Practice Set, Week 8, DOM Traversal

by russduza

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++) {
        traverse(el.childNodes[i], str)
        
        
    if ( el.childNodes[i].nodeType == 3) {
    	var nList = el.childNodes[i];
      nList = nList.textContent;
      var sList = nList.toString();
      		var n = sList.search("text")
          	if (n > 0) {
            
      el.childNodes[i].parentNode.className = "searchHit";
            }
   		 }
    }
    
}

traverse(document.documentElement, 'text');