diff options
Diffstat (limited to 'files/de/web/api/element/queryselectorall/index.html')
| -rw-r--r-- | files/de/web/api/element/queryselectorall/index.html | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/files/de/web/api/element/queryselectorall/index.html b/files/de/web/api/element/queryselectorall/index.html new file mode 100644 index 0000000000..009a105b89 --- /dev/null +++ b/files/de/web/api/element/queryselectorall/index.html @@ -0,0 +1,206 @@ +--- +title: Element.querySelectorAll() +slug: Web/API/Element/querySelectorAll +tags: + - Méthode + - Referenz +translation_of: Web/API/Element/querySelectorAll +--- +<div>{{APIRef("DOM")}}</div> + +<h2 id="Summary" name="Summary">Summary</h2> + +<p>Gibt eine statische <a href="/en-US/docs/DOM/NodeList" title="DOM/NodeList"><code>NodeList</code></a> aller Elemente absteigend des Elements, auf welchem querySelectorAll ausgeführt wird, die mit den angegebenen CSS Selektoren übereinstimmen.</p> + +<h2 id="Syntax" name="Syntax">Syntax</h2> + +<pre class="syntaxbox"><em>elementList</em> = baseElement.querySelectorAll(<em>selectors</em>); +</pre> + +<p>wobei:</p> + +<dl> + <dt><code>elementList</code></dt> + <dd>ist statische Node Liste [<code> NodeList[elements]</code> <code>] mit</code> <a href="/en-US/docs/DOM/element" title="DOM/Element">element</a> Objekten.</dd> + <dt><code>baseElement</code></dt> + <dd>ist ein <a href="/en-US/docs/DOM/element" title="DOM/element">element</a> Objekt.</dd> + <dt><code>selectors</code></dt> + <dd>ist eine Gruppe von <a href="/en-US/docs/Web/Guide/CSS/Getting_Started/Selectors">Selektoren</a> die mit dem Element im DOM übereinstimmen soll. </dd> +</dl> + +<h2 id="Example" name="Example">Beispiele</h2> + +<p>Dieses Beispiel gibt eine Liste der <code>p</code> Elementen im HTML body zurück:</p> + +<pre class="brush: js">let matches = document.body.querySelectorAll('p'); +</pre> + +<p>Dieses Beispiel gibt eine Liste der <code>p</code> Unter-Elementen eines Containers, dessen Überobjekt ein <code>div</code> mit der Klasse 'highlighted' ist:</p> + +<pre class="brush:js">let el = document.querySelector('#test'); //return an element with id='test' +let matches = el.querySelectorAll('div.highlighted > p'); // return a NodeList of p wrapped in a div with attribute class "highlighted" +</pre> + +<p>Dieses Beispiel gibt eine Liste der <code>iframe</code> Elementen die ein <strong>data</strong> Attribut 'src' besitzen:</p> + +<pre class="brush: js">let matches = el.querySelectorAll('iframe[data-src]'); +</pre> + +<h2 id="Notes" name="Notes">Bemerkungen</h2> + +<p>If the specified "selectors" are not found inside the DOM of the page, the method <code>queryselectorAll</code> returns an empty NodeList as specified below:</p> + +<pre class="brush: js">> let x = document.body.querySelectorAll('.highlighted'); //case: if the class highlighted doesn't exist in any attribute "class" of the DOM the result is +> [] //empty NodeList</pre> + +<p><code>querySelectorAll()</code> was introduced in the WebApps API.</p> + +<p>The string argument pass to <code>querySelectorAll</code> must follow the CSS syntax. See {{domxref("document.querySelector")}} for a concrete example.</p> + +<p>We could access a single item inside the NodeList in the following way:</p> + +<pre class="brush: js">let x = document.body.querySelectorAll('.highlighted'); +x.length; //return the size of x +x[i_item]; //where i_item has a value between 0 and x.length-1. The operator "[]" return as in an array the element at index "i_item" +</pre> + +<p>We could iterate inside a NodeList with the construct <code>for(....) {...} </code>as in the following code:</p> + +<pre class="brush: js"> let x = document.body.querySelectorAll('.highlighted'); + let index = 0; + for( index=0; index < x.length; index++ ) { + console.log(x[index]); + }</pre> + +<p>So in the above way, it is possible to manage and modify the behaviour of the page.