jQuery提示示例：点击文本框弹出热门标签_表单按钮特效

基于jQuery的表单提示特效，点击文本框后会出现一些热门的标签供选择，类似于下拉框提示，了解了如何实现的这一效果，你就可很好的改变提示的内容了。模板无忧提示：如果没有出现提示框请刷新一下页面再试~

<!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>
<title>jQuery提示示例：点击文本框弹出热门标签</title>
<meta http-equiv="mrc-type" mrc="text/html;charset=gb2312">
<style type="text/css">
body {
	font-size:12px;
}
#m_tagsItem {
	background:#fff;
	position:absolute;
	top:0px;
	left:0px;
	overflow:hidden;
	width:590px;
 *width:561px;
	width:561px\9;
	padding:10px;
	border:1px solid #ccc;
	z-index:1000;
	display:none;
}
#m_tagsItem p {
	text-align:left;
	line-height:22px;
	padding:2px 0;
	margin:0;
	border:0;
}
#m_tagsItem span {
	font-weight:bold;
}
#m_tagsItem a {
	margin:0 5px;
}
.m_tagsname {
	color:#999;
	vertical-align:middle;
	font-size:12px;
	text-indent:3px;
	line-height:20px;
}
#tagClose {
	font-size:12px;
	color:#888;
	cursor:pointer;
	position:absolute;
	top:2px;
	right:2px;
}
</style>
<script src="http://p1.mb5u.com/texiao/jquery1.3.2.js"></script>
<script language="javascript">
//Copyright (c) 2006 Brandon Aaron (http://brandonaaron.net)
(function($){
$.fn.bgIframe = $.fn.bgiframe = function(s) {
	// This is only for IE6
	if ( $.browser.msie && /6.0/.test(navigator.userAgent) ) {
		s = $.extend({
			top     : 'auto', // auto == .currentStyle.borderTopWidth
			left    : 'auto', // auto == .currentStyle.borderLeftWidth
			width   : 'auto', // auto == offsetWidth
			height  : 'auto', // auto == offsetHeight
			opacity : true,
			src     : 'javascript:false;'
		}, s || {});
		var prop = function(n){return n&&n.constructor==Number?n+'px':n;},
		    html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+
		               'style="display:block;position:absolute;z-index:-1;'+
			               (s.opacity !== false?'filter:Alpha(Opacity=\'0\');':'')+
					       'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+
					       'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+
					       'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+
					       'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+
					'"/>';
		return this.each(function() {
			if ( $('> iframe.bgiframe', this).length == 0 )
				this.insertBefore( document.createElement(html), this.firstChild );
		});
	}
	return this;
};
})(jQuery);
jQuery.fn.selectCity = function(targetId) {
	var _seft = this;
	var targetId = $(targetId);
	this.click(function(){
		var A_top = $(this).offset().top + $(this).outerHeight(true);  //  1
		var A_left =  $(this).offset().left;
		targetId.bgiframe();
		targetId.show().css({"position":"absolute","top":A_top+"px" ,"left":A_left+"px"});
	});
	targetId.find("#tagClose").click(function(){
		targetId.hide();
	});
	$(document).click(function(event){
		if(event.target.id!=_seft.selector.substring(1)){
			targetId.hide();	
		}
	});
	targetId.click(function(e){
		e.stopPropagation(); //  2
	});
    return this;
}
$(function(){
	$("#selecttags").selectCity("#m_tagsItem");
});
//为文本域连续赋值
function checktag(o){
  var tagid = function(id){return document.getElementById(id);}
  var tags = [];//存放标签,避免重复加入
  var tagidSPLITCHAR = ' ';//设定分隔符,根据程序需求可改
  var d = tagid('selecttags');
  if (d.value)
    tags = d.value.split(tagidSPLITCHAR);
  var v = o.innerHTML;//如果tag有别的值或者别的非innerHTML里体现的内容
    var s = tagidSPLITCHAR+tags.join(tagidSPLITCHAR)+tagidSPLITCHAR
    if (!new RegExp(tagidSPLITCHAR+v+tagidSPLITCHAR,'g').test(s)){
      s+=v;
    }
    s = s.replace(new RegExp("(^"+tagidSPLITCHAR+"*|"+tagidSPLITCHAR+"*tagid)","g"),'');
    d.value = s;
    tags = s.split(tagidSPLITCHAR);
}
 </script>
</head>
<body>
如果没有出现提示框请刷新一下页面再试~
<input type="text" id="selecttags" name="m_tagsname" class="m_tagsname" style="width:577px" value="点击查看热门标签和您曾经使用过的标签" onClick="if(this.value=='点击查看热门标签和您曾经使用过的标签'){this.value='';this.className='m_tagsname'}">
<div id="m_tagsItem" style="display:none">
  <div id="tagClose">关闭</div>
  <p><span>温馨提示：</span>标签间请用“空格”、“逗号”或“分号”隔开，用简练的词语概括您的博文内容。</p>
  <p><span>热门标签：</span><a href="javascript:void(0)" onClick="checktag(this)">彩妆</a><a href="javascript:void(0)" onClick="checktag(this)">美发</a><a href="javascript:void(0)" onClick="checktag(this)">美优博客</a><a href="javascript:void(0)" onClick="checktag(this)">aaa</a><a href="javascript:void(0)" onClick="checktag(this)">bbb</a><a href="javascript:void(0)" onClick="checktag(this)">模板无忧</a><a href="javascript:void(0)" onClick="checktag(this)">mb5u.com</a><a href="javascript:void(0)" onClick="checktag(this)">eee</a><a href="javascript:void(0)" onClick="checktag(this)">fff</a><a href="javascript:void(0)" onClick="checktag(this)">ggg</a></p>
  <p><span>您使用过的标签：</span><a href="javascript:void(0)" onClick="checktag(this)">软件</a><a href="javascript:void(0)" onClick="checktag(this)">Delphi</a><a href="javascript:void(0)" onClick="checktag(this)">博客</a><a href="javascript:void(0)" onClick="checktag(this)">源码</a><a href="javascript:void(0)" onClick="checktag(this)">彩妆</a><a href="javascript:void(0)" onClick="checktag(this)">google</a><a href="javascript:void(0)" onClick="checktag(this)">新浪</a></p>
</div>
</body>
</html>

所属频道：表单按钮特效/更新时间：2012-11-23

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