本文实例讲述了js实现select下拉框菜单的详细代码。分享给大家供大家参考。具体如下：
运行效果截图如下：
具体代码如下：
<!DOCTYPE html>
<html><head> <title></title> <style type="text/css"> #gridComboBox { background: #fff; border: 1px solid #2d78f4; border-radius: 2px; -moz-box-shadow: inset 0 0 4px #06c; -webkit-box-shadow: inset 0 0 4px #06c; box-shadow: inset 0 0 4px #06c; } </style></head><body> <input onclick="doClick(this,'ddd(aa/bb/cc/erererer/dfdfdfdfdfdfdfdfdfdfdfdfdf/ejjejrjerjer//erererer ////////)eee')" /> <input onclick="doClick(this,'ddd(aa/bb/cc/erererer/dfdfdfdfdfdfdfdfdfdfdfdfdf/ejjejrjerjer//erererer ////////)eee')" style='width: 300px;' /> <p><b>Needed Properties:</b> sender.offsetTop & sender.offsetLeft & sender.offsetHeight</p></body></html><script type="text/javascript">function delGridComboBox() { // 删除弹出框 var divContainer = document.getElementById('gridComboBox'); if (divContainer) { divContainer.parentNode.removeChild(divContainer); }}function doClick(sender, str) {//str='ddd(aa/bb/cc/erererer/dfdfdfdfdfdfdfdfdfdfdfdfdf/ejjejrjerjer//erererer ////////)eee' 只取()得内容/分割做为数据源 delGridComboBox(); // console.log(sender); // for(var i in sender) // { // console.log(i+"|"+sender[i]); // } var re = /[^\)\(]*/g //取出()中的内容作为下拉数据源 var fit = str.match(re); var fmt = fit[2].split('/'); var divContainer = document.createElement('div'); divContainer.style.width = sender.clientWidth + 2 + "px"; divContainer.style.overflow = "hidden"; divContainer.style.position = 'absolute'; divContainer.style.top = sender.offsetTop + sender.offsetHeight + 'px'; divContainer.style.left = sender.offsetLeft + 'px'; divContainer.style.zIndex = 999; divContainer.id = "gridComboBox"; for (var i = 0; i < fmt.length; i++) { console.log('fmt[i]>>', fmt[i]); var txt = document.createElement('div'); txt.innerHTML = fmt[i]; txt.title = txt.innerHTML; txt.style.margin = 3+'px'; txt.addEventListener('mouseover', function changeBg(event) { event.target.style.fontWeight = 'bold'; event.target.style.color = 'white'; event.target.style.backgroundColor = '#2d78f4'; }, false); txt.addEventListener('mouseout', function unChangeBg(event) { event.target.style.fontWeight = 'normal'; event.target.style.color = 'black'; event.target.style.backgroundColor = 'white'; }, false); txt.onclick = function(subSender) { sender.value = subSender.target.innerText; delGridComboBox(); }; divContainer.appendChild(txt); }; document.body.appendChild(divContainer);};</script>
如果大家还想深入学习，可以点击jquery下拉框效果汇总、JavaScript下拉框效果汇总进行学习。
以上就是js实现select下拉框菜单的代码，希望本文所述对大家学习javascript程序设计有所帮助。
