By Stuart Langridge
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In such cases, the above code keeps getting the parent node of that tag until it gets to an tag (which will be the one we want). If we find the document body—a tag—instead, we’ve gone too far. We’ll give up, returning null (nothing) from the function, and going no further. js (excerpt) return target; } The mouseover / mouseout Functions These functions work in similar ways and do very similar things: mouseover is called when we move the mouse over one of our rollover links, while mouseout is called when we move the mouse out again.
Biz What is the DOM? Essentially, the DOM provides access to the structure of an HTML page by mapping the elements in that page to a tree of nodes. Each element becomes an element node, and each bit of text becomes a text node. Take this HTML snippet, for example:
This is a paragraph, containing a link in the middle.
- This item has some emphasized text in it.
- This is another list item.
I added lots of extra indenting so that you can compare this snippet with the matching DOM tree.
Throwing Away Elements Removing an element is very similar to the process of adding one: again, we use the removeChild method on the element’s parent node.
Even after the node’s removal, sitepoint_link still constitutes a reference to that link. It still exists, it’s just not in the document any more: it’s floating in limbo. We can add it back to the document somewhere else if we want to. Set the variable to null to make the deleted element disappear forever.