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    HTMLCollection

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    The HTMLCollection interface represents a generic collection (array-like object) of elements (in document order) and offers methods and properties for selecting from the list.

    Note: This interface is called HTMLCollection for historical reasons (before DOM4, collections implementing this interface could only have HTML elements as their items).

    An HTMLCollection in the HTML DOM is live; it is automatically updated when the underlying document is changed.

    Properties

    HTMLCollection.length Read only
    Returns the number of items in the collection.

    Methods

    HTMLCollection.item()
    Returns the specific node at the given zero-based index into the list. Returns null if the index is out of range.
    HTMLCollection.namedItem()
    Returns the specific node whose ID or, as a fallback, name matches the string specified by name. Matching by name is only done as a last resort, only in HTML, and only if the referenced element supports the name attribute. Returns null if no node exists by the given name.

    Usage in JavaScript

    In JavaScript, code that accesses HTMLCollection object, in order to get an item of the given HTMLCollection, the square bracket syntax can be used instead of directly calling the item() or namedItem() methods. Numeric values in the square brackets will work the same way as item(), string values will work the same way as namedItem().

    For example, assuming there is one <form> element in the document and its id is "myForm":

    var elem1, elem2;
    
    // document.forms is an HTMLCollection
    
    elem1 = document.forms[0];
    elem2 = document.forms.item(0);
    
    alert(elem1 === elem2); // shows: "true"
    
    elem1 = document.forms["myForm"];
    elem2 = document.forms.namedItem("myForm");
    
    alert(elem1 === elem2); // shows: "true"

    Browser compatibility

    Different browsers behave differently when there are more than one elements matching the string used as an index (or namedItem's argument). Firefox 8 behaves as specified in DOM 2 and DOM4, returning the first matching element. WebKit browsers and Internet Explorer in this case return another HTMLCollection and Opera returns a NodeList of all matching elements.

    Specification

    See also

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