recursively looks at node n and its descendants: replacing with their uppercase equivalents : DOM Content « Development « JavaScript DHTML

recursively looks at node n and its descendants: replacing with their uppercase equivalents

Examples From
JavaScript: The Definitive Guide, Fourth Edition

Legal matters: these files were created by David Flanagan, and are
Copyright (c) 2001 by David Flanagan.  You may use, study, modify, and
distribute them for any purpose.  Please note that these examples are
provided "as-is" and come with no warranty of any kind.

David Flanagan

// This function recursively looks at node n and its descendants, 
// replacing all Text nodes with their uppercase equivalents.
function uppercase(n) {
    if (n.nodeType == 3 /*Node.TEXT_NODE*/) {
        // If the node is a Text node, create a new Text node that
        // holds the uppercase version of the node's text, and use the
        // replaceChild() method of the parent node to replace the
        // original node with the new uppercase node.
        var newNode = document.createTextNode(;
        var parent = n.parentNode;
        parent.replaceChild(newNode, n);
    else {
        // If the node was not a Text node, loop through its children,
        // and recursively call this function on each child.
        var kids = n.childNodes;
        for(var i = 0; i < kids.length; i++) uppercase(kids[i]);

<!-- Here is some sample text.  Note that the p tags have id attributes -->
<p id="p1">This <i>is</i> paragraph 1.</p>
<p id="p2">This <i>is</i> paragraph 2.</p>

<!-- Here is a button that invokes the uppercase() function defined above -->
<!-- Note the call to Document.getElementById() to find the desired node -->
<button onclick="uppercase(document.getElementById('p1'));">Click Me</button> 


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