jQuery模仿twitter和微博textarea输入字数统计插件

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引入JS
- 3.0.0 2.2.0 2.1.4 2.1.3 2.1.2 2.1.1 2.1.0 2.0.3 2.0.2 2.0.1 2.0.0 1.12.0 1.11.3 1.11.2 1.11.1 1.11.0 1.10.2 1.10.1 1.10.0 1.9.1 1.9.0 1.8.3 1.8.2 1.8.1 1.8.0 1.7.2 1.7.1 1.7 1.6.4 1.6.2 1.6.1 1.4.4 1.4.3 1.4.2 1.4.1 1.4.0
- 1.7.3 1.7.2 1.7.1.0 1.7.0.0
- 2.0.0-beta.0 2.0.0-alpha.55 1.5.0-rc.0 1.4.8 1.4.0 1.3.20 1.2.29 1.1.5 1.0.8
- 1.8.3 1.7.0 1.6.0 1.5.2 1.4.4 1.3.3 1.2.4 1.1.7
- 1.10.4 1.9.7 1.8.10 1.7.8 1.6.3 1.5.4 1.4.6 1.3.3
- core1.6.0 core-compat1.6.0 core1.5.2 core-compat1.5.2 core-full-compat-yc1.4.5 core-full-compat1.4.5 core-full-nocompat-yc1.4.5 core-full-nocompat1.4.5
- 1.4.2 1.4.1 1.4.0 1.3.0 1.2.0 1.1.0
- 3.7.3 3.7.2 3.7.1 3.7.0 3.7 3.6.2 3.6.1 3.6

引入框架
- 1.4.5 1.4.4 1.4.3 1.4.2 1.4.1 1.4.0 1.3.2
- 1.11.4 1.11.3 1.11.2 1.11.1 1.11.0 1.10.4 1.10.3 1.10.2
- 3.3.6 3.3.5 3.3.0 3.2.0 2.3.2

汉王

HTML代码

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<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>模仿twitter和新浪微博的textarea字数统计jQuery插件charCount</title>
<script type="text/javascript" src="//apps.bdimg.com/libs/jquery/1.11.3/jquery.min.js"></script>
<script type="text/javascript">
(function($) {

$.fn.charCount = function(options){
		var defaults = {	
			allowed: 140,		
			warning: 25,
			css: 'counter',
			counterElement: 'span',
			cssWarning: 'warning',
			cssExceeded: 'exceeded',
			counterText: ''
		}; 
			
		var options = $.extend(defaults, options); 
		
		function calculate(obj){
			var count = $(obj).val().length;
			var available = options.allowed - count;
			if(available <= options.warning && available >= 0){
				$(obj).next().addClass(options.cssWarning);
			} else {
				$(obj).next().removeClass(options.cssWarning);
			}
			if(available < 0){
				$(obj).next().addClass(options.cssExceeded);
			} else {
				$(obj).next().removeClass(options.cssExceeded);
			}
			$(obj).next().html(options.counterText + available);
		};
				
		this.each(function() {  			
			$(this).after('<'+ options.counterElement +' class="' + options.css + '">'+ options.counterText +'</'+ options.counterElement +'>');
			calculate(this);
			$(this).keyup(function(){calculate(this)});
			$(this).change(function(){calculate(this)});
		});
	  
	};

})(jQuery);

</script>
<script type="text/javascript">
	$(document).ready(function(){	
		//default usage
		$("#message1").charCount();
		//custom usage
		$("#message2").charCount({
			allowed: 50,		
			warning: 20,
			counterText: 'Characters left: '	
		});
	});
</script>

</style>
</head>
<body>

<h1>jQuery plugin: Simplest Twitter-like dynamic character count for textareas and input fields</h1>
    
	<p>Test the plugin by typing into fields below.</p>
    <form id="form" method="post" action="">

<h2>Default Usage</h2>
        <div>
        	<label for="message">Type your message</label>
        	<textarea id="message1" name="message1"></textarea>
        </div>

<h2>Custom Usage</h2>
    	<div>
        	<label for="message">Another message (limited to 50, warning at 20)</label>
            <textarea id="message2" name="message2"></textarea>
        </div>	
    </form>
<p><a href="http://cssglobe.com/post/7161/jquery-plugin-simplest-twitterlike-dynamic-character-count-for-textareas" title="read more about this plugin">back to the article</a></p>
<p><strong>Character Count plugin</strong> is brought to you by <a href="http://cssglobe.com" title="web standards magazine and css news">Css Globe</a>, <a href="http://easyframework.com">Easy front-end framework</a> and supported by <a href="http://templatica.com">Css Templates</a> by Templatica<br />
</p>
</body>
</html>

​x
 
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>模仿twitter和新浪微博的textarea字数统计jQuery插件charCount</title>
<script type="text/javascript" src="//apps.bdimg.com/libs/jquery/1.11.3/jquery.min.js"></script>
<script type="text/javascript">
(function($) {
​
    $.fn.charCount = function(options){
        var defaults = {    
            allowed: 140,       
            warning: 25,
            css: 'counter',
            counterElement: 'span',
            cssWarning: 'warning',

CSS代码

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CSS代码...xxxxxxxxxx
 
​

JS代码

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JS代码...xxxxxxxxxx
 
​

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简介

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名称

jQuery模仿twitter和微博textarea输入字数统计插件

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描述

charCount——jQuery模仿twitter和微博textarea输入字数统计插件，可适时显示剩余字符数量，让用户心中有数，本效果可有效提升用户体验，微博网站大多都有此功能。