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JS CSS merealisasikan kemahiran effect_javascript kotak senarai drop-down yang dipercantik

WBOY
WBOYasal
2016-05-16 15:45:481226semak imbas

Contoh dalam artikel ini menerangkan kesan kotak senarai lungsur tercantik yang dicapai oleh JS CSS. Kongsikan dengan semua orang untuk rujukan anda. Butirannya adalah seperti berikut:

Senarai lungsur yang dicantikkan oleh JS CSS, kesannya sangat bagus, tetapi kodnya terlalu banyak Rakan yang mempelajari CSS boleh mempelajari kaedah tersebut, dan kemudian membuat beberapa perubahan sendiri untuk memudahkan kod.

Kesan operasi adalah seperti yang ditunjukkan di bawah:

Kod khusus adalah seperti berikut: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JS+CSS下拉列表</title>
<style type="text/css">
body{
 font-size:12px; margin:0
}
.center{ margin-left:auto; margin-right:auto; margin-top:200px; width:300px;}
#age_sel_2 div.tag_select{display:block;color:#000;width:62px;height:22px;background:transparent url("http://files.jb51.net/file_images/article/201508/2015811145849095.gif") no-repeat 0 0;padding:0 10px;line-height:22px;}
#age_sel_2 div.tag_select_hover{display:block;color:#000;width:62px;height:22px;background:transparent url("http://files.jb51.net/file_images/article/201508/2015811145849095.gif") no-repeat 0 -22px;padding:0 10px;line-height:22px;}
#age_sel_2 div.tag_select_open{display:block;color:#000;width:62px;height:22px;background:transparent url("http://files.jb51.net/file_images/article/201508/2015811145849095.gif") no-repeat 0 -44px;padding:0 10px;line-height:22px;}
#age_sel_2 ul.tag_options{position:absolute;margin:0;list-style:none;background:transparent url("http://files.jb51.net/file_images/article/201508/2015811145849095.gif") no-repeat left bottom;padding:0 0 1px;margin:0;width:60px;}
#age_sel_2 ul.tag_options li{background:transparent url("http://files.jb51.net/file_images/article/201508/2015811145849095.gif") repeat-y -102px 0;display:block;width:61px;padding:0 10px;height:22px;text-decoration:none;line-height:22px;color:#000;}
#age_sel_2 ul.tag_options li.open_hover{background:transparent url("http://files.jb51.net/file_images/article/201508/2015811145849095.gif") no-repeat 0 -88px;color:#000}
#age_sel_2 ul.tag_options li.open_selected{background:transparent url("http://files.jb51.net/file_images/article/201508/2015811145849095.gif") no-repeat 0 -66px;color:#19555F}
</style>
<script>
var selects = document.getElementsByTagName('select');
var isIE = (document.all && window.ActiveXObject && !window.opera) &#63; true : false;
function $(id) {
 return document.getElementById(id);
}
function stopBubbling (ev) { 
 ev.stopPropagation();
}
function rSelects() {
 for (i=0;i<selects.length;i++){
 selects[i].style.display = 'none';
 select_tag = document.createElement('div');
  select_tag.id = 'select_' + selects[i].name;
  select_tag.className = 'select_box';
 selects[i].parentNode.insertBefore(select_tag,selects[i]);
 select_info = document.createElement('div'); 
  select_info.id = 'select_info_' + selects[i].name;
  select_info.className='tag_select';
  select_info.style.cursor='pointer';
 select_tag.appendChild(select_info);
 select_ul = document.createElement('ul'); 
  select_ul.id = 'options_' + selects[i].name;
  select_ul.className = 'tag_options';
  select_ul.style.position='absolute';
  select_ul.style.display='none';
  select_ul.style.zIndex='999';
 select_tag.appendChild(select_ul);
 rOptions(i,selects[i].name);
 mouseSelects(selects[i].name);
 if (isIE){
  selects[i].onclick = new Function("clickLabels3('"+selects[i].name+"');window.event.cancelBubble = true;");
 }
 else if(!isIE){
  selects[i].onclick = new Function("clickLabels3('"+selects[i].name+"')");
