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jQuery text文本框限制篇幅或文本框提示字数-20130722

热度：70   发布时间：2013-08-01 15:23:18.0
jQuery text文本框限制字数或文本框提示字数-20130722
1、效果及功能说明

text文本框限制文本框字数，当text文本框内文字字数超出限制字数时，自动提示文字，已超出限制文字字数

2、实现原理

先定义好限制字数，然后获得在input里面输入的字数，在将限制的字数减去当前的数字就剩下还可以输入多少字数，在字数满了后在下面会显示出不能输入，要是还没满的话在下方就会显示还剩下多少字可以输入

主要的方法 

var limitNum = 118;
//定义参数，可输入的字数

var pattern = '还可以输入' + limitNum + '字';
//定义参数还剩多少数字可以输入

$('#wordage').html(pattern);
//wordageID还剩余多少字的ID

if(remain > 118)
//当大于限制字数时

pattern = "字数超过118个限制，短信将以多条发送！";
//显示不能输入

var result = limitNum - remain;
//否则就是显示还可以输入多少字数


3、效果图


4、运行环境

IE6 IE7 IE8及以上 Firefox 和 Google Chrome游览器下都可实现


(无图片)5、所有图片的压缩包新建一个文件后将包解压放进文件夹图片的压缩包在页面的最下方可以看到并下载下载后无需修改文件夹名因为本身就已经写好了和html5内的路径相吻合

6、将创建html文件保存的时候将编码类型换成(UTF-8有签名)这样可以让部分中文正常的显示出来，将保存类型(T)换成(所有文件(*.*))，将html5和解压后的图片文件夹放在同一个文件夹内效果


7、代码[html5] 

<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>

<body>

<style type="text/css">
*{margin:0;padding:0;list-style-type:none;}
a,img{border:0;text-decoration:none;}
/* Form */
.Form{margin:20px auto;width:600px;}
.Form textarea{
	display:inline-block;padding:6px 12px;font-size:18px;font-weight:300;line-height:1.4;color:#221919;background:#fff;border:1px solid #a4a2a2;resize:none;
	
	box-sizing:border-box;
	-moz-box-sizing:border-box;
	-ms-box-sizing:border-box;
	-webkit-box-sizing:border-box;
	
	border-radius:6px;
	-moz-border-radius:6px;
	-webkit-border-radius:6px;
	
	box-shadow:inset 0 1px rgba(34,25,25,.15),0 1px rgba(255,255,255,.8);
	-moz-box-shadow:inset 0 1px rgba(34,25,25,.15),0 1px rgba(255,255,255,.8);
	-webkit-box-shadow:inset 0 1px rgba(34,25,25,.15),0 1px rgba(255,255,255,.8);
	
	-webkit-transition:all .08s ease-in-out;
	-moz-transition:all .08s ease-in-out;
}
.Form textarea{min-height:90px;}
.Form textarea:focus{
	border-color:#006499;
	box-shadow:0 1px rgba(34, 25, 25, 0.15) inset, 0 1px rgba(255, 255, 255, 0.8), 0 0 14px rgba(82, 162, 235, 0.35);
	-moz-box-shadow:0 1px rgba(34, 25, 25, 0.15) inset, 0 1px rgba(255, 255, 255, 0.8), 0 0 14px rgba(82, 162, 235, 0.35);
	-webkit-box-shadow:0 1px rgba(34, 25, 25, 0.15) inset, 0 1px rgba(255, 255, 255, 0.8), 0 0 14px rgba(82, 162, 235, 0.35);
}
/* Button base */
.Button{
	position:relative;
	display:inline-block;
	padding:.45em .825em .45em;
	text-align:center;
	line-height:1em; 
	border:1px solid transparent;
	cursor:pointer; 
	 
	border-radius:.3em; 
	-moz-border-radius:.3em; 
	-webkit-border-radius:.3em; 
	
	-moz-transition-property:color, -moz-box-shadow, text-shadow; 
	-moz-transition-duration:.05s; 
	-moz-transition-timing-function:ease-in-out; 
	-webkit-transition-property:color, -webkit-box-shadow, text-shadow; 
	-webkit-transition-duration:.05s; 
	-webkit-transition-timing-function:ease-in-out; 
	
	box-shadow:0 1px rgba(255,255,255,0.8), inset 0 1px rgba(255,255,255,0.35); 
	-moz-box-shadow:0 1px rgba(255,255,255,0.8), inset 0 1px rgba(255,255,255,0.35); 
	-webkit-box-shadow:0 1px rgba(255,255,255,0.8), inset 0 1px rgba(255,255,255,0.35);
}

.Button:hover {text-decoration:none;}
.Button strong {position:relative; z-index:2;}

.Button{
	display:block;border:1px solid;opacity:1;
	
	border-radius:.3em;
	-moz-border-radius:.3em;
	-webkit-border-radius:.3em;
	
	box-shadow:inset 0 1px rgba(255,255,255,0.35);
	-moz-box-shadow:inset 0 1px rgba(255,255,255,0.35);
	-webkit-box-shadow:inset 0 1px rgba(255,255,255,0.35);
	
