jQuery检测类分配的变化 [英] jquery detect change in class assignment

问题描述

有人知道使用JQuery检测给定元素的类何时已更改的方法吗?

Does anyone know a way to detect when a given element's class has changed using JQuery?

我正在使用简单计数" JQuery插件来通知用户输入文本区域的字符数.当用户超过允许的字符数时，我想禁用发布"按钮.

I'm using the "simply countable" JQuery plug-in to notify the user of the number of characters entered into a text area. When the user exceeds the allowed number of characters, I would like to disable the "post" button.

由于达到限制时，简单的可计数更改分配的CSS类，我的想法是捕获该事件，以便可以禁用发布按钮，但是也许有更好的方法吗?

Since simply countable changes the assigned CSS class when the limit is reached, my idea was to capture that event so that I could disable the post button, but perhaps there is a better way?

欢迎提出任何建议.

谢谢.

推荐答案

您的意思是这样的吗?

<script>
   $("#myTextArea").change(function(){
       var contentLength = $(this).val().length; 
       var charLimit = 500;
       if(contentLength > charLimit){
           $("#saveButton").attr("disabled","disabled");
       }

   });

</script>


<textarea id="myTextArea"></textArea>
<input type="submit" id="saveButton">

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