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Tech Stuff - getElementsByTagName

W3C Reference. Part of the Document Interface.

getElementsByTagName Method

One of the three basic methods of getting a reference to a node using the DOM. Gets a reference (a NodeList aka HTMLCollection) to all the nodes which have the same HTML tag name.

Syntax

nodelist = document.getElementsByTagName(tag)

Related Stuff

getElementById

Parameters

Name Description Notes
tag any valid HTML tag, for example, 'p' or 'div'.

Examples

// get all the paragraphs in the document
listofparagraphs = document.getElementsByTagName("p");
// find the one with our special text
for(i = 0; i < listofparagraphs.length; i++)
{
  if(listofparagraphs[i].firstChild.nodeValue == "boring")
  {
    // gottcha
  }
}

The example gets a NodeList(array) Nodes with a nodeType = 1 (ELEMENT_NODE) of all the paragraph (<p>) HTML tags in our document. It then loops using the length attribute (of the NodeList) and tests the firstChild attribute (of the paragraph node) and the nodeValue attribute (of the text node) to search for a specific text string.

Notes:



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