Document.getElementsByTagNameNS()

在此页

句法
范例
其它不支持浏览器的潜在解决方案
规范
浏览器兼容性
另请参阅
相关话题

返回属于给定名称空间采用给定标签名称的元素列表。搜索完整文档，包括根节点。

句法

elements = document.getElementsByTagNameNS(namespace, name)

元素 是实时 NodeList (但请参阅以下注意事项) 找到的元素按照它们在树中出现的次序排列。
namespace is the namespace URI of elements to look for (see element.namespaceURI ).
名称 is either the local name of elements to look for or the special value * , which matches all elements (see element.localName ).

注意： While the W3C specification says 元素 是 NodeList , this method returns a HTMLCollection both in Gecko and Internet Explorer. Opera returns a NodeList , but with a namedItem method implemented, which makes it similar to a HTMLCollection . As of January 2012, only in WebKit browsers is the returned value a pure NodeList 。见 bug 14869 了解细节。

注意： Currently parameters in this method are case-sensitive, but they were case-insensitive in Firefox 3.5 and before. See the developer release note for Firefox 3.6 and a note in Browser compatibility section in Element.getElementsByTagNameNS 了解细节。

范例

In the following example getElementsByTagNameNS starts from a particular parent element, and searches topdown recursively through the DOM from that parent element, looking for child elements matching the tag 名称 参数。

Note that when the node on which getElementsByTagName is invoked is not the document node, in fact the element.getElementsByTagNameNS method is used.

To use the following example, just copy/paste it into a new file saved with the .xhtml extension.

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>getElementsByTagNameNS example</title>
<script type="text/javascript">
function getAllParaElems()
{
  var allParas = document.getElementsByTagNameNS("http://www.w3.org/1999/xhtml", "p");
  var num = allParas.length;
  alert("There are " + num + " <p> elements in this document");
}
function div1ParaElems()
{
  var div1 = document.getElementById("div1")
  var div1Paras = div1.getElementsByTagNameNS("http://www.w3.org/1999/xhtml", "p");
  var num = div1Paras.length;
  alert("There are " + num + " <p> elements in div1 element");
}
function div2ParaElems()
{
  var div2 = document.getElementById("div2")
  var div2Paras = div2.getElementsByTagNameNS("http://www.w3.org/1999/xhtml", "p");
  var num = div2Paras.length;
  alert("There are " + num + " <p> elements in div2 element");
}
</script>
</head>
<body style="border: solid green 3px">
<p>Some outer text</p>
<p>Some outer text</p>
  <div id="div1" style="border: solid blue 3px">
    <p>Some div1 text</p>
    <p>Some div1 text</p>
    <p>Some div1 text</p>
    <div id="div2" style="border: solid red 3px">
    <p>Some div2 text</p>
    <p>Some div2 text</p>
    </div>
  </div>
<p>Some outer text</p>
<p>Some outer text</p>
<button onclick="getAllParaElems();">
 show all p elements in document</button><br />
<button onclick="div1ParaElems();">
 show all p elements in div1 element</button><br />
<button onclick="div2ParaElems();">
 show all p elements in div2 element</button>
</body>
</html>

其它不支持浏览器的潜在解决方案

If the desired browser did not support XPath, another approach (such as traversing the DOM through all its children, identifying all @xmlns instances, etc.) would be necessary to find all tags with the desired local name and namespace, but XPath is much faster. (To accommodate Explorer, one could call an XPath wrapper instead of the XPath in the function below (as Explorer supports XPath with a different API), such as this wrapper class )。

function getElementsByTagNameNSWrapper (ns, elName, doc, context) {
 if (!doc) {
  doc = document;
 }
 if (!context) {
  context = doc;
 }
 var result = doc.evaluate('//*[local-name()="'+elName+'" and namespace-uri() = "'+ns+'"]', context, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        var a = [];
        for(var i = 0; i < result.snapshotLength; i++) {
            a[i] = result.snapshotItem(i);
        }
        return a;
}

规范

规范	状态	注释
DOM The definition of 'document.getElementsByTagNameNS' in that specification.	实时标准

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`getElementsByTagNameNS`	Chrome 1	Edge 12	Firefox Yes	IE ?	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持
兼容性未知 ?

另请参阅

Element.getElementsByTagNameNS()

元数据

最后修改： Jan 8, 2020

在此页

句法

范例

其它不支持浏览器的潜在解决方案

规范

浏览器兼容性

图例

另请参阅

相关话题