</p> + +<h2 id="Quirks">Quirks</h2> + +<p><code>querySelectorAll()</code> behaves differently than most common JavaScript DOM libraries, which might lead to unexpected results:</p> + +<pre class="brush: html"><div class="outer"> + <div class="select"> + <div class="inner"> + </div> + </div> +</div></pre> + +<pre class="brush: js">let select = document.querySelector('.select'); +let inner = select.querySelectorAll('.outer .inner'); +inner.length; // 1, not 0! +</pre> + +<p>In this example, when selecting <code>.outer .inner</code> in the context of <code>.select</code>, .<code>inner</code> is still found, even though <code>.outer</code> is not a descendant of the baseElement (<code>.select</code>).<br> + <code>querySelectorAll() </code>only verifies that the last element in the selector is within the baseElement.</p> + +<p>The <code><a href="/en-US/docs/Web/CSS/:scope">:scope</a></code> pseudo-class restores the expected behavior, only matching selectors on descendants of the baseElement:</p> + +<pre class="brush: js">let select = document.querySelector('.select'); +let inner = select.querySelectorAll(':scope .outer .inner'); +inner.length; // 0 +</pre> + +<h2 id="Specifications">Specifications</h2> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + </thead> + <tbody> + <tr> + <td>{{SpecName('DOM4','#dom-parentnode-queryselectorallselectors','querySelectorAll')}}</td> + <td>{{Spec2('DOM4')}}</td> + <td> </td> + </tr> + <tr> + <td>{{SpecName('Selectors API Level 2','#queryselectorall','querySelectorAll')}}</td> + <td>{{Spec2('Selectors API Level 2')}}</td> + <td> </td> + </tr> + <tr> + <td>{{SpecName('Selectors API Level 1','#queryselectorall','querySelectorAll')}}</td> + <td>{{Spec2('Selectors API Level 1')}}</td> + <td> </td> + </tr> + </tbody> +</table> + +<h2 id="Browser_compatibility">Browser compatibility</h2> + +<div>{{CompatibilityTable}}</div> + +<div id="compat-desktop"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Chrome</th> + <th>Firefox (Gecko)</th> + <th>Internet Explorer</th> + <th>Opera</th> + <th>Safari (WebKit)</th> + </tr> + <tr> + <td>Basic support</td> + <td>1</td> + <td>{{CompatGeckoDesktop("1.9.1")}}</td> + <td>8</td> + <td>10</td> + <td>3.2 (525.3)</td> + </tr> + <tr> + <td><code>:scope</code> pseudo-class</td> + <td>{{ CompatVersionUnknown }}</td> + <td>32</td> + <td>{{CompatNo}}</td> + <td>15<sup>[1]</sup></td> + <td>7.0</td> + </tr> + </tbody> +</table> +</div> + +<div id="compat-mobile"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Android</th> + <th>Firefox Mobile (Gecko)</th> + <th>IE Phone</th> + <th>Opera Mobile</th> + <th>Safari Mobile</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatGeckoMobile("1.9.1")}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + </tr> + <tr> + <td><code>:scope</code> pseudo-class</td> + <td>{{ CompatUnknown }}</td> + <td>32</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>7.0</td> + </tr> + </tbody> +</table> +</div> + +<p>[1] Supported in Opera 15+ by enabling the "<strong>Enable <style scoped></strong>" or "<strong>Enable experimental Web Platform features</strong>" flag in <code>chrome://flags</code>.</p> + +<h2 id="See_also" name="See_also">See also</h2> + +<ul> + <li><a href="/en-US/docs/DOM/Document.querySelectorAll" title="DOM/document.querySelectorAll"><code>document.querySelectorAll</code></a></li> + <li><a href="/en-US/docs/DOM/Document.querySelector" title="DOM/document.querySelector"><code>document.querySelector</code></a></li> + <li><a href="/en-US/docs/Code_snippets/QuerySelector" title="Code_snippets/QuerySelector">Code snippets for <code>querySelector</code></a></li> +</ul> |