JavaScript通过事件代理高亮显示表格行的方法

2019-11-20 12:24:11

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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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