js实现select下拉框菜单

2019-11-20 11:04:13

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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。

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