JS CSSでドロップダウンリストボックスの美化を実現するeffect

JS CSSでドロップダウンリストボックスの美化を実現するeffect_javascriptスキル

WBOY

リリース： 2016-05-16 15:45:48

オリジナル

1238 人が閲覧しました

この記事の例では、JS CSS によって実現される美化されたドロップダウンリストボックスの効果について説明します。皆さんの参考に共有してください。詳細は以下の通りです。

JS CSS によって美化されたドロップダウンリストの効果は非常に優れていますが、コードが少し多すぎます。CSS を学習している友人は、その方法を学び、コードを簡素化するために自分でいくつかの変更を加えることができます。

操作効果は以下の通りです:

具体的なコードは次のとおりです:

<!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>

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この記事が皆様の JavaScript プログラミング設計に役立つことを願っています。