousedown")}} イベントを処理する{{domxref("EventHandler" ,"イベントハンドラー")}}です。</p> + +<p><code>mousedown</code> イベントは、ユーザーがマウスボタンを押したときに発生します。</p> + +<div class="blockIndicator note"> +<p><strong>メモ:</strong> <code>onmousedown</code> の反対の動作は {{domxref("GlobalEventHandlers.onmouseup", "onmouseup")}} です。</p> +</div> + +<h2 id="構文">構文</h2> + +<pre class="syntaxbox notranslate"><em>target</em>.onmousedown = <em>functionRef</em>; +</pre> + +<h3 id="値">値</h3> + +<p><code>functionRef</code> は、関数名または<a href="/docs/Web/JavaScript/Reference/Operators/function">関数式</a>です。この関数は、唯一の引数として {{domxref("MouseEvent")}} オブジェクトを受け取ります。</p> + +<h2 id="例">例</h2> + +<p>この例は、マウスボタンを押したままにすると画像の一部を表示します。<code>onmousedown</code>, {{domxref("GlobalEventHandlers.onmouseup", "onmouseup")}}, {{domxref("GlobalEventHandlers.onmousemove", "onmousemove")}} イベントハンドラーを使用します。</p> + +<h3 id="HTML">HTML</h3> + +<pre class="brush: html notranslate"><div class="container"> + <div class="view" hidden></div> + <img src="https://interactive-examples.mdn.mozilla.net/media/examples/gecko-320-213.jpg"> +</div></pre> + +<h3 id="CSS">CSS</h3> + +<pre class="brush: css notranslate">.container { + width: 320px; + height: 213px; + background: black; +} + +.view { + position: absolute; + width: 100px; + height: 100px; + background: white; + border-radius: 50%; +} + +img { + mix-blend-mode: darken; +}</pre> + +<h3 id="JavaScript">JavaScript</h3> + +<pre class="brush: js notranslate">function showView(event) { + view.removeAttribute('hidden'); + view.style.left = event.clientX - 50 + 'px'; + view.style.top = event.clientY - 50 + 'px'; + event.preventDefault(); +} + +function moveView(event) { + view.style.left = event.clientX - 50 + 'px'; + view.style.top = event.clientY - 50 + 'px'; +} + +function hideView(event) { + view.setAttribute('hidden', ''); +} + +const container = document.querySelector('.container'); +const view = document.querySelector('.view'); + +container.onmousedown = showView; +container.onmousemove = moveView; +document.onmouseup = hideView;</pre> + +<h3 id="結果">結果</h3> + +<p>{{EmbedLiveSample("Example", 700, 300)}}</p> + +<h2 id="仕様">仕様</h2> + +<table class="spectable standard-table"> + <tbody> + <tr> + <th scope="col">仕様書</th> + <th scope="col">状態</th> + <th scope="col">備考</th> + </tr> + <tr> + <td>{{SpecName('HTML WHATWG','webappapis.html#handler-onmousedown','onmousedown')}}</td> + <td>{{Spec2('HTML WHATWG')}}</td> + <td></td> + </tr> + </tbody> +</table> + +<h2 id="ブラウザの互換性">ブラウザの互換性</h2> + +<div> + + +<p>{{Compat("api.GlobalEventHandlers.onmousedown")}}</p> +</div> + +<h2 id="関連情報">関連情報</h2> + +<ul> + <li>{{event("mousedown")}} event</li> +</ul> |