Practice Set, Week 8, DOM Traversal

by jhu26

HTML

<h3>Practice Set, Week 8, DOM Traversal</h3>

<p>Code is provided here that will traverse the DOM. Your job is to add some code that will take some action at each node.</p>
<p>Your task is to find every element that has the word "text" in it, and add the className "searchHit" to their parent elements.</p>
<p>The steps to do this will look something like this:</p>
<ol>
    <li>At each node, determine if it's a text node</li>
    <li>If so, find out if the target string is within the text content of the node.</li>
    <li>If so, get the parent node and set its class attribute to "searchHit"</li>
</ol>
<p>If you've got it, each element containing the word 'text' will be highlighted in yellow. </p>

CSS

.searchHit {
    background-color:yellow;
}

JavaScript

function traverse(el, str) {
			// Your code can go here - acting on the way down 
			//   the tree towards the branches
	
			for (var i = 0; i < el.childNodes.length; i++){
				var currentNode = el.childNodes[i];
			    for(var x = 0; x < currentNode.childNodes.length; x++){
	    			var currentChildNode = currentNode.childNodes[x];
					if(currentChildNode.nodeType == 3){
						alert("The node name: " + currentChildNode.nodeName);
						alert("The node value: " + currentChildNode.nodeValue); //i don't know why this keeps showing up blank. 
						alert("The node type: " + currentChildNode.nodeType);
					}
			    }
			}
		}

		traverse(document.documentElement, 'text');