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JS CSS realisiert die Fähigkeiten des verschönerten Dropdown-Listenfelds effect_javascript

WBOY
WBOYOriginal
2016-05-16 15:45:481224Durchsuche

Das Beispiel in diesem Artikel beschreibt den durch JS CSS erzielten verschönerten Dropdown-Listenfeldeffekt. Teilen Sie es als Referenz mit allen. Die Details lauten wie folgt:

Eine durch JS CSS verschönerte Dropdown-Liste. Der Effekt ist sehr gut, aber der Code ist etwas zu viel. Freunde, die CSS lernen, können die Methode lernen und dann selbst einige Änderungen vornehmen, um den Code zu vereinfachen.

Der Betriebseffekt ist wie folgt:

Der spezifische Code lautet wie folgt: 

<!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>

Ich hoffe, dass dieser Artikel für das JavaScript-Programmierdesign aller hilfreich sein wird.

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