Element.attributes

 

The Element.attributes property returns a live collection of all attribute nodes registered to the specified node. It is a NamedNodeMap, not an Array, so it has no Array methods and the Attr nodes' indexes may differ among browsers. To be more specific, attributes is a key/value pair of strings that represents any information regarding that attribute.

 

Element.attribute 特性會把特定節點裡所有的屬性變成一個集合,然後回傳出來. 這是一個  NamedNodeMap, 而並非一個陣列. 所以它並沒有陣列的方法和在瀏覽器中  Attr節點裡的索引值也可能不同. 更詳細的來說, attributes 是一個鍵/值的配對, 它包含了所有有關於這個節點屬性的資訊

 

Syntax

var attr = element.attributes;

Example

Basic examples

// Get the first <p> element in the document
var para = document.getElementsByTagName("p")[0];
var atts = para.attributes;

Enumerating elements attributes

Numerical indexing is useful for going through all of an element's attributes.
The following example runs through the attribute nodes for the element in the document with id "paragraph", and prints each attribute's value.

<!DOCTYPE html>

<html>

 <head>
  <title>Attributes example</title>
  <script type="text/javascript">
   function listAttributes() {
     var paragraph = document.getElementById("paragraph");
     var result = document.getElementById("result");

     // First, let's verify that the paragraph has some attributes    
     if (paragraph.hasAttributes()) {
       var attrs = paragraph.attributes;
       var output = "";
       for(var i = attrs.length - 1; i >= 0; i--) {
         output += attrs[i].name + "->" + attrs[i].value;
       }
       result.value = output;
     } else {
       result.value = "No attributes to show";
     }
   }
  </script>
 </head>

<body>
 <p id="paragraph" style="color: green;">Sample Paragraph</p>
 <form action="">
  <p>
    <input type="button" value="Show first attribute name and value"
      onclick="listAttributes();">
    <input id="result" type="text" value="">
  </p>
 </form>
</body>
</html>

Specifications

Specification Status Comment
DOM
The definition of 'Element.attributes' in that specification.
Living Standard From Document Object Model (DOM) Level 3 Core Specification, moved from Node to Element
Document Object Model (DOM) Level 3 Core Specification
The definition of 'Element.attributes' in that specification.
Obsolete No change from Document Object Model (DOM) Level 2 Core Specification
Document Object Model (DOM) Level 2 Core Specification
The definition of 'Element.attributes' in that specification.
Obsolete No change from Document Object Model (DOM) Level 1 Specification
Document Object Model (DOM) Level 1 Specification
The definition of 'Element.attributes' in that specification.
Obsolete Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
attributesChrome Full support 26Edge Full support 16Firefox Full support 22IE ? Opera Full support YesSafari Full support 6WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 22Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also

  • NamedNodeMap, the interface of the returned object
  • Cross-browser compatibility considerations: on quirksmode