JavaScript通过事件代理高亮显示表格行的方法

前端技术 2023/09/08 JavaScript

本文实例讲述了JavaScript通过事件代理高亮显示表格行的方法。分享给大家供大家参考。具体实现方法如下：

<!DOCTYPE html>
<html>
<head>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />
<title>Highlight Rows</title>
<style type=\"text/css\">
 table {
 background-color: lightgreen;
 }
 #third {
 background-color: yellow;
 }
</style>
</head>
<body>
<!-- Demonstrating \"Event Delegation\" to highlight table\' rows 
 on mouseover. 
 Arguments can be passed via the delegate. 
My site:andrew.dx.am -->
<table id=\"thetable\" summary=\"highlight demo\">
 <tr><td>Just one</td><td>.. no another</td></tr>
 <tr><td>Second</td><td>.. no another</td></tr>
 <tr id=\"third\"><td>A third</td><td>.. no another</td></tr>
 <tr><td>Fourth for luck</td><td>.. no another</td></tr>
</table>
<script type=\"text/javascript\">
var addEvent = function (elem, eventType, func) {
 if ( elem.addEventListener )
 addEvent = function (elem, eventType, func) {
  elem.addEventListener(eventType, func, false);
 };
 else if ( elem.attachEvent )
 addEvent = function (elem, eventType, func) {
  elem.attachEvent(\'on\' + eventType, func);
 };
 addEvent(elem, eventType, func);
};
var delegateEvent = function (elem, childElems, eventType, func, args) {
 addEvent(elem, eventType, function (e) {
 var evt = e || window.event;
 var elem = evt.target || evt.srcElement;
 if ( elem.nodeName.toLowerCase() == childElems.toLowerCase() ) {
  func(elem, args);
 }
 });
};
function highlightRows(obj, args) {
 if (args && args.over) {
 obj.prevColour = obj.parentNode.style.backgroundColor;
 obj.parentNode.style.backgroundColor = args.colour;
 if (args.index && obj.title == \"\")
  obj.title = \"Row \" + obj.parentNode.rowIndex;
 } else {
 obj.parentNode.style.backgroundColor = \"\";
 if (obj.title.indexOf(\"Row \") + 1)
  obj.title = \"\";
 }
}
function init() {
 delegateEvent(document.getElementById(\'thetable\'), \'td\', \'mouseover\',
   highlightRows, {\'colour\': \'lightblue\', \'over\': true, 
   \'index\': true});
 delegateEvent(document.getElementById(\'thetable\'), \'td\', \'mouseout\',
   highlightRows, {\'over\': false});
}
addEvent(window, \'load\', init);
</script>
</body>
</html>

希望本文所述对大家的javascript程序设计有所帮助。

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