Javascript: getting element in dom tree when mouseover

dom, html, javascript, mouseover

Solution

Which HTML element is the target of the event? (on Quirksmode.org, by Peter-Paul Koch). Also have a look at the `target` attribute of the Event object in W3C DOM Level 2 Event Model.

<!DOCTYPE html>
<html>
  <head>
    <title>target test</title>
    <style>
      *        { border: 1px solid #fff }
      .trigger { background: lightgreen }
    </style>
  </head>
  <body>
    <p class="trigger">Trigger testCase().</p>
    <p class="trigger">Trigger testCase().</p>
    <p class="trigger">Trigger testCase().</p>
    <p id="display"></p>
    <script>
var lastelem;

document.onmouseover = function (e) {
        var event = e || window.event;

        if (lastelem) {
                lastelem.style.border = "1px solid #fff";
        }

        var target = event.target || event.srcElement;
        document.getElementById('display').innerHTML = target.previousSibling.tagName +
            " | " + target.tagName + " | " + (target.nextSibling ? target.nextSibling.tagName : "X");
        target.style.border = "1px solid";
        lastelem = target;
};
    </script>
  </body>
</html>

Problem

When using : ``` document.onmouseover = function(e) {} ``` Is there a property which gives me the element in the dom tree ? For example, I can set a style to `e.srcElement` But, how can I later access this element to (for example) reset its style ? And how can I know at which place in the dom tree it is ? I want to be able to situate it in the whole page dump. Many thanks. To solve the problem about reaccessing the element later, I tried this but it doesn't work : ``` var lastelem; document.onmouseover = function(e) { if (lastelem != null){ lastelem.style.border = "0px"; } if (e===undefined) e= window.event; var target= 'target' in event? event.target : event.srcElement; document.getElementById('display').value = target.tagName; target.style.border = "1px"; lastelem = target; }; ``` Thanks

Original source