	-moz-transition-property:opacity;
	-moz-transition-duration:0.5s;
	-moz-transition-timing-function:ease-in-out;
	-webkit-transition-property:opacity;
	-webkit-transition-duration:0.5s;
	-webkit-transition-timing-function:ease-in-out;
}

.Button:hover span{
	-moz-transition-property:opacity;
	-moz-transition-duration:0.05s;
	-moz-transition-timing-function:linear;
	-webkit-transition-property:opacity;
	-webkit-transition-duration:0.05s;
	-webkit-transition-timing-function:linear;
}
.Button:active span{
	-moz-transition:none;
	-webkit-transition:none;
}

/* blue Button */
.blueButton{color:#fcf9f9; text-shadow:0 -1px rgba(34,25,25,0.5);}
.blueButton:hover {color:#fff; text-shadow:0 -1px rgba(34,25,25,0.3);}
.blueButton:active {color:#f2f0f0; text-shadow:0 -1px rgba(34,25,25,0.6);}

.blueButton{
	border-color:#015E91;
	background-color:#3693D5;
	background:-moz-linear-gradient(center top , #54B1EB, #47A0E0 50%, #419FE1 50%, #3683D5);
	background:-o-linear-gradient(top left, #54B1EB, #47A0E0 50%, #419FE1 50%, #3683D5);
	background:-webkit-gradient(linear, 0% 0%, 0% 100%, from(#54B1EB), to(#47A0E0), color-stop(.5,#419FE1),color-stop(.5,#3683D5));
	filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#54B1EB', endColorstr='#3683D5');
}

.blueButton:hover{
	border-color:#0366AD;
	background-color:#3EA1D6;
	background:-moz-linear-gradient(center top, #5EB4EA, #61A1EE 50%, #59A5EB 50%, #3691E6);
	background:-o-linear-gradient(top left, #5EB4EA, #61A1EE 50%, #59A5EB 50%, #3691E6);
	background:-webkit-gradient(linear, 0% 0%, 0% 100%, from(#5EB4EA), to(#61A1EE), color-stop(.5,#59A5EB),color-stop(.5,#3691E6));
	filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#5EB4EA', endColorstr='#3691E6');
}

.blueButton:active{
	border-color:#013B6A;
	background-color:#3089C8;
	background:-moz-linear-gradient(center top, #4B9CDD, #4189D5 50%, #3D8BD3 50%, #3093C8);
	background:-o-linear-gradient(top left, #4B9CDD, #4189D5 50%, #3D8BD3 50%, #3093C8);
	background:-webkit-gradient(linear, 0% 0%, 0% 100%, from(#4B9CDD), to(#4189D5), color-stop(.5,#3D8BD3),color-stop(.5,#3093C8));
	filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#4B9CDD', endColorstr='#3093C8');
}

.blueButton.Button18:hover{
	box-shadow:0 1px rgba(255, 255, 255, 0.8), 0 1px rgba(255, 255, 255, 0.35) inset, 0 0 10px rgba(82, 162, 235, 0.25);
	-moz-box-shadow:0 1px rgba(255, 255, 255, 0.8), 0 1px rgba(255, 255, 255, 0.35) inset, 0 0 10px rgba(82, 162, 235, 0.25);
	-webkit-box-shadow:0 1px rgba(255, 255, 255, 0.8), 0 1px rgba(255, 255, 255, 0.35) inset, 0 0 10px rgba(82, 162, 235, 0.25);
}
.blueButton.Button18:active{
	box-shadow:0 1px 2px rgba(34, 25, 25, 0.25) inset, 0 0 3px rgba(82, 202, 235, 0.35);
	-moz-box-shadow:0 1px 2px rgba(34, 25, 25, 0.25) inset, 0 0 3px rgba(82, 202, 235, 0.35);
	-webkit-box-shadow:0 1px 2px rgba(34, 25, 25, 0.25) inset, 0 0 3px rgba(82, 202, 235, 0.35);	
}
/* wordage */
#wordage{text-align:right;font-size:14px;color:#5e5e5e;margin:10px 0 0 0;}
</style>

<form name="" id="" action="" class="Form">
	<textarea id="wordtext" style="width:600px;"></textarea>
	<div id="wordage"></div>
	<a style="color:#fff;float:left;font-size:18px;" href="#" class="Button blueButton Button18"><strong>注册登录</strong></a>
</form>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript">
$(document).ready(function(){
//定义方法
	var limitNum = 118;
	//定义参数，可输入的字数
	var pattern = '还可以输入' + limitNum + '字';
	//定义参数还剩多少数字可以输入
	$('#wordage').html(pattern);
	//wordageID获得全部元素字数
	$('#wordtext').keyup(
		function(){
		//定义方法按下按键时，改变文本域的颜色
			var remain = $(this).val().length;
			//定义参数，获得当前值的长度是
			if(remain > 118){
			//当字数超过118个
				pattern = "字数超过118个限制，短信将以多条发送！";
				//显示不能在输入了
			}else{
			//否则
				var result = limitNum - remain;
				//定义参数118-去当前字数
				pattern = '还可以输入' + result + '字';
				//获得还可以输入多少字
			}
			$('#wordage').html(pattern);
			//获得所有元素还可以输入多少字
		}
	);
	 
});	
</script>	
</body>
</html>
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