  selects[i].addEventListener("click", stopBubbling, false);
 } 
 }
}
function rOptions(i, name) {
 var options = selects[i].getElementsByTagName('option');
 var options_ul = 'options_' + name;
 for (n=0;n<selects[i].options.length;n++){ 
 option_li = document.createElement('li');
  option_li.style.cursor='pointer';
  option_li.className='open';
 $(options_ul).appendChild(option_li);
 option_text = document.createTextNode(selects[i].options[n].text);
 option_li.appendChild(option_text);
 option_selected = selects[i].options[n].selected;
 if(option_selected){
  option_li.className='open_selected';
  option_li.id='selected_' + name;
  $('select_info_' + name).appendChild(document.createTextNode(option_li.innerHTML));
 }
 option_li.onmouseover = function(){ this.className='open_hover';}
 option_li.onmouseout = function(){
  if(this.id=='selected_' + name){
  this.className='open_selected';
  }
  else {
  this.className='open';
  }
 } 
 option_li.onclick = new Function("clickOptions("+i+","+n+",'"+selects[i].name+"')");
 }
}
function mouseSelects(name){
 var sincn = 'select_info_' + name;
 $(sincn).onmouseover = function(){ if(this.className=='tag_select') this.className='tag_select_hover'; }
 $(sincn).onmouseout = function(){ if(this.className=='tag_select_hover') this.className='tag_select'; }
 if (isIE){
 $(sincn).onclick = new Function("clickSelects('"+name+"');window.event.cancelBubble = true;");
 }
 else if(!isIE){
 $(sincn).onclick = new Function("clickSelects('"+name+"');");
 $('select_info_' +name).addEventListener("click", stopBubbling, false);
 }
}
function clickSelects(name){
 var sincn = 'select_info_' + name;
 var sinul = 'options_' + name; 
 for (i=0;i<selects.length;i++){ 
 if(selects[i].name == name){  
  if( $(sincn).className =='tag_select_hover'){
  $(sincn).className ='tag_select_open';
  $(sinul).style.display = '';
  }
  else if( $(sincn).className =='tag_select_open'){
  $(sincn).className = 'tag_select_hover';
  $(sinul).style.display = 'none';
  }
 }
 else{
  $('select_info_' + selects[i].name).className = 'tag_select';
  $('options_' + selects[i].name).style.display = 'none';
 }
 }
}
function clickOptions(i, n, name){ 
 var li = $('options_' + name).getElementsByTagName('li');
 $('selected_' + name).className='open';
 $('selected_' + name).id='';
 li[n].id='selected_' + name;
 li[n].className='open_hover';
 $('select_' + name).removeChild($('select_info_' + name));
 select_info = document.createElement('div');
 select_info.id = 'select_info_' + name;
 select_info.className='tag_select';
 select_info.style.cursor='pointer';
 $('options_' + name).parentNode.insertBefore(select_info,$('options_' + name));
 mouseSelects(name);
 $('select_info_' + name).appendChild(document.createTextNode(li[n].innerHTML));
 $( 'options_' + name ).style.display = 'none' ;
 $( 'select_info_' + name ).className = 'tag_select';
 selects[i].options[n].selected = 'selected';
}
window.onload = function(e) {
 bodyclick = document.getElementsByTagName('body').item(0);
 rSelects();
 bodyclick.onclick = function(){
 for (i=0;i<selects.length;i++){ 
  $('select_info_' + selects[i].name).className = 'tag_select';
  $('options_' + selects[i].name).style.display = 'none';
 }
 }
}</script>
</head>
<body>
<div class="center">
<div id="age_sel_2">
 <select name="area_selet2" id="area_select2">
  <option value="请选择">请选择</option>
  <option value="ASP" >ASP</option>
  <option value="PHP" >PHP</option>
  <option value=".NET" >.NET</option>
  <option value="Csharp" >Csharp</option>
  <option value="Delphi" >Delphi</option>
  <option value="Java" >Java</option>
 </select>
</div>
</div>
</body>
</html>

Saya harap artikel ini akan membantu reka bentuk pengaturcaraan JavaScript semua orang.

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